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Posted to commits@nifi.apache.org by al...@apache.org on 2017/02/22 20:52:09 UTC
[14/51] [partial] nifi-minifi-cpp git commit: MINIFI-183 Added civet
1.9.1 sources Added onScheduled hook Added initial two-way TLS-enabled
ListenHTTP implementation
http://git-wip-us.apache.org/repos/asf/nifi-minifi-cpp/blob/a9485aeb/thirdparty/civetweb-1.9.1/src/third_party/duktape-1.5.2/src-separate/duk_bi_buffer.c
----------------------------------------------------------------------
diff --git a/thirdparty/civetweb-1.9.1/src/third_party/duktape-1.5.2/src-separate/duk_bi_buffer.c b/thirdparty/civetweb-1.9.1/src/third_party/duktape-1.5.2/src-separate/duk_bi_buffer.c
new file mode 100644
index 0000000..0d8efb0
--- /dev/null
+++ b/thirdparty/civetweb-1.9.1/src/third_party/duktape-1.5.2/src-separate/duk_bi_buffer.c
@@ -0,0 +1,2882 @@
+/*
+ * Duktape.Buffer, Node.js Buffer, and Khronos/ES6 TypedArray built-ins
+ */
+
+#include "duk_internal.h"
+
+/*
+ * Misc helpers
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Map DUK_HBUFFEROBJECT_ELEM_xxx to duk_hobject class number.
+ * Sync with duk_hbufferobject.h and duk_hobject.h.
+ */
+static const duk_uint8_t duk__buffer_class_from_elemtype[9] = {
+ DUK_HOBJECT_CLASS_UINT8ARRAY,
+ DUK_HOBJECT_CLASS_UINT8CLAMPEDARRAY,
+ DUK_HOBJECT_CLASS_INT8ARRAY,
+ DUK_HOBJECT_CLASS_UINT16ARRAY,
+ DUK_HOBJECT_CLASS_INT16ARRAY,
+ DUK_HOBJECT_CLASS_UINT32ARRAY,
+ DUK_HOBJECT_CLASS_INT32ARRAY,
+ DUK_HOBJECT_CLASS_FLOAT32ARRAY,
+ DUK_HOBJECT_CLASS_FLOAT64ARRAY
+};
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Map DUK_HBUFFEROBJECT_ELEM_xxx to prototype object built-in index.
+ * Sync with duk_hbufferobject.h.
+ */
+static const duk_uint8_t duk__buffer_proto_from_elemtype[9] = {
+ DUK_BIDX_UINT8ARRAY_PROTOTYPE,
+ DUK_BIDX_UINT8CLAMPEDARRAY_PROTOTYPE,
+ DUK_BIDX_INT8ARRAY_PROTOTYPE,
+ DUK_BIDX_UINT16ARRAY_PROTOTYPE,
+ DUK_BIDX_INT16ARRAY_PROTOTYPE,
+ DUK_BIDX_UINT32ARRAY_PROTOTYPE,
+ DUK_BIDX_INT32ARRAY_PROTOTYPE,
+ DUK_BIDX_FLOAT32ARRAY_PROTOTYPE,
+ DUK_BIDX_FLOAT64ARRAY_PROTOTYPE
+};
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Map DUK__FLX_xxx to byte size.
+ */
+static const duk_uint8_t duk__buffer_nbytes_from_fldtype[6] = {
+ 1, /* DUK__FLD_8BIT */
+ 2, /* DUK__FLD_16BIT */
+ 4, /* DUK__FLD_32BIT */
+ 4, /* DUK__FLD_FLOAT */
+ 8, /* DUK__FLD_DOUBLE */
+ 0 /* DUK__FLD_VARINT; not relevant here */
+};
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Bitfield for each DUK_HBUFFEROBJECT_ELEM_xxx indicating which element types
+ * are compatible with a blind byte copy for the TypedArray set() method (also
+ * used for TypedArray constructor). Array index is target buffer elem type,
+ * bitfield indicates compatible source types. The types must have same byte
+ * size and they must be coercion compatible.
+ */
+static duk_uint16_t duk__buffer_elemtype_copy_compatible[9] = {
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_UINT8 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT8) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT8CLAMPED) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_INT8),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_UINT8CLAMPED
+ * Note: INT8 is -not- copy compatible, e.g. -1 would coerce to 0x00.
+ */
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT8) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT8CLAMPED),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_INT8 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT8) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT8CLAMPED) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_INT8),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_UINT16 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT16) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_INT16),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_INT16 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT16) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_INT16),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_UINT32 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT32) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_INT32),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_INT32 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_UINT32) |
+ (1U << DUK_HBUFFEROBJECT_ELEM_INT32),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_FLOAT32 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_FLOAT32),
+
+ /* xxx -> DUK_HBUFFEROBJECT_ELEM_FLOAT64 */
+ (1U << DUK_HBUFFEROBJECT_ELEM_FLOAT64)
+};
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Shared helper. */
+DUK_LOCAL duk_hbufferobject *duk__getrequire_bufobj_this(duk_context *ctx, duk_bool_t throw_flag) {
+ duk_hthread *thr;
+ duk_tval *tv;
+ duk_hbufferobject *h_this;
+
+ DUK_ASSERT(ctx != NULL);
+ thr = (duk_hthread *) ctx;
+
+ tv = duk_get_borrowed_this_tval(ctx);
+ DUK_ASSERT(tv != NULL);
+ if (DUK_TVAL_IS_OBJECT(tv)) {
+ h_this = (duk_hbufferobject *) DUK_TVAL_GET_OBJECT(tv);
+ DUK_ASSERT(h_this != NULL);
+ if (DUK_HOBJECT_IS_BUFFEROBJECT((duk_hobject *) h_this)) {
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_this);
+ return h_this;
+ }
+ }
+
+ if (throw_flag) {
+ DUK_ERROR_TYPE(thr, DUK_STR_NOT_BUFFER);
+ }
+ return NULL;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Check that 'this' is a duk_hbufferobject and return a pointer to it. */
+DUK_LOCAL duk_hbufferobject *duk__get_bufobj_this(duk_context *ctx) {
+ return duk__getrequire_bufobj_this(ctx, 0);
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Check that 'this' is a duk_hbufferobject and return a pointer to it
+ * (NULL if not).
+ */
+DUK_LOCAL duk_hbufferobject *duk__require_bufobj_this(duk_context *ctx) {
+ return duk__getrequire_bufobj_this(ctx, 1);
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Check that value is a duk_hbufferobject and return a pointer to it. */
+DUK_LOCAL duk_hbufferobject *duk__require_bufobj_value(duk_context *ctx, duk_idx_t index) {
+ duk_hthread *thr;
+ duk_tval *tv;
+ duk_hbufferobject *h_obj;
+
+ thr = (duk_hthread *) ctx;
+
+ /* Don't accept relative indices now. */
+ DUK_ASSERT(index >= 0);
+
+ tv = duk_require_tval(ctx, index);
+ DUK_ASSERT(tv != NULL);
+ if (DUK_TVAL_IS_OBJECT(tv)) {
+ h_obj = (duk_hbufferobject *) DUK_TVAL_GET_OBJECT(tv);
+ DUK_ASSERT(h_obj != NULL);
+ if (DUK_HOBJECT_IS_BUFFEROBJECT((duk_hobject *) h_obj)) {
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_obj);
+ return h_obj;
+ }
+ }
+
+ DUK_ERROR_TYPE(thr, DUK_STR_NOT_BUFFER);
+ return NULL; /* not reachable */
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+DUK_LOCAL void duk__set_bufobj_buffer(duk_context *ctx, duk_hbufferobject *h_bufobj, duk_hbuffer *h_val) {
+ duk_hthread *thr;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ DUK_ASSERT(ctx != NULL);
+ DUK_ASSERT(h_bufobj != NULL);
+ DUK_ASSERT(h_bufobj->buf == NULL); /* no need to decref */
+ DUK_ASSERT(h_val != NULL);
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+
+ h_bufobj->buf = h_val;
+ DUK_HBUFFER_INCREF(thr, h_val);
+ h_bufobj->length = (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_val);
+ DUK_ASSERT(h_bufobj->shift == 0);
+ DUK_ASSERT(h_bufobj->elem_type == DUK_HBUFFEROBJECT_ELEM_UINT8);
+
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+}
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_LOCAL duk_hbufferobject *duk__push_arraybuffer_with_length(duk_context *ctx, duk_uint_t len) {
+ duk_hbuffer *h_val;
+ duk_hbufferobject *h_bufobj;
+
+ (void) duk_push_fixed_buffer(ctx, (duk_size_t) len);
+ h_val = (duk_hbuffer *) duk_get_hbuffer(ctx, -1);
+ DUK_ASSERT(h_val != NULL);
+
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARRAYBUFFER),
+ DUK_BIDX_ARRAYBUFFER_PROTOTYPE);
+ DUK_ASSERT(h_bufobj != NULL);
+
+ duk__set_bufobj_buffer(ctx, h_bufobj, h_val);
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+
+ return h_bufobj;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Shared offset/length coercion helper. */
+DUK_LOCAL void duk__resolve_offset_opt_length(duk_context *ctx,
+ duk_hbufferobject *h_bufarg,
+ duk_idx_t idx_offset,
+ duk_idx_t idx_length,
+ duk_uint_t *out_offset,
+ duk_uint_t *out_length,
+ duk_bool_t throw_flag) {
+ duk_hthread *thr;
+ duk_int_t offset_signed;
+ duk_int_t length_signed;
+ duk_uint_t offset;
+ duk_uint_t length;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ offset_signed = duk_to_int(ctx, idx_offset);
+ if (offset_signed < 0) {
+ goto fail_range;
+ }
+ offset = (duk_uint_t) offset_signed;
+ if (offset > h_bufarg->length) {
+ goto fail_range;
+ }
+ DUK_ASSERT_DISABLE(offset >= 0); /* unsigned */
+ DUK_ASSERT(offset <= h_bufarg->length);
+
+ if (duk_is_undefined(ctx, idx_length)) {
+ DUK_ASSERT(h_bufarg->length >= offset);
+ length = h_bufarg->length - offset; /* >= 0 */
+ } else {
+ length_signed = duk_to_int(ctx, idx_length);
+ if (length_signed < 0) {
+ goto fail_range;
+ }
+ length = (duk_uint_t) length_signed;
+ DUK_ASSERT(h_bufarg->length >= offset);
+ if (length > h_bufarg->length - offset) {
+ /* Unlike for negative arguments, some call sites
+ * want length to be clamped if it's positive.
+ */
+ if (throw_flag) {
+ goto fail_range;
+ } else {
+ length = h_bufarg->length - offset;
+ }
+ }
+ }
+ DUK_ASSERT_DISABLE(length >= 0); /* unsigned */
+ DUK_ASSERT(offset + length <= h_bufarg->length);
+
+ *out_offset = offset;
+ *out_length = length;
+ return;
+
+ fail_range:
+ DUK_ERROR_RANGE(thr, DUK_STR_INVALID_CALL_ARGS);
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Shared lenient buffer length clamping helper. No negative indices, no
+ * element/byte shifting.
+ */
+DUK_LOCAL void duk__clamp_startend_nonegidx_noshift(duk_context *ctx,
+ duk_hbufferobject *h_bufobj,
+ duk_idx_t idx_start,
+ duk_idx_t idx_end,
+ duk_int_t *out_start_offset,
+ duk_int_t *out_end_offset) {
+ duk_int_t buffer_length;
+ duk_int_t start_offset;
+ duk_int_t end_offset;
+
+ DUK_ASSERT(out_start_offset != NULL);
+ DUK_ASSERT(out_end_offset != NULL);
+
+ buffer_length = (duk_int_t) h_bufobj->length;
+
+ /* undefined coerces to zero which is correct */
+ start_offset = duk_to_int_clamped(ctx, idx_start, 0, buffer_length);
+ if (duk_is_undefined(ctx, idx_end)) {
+ end_offset = buffer_length;
+ } else {
+ end_offset = duk_to_int_clamped(ctx, idx_end, start_offset, buffer_length);
+ }
+
+ DUK_ASSERT(start_offset >= 0);
+ DUK_ASSERT(start_offset <= buffer_length);
+ DUK_ASSERT(end_offset >= 0);
+ DUK_ASSERT(end_offset <= buffer_length);
+ DUK_ASSERT(start_offset <= end_offset);
+
+ *out_start_offset = start_offset;
+ *out_end_offset = end_offset;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Shared lenient buffer length clamping helper. Indices are treated as
+ * element indices (though output values are byte offsets) which only
+ * really matters for TypedArray views as other buffer object have a zero
+ * shift. Negative indices are counted from end of input slice; crossed
+ * indices are clamped to zero length; and final indices are clamped
+ * against input slice. Used for e.g. ArrayBuffer slice().
+ */
+DUK_LOCAL void duk__clamp_startend_negidx_shifted(duk_context *ctx,
+ duk_hbufferobject *h_bufobj,
+ duk_idx_t idx_start,
+ duk_idx_t idx_end,
+ duk_int_t *out_start_offset,
+ duk_int_t *out_end_offset) {
+ duk_int_t buffer_length;
+ duk_int_t start_offset;
+ duk_int_t end_offset;
+
+ DUK_ASSERT(out_start_offset != NULL);
+ DUK_ASSERT(out_end_offset != NULL);
+
+ buffer_length = (duk_int_t) h_bufobj->length;
+ buffer_length >>= h_bufobj->shift; /* as elements */
+
+ /* Resolve start/end offset as element indices first; arguments
+ * at idx_start/idx_end are element offsets. Working with element
+ * indices first also avoids potential for wrapping.
+ */
+
+ start_offset = duk_to_int(ctx, idx_start);
+ if (start_offset < 0) {
+ start_offset = buffer_length + start_offset;
+ }
+ if (duk_is_undefined(ctx, idx_end)) {
+ end_offset = buffer_length;
+ } else {
+ end_offset = duk_to_int(ctx, idx_end);
+ if (end_offset < 0) {
+ end_offset = buffer_length + end_offset;
+ }
+ }
+ /* Note: start_offset/end_offset can still be < 0 here. */
+
+ if (start_offset < 0) {
+ start_offset = 0;
+ } else if (start_offset > buffer_length) {
+ start_offset = buffer_length;
+ }
+ if (end_offset < start_offset) {
+ end_offset = start_offset;
+ } else if (end_offset > buffer_length) {
+ end_offset = buffer_length;
+ }
+ DUK_ASSERT(start_offset >= 0);
+ DUK_ASSERT(start_offset <= buffer_length);
+ DUK_ASSERT(end_offset >= 0);
+ DUK_ASSERT(end_offset <= buffer_length);
+ DUK_ASSERT(start_offset <= end_offset);
+
+ /* Convert indices to byte offsets. */
+ start_offset <<= h_bufobj->shift;
+ end_offset <<= h_bufobj->shift;
+
+ *out_start_offset = start_offset;
+ *out_end_offset = end_offset;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Indexed read/write helpers (also used from outside this file)
+ */
+
+DUK_INTERNAL void duk_hbufferobject_push_validated_read(duk_context *ctx, duk_hbufferobject *h_bufobj, duk_uint8_t *p, duk_small_uint_t elem_size) {
+ duk_double_union du;
+
+ DUK_MEMCPY((void *) du.uc, (const void *) p, (size_t) elem_size);
+
+ switch (h_bufobj->elem_type) {
+ case DUK_HBUFFEROBJECT_ELEM_UINT8:
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+ case DUK_HBUFFEROBJECT_ELEM_UINT8CLAMPED:
+#endif
+ duk_push_uint(ctx, (duk_uint_t) du.uc[0]);
+ break;
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+ /* These are not needed when only Duktape.Buffer is supported. */
+ case DUK_HBUFFEROBJECT_ELEM_INT8:
+ duk_push_int(ctx, (duk_int_t) (duk_int8_t) du.uc[0]);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_UINT16:
+ duk_push_uint(ctx, (duk_uint_t) du.us[0]);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_INT16:
+ duk_push_int(ctx, (duk_int_t) (duk_int16_t) du.us[0]);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_UINT32:
+ duk_push_uint(ctx, (duk_uint_t) du.ui[0]);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_INT32:
+ duk_push_int(ctx, (duk_int_t) (duk_int32_t) du.ui[0]);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_FLOAT32:
+ duk_push_number(ctx, (duk_double_t) du.f[0]);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_FLOAT64:
+ duk_push_number(ctx, (duk_double_t) du.d);
+ break;
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+ default:
+ DUK_UNREACHABLE();
+ }
+}
+
+DUK_INTERNAL void duk_hbufferobject_validated_write(duk_context *ctx, duk_hbufferobject *h_bufobj, duk_uint8_t *p, duk_small_uint_t elem_size) {
+ duk_double_union du;
+
+ /* NOTE! Caller must ensure that any side effects from the
+ * coercions below are safe. If that cannot be guaranteed
+ * (which is normally the case), caller must coerce the
+ * argument using duk_to_number() before any pointer
+ * validations; the result of duk_to_number() always coerces
+ * without side effects here.
+ */
+
+ switch (h_bufobj->elem_type) {
+ case DUK_HBUFFEROBJECT_ELEM_UINT8:
+ du.uc[0] = (duk_uint8_t) duk_to_uint32(ctx, -1);
+ break;
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+ /* These are not needed when only Duktape.Buffer is supported. */
+ case DUK_HBUFFEROBJECT_ELEM_UINT8CLAMPED:
+ du.uc[0] = (duk_uint8_t) duk_to_uint8clamped(ctx, -1);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_INT8:
+ du.uc[0] = (duk_uint8_t) duk_to_int32(ctx, -1);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_UINT16:
+ du.us[0] = (duk_uint16_t) duk_to_uint32(ctx, -1);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_INT16:
+ du.us[0] = (duk_uint16_t) duk_to_int32(ctx, -1);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_UINT32:
+ du.ui[0] = (duk_uint32_t) duk_to_uint32(ctx, -1);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_INT32:
+ du.ui[0] = (duk_uint32_t) duk_to_int32(ctx, -1);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_FLOAT32:
+ du.f[0] = (duk_float_t) duk_to_number(ctx, -1);
+ break;
+ case DUK_HBUFFEROBJECT_ELEM_FLOAT64:
+ du.d = (duk_double_t) duk_to_number(ctx, -1);
+ break;
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+ default:
+ DUK_UNREACHABLE();
+ }
+
+ DUK_MEMCPY((void *) p, (const void *) du.uc, (size_t) elem_size);
+}
+
+/*
+ * Duktape.Buffer: constructor
+ */
+
+DUK_INTERNAL duk_ret_t duk_bi_buffer_constructor(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_size_t buf_size;
+ duk_small_int_t buf_dynamic;
+ duk_uint8_t *buf_data;
+ const duk_uint8_t *src_data;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ /*
+ * Constructor arguments are currently somewhat compatible with
+ * (keep it that way if possible):
+ *
+ * http://nodejs.org/api/buffer.html
+ *
+ * Note that the ToBuffer() coercion (duk_to_buffer()) does NOT match
+ * the constructor behavior.
+ */
+
+ buf_dynamic = duk_get_boolean(ctx, 1); /* default to false */
+
+ switch (duk_get_type(ctx, 0)) {
+ case DUK_TYPE_NUMBER: {
+ /* new buffer of specified size */
+ buf_size = (duk_size_t) duk_to_int(ctx, 0);
+ (void) duk_push_buffer(ctx, buf_size, buf_dynamic);
+ break;
+ }
+ case DUK_TYPE_BUFFER: {
+ /* return input buffer, converted to a Duktape.Buffer object
+ * if called as a constructor (no change if called as a
+ * function).
+ */
+ duk_set_top(ctx, 1);
+ break;
+ }
+ case DUK_TYPE_STRING: {
+ /* new buffer with string contents */
+ src_data = (const duk_uint8_t *) duk_get_lstring(ctx, 0, &buf_size);
+ DUK_ASSERT(src_data != NULL); /* even for zero-length string */
+ buf_data = (duk_uint8_t *) duk_push_buffer(ctx, buf_size, buf_dynamic);
+ DUK_MEMCPY((void *) buf_data, (const void *) src_data, (size_t) buf_size);
+ break;
+ }
+ case DUK_TYPE_OBJECT: {
+ /* For all duk_hbufferobjects, get the plain buffer inside
+ * without making a copy. This is compatible with Duktape 1.2
+ * but means that a slice/view information is ignored and the
+ * full underlying buffer is returned.
+ *
+ * If called as a constructor, a new Duktape.Buffer object
+ * pointing to the same plain buffer is created below.
+ */
+ duk_hbufferobject *h_bufobj;
+ h_bufobj = (duk_hbufferobject *) duk_get_hobject(ctx, 0);
+ DUK_ASSERT(h_bufobj != NULL);
+ if (!DUK_HOBJECT_IS_BUFFEROBJECT((duk_hobject *) h_bufobj)) {
+ return DUK_RET_TYPE_ERROR;
+ }
+ if (h_bufobj->buf == NULL) {
+ return DUK_RET_TYPE_ERROR;
+ }
+ duk_push_hbuffer(ctx, h_bufobj->buf);
+ break;
+ }
+ case DUK_TYPE_NONE:
+ default: {
+ return DUK_RET_TYPE_ERROR;
+ }
+ }
+ DUK_ASSERT(duk_is_buffer(ctx, -1));
+
+ /* stack is unbalanced, but: [ <something> buf ] */
+
+ if (duk_is_constructor_call(ctx)) {
+ duk_hbufferobject *h_bufobj;
+ duk_hbuffer *h_val;
+
+ h_val = duk_get_hbuffer(ctx, -1);
+ DUK_ASSERT(h_val != NULL);
+
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_BUFFER),
+ DUK_BIDX_BUFFER_PROTOTYPE);
+ DUK_ASSERT(h_bufobj != NULL);
+
+ duk__set_bufobj_buffer(ctx, h_bufobj, h_val);
+
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+ }
+ /* Note: unbalanced stack on purpose */
+
+ return 1;
+}
+
+/*
+ * Node.js Buffer: constructor
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_constructor(duk_context *ctx) {
+ /* Internal class is Object: Object.prototype.toString.call(new Buffer(0))
+ * prints "[object Object]".
+ */
+ duk_int_t len;
+ duk_int_t i;
+ duk_hbuffer *h_buf;
+ duk_hbufferobject *h_bufobj;
+ duk_size_t buf_size;
+
+ switch (duk_get_type(ctx, 0)) {
+ case DUK_TYPE_BUFFER: {
+ /* Custom behavior: plain buffer is used as internal buffer
+ * without making a copy (matches Duktape.Buffer).
+ */
+ duk_set_top(ctx, 1); /* -> [ buffer ] */
+ break;
+ }
+ case DUK_TYPE_NUMBER: {
+ len = duk_to_int_clamped(ctx, 0, 0, DUK_INT_MAX);
+ (void) duk_push_fixed_buffer(ctx, (duk_size_t) len);
+ break;
+ }
+ case DUK_TYPE_OBJECT: {
+ duk_uint8_t *buf;
+
+ (void) duk_get_prop_string(ctx, 0, "length");
+ len = duk_to_int_clamped(ctx, -1, 0, DUK_INT_MAX);
+ duk_pop(ctx);
+ buf = (duk_uint8_t *) duk_push_fixed_buffer(ctx, (duk_size_t) len);
+ for (i = 0; i < len; i++) {
+ /* XXX: fast path for array arguments? */
+ duk_get_prop_index(ctx, 0, (duk_uarridx_t) i);
+ buf[i] = (duk_uint8_t) (duk_to_uint32(ctx, -1) & 0xffU);
+ duk_pop(ctx);
+ }
+ break;
+ }
+ case DUK_TYPE_STRING: {
+ /* ignore encoding for now */
+ duk_dup(ctx, 0);
+ (void) duk_to_buffer(ctx, -1, &buf_size);
+ break;
+ }
+ default:
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ DUK_ASSERT(duk_is_buffer(ctx, -1));
+ h_buf = duk_get_hbuffer(ctx, -1);
+ DUK_ASSERT(h_buf != NULL);
+
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_BUFFER),
+ DUK_BIDX_NODEJS_BUFFER_PROTOTYPE);
+ DUK_ASSERT(h_bufobj != NULL);
+
+ h_bufobj->buf = h_buf;
+ DUK_HBUFFER_INCREF(thr, h_buf);
+ DUK_ASSERT(h_bufobj->offset == 0);
+ h_bufobj->length = (duk_int_t) DUK_HBUFFER_GET_SIZE(h_buf);
+ DUK_ASSERT(h_bufobj->elem_type == DUK_HBUFFEROBJECT_ELEM_UINT8);
+
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_constructor(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * ArrayBuffer, DataView, and TypedArray constructors
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_arraybuffer_constructor(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hbufferobject *h_bufobj;
+ duk_hbuffer *h_val;
+
+ DUK_ASSERT_CTX_VALID(ctx);
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ /* XXX: function flag to make this automatic? */
+ if (!duk_is_constructor_call(ctx)) {
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ if (duk_is_buffer(ctx, 0)) {
+ /* Custom behavior: plain buffer is used as internal buffer
+ * without making a copy (matches Duktape.Buffer).
+ */
+
+ h_val = duk_get_hbuffer(ctx, 0);
+ DUK_ASSERT(h_val != NULL);
+
+ /* XXX: accept any duk_hbufferobject type as an input also? */
+ } else {
+ duk_int_t len;
+ len = duk_to_int(ctx, 0);
+ if (len < 0) {
+ goto fail_length;
+ }
+ (void) duk_push_fixed_buffer(ctx, (duk_size_t) len);
+ h_val = (duk_hbuffer *) duk_get_hbuffer(ctx, -1);
+ DUK_ASSERT(h_val != NULL);
+
+#if !defined(DUK_USE_ZERO_BUFFER_DATA)
+ /* Khronos/ES6 requires zeroing even when DUK_USE_ZERO_BUFFER_DATA
+ * is not set.
+ */
+ DUK_ASSERT(!DUK_HBUFFER_HAS_DYNAMIC((duk_hbuffer *) h_val));
+ DUK_MEMZERO((void *) DUK_HBUFFER_FIXED_GET_DATA_PTR(thr->heap, h_val), (duk_size_t) len);
+#endif
+ }
+
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_ARRAYBUFFER),
+ DUK_BIDX_ARRAYBUFFER_PROTOTYPE);
+ DUK_ASSERT(h_bufobj != NULL);
+
+ duk__set_bufobj_buffer(ctx, h_bufobj, h_val);
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+
+ return 1;
+
+ fail_length:
+ return DUK_RET_RANGE_ERROR;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_arraybuffer_constructor(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+
+/* Format of magic, bits:
+ * 0...1: elem size shift (0-3)
+ * 2...5: elem type (DUK_HBUFFEROBJECT_ELEM_xxx)
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_typedarray_constructor(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_tval *tv;
+ duk_hobject *h_obj;
+ duk_hbufferobject *h_bufobj = NULL;
+ duk_hbufferobject *h_bufarr = NULL;
+ duk_hbufferobject *h_bufarg = NULL;
+ duk_hbuffer *h_val;
+ duk_small_uint_t magic;
+ duk_small_uint_t shift;
+ duk_small_uint_t elem_type;
+ duk_small_uint_t elem_size;
+ duk_small_uint_t class_num;
+ duk_small_uint_t proto_bidx;
+ duk_uint_t align_mask;
+ duk_uint_t elem_length;
+ duk_int_t elem_length_signed;
+ duk_uint_t byte_length;
+ duk_small_uint_t copy_mode;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ /* XXX: function flag to make this automatic? */
+ if (!duk_is_constructor_call(ctx)) {
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ /* We could fit built-in index into magic but that'd make the magic
+ * number dependent on built-in numbering (genbuiltins.py doesn't
+ * handle that yet). So map both class and prototype from the
+ * element type.
+ */
+ magic = duk_get_current_magic(ctx);
+ shift = magic & 0x03; /* bits 0...1: shift */
+ elem_type = (magic >> 2) & 0x0f; /* bits 2...5: type */
+ elem_size = 1 << shift;
+ align_mask = elem_size - 1;
+ DUK_ASSERT(elem_type < sizeof(duk__buffer_proto_from_elemtype) / sizeof(duk_uint8_t));
+ proto_bidx = duk__buffer_proto_from_elemtype[elem_type];
+ DUK_ASSERT(proto_bidx < DUK_NUM_BUILTINS);
+ DUK_ASSERT(elem_type < sizeof(duk__buffer_class_from_elemtype) / sizeof(duk_uint8_t));
+ class_num = duk__buffer_class_from_elemtype[elem_type];
+
+ DUK_DD(DUK_DDPRINT("typedarray constructor, magic=%d, shift=%d, elem_type=%d, "
+ "elem_size=%d, proto_bidx=%d, class_num=%d",
+ (int) magic, (int) shift, (int) elem_type, (int) elem_size,
+ (int) proto_bidx, (int) class_num));
+
+ /* Argument variants. When the argument is an ArrayBuffer a view to
+ * the same buffer is created; otherwise a new ArrayBuffer is always
+ * created.
+ */
+
+ tv = duk_get_tval(ctx, 0);
+ DUK_ASSERT(tv != NULL); /* arg count */
+ if (DUK_TVAL_IS_OBJECT(tv)) {
+ h_obj = DUK_TVAL_GET_OBJECT(tv);
+ DUK_ASSERT(h_obj != NULL);
+
+ if (DUK_HOBJECT_GET_CLASS_NUMBER(h_obj) == DUK_HOBJECT_CLASS_ARRAYBUFFER) {
+ /* ArrayBuffer: unlike any other argument variant, create
+ * a view into the existing buffer.
+ */
+
+ duk_int_t byte_offset_signed;
+ duk_uint_t byte_offset;
+
+ h_bufarg = (duk_hbufferobject *) h_obj;
+
+ byte_offset_signed = duk_to_int(ctx, 1);
+ if (byte_offset_signed < 0) {
+ goto fail_arguments;
+ }
+ byte_offset = (duk_uint_t) byte_offset_signed;
+ if (byte_offset > h_bufarg->length ||
+ (byte_offset & align_mask) != 0) {
+ /* Must be >= 0 and multiple of element size. */
+ goto fail_arguments;
+ }
+ if (duk_is_undefined(ctx, 2)) {
+ DUK_ASSERT(h_bufarg->length >= byte_offset);
+ byte_length = h_bufarg->length - byte_offset;
+ if ((byte_length & align_mask) != 0) {
+ /* Must be element size multiple from
+ * start offset to end of buffer.
+ */
+ goto fail_arguments;
+ }
+ elem_length = (byte_length >> shift);
+ } else {
+ elem_length_signed = duk_to_int(ctx, 2);
+ if (elem_length_signed < 0) {
+ goto fail_arguments;
+ }
+ elem_length = (duk_uint_t) elem_length_signed;
+ byte_length = elem_length << shift;
+ if ((byte_length >> shift) != elem_length) {
+ /* Byte length would overflow. */
+ /* XXX: easier check with less code? */
+ goto fail_arguments;
+ }
+ DUK_ASSERT(h_bufarg->length >= byte_offset);
+ if (byte_length > h_bufarg->length - byte_offset) {
+ /* Not enough data. */
+ goto fail_arguments;
+ }
+ }
+ DUK_UNREF(elem_length);
+ DUK_ASSERT_DISABLE(byte_offset >= 0);
+ DUK_ASSERT(byte_offset <= h_bufarg->length);
+ DUK_ASSERT_DISABLE(byte_length >= 0);
+ DUK_ASSERT(byte_offset + byte_length <= h_bufarg->length);
+ DUK_ASSERT((elem_length << shift) == byte_length);
+
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(class_num),
+ proto_bidx);
+ h_val = h_bufarg->buf;
+ if (h_val == NULL) {
+ return DUK_RET_TYPE_ERROR;
+ }
+ h_bufobj->buf = h_val;
+ DUK_HBUFFER_INCREF(thr, h_val);
+ h_bufobj->offset = h_bufarg->offset + byte_offset;
+ h_bufobj->length = byte_length;
+ h_bufobj->shift = (duk_uint8_t) shift;
+ h_bufobj->elem_type = (duk_uint8_t) elem_type;
+ h_bufobj->is_view = 1;
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+
+ /* Set .buffer to the argument ArrayBuffer. */
+ duk_dup(ctx, 0);
+ duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_LC_BUFFER, DUK_PROPDESC_FLAGS_NONE);
+ duk_compact(ctx, -1);
+ return 1;
+ } else if (DUK_HOBJECT_IS_BUFFEROBJECT(h_obj)) {
+ /* TypedArray (or other non-ArrayBuffer duk_hbufferobject).
+ * Conceptually same behavior as for an Array-like argument,
+ * with a few fast paths.
+ */
+
+ h_bufarg = (duk_hbufferobject *) h_obj;
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufarg);
+ elem_length_signed = (duk_int_t) (h_bufarg->length >> h_bufarg->shift);
+ if (h_bufarg->buf == NULL) {
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ /* Select copy mode. Must take into account element
+ * compatibility and validity of the underlying source
+ * buffer.
+ */
+
+ DUK_DDD(DUK_DDDPRINT("selecting copy mode for bufobj arg, "
+ "src byte_length=%ld, src shift=%d, "
+ "src/dst elem_length=%ld; "
+ "dst shift=%d -> dst byte_length=%ld",
+ (long) h_bufarg->length, (int) h_bufarg->shift,
+ (long) elem_length_signed, (int) shift,
+ (long) (elem_length_signed << shift)));
+
+ copy_mode = 2; /* default is explicit index read/write copy */
+ DUK_ASSERT(elem_type < sizeof(duk__buffer_elemtype_copy_compatible) / sizeof(duk_uint16_t));
+ if (DUK_HBUFFEROBJECT_VALID_SLICE(h_bufarg)) {
+ if ((duk__buffer_elemtype_copy_compatible[elem_type] & (1 << h_bufarg->elem_type)) != 0) {
+ DUK_DDD(DUK_DDDPRINT("source/target are copy compatible, memcpy"));
+ DUK_ASSERT(shift == h_bufarg->shift); /* byte sizes will match */
+ copy_mode = 0;
+ } else {
+ DUK_DDD(DUK_DDDPRINT("source/target not copy compatible but valid, fast copy"));
+ copy_mode = 1;
+ }
+ }
+ } else {
+ /* Array or Array-like */
+ elem_length_signed = (duk_int_t) duk_get_length(ctx, 0);
+ copy_mode = 2;
+ }
+ } else if (DUK_TVAL_IS_BUFFER(tv)) {
+ /* Accept plain buffer values like array initializers
+ * (new in Duktape 1.4.0).
+ */
+ duk_hbuffer *h_srcbuf;
+ h_srcbuf = DUK_TVAL_GET_BUFFER(tv);
+ elem_length_signed = (duk_int_t) DUK_HBUFFER_GET_SIZE(h_srcbuf);
+ copy_mode = 2; /* XXX: could add fast path for u8 compatible views */
+ } else {
+ /* Non-object argument is simply int coerced, matches
+ * V8 behavior (except for "null", which we coerce to
+ * 0 but V8 TypeErrors).
+ */
+ elem_length_signed = duk_to_int(ctx, 0);
+ copy_mode = 3;
+ }
+ if (elem_length_signed < 0) {
+ goto fail_arguments;
+ }
+ elem_length = (duk_uint_t) elem_length_signed;
+ byte_length = (duk_uint_t) (elem_length << shift);
+ if ((byte_length >> shift) != elem_length) {
+ /* Byte length would overflow. */
+ /* XXX: easier check with less code? */
+ goto fail_arguments;
+ }
+
+ DUK_DDD(DUK_DDDPRINT("elem_length=%ld, byte_length=%ld",
+ (long) elem_length, (long) byte_length));
+
+ /* ArrayBuffer argument is handled specially above; the rest of the
+ * argument variants are handled by shared code below.
+ */
+
+ /* Push a new ArrayBuffer (becomes view .buffer) */
+ h_bufarr = duk__push_arraybuffer_with_length(ctx, byte_length);
+ DUK_ASSERT(h_bufarr != NULL);
+ h_val = h_bufarr->buf;
+ DUK_ASSERT(h_val != NULL);
+
+ /* Push the resulting view object and attach the ArrayBuffer. */
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(class_num),
+ proto_bidx);
+
+ h_bufobj->buf = h_val;
+ DUK_HBUFFER_INCREF(thr, h_val);
+ DUK_ASSERT(h_bufobj->offset == 0);
+ h_bufobj->length = byte_length;
+ h_bufobj->shift = (duk_uint8_t) shift;
+ h_bufobj->elem_type = (duk_uint8_t) elem_type;
+ h_bufobj->is_view = 1;
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+
+ /* Set .buffer */
+ duk_dup(ctx, -2);
+ duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_LC_BUFFER, DUK_PROPDESC_FLAGS_NONE);
+ duk_compact(ctx, -1);
+
+ /* Copy values, the copy method depends on the arguments.
+ *
+ * Copy mode decision may depend on the validity of the underlying
+ * buffer of the source argument; there must be no harmful side effects
+ * from there to here for copy_mode to still be valid.
+ */
+ DUK_DDD(DUK_DDDPRINT("copy mode: %d", (int) copy_mode));
+ switch (copy_mode) {
+ case 0: {
+ /* Use byte copy. */
+
+ duk_uint8_t *p_src;
+ duk_uint8_t *p_dst;
+
+ DUK_ASSERT(h_bufobj != NULL);
+ DUK_ASSERT(h_bufobj->buf != NULL);
+ DUK_ASSERT(DUK_HBUFFEROBJECT_VALID_SLICE(h_bufobj));
+ DUK_ASSERT(h_bufarg != NULL);
+ DUK_ASSERT(h_bufarg->buf != NULL);
+ DUK_ASSERT(DUK_HBUFFEROBJECT_VALID_SLICE(h_bufarg));
+
+ p_dst = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_bufobj);
+ p_src = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_bufarg);
+
+ DUK_DDD(DUK_DDDPRINT("using memcpy: p_src=%p, p_dst=%p, byte_length=%ld",
+ (void *) p_src, (void *) p_dst, (long) byte_length));
+
+ DUK_MEMCPY((void *) p_dst, (const void *) p_src, (size_t) byte_length);
+ break;
+ }
+ case 1: {
+ /* Copy values through direct validated reads and writes. */
+
+ duk_small_uint_t src_elem_size;
+ duk_small_uint_t dst_elem_size;
+ duk_uint8_t *p_src;
+ duk_uint8_t *p_src_end;
+ duk_uint8_t *p_dst;
+
+ DUK_ASSERT(h_bufobj != NULL);
+ DUK_ASSERT(h_bufobj->buf != NULL);
+ DUK_ASSERT(DUK_HBUFFEROBJECT_VALID_SLICE(h_bufobj));
+ DUK_ASSERT(h_bufarg != NULL);
+ DUK_ASSERT(h_bufarg->buf != NULL);
+ DUK_ASSERT(DUK_HBUFFEROBJECT_VALID_SLICE(h_bufarg));
+
+ src_elem_size = 1 << h_bufarg->shift;
+ dst_elem_size = elem_size;
+
+ p_src = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_bufarg);
+ p_dst = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_bufobj);
+ p_src_end = p_src + h_bufarg->length;
+
+ DUK_DDD(DUK_DDDPRINT("using fast copy: p_src=%p, p_src_end=%p, p_dst=%p, "
+ "src_elem_size=%d, dst_elem_size=%d",
+ (void *) p_src, (void *) p_src_end, (void *) p_dst,
+ (int) src_elem_size, (int) dst_elem_size));
+
+ while (p_src != p_src_end) {
+ DUK_DDD(DUK_DDDPRINT("fast path per element copy loop: "
+ "p_src=%p, p_src_end=%p, p_dst=%p",
+ (void *) p_src, (void *) p_src_end, (void *) p_dst));
+ /* A validated read() is always a number, so it's write coercion
+ * is always side effect free an won't invalidate pointers etc.
+ */
+ duk_hbufferobject_push_validated_read(ctx, h_bufarg, p_src, src_elem_size);
+ duk_hbufferobject_validated_write(ctx, h_bufobj, p_dst, dst_elem_size);
+ duk_pop(ctx);
+ p_src += src_elem_size;
+ p_dst += dst_elem_size;
+ }
+ break;
+ }
+ case 2: {
+ /* Copy values by index reads and writes. Let virtual
+ * property handling take care of coercion.
+ */
+ duk_uint_t i;
+
+ DUK_DDD(DUK_DDDPRINT("using slow copy"));
+
+ for (i = 0; i < elem_length; i++) {
+ duk_get_prop_index(ctx, 0, (duk_uarridx_t) i);
+ duk_put_prop_index(ctx, -2, (duk_uarridx_t) i);
+ }
+ break;
+ }
+ default:
+ case 3: {
+ /* No copy, leave zero bytes in the buffer. There's no
+ * ambiguity with Float32/Float64 because zero bytes also
+ * represent 0.0.
+ */
+#if !defined(DUK_USE_ZERO_BUFFER_DATA)
+ /* Khronos/ES6 requires zeroing even when DUK_USE_ZERO_BUFFER_DATA
+ * is not set.
+ */
+ DUK_ASSERT(!DUK_HBUFFER_HAS_DYNAMIC((duk_hbuffer *) h_val));
+ DUK_MEMZERO((void *) DUK_HBUFFER_FIXED_GET_DATA_PTR(thr->heap, h_val), (duk_size_t) byte_length);
+#endif
+
+ DUK_DDD(DUK_DDDPRINT("using no copy"));
+ break;
+ }
+ }
+
+ return 1;
+
+ fail_arguments:
+ return DUK_RET_RANGE_ERROR;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_typedarray_constructor(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_dataview_constructor(duk_context *ctx) {
+ duk_hbufferobject *h_bufarg;
+ duk_hbufferobject *h_bufobj;
+ duk_hbuffer *h_val;
+ duk_uint_t offset;
+ duk_uint_t length;
+
+ /* XXX: function flag to make this automatic? */
+ if (!duk_is_constructor_call(ctx)) {
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ h_bufarg = duk__require_bufobj_value(ctx, 0);
+ DUK_ASSERT(h_bufarg != NULL);
+
+ duk__resolve_offset_opt_length(ctx, h_bufarg, 1, 2, &offset, &length, 1 /*throw_flag*/);
+ DUK_ASSERT(offset <= h_bufarg->length);
+ DUK_ASSERT(offset + length <= h_bufarg->length);
+
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_DATAVIEW),
+ DUK_BIDX_DATAVIEW_PROTOTYPE);
+
+ h_val = h_bufarg->buf;
+ if (h_val == NULL) {
+ return DUK_RET_TYPE_ERROR;
+ }
+ h_bufobj->buf = h_val;
+ DUK_HBUFFER_INCREF(thr, h_val);
+ h_bufobj->offset = h_bufarg->offset + offset;
+ h_bufobj->length = length;
+ DUK_ASSERT(h_bufobj->shift == 0);
+ DUK_ASSERT(h_bufobj->elem_type == DUK_HBUFFEROBJECT_ELEM_UINT8);
+ h_bufobj->is_view = 1;
+
+ /* The DataView .buffer property is ordinarily set to the argument
+ * which is an ArrayBuffer. We accept any duk_hbufferobject as
+ * an argument and .buffer will be set to the argument regardless
+ * of what it is. This may be a bit confusing if the argument
+ * is e.g. a DataView or another TypedArray view.
+ *
+ * XXX: Copy .buffer property from a DataView/TypedArray argument?
+ * Create a fresh ArrayBuffer for Duktape.Buffer and Node.js Buffer
+ * arguments? See: test-bug-dataview-buffer-prop.js.
+ */
+
+ duk_dup(ctx, 0);
+ duk_xdef_prop_stridx(ctx, -2, DUK_STRIDX_LC_BUFFER, DUK_PROPDESC_FLAGS_NONE);
+ duk_compact(ctx, -1);
+
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_dataview_constructor(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * ArrayBuffer.isView()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_arraybuffer_isview(duk_context *ctx) {
+ duk_hobject *h_obj;
+ duk_bool_t ret = 0;
+
+ h_obj = duk_get_hobject(ctx, 0);
+ if (h_obj != NULL && DUK_HOBJECT_IS_BUFFEROBJECT(h_obj)) {
+ ret = ((duk_hbufferobject *) h_obj)->is_view;
+ }
+ duk_push_boolean(ctx, ret);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_arraybuffer_isview(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer: toString([encoding], [start], [end])
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_tostring(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hbufferobject *h_this;
+ duk_int_t start_offset, end_offset;
+ duk_uint8_t *buf_slice;
+ duk_size_t slice_length;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ h_this = duk__get_bufobj_this(ctx);
+ if (h_this == NULL) {
+ /* XXX: happens e.g. when evaluating: String(Buffer.prototype). */
+ duk_push_string(ctx, "[object Object]");
+ return 1;
+ }
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_this);
+
+ /* ignore encoding for now */
+
+ duk__clamp_startend_nonegidx_noshift(ctx, h_this, 1 /*idx_start*/, 2 /*idx_end*/, &start_offset, &end_offset);
+
+ slice_length = (duk_size_t) (end_offset - start_offset);
+ buf_slice = (duk_uint8_t *) duk_push_fixed_buffer(ctx, slice_length);
+ DUK_ASSERT(buf_slice != NULL);
+
+ if (h_this->buf == NULL) {
+ goto type_error;
+ }
+
+ if (DUK_HBUFFEROBJECT_VALID_BYTEOFFSET_EXCL(h_this, start_offset + slice_length)) {
+ DUK_MEMCPY((void *) buf_slice,
+ (const void *) (DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this) + start_offset),
+ (size_t) slice_length);
+ } else {
+ /* not covered, return all zeroes */
+ ;
+ }
+
+ duk_to_string(ctx, -1);
+ return 1;
+
+ type_error:
+ return DUK_RET_TYPE_ERROR;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_tostring(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Duktape.Buffer: toString(), valueOf()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_buffer_prototype_tostring_shared(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_tval *tv;
+ duk_small_int_t to_string = duk_get_current_magic(ctx);
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ tv = duk_get_borrowed_this_tval(ctx);
+ DUK_ASSERT(tv != NULL);
+
+ if (DUK_TVAL_IS_BUFFER(tv)) {
+ duk_hbuffer *h_buf;
+ h_buf = DUK_TVAL_GET_BUFFER(tv);
+ DUK_ASSERT(h_buf != NULL);
+ duk_push_hbuffer(ctx, h_buf);
+ } else if (DUK_TVAL_IS_OBJECT(tv)) {
+ duk_hobject *h;
+ duk_hbufferobject *h_bufobj;
+
+ /* Accept any duk_hbufferobject, though we're only normally
+ * called for Duktape.Buffer values.
+ */
+ h = DUK_TVAL_GET_OBJECT(tv);
+ DUK_ASSERT(h != NULL);
+ if (!DUK_HOBJECT_IS_BUFFEROBJECT(h)) {
+ DUK_DD(DUK_DDPRINT("toString/valueOf() called for a non-bufferobject object"));
+ goto type_error;
+ }
+ h_bufobj = (duk_hbufferobject *) h;
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+
+ if (h_bufobj->buf == NULL) {
+ DUK_DD(DUK_DDPRINT("toString/valueOf() called for a bufferobject with NULL buf"));
+ goto type_error;
+ }
+ duk_push_hbuffer(ctx, h_bufobj->buf);
+ } else {
+ goto type_error;
+ }
+
+ if (to_string) {
+ duk_to_string(ctx, -1);
+ }
+ return 1;
+
+ type_error:
+ return DUK_RET_TYPE_ERROR;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_buffer_prototype_tostring_shared(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.prototype: toJSON()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_tojson(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hbufferobject *h_this;
+ duk_uint8_t *buf;
+ duk_uint_t i;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+ h_this = duk__require_bufobj_this(ctx);
+ DUK_ASSERT(h_this != NULL);
+
+ if (h_this->buf == NULL || !DUK_HBUFFEROBJECT_VALID_SLICE(h_this)) {
+ /* Serialize uncovered backing buffer as a null; doesn't
+ * really matter as long we're memory safe.
+ */
+ duk_push_null(ctx);
+ return 1;
+ }
+
+ duk_push_object(ctx);
+ duk_push_hstring_stridx(ctx, DUK_STRIDX_UC_BUFFER);
+ duk_put_prop_stridx(ctx, -2, DUK_STRIDX_TYPE);
+
+ duk_push_array(ctx);
+ for (i = 0; i < h_this->length; i++) {
+ /* XXX: regetting the pointer may be overkill - we're writing
+ * to a side-effect free array here.
+ */
+ DUK_ASSERT(h_this->buf != NULL);
+ buf = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this);
+ duk_push_uint(ctx, (duk_uint_t) buf[i]);
+ duk_put_prop_index(ctx, -2, (duk_idx_t) i);
+ }
+ duk_put_prop_stridx(ctx, -2, DUK_STRIDX_DATA);
+
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_tojson(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.prototype.equals()
+ * Node.js Buffer.prototype.compare()
+ * Node.js Buffer.compare()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_buffer_compare_shared(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_small_uint_t magic;
+ duk_hbufferobject *h_bufarg1;
+ duk_hbufferobject *h_bufarg2;
+ duk_small_int_t comp_res;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ magic = duk_get_current_magic(ctx);
+ if (magic & 0x02) {
+ /* Static call style. */
+ h_bufarg1 = duk__require_bufobj_value(ctx, 0);
+ h_bufarg2 = duk__require_bufobj_value(ctx, 1);
+ } else {
+ h_bufarg1 = duk__require_bufobj_this(ctx);
+ h_bufarg2 = duk__require_bufobj_value(ctx, 0);
+ }
+ DUK_ASSERT(h_bufarg1 != NULL);
+ DUK_ASSERT(h_bufarg2 != NULL);
+
+ /* We want to compare the slice/view areas of the arguments.
+ * If either slice/view is invalid (underlying buffer is shorter)
+ * ensure equals() is false, but otherwise the only thing that
+ * matters is to be memory safe.
+ */
+
+ if (DUK_HBUFFEROBJECT_VALID_SLICE(h_bufarg1) &&
+ DUK_HBUFFEROBJECT_VALID_SLICE(h_bufarg2)) {
+ comp_res = duk_js_data_compare((const duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufarg1->buf) + h_bufarg1->offset,
+ (const duk_uint8_t *) DUK_HBUFFER_GET_DATA_PTR(thr->heap, h_bufarg2->buf) + h_bufarg2->offset,
+ (duk_size_t) h_bufarg1->length,
+ (duk_size_t) h_bufarg2->length);
+ } else {
+ comp_res = -1; /* either nonzero value is ok */
+ }
+
+ if (magic & 0x01) {
+ /* compare: similar to string comparison but for buffer data. */
+ duk_push_int(ctx, comp_res);
+ } else {
+ /* equals */
+ duk_push_boolean(ctx, (comp_res == 0));
+ }
+
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_buffer_compare_shared(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.prototype.fill()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_fill(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hbufferobject *h_this;
+ const duk_uint8_t *fill_str_ptr;
+ duk_size_t fill_str_len;
+ duk_uint8_t fill_value;
+ duk_int_t fill_offset;
+ duk_int_t fill_end;
+ duk_size_t fill_length;
+ duk_uint8_t *p;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ h_this = duk__require_bufobj_this(ctx);
+ DUK_ASSERT(h_this != NULL);
+ if (h_this->buf == NULL) {
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ /* [ value offset end ] */
+
+ if (duk_is_string(ctx, 0)) {
+ fill_str_ptr = (const duk_uint8_t *) duk_get_lstring(ctx, 0, &fill_str_len);
+ DUK_ASSERT(fill_str_ptr != NULL);
+ } else {
+ fill_value = (duk_uint8_t) duk_to_uint32(ctx, 0);
+ fill_str_ptr = (const duk_uint8_t *) &fill_value;
+ fill_str_len = 1;
+ }
+
+ /* Fill offset handling is more lenient than in Node.js. */
+
+ duk__clamp_startend_nonegidx_noshift(ctx, h_this, 1 /*idx_start*/, 2 /*idx_end*/, &fill_offset, &fill_end);
+
+ DUK_DDD(DUK_DDDPRINT("fill: fill_value=%02x, fill_offset=%ld, fill_end=%ld, view length=%ld",
+ (unsigned int) fill_value, (long) fill_offset, (long) fill_end, (long) h_this->length));
+
+ DUK_ASSERT(fill_end - fill_offset >= 0);
+ DUK_ASSERT(h_this->buf != NULL);
+
+ p = (DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this) + fill_offset);
+ fill_length = (duk_size_t) (fill_end - fill_offset);
+ if (fill_str_len == 1) {
+ /* Handle single character fills as memset() even when
+ * the fill data comes from a one-char argument.
+ */
+ DUK_MEMSET((void *) p, (int) fill_str_ptr[0], (size_t) fill_length);
+ } else if (fill_str_len > 1) {
+ duk_size_t i, n, t;
+
+ for (i = 0, n = (fill_end - fill_offset), t = 0; i < n; i++) {
+ p[i] = fill_str_ptr[t++];
+ if (t >= fill_str_len) {
+ t = 0;
+ }
+ }
+ } else {
+ DUK_DDD(DUK_DDDPRINT("zero size fill pattern, ignore silently"));
+ }
+
+ /* Return the Buffer to allow chaining: b.fill(0x11).fill(0x22, 3, 5).toString() */
+ duk_push_this(ctx);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_fill(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.prototype.write(string, [offset], [length], [encoding])
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_write(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hbufferobject *h_this;
+ duk_uint_t offset;
+ duk_uint_t length;
+ const duk_uint8_t *str_data;
+ duk_size_t str_len;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ h_this = duk__require_bufobj_this(ctx);
+ DUK_ASSERT(h_this != NULL);
+
+ /* Argument must be a string, e.g. a buffer is not allowed. */
+ str_data = (const duk_uint8_t *) duk_require_lstring(ctx, 0, &str_len);
+
+ duk__resolve_offset_opt_length(ctx, h_this, 1, 2, &offset, &length, 0 /*throw_flag*/);
+ DUK_ASSERT(offset <= h_this->length);
+ DUK_ASSERT(offset + length <= h_this->length);
+
+ /* XXX: encoding is ignored now. */
+
+ if (length > str_len) {
+ length = (duk_uint_t) str_len;
+ }
+
+ if (DUK_HBUFFEROBJECT_VALID_SLICE(h_this)) {
+ /* Cannot overlap. */
+ DUK_MEMCPY((void *) (DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this) + offset),
+ (const void *) str_data,
+ (size_t) length);
+ } else {
+ DUK_DDD(DUK_DDDPRINT("write() target buffer is not covered, silent ignore"));
+ }
+
+ duk_push_uint(ctx, length);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_write(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.prototype.copy()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_copy(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hbufferobject *h_this;
+ duk_hbufferobject *h_bufarg;
+ duk_int_t source_length;
+ duk_int_t target_length;
+ duk_int_t target_start, source_start, source_end;
+ duk_uint_t target_ustart, source_ustart, source_uend;
+ duk_uint_t copy_size = 0;
+
+ /* [ targetBuffer targetStart sourceStart sourceEnd ] */
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ h_this = duk__require_bufobj_this(ctx);
+ h_bufarg = duk__require_bufobj_value(ctx, 0);
+ DUK_ASSERT(h_this != NULL);
+ DUK_ASSERT(h_bufarg != NULL);
+ source_length = (duk_int_t) h_this->length;
+ target_length = (duk_int_t) h_bufarg->length;
+
+ target_start = duk_to_int(ctx, 1);
+ source_start = duk_to_int(ctx, 2);
+ if (duk_is_undefined(ctx, 3)) {
+ source_end = source_length;
+ } else {
+ source_end = duk_to_int(ctx, 3);
+ }
+
+ DUK_DDD(DUK_DDDPRINT("checking copy args: target_start=%ld, target_length=%ld, "
+ "source_start=%ld, source_end=%ld, source_length=%ld",
+ (long) target_start, (long) h_bufarg->length,
+ (long) source_start, (long) source_end, (long) source_length));
+
+ /* This behavior mostly mimics Node.js now. */
+
+ if (source_start < 0 || source_end < 0 || target_start < 0) {
+ /* Negative offsets cause a RangeError. */
+ goto fail_bounds;
+ }
+ source_ustart = (duk_uint_t) source_start;
+ source_uend = (duk_uint_t) source_end;
+ target_ustart = (duk_uint_t) target_start;
+ if (source_ustart >= source_uend || /* crossed offsets or zero size */
+ source_ustart >= (duk_uint_t) source_length || /* source out-of-bounds (but positive) */
+ target_ustart >= (duk_uint_t) target_length) { /* target out-of-bounds (but positive) */
+ goto silent_ignore;
+ }
+ if (source_uend >= (duk_uint_t) source_length) {
+ /* Source end clamped silently to available length. */
+ source_uend = source_length;
+ }
+ copy_size = source_uend - source_ustart;
+ if (target_ustart + copy_size > (duk_uint_t) target_length) {
+ /* Clamp to target's end if too long.
+ *
+ * NOTE: there's no overflow possibility in the comparison;
+ * both target_ustart and copy_size are >= 0 and based on
+ * values in duk_int_t range. Adding them as duk_uint_t
+ * values is then guaranteed not to overflow.
+ */
+ DUK_ASSERT(target_ustart + copy_size >= target_ustart); /* no overflow */
+ DUK_ASSERT(target_ustart + copy_size >= copy_size); /* no overflow */
+ copy_size = (duk_uint_t) target_length - target_ustart;
+ }
+
+ DUK_DDD(DUK_DDDPRINT("making copy: target_ustart=%lu source_ustart=%lu copy_size=%lu",
+ (unsigned long) target_ustart, (unsigned long) source_ustart,
+ (unsigned long) copy_size));
+
+ DUK_ASSERT(copy_size >= 1);
+ DUK_ASSERT(source_ustart <= (duk_uint_t) source_length);
+ DUK_ASSERT(source_ustart + copy_size <= (duk_uint_t) source_length);
+ DUK_ASSERT(target_ustart <= (duk_uint_t) target_length);
+ DUK_ASSERT(target_ustart + copy_size <= (duk_uint_t) target_length);
+
+ /* Ensure copy is covered by underlying buffers. */
+ DUK_ASSERT(h_bufarg->buf != NULL); /* length check */
+ DUK_ASSERT(h_this->buf != NULL); /* length check */
+ if (DUK_HBUFFEROBJECT_VALID_BYTEOFFSET_EXCL(h_bufarg, target_ustart + copy_size) &&
+ DUK_HBUFFEROBJECT_VALID_BYTEOFFSET_EXCL(h_this, source_ustart + copy_size)) {
+ /* Must use memmove() because copy area may overlap (source and target
+ * buffer may be the same, or from different slices.
+ */
+ DUK_MEMMOVE((void *) (DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_bufarg) + target_ustart),
+ (const void *) (DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this) + source_ustart),
+ (size_t) copy_size);
+ } else {
+ DUK_DDD(DUK_DDDPRINT("buffer copy not covered by underlying buffer(s), ignoring"));
+ }
+
+ silent_ignore:
+ /* Return value is like write(), number of bytes written.
+ * The return value matters because of code like:
+ * "off += buf.copy(...)".
+ */
+ duk_push_uint(ctx, copy_size);
+ return 1;
+
+ fail_bounds:
+ return DUK_RET_RANGE_ERROR;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_copy(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * TypedArray.prototype.set()
+ *
+ * TypedArray set() is pretty interesting to implement because:
+ *
+ * - The source argument may be a plain array or a typedarray. If the
+ * source is a TypedArray, values are decoded and re-encoded into the
+ * target (not as a plain byte copy). This may happen even when the
+ * element byte size is the same, e.g. integer values may be re-encoded
+ * into floats.
+ *
+ * - Source and target may refer to the same underlying buffer, so that
+ * the set() operation may overlap. The specification requires that this
+ * must work as if a copy was made before the operation. Note that this
+ * is NOT a simple memmove() situation because the source and target
+ * byte sizes may be different -- e.g. a 4-byte source (Int8Array) may
+ * expand to a 16-byte target (Uint32Array) so that the target overlaps
+ * the source both from beginning and the end (unlike in typical memmove).
+ *
+ * - Even if 'buf' pointers of the source and target differ, there's no
+ * guarantee that their memory areas don't overlap. This may be the
+ * case with external buffers.
+ *
+ * Even so, it is nice to optimize for the common case:
+ *
+ * - Source and target separate buffers or non-overlapping.
+ *
+ * - Source and target have a compatible type so that a plain byte copy
+ * is possible. Note that while e.g. uint8 and int8 are compatible
+ * (coercion one way or another doesn't change the byte representation),
+ * e.g. int8 and uint8clamped are NOT compatible when writing int8
+ * values into uint8clamped typedarray (-1 would clamp to 0 for instance).
+ *
+ * See test-bi-typedarray-proto-set.js.
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_typedarray_set(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hbufferobject *h_this;
+ duk_hobject *h_obj;
+ duk_uarridx_t i, n;
+ duk_int_t offset_signed;
+ duk_uint_t offset_elems;
+ duk_uint_t offset_bytes;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ h_this = duk__require_bufobj_this(ctx);
+ DUK_ASSERT(h_this != NULL);
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_this);
+
+ if (h_this->buf == NULL) {
+ DUK_DDD(DUK_DDDPRINT("source neutered, skip copy"));
+ return 0;
+ }
+
+ h_obj = duk_require_hobject(ctx, 0);
+ DUK_ASSERT(h_obj != NULL);
+
+ /* XXX: V8 throws a TypeError for negative values. Would it
+ * be more useful to interpret negative offsets here from the
+ * end of the buffer too?
+ */
+ offset_signed = duk_to_int(ctx, 1);
+ if (offset_signed < 0) {
+ return DUK_RET_TYPE_ERROR;
+ }
+ offset_elems = (duk_uint_t) offset_signed;
+ offset_bytes = offset_elems << h_this->shift;
+ if ((offset_bytes >> h_this->shift) != offset_elems) {
+ /* Byte length would overflow. */
+ /* XXX: easier check with less code? */
+ return DUK_RET_RANGE_ERROR;
+ }
+ if (offset_bytes > h_this->length) {
+ /* Equality may be OK but >length not. Checking
+ * this explicitly avoids some overflow cases
+ * below.
+ */
+ return DUK_RET_RANGE_ERROR;
+ }
+ DUK_ASSERT(offset_bytes <= h_this->length);
+
+ /* Fast path: source is a TypedArray (or any bufferobject). */
+
+ if (DUK_HOBJECT_IS_BUFFEROBJECT(h_obj)) {
+ duk_hbufferobject *h_bufarg;
+ duk_uint16_t comp_mask;
+ duk_small_int_t no_overlap = 0;
+ duk_uint_t src_length;
+ duk_uint_t dst_length;
+ duk_uint_t dst_length_elems;
+ duk_uint8_t *p_src_base;
+ duk_uint8_t *p_src_end;
+ duk_uint8_t *p_src;
+ duk_uint8_t *p_dst_base;
+ duk_uint8_t *p_dst;
+ duk_small_uint_t src_elem_size;
+ duk_small_uint_t dst_elem_size;
+
+ h_bufarg = (duk_hbufferobject *) h_obj;
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufarg);
+
+ if (h_bufarg->buf == NULL) {
+ DUK_DDD(DUK_DDDPRINT("target neutered, skip copy"));
+ return 0;
+ }
+
+ /* Nominal size check. */
+ src_length = h_bufarg->length; /* bytes in source */
+ dst_length_elems = (src_length >> h_bufarg->shift); /* elems in source and dest */
+ dst_length = dst_length_elems << h_this->shift; /* bytes in dest */
+ if ((dst_length >> h_this->shift) != dst_length_elems) {
+ /* Byte length would overflow. */
+ /* XXX: easier check with less code? */
+ return DUK_RET_RANGE_ERROR;
+ }
+ DUK_DDD(DUK_DDDPRINT("nominal size check: src_length=%ld, dst_length=%ld",
+ (long) src_length, (long) dst_length));
+ DUK_ASSERT(offset_bytes <= h_this->length);
+ if (dst_length > h_this->length - offset_bytes) {
+ /* Overflow not an issue because subtraction is used on the right
+ * side and guaranteed to be >= 0.
+ */
+ DUK_DDD(DUK_DDDPRINT("copy exceeds target buffer nominal length"));
+ return DUK_RET_RANGE_ERROR;
+ }
+ if (!DUK_HBUFFEROBJECT_VALID_BYTEOFFSET_EXCL(h_this, offset_bytes + dst_length)) {
+ DUK_DDD(DUK_DDDPRINT("copy not covered by underlying target buffer, ignore"));
+ return 0;
+ }
+
+ p_src_base = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_bufarg);
+ p_dst_base = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this) + offset_bytes;
+
+ /* Check actual underlying buffers for validity and that they
+ * cover the copy. No side effects are allowed after the check
+ * so that the validity status doesn't change.
+ */
+ if (!DUK_HBUFFEROBJECT_VALID_SLICE(h_this) ||
+ !DUK_HBUFFEROBJECT_VALID_SLICE(h_bufarg)) {
+ /* The condition could be more narrow and check for the
+ * copy area only, but there's no need for fine grained
+ * behavior when the underlying buffer is misconfigured.
+ */
+ DUK_DDD(DUK_DDDPRINT("source and/or target not covered by underlying buffer, skip copy"));
+ return 0;
+ }
+
+ /* We want to do a straight memory copy if possible: this is
+ * an important operation because .set() is the TypedArray
+ * way to copy chunks of memory. However, because set()
+ * conceptually works in terms of elements, not all views are
+ * compatible with direct byte copying.
+ *
+ * If we do manage a direct copy, the "overlap issue" handled
+ * below can just be solved using memmove() because the source
+ * and destination element sizes are necessarily equal.
+ */
+
+ DUK_ASSERT(h_this->elem_type < sizeof(duk__buffer_elemtype_copy_compatible) / sizeof(duk_uint16_t));
+ comp_mask = duk__buffer_elemtype_copy_compatible[h_this->elem_type];
+ if (comp_mask & (1 << h_bufarg->elem_type)) {
+ DUK_ASSERT(src_length == dst_length);
+
+ DUK_DDD(DUK_DDDPRINT("fast path: able to use memmove() because views are compatible"));
+ DUK_MEMMOVE((void *) p_dst_base, (const void *) p_src_base, (size_t) dst_length);
+ return 0;
+ }
+ DUK_DDD(DUK_DDDPRINT("fast path: views are not compatible with a byte copy, copy by item"));
+
+ /* We want to avoid making a copy to process set() but that's
+ * not always possible: the source and the target may overlap
+ * and because element sizes are different, the overlap cannot
+ * always be handled with a memmove() or choosing the copy
+ * direction in a certain way. For example, if source type is
+ * uint8 and target type is uint32, the target area may exceed
+ * the source area from both ends!
+ *
+ * Note that because external buffers may point to the same
+ * memory areas, we must ultimately make this check using
+ * pointers.
+ *
+ * NOTE: careful with side effects: any side effect may cause
+ * a buffer resize (or external buffer pointer/length update)!
+ */
+
+ DUK_DDD(DUK_DDDPRINT("overlap check: p_src_base=%p, src_length=%ld, "
+ "p_dst_base=%p, dst_length=%ld",
+ (void *) p_src_base, (long) src_length,
+ (void *) p_dst_base, (long) dst_length));
+
+ if (p_src_base >= p_dst_base + dst_length || /* source starts after dest ends */
+ p_src_base + src_length <= p_dst_base) { /* source ends before dest starts */
+ no_overlap = 1;
+ }
+
+ if (!no_overlap) {
+ /* There's overlap: the desired end result is that
+ * conceptually a copy is made to avoid "trampling"
+ * of source data by destination writes. We make
+ * an actual temporary copy to handle this case.
+ */
+ duk_uint8_t *p_src_copy;
+
+ DUK_DDD(DUK_DDDPRINT("there is overlap, make a copy of the source"));
+ p_src_copy = (duk_uint8_t *) duk_push_fixed_buffer(ctx, src_length);
+ DUK_ASSERT(p_src_copy != NULL);
+ DUK_MEMCPY((void *) p_src_copy, (const void *) p_src_base, (size_t) src_length);
+
+ p_src_base = p_src_copy; /* use p_src_base from now on */
+ }
+ /* Value stack intentionally mixed size here. */
+
+ DUK_DDD(DUK_DDDPRINT("after overlap check: p_src_base=%p, src_length=%ld, "
+ "p_dst_base=%p, dst_length=%ld, valstack top=%ld",
+ (void *) p_src_base, (long) src_length,
+ (void *) p_dst_base, (long) dst_length,
+ (long) duk_get_top(ctx)));
+
+ /* Ready to make the copy. We must proceed element by element
+ * and must avoid any side effects that might cause the buffer
+ * validity check above to become invalid.
+ *
+ * Although we work through the value stack here, only plain
+ * numbers are handled which should be side effect safe.
+ */
+
+ src_elem_size = 1 << h_bufarg->shift;
+ dst_elem_size = 1 << h_this->shift;
+ p_src = p_src_base;
+ p_dst = p_dst_base;
+ p_src_end = p_src_base + src_length;
+
+ while (p_src != p_src_end) {
+ DUK_DDD(DUK_DDDPRINT("fast path per element copy loop: "
+ "p_src=%p, p_src_end=%p, p_dst=%p",
+ (void *) p_src, (void *) p_src_end, (void *) p_dst));
+ /* A validated read() is always a number, so it's write coercion
+ * is always side effect free an won't invalidate pointers etc.
+ */
+ duk_hbufferobject_push_validated_read(ctx, h_bufarg, p_src, src_elem_size);
+ duk_hbufferobject_validated_write(ctx, h_this, p_dst, dst_elem_size);
+ duk_pop(ctx);
+ p_src += src_elem_size;
+ p_dst += dst_elem_size;
+ }
+
+ return 0;
+ } else {
+ /* Slow path: quite slow, but we save space by using the property code
+ * to write coerce target values. We don't need to worry about overlap
+ * here because the source is not a TypedArray.
+ *
+ * We could use the bufferobject write coercion helper but since the
+ * property read may have arbitrary side effects, full validity checks
+ * would be needed for every element anyway.
+ */
+
+ n = (duk_uarridx_t) duk_get_length(ctx, 0);
+ DUK_ASSERT(offset_bytes <= h_this->length);
+ if ((n << h_this->shift) > h_this->length - offset_bytes) {
+ /* Overflow not an issue because subtraction is used on the right
+ * side and guaranteed to be >= 0.
+ */
+ DUK_DDD(DUK_DDDPRINT("copy exceeds target buffer nominal length"));
+ return DUK_RET_RANGE_ERROR;
+ }
+
+ /* There's no need to check for buffer validity status for the
+ * target here: the property access code will do that for each
+ * element. Moreover, if we did check the validity here, side
+ * effects from reading the source argument might invalidate
+ * the results anyway.
+ */
+
+ DUK_ASSERT_TOP(ctx, 2);
+ duk_push_this(ctx);
+
+ for (i = 0; i < n; i++) {
+ duk_get_prop_index(ctx, 0, i);
+ duk_put_prop_index(ctx, 2, offset_elems + i);
+ }
+ }
+
+ return 0;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_typedarray_set(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.prototype.slice([start], [end])
+ * ArrayBuffer.prototype.slice(begin, [end])
+ * TypedArray.prototype.slice(begin, [end])
+ *
+ * The API calls are almost identical; negative indices are counted from end
+ * of buffer, and final indices are clamped (allowing crossed indices). Main
+ * differences:
+ *
+ * - Copy/view behavior; Node.js .slice() and TypedArray .subarray() create
+ * views, ArrayBuffer .slice() creates a copy
+ *
+ * - Resulting object has a different class and prototype depending on the
+ * call (or 'this' argument)
+ *
+ * - TypedArray .subarray() arguments are element indices, not byte offsets
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_buffer_slice_shared(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_small_int_t magic;
+ duk_small_uint_t res_class_num;
+ duk_hobject *res_proto;
+ duk_hbufferobject *h_this;
+ duk_hbufferobject *h_bufobj;
+ duk_hbuffer *h_val;
+ duk_int_t start_offset, end_offset;
+ duk_uint_t slice_length;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ /* [ start end ] */
+
+ magic = duk_get_current_magic(ctx);
+ h_this = duk__require_bufobj_this(ctx);
+
+ /* Slice offsets are element (not byte) offsets, which only matters
+ * for TypedArray views, Node.js Buffer and ArrayBuffer have shift
+ * zero so byte and element offsets are the same. Negative indices
+ * are counted from end of slice, crossed indices are allowed (and
+ * result in zero length result), and final values are clamped
+ * against the current slice. There's intentionally no check
+ * against the underlying buffer here.
+ */
+
+ duk__clamp_startend_negidx_shifted(ctx, h_this, 0 /*idx_start*/, 1 /*idx_end*/, &start_offset, &end_offset);
+ DUK_ASSERT(end_offset >= start_offset);
+ slice_length = (duk_uint_t) (end_offset - start_offset);
+
+ /* The resulting buffer object gets the same class and prototype as
+ * the buffer in 'this', e.g. if the input is a Node.js Buffer the
+ * result is a Node.js Buffer; if the input is a Float32Array, the
+ * result is a Float32Array.
+ *
+ * For the class number this seems correct. The internal prototype
+ * is not so clear: if 'this' is a bufferobject with a non-standard
+ * prototype object, that value gets copied over into the result
+ * (instead of using the standard prototype for that object type).
+ */
+
+ res_class_num = DUK_HOBJECT_GET_CLASS_NUMBER((duk_hobject *) h_this);
+ h_bufobj = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(res_class_num),
+ DUK_BIDX_OBJECT_PROTOTYPE); /* replaced */
+ DUK_ASSERT(h_bufobj != NULL);
+ res_proto = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, (duk_hobject *) h_this); /* may be NULL */
+ DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, (duk_hobject *) h_bufobj, res_proto);
+
+ h_bufobj->length = slice_length;
+ h_bufobj->shift = h_this->shift; /* inherit */
+ h_bufobj->elem_type = h_this->elem_type; /* inherit */
+ h_bufobj->is_view = magic & 0x01;
+ DUK_ASSERT(h_bufobj->is_view == 0 || h_bufobj->is_view == 1);
+
+ h_val = h_this->buf;
+ if (h_val == NULL) {
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ if (magic & 0x02) {
+ /* non-zero: make copy */
+ duk_uint8_t *p_copy;
+ duk_size_t copy_length;
+
+ p_copy = (duk_uint8_t *) duk_push_fixed_buffer(ctx, (duk_size_t) slice_length);
+ DUK_ASSERT(p_copy != NULL);
+
+ /* Copy slice, respecting underlying buffer limits; remainder
+ * is left as zero.
+ */
+ copy_length = DUK_HBUFFEROBJECT_CLAMP_BYTELENGTH(h_this, slice_length);
+ DUK_MEMCPY((void *) p_copy,
+ (const void *) (DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this) + start_offset),
+ copy_length);
+
+ h_val = duk_get_hbuffer(ctx, -1);
+ DUK_ASSERT(h_val != NULL);
+
+ h_bufobj->buf = h_val;
+ DUK_HBUFFER_INCREF(thr, h_val);
+ DUK_ASSERT(h_bufobj->offset == 0);
+
+ duk_pop(ctx); /* reachable so pop OK */
+ } else {
+ h_bufobj->buf = h_val;
+ DUK_HBUFFER_INCREF(thr, h_val);
+ h_bufobj->offset = (duk_uint_t) (h_this->offset + start_offset);
+
+ /* Copy the .buffer property, needed for TypedArray.prototype.subarray().
+ *
+ * XXX: limit copy only for TypedArray classes specifically?
+ */
+
+ duk_push_this(ctx);
+ if (duk_get_prop_stridx(ctx, -1, DUK_STRIDX_LC_BUFFER)) {
+ duk_xdef_prop_stridx(ctx, -3, DUK_STRIDX_LC_BUFFER, DUK_PROPDESC_FLAGS_NONE);
+ duk_pop(ctx);
+ } else {
+ duk_pop_2(ctx);
+ }
+ }
+ /* unbalanced stack on purpose */
+
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufobj);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_buffer_slice_shared(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.isEncoding()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_is_encoding(duk_context *ctx) {
+ const char *encoding;
+
+ /* only accept lowercase 'utf8' now. */
+
+ encoding = duk_to_string(ctx, 0);
+ DUK_ASSERT(duk_is_string(ctx, 0)); /* guaranteed by duk_to_string() */
+ duk_push_boolean(ctx, DUK_STRCMP(encoding, "utf8") == 0);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_is_encoding(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.isBuffer()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_is_buffer(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_tval *tv;
+ duk_hobject *h;
+ duk_hobject *h_proto;
+ duk_bool_t ret = 0;
+
+ thr = (duk_hthread *) ctx;
+
+ DUK_ASSERT(duk_get_top(ctx) >= 1); /* nargs */
+ tv = duk_get_tval(ctx, 0);
+ DUK_ASSERT(tv != NULL);
+
+ if (DUK_TVAL_IS_OBJECT(tv)) {
+ h = DUK_TVAL_GET_OBJECT(tv);
+ DUK_ASSERT(h != NULL);
+
+ h_proto = thr->builtins[DUK_BIDX_NODEJS_BUFFER_PROTOTYPE];
+ DUK_ASSERT(h_proto != NULL);
+
+ h = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, h);
+ if (h) {
+ ret = duk_hobject_prototype_chain_contains(thr, h, h_proto, 0 /*ignore_loop*/);
+ }
+ }
+
+ duk_push_boolean(ctx, ret);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_is_buffer(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.byteLength()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_byte_length(duk_context *ctx) {
+ const char *str;
+ duk_size_t len;
+
+ /* At the moment Buffer(<str>) will just use the string bytes as
+ * is (ignoring encoding), so we return the string length here
+ * unconditionally.
+ */
+
+ str = duk_to_lstring(ctx, 0, &len);
+ DUK_UNREF(str);
+ duk_push_size_t(ctx, len);
+ return 1;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_byte_length(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Node.js Buffer.concat()
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_concat(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_hobject *h_arg;
+ duk_int_t total_length = 0;
+ duk_hbufferobject *h_bufobj;
+ duk_hbufferobject *h_bufres;
+ duk_hbuffer *h_val;
+ duk_uint_t i, n;
+ duk_uint8_t *p;
+ duk_size_t space_left;
+ duk_size_t copy_size;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ /* Node.js accepts only actual Arrays. */
+ h_arg = duk_require_hobject(ctx, 0);
+ if (DUK_HOBJECT_GET_CLASS_NUMBER(h_arg) != DUK_HOBJECT_CLASS_ARRAY) {
+ return DUK_RET_TYPE_ERROR;
+ }
+
+ /* Compute result length and validate argument buffers. */
+ n = (duk_uint_t) duk_get_length(ctx, 0);
+ for (i = 0; i < n; i++) {
+ /* Neutered checks not necessary here: neutered buffers have
+ * zero 'length' so we'll effectively skip them.
+ */
+ DUK_ASSERT_TOP(ctx, 2); /* [ array totalLength ] */
+ duk_get_prop_index(ctx, 0, (duk_uarridx_t) i); /* -> [ array totalLength buf ] */
+ h_bufobj = duk__require_bufobj_value(ctx, 2);
+ DUK_ASSERT(h_bufobj != NULL);
+ total_length += h_bufobj->length;
+ duk_pop(ctx);
+ }
+ if (n == 1) {
+ /* For the case n==1 Node.js doesn't seem to type check
+ * the sole member but we do it before returning it.
+ * For this case only the original buffer object is
+ * returned (not a copy).
+ */
+ duk_get_prop_index(ctx, 0, 0);
+ return 1;
+ }
+
+ /* User totalLength overrides a computed length, but we'll check
+ * every copy in the copy loop. Note that duk_to_uint() can
+ * technically have arbitrary side effects so we need to recheck
+ * the buffers in the copy loop.
+ */
+ if (!duk_is_undefined(ctx, 1) && n > 0) {
+ /* For n == 0, Node.js ignores totalLength argument and
+ * returns a zero length buffer.
+ */
+ total_length = duk_to_int(ctx, 1);
+ }
+ if (total_length < 0) {
+ return DUK_RET_RANGE_ERROR;
+ }
+
+ h_bufres = duk_push_bufferobject_raw(ctx,
+ DUK_HOBJECT_FLAG_EXTENSIBLE |
+ DUK_HOBJECT_FLAG_BUFFEROBJECT |
+ DUK_HOBJECT_CLASS_AS_FLAGS(DUK_HOBJECT_CLASS_BUFFER),
+ DUK_BIDX_NODEJS_BUFFER_PROTOTYPE);
+ DUK_ASSERT(h_bufres != NULL);
+
+ p = (duk_uint8_t *) duk_push_fixed_buffer(ctx, total_length);
+ DUK_ASSERT(p != NULL);
+ space_left = total_length;
+
+ for (i = 0; i < n; i++) {
+ DUK_ASSERT_TOP(ctx, 4); /* [ array totalLength bufres buf ] */
+
+ duk_get_prop_index(ctx, 0, (duk_uarridx_t) i);
+ h_bufobj = duk__require_bufobj_value(ctx, 4);
+ DUK_ASSERT(h_bufobj != NULL);
+
+ copy_size = h_bufobj->length;
+ if (copy_size > space_left) {
+ copy_size = space_left;
+ }
+
+ if (h_bufobj->buf != NULL &&
+ DUK_HBUFFEROBJECT_VALID_SLICE(h_bufobj)) {
+ DUK_MEMCPY((void *) p,
+ (const void *) DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_bufobj),
+ copy_size);
+ } else {
+ /* Just skip, leaving zeroes in the result. */
+ ;
+ }
+ p += copy_size;
+ space_left -= copy_size;
+
+ duk_pop(ctx);
+ }
+
+ h_val = duk_get_hbuffer(ctx, -1);
+ DUK_ASSERT(h_val != NULL);
+
+ duk__set_bufobj_buffer(ctx, h_bufres, h_val);
+ DUK_ASSERT_HBUFFEROBJECT_VALID(h_bufres);
+
+ duk_pop(ctx); /* pop plain buffer, now reachable through h_bufres */
+
+ return 1; /* return h_bufres */
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_nodejs_buffer_concat(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+/*
+ * Shared readfield and writefield methods
+ *
+ * The readfield/writefield methods need support for endianness and field
+ * types. All offsets are byte based so no offset shifting is needed.
+ */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* Format of magic, bits:
+ * 0...1: field type; 0=uint8, 1=uint16, 2=uint32, 3=float, 4=double, 5=unused, 6=unused, 7=unused
+ * 3: endianness: 0=little, 1=big
+ * 4: signed: 1=yes, 0=no
+ * 5: typedarray: 1=yes, 0=no
+ */
+#define DUK__FLD_8BIT 0
+#define DUK__FLD_16BIT 1
+#define DUK__FLD_32BIT 2
+#define DUK__FLD_FLOAT 3
+#define DUK__FLD_DOUBLE 4
+#define DUK__FLD_VARINT 5
+#define DUK__FLD_BIGENDIAN (1 << 3)
+#define DUK__FLD_SIGNED (1 << 4)
+#define DUK__FLD_TYPEDARRAY (1 << 5)
+
+/* XXX: split into separate functions for each field type? */
+DUK_INTERNAL duk_ret_t duk_bi_buffer_readfield(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_small_int_t magic = (duk_small_int_t) duk_get_current_magic(ctx);
+ duk_small_int_t magic_ftype;
+ duk_small_int_t magic_bigendian;
+ duk_small_int_t magic_signed;
+ duk_small_int_t magic_typedarray;
+ duk_small_int_t endswap;
+ duk_hbufferobject *h_this;
+ duk_bool_t no_assert;
+ duk_int_t offset_signed;
+ duk_uint_t offset;
+ duk_uint_t buffer_length;
+ duk_uint_t check_length;
+ duk_uint8_t *buf;
+ duk_double_union du;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ magic_ftype = magic & 0x0007;
+ magic_bigendian = magic & 0x0008;
+ magic_signed = magic & 0x0010;
+ magic_typedarray = magic & 0x0020;
+
+ h_this = duk__require_bufobj_this(ctx);
+ DUK_ASSERT(h_this != NULL);
+ buffer_length = h_this->length;
+
+ /* [ offset noAssert ], when ftype != DUK__FLD_VARINT */
+ /* [ offset fieldByteLength noAssert ], when ftype == DUK__FLD_VARINT */
+ /* [ offset littleEndian ], when DUK__FLD_TYPEDARRAY (regardless of ftype) */
+
+ /* Handle TypedArray vs. Node.js Buffer arg differences */
+ if (magic_typedarray) {
+ no_assert = 0;
+#if defined(DUK_USE_INTEGER_LE)
+ endswap = !duk_to_boolean(ctx, 1); /* 1=little endian */
+#else
+ endswap = duk_to_boolean(ctx, 1); /* 1=little endian */
+#endif
+ } else {
+ no_assert = duk_to_boolean(ctx, (magic_ftype == DUK__FLD_VARINT) ? 2 : 1);
+#if defined(DUK_USE_INTEGER_LE)
+ endswap = magic_bigendian;
+#else
+ endswap = !magic_bigendian;
+#endif
+ }
+
+ /* Offset is coerced first to signed integer range and then to unsigned.
+ * This ensures we can add a small byte length (1-8) to the offset in
+ * bound checks and not wrap.
+ */
+ offset_signed = duk_to_int(ctx, 0);
+ offset = (duk_uint_t) offset_signed;
+ if (offset_signed < 0) {
+ goto fail_bounds;
+ }
+
+ DUK_DDD(DUK_DDDPRINT("readfield, buffer_length=%ld, offset=%ld, no_assert=%d, "
+ "magic=%04x, magic_fieldtype=%d, magic_bigendian=%d, magic_signed=%d, "
+ "endswap=%d",
+ (long) buffer_length, (long) offset, (int) no_assert,
+ (unsigned int) magic, (int) magic_ftype, (int) (magic_bigendian >> 3),
+ (int) (magic_signed >> 4), (int) endswap));
+
+ /* Update 'buffer_length' to be the effective, safe limit which
+ * takes into account the underlying buffer. This value will be
+ * potentially invalidated by any side effect.
+ */
+ check_length = DUK_HBUFFEROBJECT_CLAMP_BYTELENGTH(h_this, buffer_length);
+ DUK_DDD(DUK_DDDPRINT("buffer_length=%ld, check_length=%ld",
+ (long) buffer_length, (long) check_length));
+
+ if (h_this->buf) {
+ buf = DUK_HBUFFEROBJECT_GET_SLICE_BASE(thr->heap, h_this);
+ } else {
+ /* Neutered. We could go into the switch-case safely with
+ * buf == NULL because check_length == 0. To avoid scanbuild
+ * warnings, fail directly instead.
+ */
+ DUK_ASSERT(check_length == 0);
+ goto fail_neutered;
+ }
+ DUK_ASSERT(buf != NULL);
+
+ switch (magic_ftype) {
+ case DUK__FLD_8BIT: {
+ duk_uint8_t tmp;
+ if (offset + 1U > check_length) {
+ goto fail_bounds;
+ }
+ tmp = buf[offset];
+ if (magic_signed) {
+ duk_push_int(ctx, (duk_int_t) ((duk_int8_t) tmp));
+ } else {
+ duk_push_uint(ctx, (duk_uint_t) tmp);
+ }
+ break;
+ }
+ case DUK__FLD_16BIT: {
+ duk_uint16_t tmp;
+ if (offset + 2U > check_length) {
+ goto fail_bounds;
+ }
+ DUK_MEMCPY((void *) du.uc, (const void *) (buf + offset), 2);
+ tmp = du.us[0];
+ if (endswap) {
+ tmp = DUK_BSWAP16(tmp);
+ }
+ if (magic_signed) {
+ duk_push_int(ctx, (duk_int_t) ((duk_int16_t) tmp));
+ } else {
+ duk_push_uint(ctx, (duk_uint_t) tmp);
+ }
+ break;
+ }
+ case DUK__FLD_32BIT: {
+ duk_uint32_t tmp;
+ if (offset + 4U > check_length) {
+ goto fail_bounds;
+ }
+ DUK_MEMCPY((void *) du.uc, (const void *) (buf + offset), 4);
+ tmp = du.ui[0];
+ if (endswap) {
+ tmp = DUK_BSWAP32(tmp);
+ }
+ if (magic_signed) {
+ duk_push_int(ctx, (duk_int_t) ((duk_int32_t) tmp));
+ } else {
+ duk_push_uint(ctx, (duk_uint_t) tmp);
+ }
+ break;
+ }
+ case DUK__FLD_FLOAT: {
+ duk_uint32_t tmp;
+ if (offset + 4U > check_length) {
+ goto fail_bounds;
+ }
+ DUK_MEMCPY((void *) du.uc, (const void *) (buf + offset), 4);
+ if (endswap) {
+ tmp = du.ui[0];
+ tmp = DUK_BSWAP32(tmp);
+ du.ui[0] = tmp;
+ }
+ duk_push_number(ctx, (duk_double_t) du.f[0]);
+ break;
+ }
+ case DUK__FLD_DOUBLE: {
+ if (offset + 8U > check_length) {
+ goto fail_bounds;
+ }
+ DUK_MEMCPY((void *) du.uc, (const void *) (buf + offset), 8);
+ if (endswap) {
+ DUK_DBLUNION_BSWAP64(&du);
+ }
+ duk_push_number(ctx, (duk_double_t) du.d);
+ break;
+ }
+ case DUK__FLD_VARINT: {
+ /* Node.js Buffer variable width integer field. We don't really
+ * care about speed here, so aim for shortest algorithm.
+ */
+ duk_int_t field_bytelen;
+ duk_int_t i, i_step, i_end;
+#if defined(DUK_USE_64BIT_OPS)
+ duk_int64_t tmp;
+ duk_small_uint_t shift_tmp;
+#else
+ duk_double_t tmp;
+ duk_small_int_t highbyte;
+#endif
+ const duk_uint8_t *p;
+
+ field_bytelen = duk_get_int(ctx, 1); /* avoid side effects! */
+ if (field_bytelen < 1 || field_bytelen > 6) {
+ goto fail_field_length;
+ }
+ if (offset + (duk_uint_t) field_bytelen > check_length) {
+ goto fail_bounds;
+ }
+ p = (const duk_uint8_t *) (buf + offset);
+
+ /* Slow gathering of value using either 64-bit arithmetic
+ * or IEEE doubles if 64-bit types not available. Handling
+ * of negative numbers is a bit non-obvious in both cases.
+ */
+
+ if (magic_bigendian) {
+ /* Gather in big endian */
+ i = 0;
+ i_step = 1;
+ i_end = field_bytelen; /* one i_step over */
+ } else {
+ /* Gather in little endian */
+ i = field_bytelen - 1;
+ i_step = -1;
+ i_end = -1; /* one i_step over */
+ }
+
+#if defined(DUK_USE_64BIT_OPS)
+ tmp = 0;
+ do {
+ DUK_ASSERT(i >= 0 && i < field_bytelen);
+ tmp = (tmp << 8) + (duk_int64_t) p[i];
+ i += i_step;
+ } while (i != i_end);
+
+ if (magic_signed) {
+ /* Shift to sign extend. */
+ shift_tmp = 64 - (field_bytelen * 8);
+ tmp = (tmp << shift_tmp) >> shift_tmp;
+ }
+
+ duk_push_i64(ctx, tmp);
+#else
+ highbyte = p[i];
+ if (magic_signed && (highbyte & 0x80) != 0) {
+ /* 0xff => 255 - 256 = -1; 0x80 => 128 - 256 = -128 */
+ tmp = (duk_double_t) (highbyte - 256);
+ } else {
+ tmp = (duk_double_t) highbyte;
+ }
+ for (;;) {
+ i += i_step;
+ if (i == i_end) {
+ break;
+ }
+ DUK_ASSERT(i >= 0 && i < field_bytelen);
+ tmp = (tmp * 256.0) + (duk_double_t) p[i];
+ }
+
+ duk_push_number(ctx, tmp);
+#endif
+ break;
+ }
+ default: { /* should never happen but default here */
+ goto fail_bounds;
+ }
+ }
+
+ return 1;
+
+ fail_neutered:
+ fail_field_length:
+ fail_bounds:
+ if (no_assert) {
+ /* Node.js return value for noAssert out-of-bounds reads is
+ * usually (but not always) NaN. Return NaN consistently.
+ */
+ duk_push_nan(ctx);
+ return 1;
+ }
+
+ return DUK_RET_RANGE_ERROR;
+}
+#else /* DUK_USE_BUFFEROBJECT_SUPPORT */
+DUK_INTERNAL duk_ret_t duk_bi_buffer_readfield(duk_context *ctx) {
+ DUK_UNREF(ctx);
+ return DUK_RET_UNSUPPORTED_ERROR;
+}
+#endif /* DUK_USE_BUFFEROBJECT_SUPPORT */
+
+#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
+/* XXX: split into separate functions for each field type? */
+DUK_INTERNAL duk_ret_t duk_bi_buffer_writefield(duk_context *ctx) {
+ duk_hthread *thr;
+ duk_small_int_t magic = (duk_small_int_t) duk_get_current_magic(ctx);
+ duk_small_int_t magic_ftype;
+ duk_small_int_t magic_bigendian;
+ duk_small_int_t magic_signed;
+ duk_small_int_t magic_typedarray;
+ duk_small_int_t endswap;
+ duk_hbufferobject *h_this;
+ duk_bool_t no_assert;
+ duk_int_t offset_signed;
+ duk_uint_t offset;
+ duk_uint_t buffer_length;
+ duk_uint_t check_length;
+ duk_uint8_t *buf;
+ duk_double_union du;
+ duk_int_t nbytes = 0;
+
+ thr = (duk_hthread *) ctx;
+ DUK_UNREF(thr);
+
+ magic_ftype = magic & 0x0007;
+ magic_bigendian = magic & 0x0008;
+ magic_signed = magic & 0x0010;
+ magic_typedarray = magic & 0x0020;
+ DUK_UNREF(magic_signed);
+
+ h_this = duk__require_bufobj_this(ctx);
+ DUK_ASSERT(h_this != NULL);
+ buffer_length = h_this->length;
+
+ /* [ value offset noAssert ], when ftype != DUK__FLD_VARINT */
+ /* [ value offset fieldByteLength noAssert ], when ftype == DUK__FLD_VARINT */
+ /* [ offset value littleEndian ], when DUK__FLD_TYPEDARRAY (regardless of ftype) */
+
+ /* Handle TypedArray vs. Node.js Buffer arg differences */
+ if (magic_typedarray) {
+ no_assert = 0;
+#if defined(DUK_USE_INTEGER_LE)
+ endswap = !duk_to_boolean(ctx, 2); /* 1=little endian */
+#else
+ endswap = duk_to_boolean(ctx, 2); /* 1=little endian */
+#endif
+ duk_swap(ctx, 0, 1); /* offset/value order different from Node.js */
+ } else {
+ no_assert = duk_to_boolean(ctx, (magic_ftype == DUK__FLD_VARINT) ? 3 : 2);
+#if defined(DUK_USE_INTEGER_LE)
+ endswap = magic_bigendian;
+#else
+ endswap = !magic_bigendian;
+#endif
+ }
+
+ /* Offset is coerced first to signed integer range and then to unsigned.
+ * This ensures we can add a small byte length (1-8) to the offset in
+ * bound checks and not wrap.
+ */
+ offset_signed = duk_to_int(ctx, 1);
+ offset = (duk_uint_t) offset_signed;
+
+ /* We need 'nbytes' even for a failed offset; return value must be
+ * (offset + nbytes) even when write fails due to invalid offset.
+ */
+ if (magic_ftype != DUK__FLD_VARINT) {
+ DUK_ASSERT(magic_ftype >= 0 && magic_ftype < (duk_small_int_t) (sizeof(duk__buffer_nbytes_from_fldtype) / sizeof(duk_uint8_t)));
+ nbytes = duk__buffer_nbytes_from_fldtype[magic_ftype];
+ } else {
+ nbytes = duk_get_int(ctx, 2);
+ if (nbytes < 1 || nbytes > 6) {
+ goto fail_field_length;
+ }
+ }
+ DUK_ASSERT(nbytes >= 1 && nbytes <= 8);
+
+ /* Now we can check offset validity. */
+ if (offset_signed < 0) {
+ goto fail_bounds;
+ }
+
+ DUK_DDD(DUK_DDDPRINT("writefield, value=%!T, buffer_length=%ld, offset=%ld, no_assert=%d, "
+ "magic=%04x, magic_fieldtype=%d, magic_bigendian=%d, magic_signed=%d, "
+ "endswap=%d",
+ duk_get_tval(ctx, 0), (long) buffer_length, (long) offset, (int) no_assert,
+ (unsigned int) magic, (int) magic_ftype, (int) (magic_bigendian >> 3),
+ (int) (magic_signed >> 4), (int) endswap));
+
+ /* Coerce value to a number before computing check_length, so that
+ * the field type specific coercion below can't have side effects
+ * that would invalidate check_length.
+ */
+ duk_to_number(ctx, 0);
+
+ /* Update 'buffer_length' to be the effective, safe limit which
+ * takes into account the underlying buffer. This value will be
+ * potentially invalidated by any side effect.
+ */
+ check_length = DUK_HBUFFEROBJECT_CLAMP_BYTELENGTH(h_this, buffer_length);
+ DUK_DDD(DUK_DDDPRINT("buffer_length=%ld, check_length=%ld",
+ (long) buffer_length, (long) check_length));
+
+ if
<TRUNCATED>