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Posted to commits@tika.apache.org by ta...@apache.org on 2015/05/29 16:36:24 UTC
svn commit: r1682489 [8/14] - in /tika/trunk:
tika-parsers/src/main/java/org/apache/tika/parser/html/
tika-parsers/src/main/java/org/apache/tika/parser/image/
tika-parsers/src/main/java/org/apache/tika/parser/image/xmp/
tika-parsers/src/main/java/org/a...
Modified: tika/trunk/tika-parsers/src/main/java/org/apache/tika/parser/txt/CharsetRecog_mbcs.java
URL: http://svn.apache.org/viewvc/tika/trunk/tika-parsers/src/main/java/org/apache/tika/parser/txt/CharsetRecog_mbcs.java?rev=1682489&r1=1682488&r2=1682489&view=diff
==============================================================================
--- tika/trunk/tika-parsers/src/main/java/org/apache/tika/parser/txt/CharsetRecog_mbcs.java (original)
+++ tika/trunk/tika-parsers/src/main/java/org/apache/tika/parser/txt/CharsetRecog_mbcs.java Fri May 29 14:36:21 2015
@@ -11,56 +11,58 @@ import java.util.Arrays;
/**
* CharsetRecognizer implemenation for Asian - double or multi-byte - charsets.
- * Match is determined mostly by the input data adhering to the
- * encoding scheme for the charset, and, optionally,
- * frequency-of-occurence of characters.
+ * Match is determined mostly by the input data adhering to the
+ * encoding scheme for the charset, and, optionally,
+ * frequency-of-occurence of characters.
* <p/>
- * Instances of this class are singletons, one per encoding
- * being recognized. They are created in the main
- * CharsetDetector class and kept in the global list of available
- * encodings to be checked. The specific encoding being recognized
- * is determined by subclass.
- *
- * @internal
+ * Instances of this class are singletons, one per encoding
+ * being recognized. They are created in the main
+ * CharsetDetector class and kept in the global list of available
+ * encodings to be checked. The specific encoding being recognized
+ * is determined by subclass.
+ *
+ * @internal
*/
abstract class CharsetRecog_mbcs extends CharsetRecognizer {
- /**
+ /**
* Get the IANA name of this charset.
+ *
* @return the charset name.
*/
- abstract String getName() ;
-
-
+ abstract String getName();
+
+
/**
* Test the match of this charset with the input text data
- * which is obtained via the CharsetDetector object.
- *
- * @param det The CharsetDetector, which contains the input text
- * to be checked for being in this charset.
- * @return Two values packed into one int (Damn java, anyhow)
- * <br/>
- * bits 0-7: the match confidence, ranging from 0-100
- * <br/>
- * bits 8-15: The match reason, an enum-like value.
+ * which is obtained via the CharsetDetector object.
+ *
+ * @param det The CharsetDetector, which contains the input text
+ * to be checked for being in this charset.
+ * @return Two values packed into one int (Damn java, anyhow)
+ * <br/>
+ * bits 0-7: the match confidence, ranging from 0-100
+ * <br/>
+ * bits 8-15: The match reason, an enum-like value.
*/
- int match(CharsetDetector det, int [] commonChars) {
- int singleByteCharCount = 0;
- int doubleByteCharCount = 0;
- int commonCharCount = 0;
- int badCharCount = 0;
- int totalCharCount = 0;
- int confidence = 0;
- iteratedChar iter = new iteratedChar();
-
- detectBlock: {
- for (iter.reset(); nextChar(iter, det);) {
+ int match(CharsetDetector det, int[] commonChars) {
+ int singleByteCharCount = 0;
+ int doubleByteCharCount = 0;
+ int commonCharCount = 0;
+ int badCharCount = 0;
+ int totalCharCount = 0;
+ int confidence = 0;
+ iteratedChar iter = new iteratedChar();
+
+ detectBlock:
+ {
+ for (iter.reset(); nextChar(iter, det); ) {
totalCharCount++;
if (iter.error) {
- badCharCount++;
+ badCharCount++;
} else {
long cv = iter.charValue & 0xFFFFFFFFL;
-
+
if (cv <= 0xff) {
singleByteCharCount++;
} else {
@@ -73,470 +75,458 @@ abstract class CharsetRecog_mbcs extends
}
}
}
- if (badCharCount >= 2 && badCharCount*5 >= doubleByteCharCount) {
+ if (badCharCount >= 2 && badCharCount * 5 >= doubleByteCharCount) {
// Bail out early if the byte data is not matching the encoding scheme.
break detectBlock;
}
}
-
- if (doubleByteCharCount <= 10 && badCharCount== 0) {
+
+ if (doubleByteCharCount <= 10 && badCharCount == 0) {
// Not many multi-byte chars.
if (doubleByteCharCount == 0 && totalCharCount < 10) {
// There weren't any multibyte sequences, and there was a low density of non-ASCII single bytes.
// We don't have enough data to have any confidence.
// Statistical analysis of single byte non-ASCII charcters would probably help here.
confidence = 0;
- }
- else {
+ } else {
// ASCII or ISO file? It's probably not our encoding,
// but is not incompatible with our encoding, so don't give it a zero.
confidence = 10;
}
-
+
break detectBlock;
}
-
+
//
// No match if there are too many characters that don't fit the encoding scheme.
// (should we have zero tolerance for these?)
//
- if (doubleByteCharCount < 20*badCharCount) {
+ if (doubleByteCharCount < 20 * badCharCount) {
confidence = 0;
break detectBlock;
}
-
+
if (commonChars == null) {
// We have no statistics on frequently occuring characters.
// Assess confidence purely on having a reasonable number of
// multi-byte characters (the more the better
- confidence = 30 + doubleByteCharCount - 20*badCharCount;
+ confidence = 30 + doubleByteCharCount - 20 * badCharCount;
if (confidence > 100) {
confidence = 100;
}
- }else {
+ } else {
//
// Frequency of occurence statistics exist.
//
- double maxVal = Math.log((float)doubleByteCharCount / 4);
+ double maxVal = Math.log((float) doubleByteCharCount / 4);
double scaleFactor = 90.0 / maxVal;
- confidence = (int)(Math.log(commonCharCount+1) * scaleFactor + 10);
+ confidence = (int) (Math.log(commonCharCount + 1) * scaleFactor + 10);
confidence = Math.min(confidence, 100);
}
} // end of detectBlock:
-
+
return confidence;
}
-
- // "Character" iterated character class.
- // Recognizers for specific mbcs encodings make their "characters" available
- // by providing a nextChar() function that fills in an instance of iteratedChar
- // with the next char from the input.
- // The returned characters are not converted to Unicode, but remain as the raw
- // bytes (concatenated into an int) from the codepage data.
- //
- // For Asian charsets, use the raw input rather than the input that has been
- // stripped of markup. Detection only considers multi-byte chars, effectively
- // stripping markup anyway, and double byte chars do occur in markup too.
- //
- static class iteratedChar {
- int charValue = 0; // 1-4 bytes from the raw input data
- int index = 0;
- int nextIndex = 0;
- boolean error = false;
- boolean done = false;
-
- void reset() {
- charValue = 0;
- index = -1;
- nextIndex = 0;
- error = false;
- done = false;
- }
-
- int nextByte(CharsetDetector det) {
- if (nextIndex >= det.fRawLength) {
- done = true;
- return -1;
- }
- int byteValue = (int)det.fRawInput[nextIndex++] & 0x00ff;
- return byteValue;
- }
- }
-
- /**
- * Get the next character (however many bytes it is) from the input data
- * Subclasses for specific charset encodings must implement this function
- * to get characters according to the rules of their encoding scheme.
- *
- * This function is not a method of class iteratedChar only because
- * that would require a lot of extra derived classes, which is awkward.
- * @param it The iteratedChar "struct" into which the returned char is placed.
- * @param det The charset detector, which is needed to get at the input byte data
- * being iterated over.
- * @return True if a character was returned, false at end of input.
- */
- abstract boolean nextChar(iteratedChar it, CharsetDetector det);
-
-
-
-
-
- /**
- * Shift-JIS charset recognizer.
- *
- */
- static class CharsetRecog_sjis extends CharsetRecog_mbcs {
- static int [] commonChars =
- // TODO: This set of data comes from the character frequency-
- // of-occurence analysis tool. The data needs to be moved
- // into a resource and loaded from there.
- {0x8140, 0x8141, 0x8142, 0x8145, 0x815b, 0x8169, 0x816a, 0x8175, 0x8176, 0x82a0,
- 0x82a2, 0x82a4, 0x82a9, 0x82aa, 0x82ab, 0x82ad, 0x82af, 0x82b1, 0x82b3, 0x82b5,
- 0x82b7, 0x82bd, 0x82be, 0x82c1, 0x82c4, 0x82c5, 0x82c6, 0x82c8, 0x82c9, 0x82cc,
- 0x82cd, 0x82dc, 0x82e0, 0x82e7, 0x82e8, 0x82e9, 0x82ea, 0x82f0, 0x82f1, 0x8341,
- 0x8343, 0x834e, 0x834f, 0x8358, 0x835e, 0x8362, 0x8367, 0x8375, 0x8376, 0x8389,
- 0x838a, 0x838b, 0x838d, 0x8393, 0x8e96, 0x93fa, 0x95aa};
-
- boolean nextChar(iteratedChar it, CharsetDetector det) {
- it.index = it.nextIndex;
- it.error = false;
- int firstByte;
- firstByte = it.charValue = it.nextByte(det);
- if (firstByte < 0) {
- return false;
- }
-
- if (firstByte <= 0x7f || (firstByte>0xa0 && firstByte<=0xdf)) {
- return true;
- }
-
- int secondByte = it.nextByte(det);
- if (secondByte < 0) {
- return false;
- }
- it.charValue = (firstByte << 8) | secondByte;
- if (! ((secondByte>=0x40 && secondByte<=0x7f) || (secondByte>=0x80 && secondByte<=0xff))) {
- // Illegal second byte value.
- it.error = true;
- }
- return true;
- }
-
- int match(CharsetDetector det) {
- return match(det, commonChars);
- }
-
- String getName() {
- return "Shift_JIS";
- }
-
- public String getLanguage()
- {
- return "ja";
- }
-
-
- }
-
-
- /**
- * Big5 charset recognizer.
- *
- */
- static class CharsetRecog_big5 extends CharsetRecog_mbcs {
- static int [] commonChars =
- // TODO: This set of data comes from the character frequency-
- // of-occurence analysis tool. The data needs to be moved
- // into a resource and loaded from there.
- {0xa140, 0xa141, 0xa142, 0xa143, 0xa147, 0xa149, 0xa175, 0xa176, 0xa440, 0xa446,
- 0xa447, 0xa448, 0xa451, 0xa454, 0xa457, 0xa464, 0xa46a, 0xa46c, 0xa477, 0xa4a3,
- 0xa4a4, 0xa4a7, 0xa4c1, 0xa4ce, 0xa4d1, 0xa4df, 0xa4e8, 0xa4fd, 0xa540, 0xa548,
- 0xa558, 0xa569, 0xa5cd, 0xa5e7, 0xa657, 0xa661, 0xa662, 0xa668, 0xa670, 0xa6a8,
- 0xa6b3, 0xa6b9, 0xa6d3, 0xa6db, 0xa6e6, 0xa6f2, 0xa740, 0xa751, 0xa759, 0xa7da,
- 0xa8a3, 0xa8a5, 0xa8ad, 0xa8d1, 0xa8d3, 0xa8e4, 0xa8fc, 0xa9c0, 0xa9d2, 0xa9f3,
- 0xaa6b, 0xaaba, 0xaabe, 0xaacc, 0xaafc, 0xac47, 0xac4f, 0xacb0, 0xacd2, 0xad59,
- 0xaec9, 0xafe0, 0xb0ea, 0xb16f, 0xb2b3, 0xb2c4, 0xb36f, 0xb44c, 0xb44e, 0xb54c,
- 0xb5a5, 0xb5bd, 0xb5d0, 0xb5d8, 0xb671, 0xb7ed, 0xb867, 0xb944, 0xbad8, 0xbb44,
- 0xbba1, 0xbdd1, 0xc2c4, 0xc3b9, 0xc440, 0xc45f};
-
- boolean nextChar(iteratedChar it, CharsetDetector det) {
- it.index = it.nextIndex;
- it.error = false;
- int firstByte;
- firstByte = it.charValue = it.nextByte(det);
- if (firstByte < 0) {
- return false;
- }
-
- if (firstByte <= 0x7f || firstByte==0xff) {
- // single byte character.
- return true;
- }
-
- int secondByte = it.nextByte(det);
- if (secondByte < 0) {
- return false;
- }
- it.charValue = (it.charValue << 8) | secondByte;
-
- if (secondByte < 0x40 ||
- secondByte ==0x7f ||
- secondByte == 0xff) {
- it.error = true;
- }
- return true;
- }
-
- int match(CharsetDetector det) {
- return match(det, commonChars);
- }
-
- String getName() {
- return "Big5";
- }
-
-
- public String getLanguage()
- {
- return "zh";
- }
- }
-
-
- /**
- * EUC charset recognizers. One abstract class that provides the common function
- * for getting the next character according to the EUC encoding scheme,
- * and nested derived classes for EUC_KR, EUC_JP, EUC_CN.
- *
- */
- abstract static class CharsetRecog_euc extends CharsetRecog_mbcs {
-
- /*
- * (non-Javadoc)
- * Get the next character value for EUC based encodings.
- * Character "value" is simply the raw bytes that make up the character
- * packed into an int.
- */
- boolean nextChar(iteratedChar it, CharsetDetector det) {
- it.index = it.nextIndex;
- it.error = false;
- int firstByte = 0;
- int secondByte = 0;
- int thirdByte = 0;
- //int fourthByte = 0;
-
- buildChar: {
- firstByte = it.charValue = it.nextByte(det);
- if (firstByte < 0) {
- // Ran off the end of the input data
- it.done = true;
- break buildChar;
- }
- if (firstByte <= 0x8d) {
- // single byte char
- break buildChar;
- }
-
- secondByte = it.nextByte(det);
- it.charValue = (it.charValue << 8) | secondByte;
-
- if (firstByte >= 0xA1 && firstByte <= 0xfe) {
- // Two byte Char
- if (secondByte < 0xa1) {
- it.error = true;
- }
- break buildChar;
- }
- if (firstByte == 0x8e) {
- // Code Set 2.
- // In EUC-JP, total char size is 2 bytes, only one byte of actual char value.
- // In EUC-TW, total char size is 4 bytes, three bytes contribute to char value.
- // We don't know which we've got.
- // Treat it like EUC-JP. If the data really was EUC-TW, the following two
- // bytes will look like a well formed 2 byte char.
- if (secondByte < 0xa1) {
- it.error = true;
- }
- break buildChar;
- }
-
- if (firstByte == 0x8f) {
- // Code set 3.
- // Three byte total char size, two bytes of actual char value.
- thirdByte = it.nextByte(det);
- it.charValue = (it.charValue << 8) | thirdByte;
- if (thirdByte < 0xa1) {
- it.error = true;
- }
- }
- }
-
- return (it.done == false);
- }
-
- /**
- * The charset recognize for EUC-JP. A singleton instance of this class
- * is created and kept by the public CharsetDetector class
- */
- static class CharsetRecog_euc_jp extends CharsetRecog_euc {
- static int [] commonChars =
- // TODO: This set of data comes from the character frequency-
- // of-occurence analysis tool. The data needs to be moved
- // into a resource and loaded from there.
- {0xa1a1, 0xa1a2, 0xa1a3, 0xa1a6, 0xa1bc, 0xa1ca, 0xa1cb, 0xa1d6, 0xa1d7, 0xa4a2,
- 0xa4a4, 0xa4a6, 0xa4a8, 0xa4aa, 0xa4ab, 0xa4ac, 0xa4ad, 0xa4af, 0xa4b1, 0xa4b3,
- 0xa4b5, 0xa4b7, 0xa4b9, 0xa4bb, 0xa4bd, 0xa4bf, 0xa4c0, 0xa4c1, 0xa4c3, 0xa4c4,
- 0xa4c6, 0xa4c7, 0xa4c8, 0xa4c9, 0xa4ca, 0xa4cb, 0xa4ce, 0xa4cf, 0xa4d0, 0xa4de,
- 0xa4df, 0xa4e1, 0xa4e2, 0xa4e4, 0xa4e8, 0xa4e9, 0xa4ea, 0xa4eb, 0xa4ec, 0xa4ef,
- 0xa4f2, 0xa4f3, 0xa5a2, 0xa5a3, 0xa5a4, 0xa5a6, 0xa5a7, 0xa5aa, 0xa5ad, 0xa5af,
- 0xa5b0, 0xa5b3, 0xa5b5, 0xa5b7, 0xa5b8, 0xa5b9, 0xa5bf, 0xa5c3, 0xa5c6, 0xa5c7,
- 0xa5c8, 0xa5c9, 0xa5cb, 0xa5d0, 0xa5d5, 0xa5d6, 0xa5d7, 0xa5de, 0xa5e0, 0xa5e1,
- 0xa5e5, 0xa5e9, 0xa5ea, 0xa5eb, 0xa5ec, 0xa5ed, 0xa5f3, 0xb8a9, 0xb9d4, 0xbaee,
- 0xbbc8, 0xbef0, 0xbfb7, 0xc4ea, 0xc6fc, 0xc7bd, 0xcab8, 0xcaf3, 0xcbdc, 0xcdd1};
- String getName() {
- return "EUC-JP";
- }
-
- int match(CharsetDetector det) {
- return match(det, commonChars);
- }
-
- public String getLanguage()
- {
- return "ja";
- }
- }
-
- /**
- * The charset recognize for EUC-KR. A singleton instance of this class
- * is created and kept by the public CharsetDetector class
- */
- static class CharsetRecog_euc_kr extends CharsetRecog_euc {
- static int [] commonChars =
- // TODO: This set of data comes from the character frequency-
- // of-occurence analysis tool. The data needs to be moved
- // into a resource and loaded from there.
- {0xb0a1, 0xb0b3, 0xb0c5, 0xb0cd, 0xb0d4, 0xb0e6, 0xb0ed, 0xb0f8, 0xb0fa, 0xb0fc,
- 0xb1b8, 0xb1b9, 0xb1c7, 0xb1d7, 0xb1e2, 0xb3aa, 0xb3bb, 0xb4c2, 0xb4cf, 0xb4d9,
- 0xb4eb, 0xb5a5, 0xb5b5, 0xb5bf, 0xb5c7, 0xb5e9, 0xb6f3, 0xb7af, 0xb7c2, 0xb7ce,
- 0xb8a6, 0xb8ae, 0xb8b6, 0xb8b8, 0xb8bb, 0xb8e9, 0xb9ab, 0xb9ae, 0xb9cc, 0xb9ce,
- 0xb9fd, 0xbab8, 0xbace, 0xbad0, 0xbaf1, 0xbbe7, 0xbbf3, 0xbbfd, 0xbcad, 0xbcba,
- 0xbcd2, 0xbcf6, 0xbdba, 0xbdc0, 0xbdc3, 0xbdc5, 0xbec6, 0xbec8, 0xbedf, 0xbeee,
- 0xbef8, 0xbefa, 0xbfa1, 0xbfa9, 0xbfc0, 0xbfe4, 0xbfeb, 0xbfec, 0xbff8, 0xc0a7,
- 0xc0af, 0xc0b8, 0xc0ba, 0xc0bb, 0xc0bd, 0xc0c7, 0xc0cc, 0xc0ce, 0xc0cf, 0xc0d6,
- 0xc0da, 0xc0e5, 0xc0fb, 0xc0fc, 0xc1a4, 0xc1a6, 0xc1b6, 0xc1d6, 0xc1df, 0xc1f6,
- 0xc1f8, 0xc4a1, 0xc5cd, 0xc6ae, 0xc7cf, 0xc7d1, 0xc7d2, 0xc7d8, 0xc7e5, 0xc8ad};
-
- String getName() {
- return "EUC-KR";
- }
-
- int match(CharsetDetector det) {
- return match(det, commonChars);
- }
-
- public String getLanguage()
- {
- return "ko";
- }
- }
- }
-
- /**
- *
- * GB-18030 recognizer. Uses simplified Chinese statistics.
- *
- */
- static class CharsetRecog_gb_18030 extends CharsetRecog_mbcs {
-
- /*
- * (non-Javadoc)
- * Get the next character value for EUC based encodings.
- * Character "value" is simply the raw bytes that make up the character
- * packed into an int.
- */
- boolean nextChar(iteratedChar it, CharsetDetector det) {
- it.index = it.nextIndex;
- it.error = false;
- int firstByte = 0;
- int secondByte = 0;
- int thirdByte = 0;
- int fourthByte = 0;
-
- buildChar: {
- firstByte = it.charValue = it.nextByte(det);
-
- if (firstByte < 0) {
- // Ran off the end of the input data
- it.done = true;
- break buildChar;
- }
-
- if (firstByte <= 0x80) {
- // single byte char
- break buildChar;
- }
-
- secondByte = it.nextByte(det);
- it.charValue = (it.charValue << 8) | secondByte;
-
- if (firstByte >= 0x81 && firstByte <= 0xFE) {
- // Two byte Char
- if ((secondByte >= 0x40 && secondByte <= 0x7E) || (secondByte >=80 && secondByte <=0xFE)) {
- break buildChar;
- }
-
- // Four byte char
- if (secondByte >= 0x30 && secondByte <= 0x39) {
- thirdByte = it.nextByte(det);
-
- if (thirdByte >= 0x81 && thirdByte <= 0xFE) {
- fourthByte = it.nextByte(det);
-
- if (fourthByte >= 0x30 && fourthByte <= 0x39) {
- it.charValue = (it.charValue << 16) | (thirdByte << 8) | fourthByte;
- break buildChar;
- }
- }
- }
-
- it.error = true;
- break buildChar;
- }
- }
-
- return (it.done == false);
- }
-
- static int [] commonChars =
- // TODO: This set of data comes from the character frequency-
- // of-occurence analysis tool. The data needs to be moved
- // into a resource and loaded from there.
- {0xa1a1, 0xa1a2, 0xa1a3, 0xa1a4, 0xa1b0, 0xa1b1, 0xa1f1, 0xa1f3, 0xa3a1, 0xa3ac,
- 0xa3ba, 0xb1a8, 0xb1b8, 0xb1be, 0xb2bb, 0xb3c9, 0xb3f6, 0xb4f3, 0xb5bd, 0xb5c4,
- 0xb5e3, 0xb6af, 0xb6d4, 0xb6e0, 0xb7a2, 0xb7a8, 0xb7bd, 0xb7d6, 0xb7dd, 0xb8b4,
- 0xb8df, 0xb8f6, 0xb9ab, 0xb9c9, 0xb9d8, 0xb9fa, 0xb9fd, 0xbacd, 0xbba7, 0xbbd6,
- 0xbbe1, 0xbbfa, 0xbcbc, 0xbcdb, 0xbcfe, 0xbdcc, 0xbecd, 0xbedd, 0xbfb4, 0xbfc6,
- 0xbfc9, 0xc0b4, 0xc0ed, 0xc1cb, 0xc2db, 0xc3c7, 0xc4dc, 0xc4ea, 0xc5cc, 0xc6f7,
- 0xc7f8, 0xc8ab, 0xc8cb, 0xc8d5, 0xc8e7, 0xc9cf, 0xc9fa, 0xcab1, 0xcab5, 0xcac7,
- 0xcad0, 0xcad6, 0xcaf5, 0xcafd, 0xccec, 0xcdf8, 0xceaa, 0xcec4, 0xced2, 0xcee5,
- 0xcfb5, 0xcfc2, 0xcfd6, 0xd0c2, 0xd0c5, 0xd0d0, 0xd0d4, 0xd1a7, 0xd2aa, 0xd2b2,
- 0xd2b5, 0xd2bb, 0xd2d4, 0xd3c3, 0xd3d0, 0xd3fd, 0xd4c2, 0xd4da, 0xd5e2, 0xd6d0};
-
-
- String getName() {
- return "GB18030";
- }
-
- int match(CharsetDetector det) {
- return match(det, commonChars);
- }
-
- public String getLanguage()
- {
- return "zh";
- }
- }
-
-
+
+ /**
+ * Get the next character (however many bytes it is) from the input data
+ * Subclasses for specific charset encodings must implement this function
+ * to get characters according to the rules of their encoding scheme.
+ * <p/>
+ * This function is not a method of class iteratedChar only because
+ * that would require a lot of extra derived classes, which is awkward.
+ *
+ * @param it The iteratedChar "struct" into which the returned char is placed.
+ * @param det The charset detector, which is needed to get at the input byte data
+ * being iterated over.
+ * @return True if a character was returned, false at end of input.
+ */
+ abstract boolean nextChar(iteratedChar it, CharsetDetector det);
+
+ // "Character" iterated character class.
+ // Recognizers for specific mbcs encodings make their "characters" available
+ // by providing a nextChar() function that fills in an instance of iteratedChar
+ // with the next char from the input.
+ // The returned characters are not converted to Unicode, but remain as the raw
+ // bytes (concatenated into an int) from the codepage data.
+ //
+ // For Asian charsets, use the raw input rather than the input that has been
+ // stripped of markup. Detection only considers multi-byte chars, effectively
+ // stripping markup anyway, and double byte chars do occur in markup too.
+ //
+ static class iteratedChar {
+ int charValue = 0; // 1-4 bytes from the raw input data
+ int index = 0;
+ int nextIndex = 0;
+ boolean error = false;
+ boolean done = false;
+
+ void reset() {
+ charValue = 0;
+ index = -1;
+ nextIndex = 0;
+ error = false;
+ done = false;
+ }
+
+ int nextByte(CharsetDetector det) {
+ if (nextIndex >= det.fRawLength) {
+ done = true;
+ return -1;
+ }
+ int byteValue = (int) det.fRawInput[nextIndex++] & 0x00ff;
+ return byteValue;
+ }
+ }
+
+ /**
+ * Shift-JIS charset recognizer.
+ */
+ static class CharsetRecog_sjis extends CharsetRecog_mbcs {
+ static int[] commonChars =
+ // TODO: This set of data comes from the character frequency-
+ // of-occurence analysis tool. The data needs to be moved
+ // into a resource and loaded from there.
+ {0x8140, 0x8141, 0x8142, 0x8145, 0x815b, 0x8169, 0x816a, 0x8175, 0x8176, 0x82a0,
+ 0x82a2, 0x82a4, 0x82a9, 0x82aa, 0x82ab, 0x82ad, 0x82af, 0x82b1, 0x82b3, 0x82b5,
+ 0x82b7, 0x82bd, 0x82be, 0x82c1, 0x82c4, 0x82c5, 0x82c6, 0x82c8, 0x82c9, 0x82cc,
+ 0x82cd, 0x82dc, 0x82e0, 0x82e7, 0x82e8, 0x82e9, 0x82ea, 0x82f0, 0x82f1, 0x8341,
+ 0x8343, 0x834e, 0x834f, 0x8358, 0x835e, 0x8362, 0x8367, 0x8375, 0x8376, 0x8389,
+ 0x838a, 0x838b, 0x838d, 0x8393, 0x8e96, 0x93fa, 0x95aa};
+
+ boolean nextChar(iteratedChar it, CharsetDetector det) {
+ it.index = it.nextIndex;
+ it.error = false;
+ int firstByte;
+ firstByte = it.charValue = it.nextByte(det);
+ if (firstByte < 0) {
+ return false;
+ }
+
+ if (firstByte <= 0x7f || (firstByte > 0xa0 && firstByte <= 0xdf)) {
+ return true;
+ }
+
+ int secondByte = it.nextByte(det);
+ if (secondByte < 0) {
+ return false;
+ }
+ it.charValue = (firstByte << 8) | secondByte;
+ if (!((secondByte >= 0x40 && secondByte <= 0x7f) || (secondByte >= 0x80 && secondByte <= 0xff))) {
+ // Illegal second byte value.
+ it.error = true;
+ }
+ return true;
+ }
+
+ int match(CharsetDetector det) {
+ return match(det, commonChars);
+ }
+
+ String getName() {
+ return "Shift_JIS";
+ }
+
+ public String getLanguage() {
+ return "ja";
+ }
+
+
+ }
+
+
+ /**
+ * Big5 charset recognizer.
+ */
+ static class CharsetRecog_big5 extends CharsetRecog_mbcs {
+ static int[] commonChars =
+ // TODO: This set of data comes from the character frequency-
+ // of-occurence analysis tool. The data needs to be moved
+ // into a resource and loaded from there.
+ {0xa140, 0xa141, 0xa142, 0xa143, 0xa147, 0xa149, 0xa175, 0xa176, 0xa440, 0xa446,
+ 0xa447, 0xa448, 0xa451, 0xa454, 0xa457, 0xa464, 0xa46a, 0xa46c, 0xa477, 0xa4a3,
+ 0xa4a4, 0xa4a7, 0xa4c1, 0xa4ce, 0xa4d1, 0xa4df, 0xa4e8, 0xa4fd, 0xa540, 0xa548,
+ 0xa558, 0xa569, 0xa5cd, 0xa5e7, 0xa657, 0xa661, 0xa662, 0xa668, 0xa670, 0xa6a8,
+ 0xa6b3, 0xa6b9, 0xa6d3, 0xa6db, 0xa6e6, 0xa6f2, 0xa740, 0xa751, 0xa759, 0xa7da,
+ 0xa8a3, 0xa8a5, 0xa8ad, 0xa8d1, 0xa8d3, 0xa8e4, 0xa8fc, 0xa9c0, 0xa9d2, 0xa9f3,
+ 0xaa6b, 0xaaba, 0xaabe, 0xaacc, 0xaafc, 0xac47, 0xac4f, 0xacb0, 0xacd2, 0xad59,
+ 0xaec9, 0xafe0, 0xb0ea, 0xb16f, 0xb2b3, 0xb2c4, 0xb36f, 0xb44c, 0xb44e, 0xb54c,
+ 0xb5a5, 0xb5bd, 0xb5d0, 0xb5d8, 0xb671, 0xb7ed, 0xb867, 0xb944, 0xbad8, 0xbb44,
+ 0xbba1, 0xbdd1, 0xc2c4, 0xc3b9, 0xc440, 0xc45f};
+
+ boolean nextChar(iteratedChar it, CharsetDetector det) {
+ it.index = it.nextIndex;
+ it.error = false;
+ int firstByte;
+ firstByte = it.charValue = it.nextByte(det);
+ if (firstByte < 0) {
+ return false;
+ }
+
+ if (firstByte <= 0x7f || firstByte == 0xff) {
+ // single byte character.
+ return true;
+ }
+
+ int secondByte = it.nextByte(det);
+ if (secondByte < 0) {
+ return false;
+ }
+ it.charValue = (it.charValue << 8) | secondByte;
+
+ if (secondByte < 0x40 ||
+ secondByte == 0x7f ||
+ secondByte == 0xff) {
+ it.error = true;
+ }
+ return true;
+ }
+
+ int match(CharsetDetector det) {
+ return match(det, commonChars);
+ }
+
+ String getName() {
+ return "Big5";
+ }
+
+
+ public String getLanguage() {
+ return "zh";
+ }
+ }
+
+
+ /**
+ * EUC charset recognizers. One abstract class that provides the common function
+ * for getting the next character according to the EUC encoding scheme,
+ * and nested derived classes for EUC_KR, EUC_JP, EUC_CN.
+ */
+ abstract static class CharsetRecog_euc extends CharsetRecog_mbcs {
+
+ /*
+ * (non-Javadoc)
+ * Get the next character value for EUC based encodings.
+ * Character "value" is simply the raw bytes that make up the character
+ * packed into an int.
+ */
+ boolean nextChar(iteratedChar it, CharsetDetector det) {
+ it.index = it.nextIndex;
+ it.error = false;
+ int firstByte = 0;
+ int secondByte = 0;
+ int thirdByte = 0;
+ //int fourthByte = 0;
+
+ buildChar:
+ {
+ firstByte = it.charValue = it.nextByte(det);
+ if (firstByte < 0) {
+ // Ran off the end of the input data
+ it.done = true;
+ break buildChar;
+ }
+ if (firstByte <= 0x8d) {
+ // single byte char
+ break buildChar;
+ }
+
+ secondByte = it.nextByte(det);
+ it.charValue = (it.charValue << 8) | secondByte;
+
+ if (firstByte >= 0xA1 && firstByte <= 0xfe) {
+ // Two byte Char
+ if (secondByte < 0xa1) {
+ it.error = true;
+ }
+ break buildChar;
+ }
+ if (firstByte == 0x8e) {
+ // Code Set 2.
+ // In EUC-JP, total char size is 2 bytes, only one byte of actual char value.
+ // In EUC-TW, total char size is 4 bytes, three bytes contribute to char value.
+ // We don't know which we've got.
+ // Treat it like EUC-JP. If the data really was EUC-TW, the following two
+ // bytes will look like a well formed 2 byte char.
+ if (secondByte < 0xa1) {
+ it.error = true;
+ }
+ break buildChar;
+ }
+
+ if (firstByte == 0x8f) {
+ // Code set 3.
+ // Three byte total char size, two bytes of actual char value.
+ thirdByte = it.nextByte(det);
+ it.charValue = (it.charValue << 8) | thirdByte;
+ if (thirdByte < 0xa1) {
+ it.error = true;
+ }
+ }
+ }
+
+ return (it.done == false);
+ }
+
+ /**
+ * The charset recognize for EUC-JP. A singleton instance of this class
+ * is created and kept by the public CharsetDetector class
+ */
+ static class CharsetRecog_euc_jp extends CharsetRecog_euc {
+ static int[] commonChars =
+ // TODO: This set of data comes from the character frequency-
+ // of-occurence analysis tool. The data needs to be moved
+ // into a resource and loaded from there.
+ {0xa1a1, 0xa1a2, 0xa1a3, 0xa1a6, 0xa1bc, 0xa1ca, 0xa1cb, 0xa1d6, 0xa1d7, 0xa4a2,
+ 0xa4a4, 0xa4a6, 0xa4a8, 0xa4aa, 0xa4ab, 0xa4ac, 0xa4ad, 0xa4af, 0xa4b1, 0xa4b3,
+ 0xa4b5, 0xa4b7, 0xa4b9, 0xa4bb, 0xa4bd, 0xa4bf, 0xa4c0, 0xa4c1, 0xa4c3, 0xa4c4,
+ 0xa4c6, 0xa4c7, 0xa4c8, 0xa4c9, 0xa4ca, 0xa4cb, 0xa4ce, 0xa4cf, 0xa4d0, 0xa4de,
+ 0xa4df, 0xa4e1, 0xa4e2, 0xa4e4, 0xa4e8, 0xa4e9, 0xa4ea, 0xa4eb, 0xa4ec, 0xa4ef,
+ 0xa4f2, 0xa4f3, 0xa5a2, 0xa5a3, 0xa5a4, 0xa5a6, 0xa5a7, 0xa5aa, 0xa5ad, 0xa5af,
+ 0xa5b0, 0xa5b3, 0xa5b5, 0xa5b7, 0xa5b8, 0xa5b9, 0xa5bf, 0xa5c3, 0xa5c6, 0xa5c7,
+ 0xa5c8, 0xa5c9, 0xa5cb, 0xa5d0, 0xa5d5, 0xa5d6, 0xa5d7, 0xa5de, 0xa5e0, 0xa5e1,
+ 0xa5e5, 0xa5e9, 0xa5ea, 0xa5eb, 0xa5ec, 0xa5ed, 0xa5f3, 0xb8a9, 0xb9d4, 0xbaee,
+ 0xbbc8, 0xbef0, 0xbfb7, 0xc4ea, 0xc6fc, 0xc7bd, 0xcab8, 0xcaf3, 0xcbdc, 0xcdd1};
+
+ String getName() {
+ return "EUC-JP";
+ }
+
+ int match(CharsetDetector det) {
+ return match(det, commonChars);
+ }
+
+ public String getLanguage() {
+ return "ja";
+ }
+ }
+
+ /**
+ * The charset recognize for EUC-KR. A singleton instance of this class
+ * is created and kept by the public CharsetDetector class
+ */
+ static class CharsetRecog_euc_kr extends CharsetRecog_euc {
+ static int[] commonChars =
+ // TODO: This set of data comes from the character frequency-
+ // of-occurence analysis tool. The data needs to be moved
+ // into a resource and loaded from there.
+ {0xb0a1, 0xb0b3, 0xb0c5, 0xb0cd, 0xb0d4, 0xb0e6, 0xb0ed, 0xb0f8, 0xb0fa, 0xb0fc,
+ 0xb1b8, 0xb1b9, 0xb1c7, 0xb1d7, 0xb1e2, 0xb3aa, 0xb3bb, 0xb4c2, 0xb4cf, 0xb4d9,
+ 0xb4eb, 0xb5a5, 0xb5b5, 0xb5bf, 0xb5c7, 0xb5e9, 0xb6f3, 0xb7af, 0xb7c2, 0xb7ce,
+ 0xb8a6, 0xb8ae, 0xb8b6, 0xb8b8, 0xb8bb, 0xb8e9, 0xb9ab, 0xb9ae, 0xb9cc, 0xb9ce,
+ 0xb9fd, 0xbab8, 0xbace, 0xbad0, 0xbaf1, 0xbbe7, 0xbbf3, 0xbbfd, 0xbcad, 0xbcba,
+ 0xbcd2, 0xbcf6, 0xbdba, 0xbdc0, 0xbdc3, 0xbdc5, 0xbec6, 0xbec8, 0xbedf, 0xbeee,
+ 0xbef8, 0xbefa, 0xbfa1, 0xbfa9, 0xbfc0, 0xbfe4, 0xbfeb, 0xbfec, 0xbff8, 0xc0a7,
+ 0xc0af, 0xc0b8, 0xc0ba, 0xc0bb, 0xc0bd, 0xc0c7, 0xc0cc, 0xc0ce, 0xc0cf, 0xc0d6,
+ 0xc0da, 0xc0e5, 0xc0fb, 0xc0fc, 0xc1a4, 0xc1a6, 0xc1b6, 0xc1d6, 0xc1df, 0xc1f6,
+ 0xc1f8, 0xc4a1, 0xc5cd, 0xc6ae, 0xc7cf, 0xc7d1, 0xc7d2, 0xc7d8, 0xc7e5, 0xc8ad};
+
+ String getName() {
+ return "EUC-KR";
+ }
+
+ int match(CharsetDetector det) {
+ return match(det, commonChars);
+ }
+
+ public String getLanguage() {
+ return "ko";
+ }
+ }
+ }
+
+ /**
+ * GB-18030 recognizer. Uses simplified Chinese statistics.
+ */
+ static class CharsetRecog_gb_18030 extends CharsetRecog_mbcs {
+
+ static int[] commonChars =
+ // TODO: This set of data comes from the character frequency-
+ // of-occurence analysis tool. The data needs to be moved
+ // into a resource and loaded from there.
+ {0xa1a1, 0xa1a2, 0xa1a3, 0xa1a4, 0xa1b0, 0xa1b1, 0xa1f1, 0xa1f3, 0xa3a1, 0xa3ac,
+ 0xa3ba, 0xb1a8, 0xb1b8, 0xb1be, 0xb2bb, 0xb3c9, 0xb3f6, 0xb4f3, 0xb5bd, 0xb5c4,
+ 0xb5e3, 0xb6af, 0xb6d4, 0xb6e0, 0xb7a2, 0xb7a8, 0xb7bd, 0xb7d6, 0xb7dd, 0xb8b4,
+ 0xb8df, 0xb8f6, 0xb9ab, 0xb9c9, 0xb9d8, 0xb9fa, 0xb9fd, 0xbacd, 0xbba7, 0xbbd6,
+ 0xbbe1, 0xbbfa, 0xbcbc, 0xbcdb, 0xbcfe, 0xbdcc, 0xbecd, 0xbedd, 0xbfb4, 0xbfc6,
+ 0xbfc9, 0xc0b4, 0xc0ed, 0xc1cb, 0xc2db, 0xc3c7, 0xc4dc, 0xc4ea, 0xc5cc, 0xc6f7,
+ 0xc7f8, 0xc8ab, 0xc8cb, 0xc8d5, 0xc8e7, 0xc9cf, 0xc9fa, 0xcab1, 0xcab5, 0xcac7,
+ 0xcad0, 0xcad6, 0xcaf5, 0xcafd, 0xccec, 0xcdf8, 0xceaa, 0xcec4, 0xced2, 0xcee5,
+ 0xcfb5, 0xcfc2, 0xcfd6, 0xd0c2, 0xd0c5, 0xd0d0, 0xd0d4, 0xd1a7, 0xd2aa, 0xd2b2,
+ 0xd2b5, 0xd2bb, 0xd2d4, 0xd3c3, 0xd3d0, 0xd3fd, 0xd4c2, 0xd4da, 0xd5e2, 0xd6d0};
+
+ /*
+ * (non-Javadoc)
+ * Get the next character value for EUC based encodings.
+ * Character "value" is simply the raw bytes that make up the character
+ * packed into an int.
+ */
+ boolean nextChar(iteratedChar it, CharsetDetector det) {
+ it.index = it.nextIndex;
+ it.error = false;
+ int firstByte = 0;
+ int secondByte = 0;
+ int thirdByte = 0;
+ int fourthByte = 0;
+
+ buildChar:
+ {
+ firstByte = it.charValue = it.nextByte(det);
+
+ if (firstByte < 0) {
+ // Ran off the end of the input data
+ it.done = true;
+ break buildChar;
+ }
+
+ if (firstByte <= 0x80) {
+ // single byte char
+ break buildChar;
+ }
+
+ secondByte = it.nextByte(det);
+ it.charValue = (it.charValue << 8) | secondByte;
+
+ if (firstByte >= 0x81 && firstByte <= 0xFE) {
+ // Two byte Char
+ if ((secondByte >= 0x40 && secondByte <= 0x7E) || (secondByte >= 80 && secondByte <= 0xFE)) {
+ break buildChar;
+ }
+
+ // Four byte char
+ if (secondByte >= 0x30 && secondByte <= 0x39) {
+ thirdByte = it.nextByte(det);
+
+ if (thirdByte >= 0x81 && thirdByte <= 0xFE) {
+ fourthByte = it.nextByte(det);
+
+ if (fourthByte >= 0x30 && fourthByte <= 0x39) {
+ it.charValue = (it.charValue << 16) | (thirdByte << 8) | fourthByte;
+ break buildChar;
+ }
+ }
+ }
+
+ it.error = true;
+ break buildChar;
+ }
+ }
+
+ return (it.done == false);
+ }
+
+ String getName() {
+ return "GB18030";
+ }
+
+ int match(CharsetDetector det) {
+ return match(det, commonChars);
+ }
+
+ public String getLanguage() {
+ return "zh";
+ }
+ }
+
+
}