--- /dev/null
+/*\r
+ * Copyright 2001-2004 Unicode, Inc.\r
+ * \r
+ * Disclaimer\r
+ * \r
+ * This source code is provided as is by Unicode, Inc. No claims are\r
+ * made as to fitness for any particular purpose. No warranties of any\r
+ * kind are expressed or implied. The recipient agrees to determine\r
+ * applicability of information provided. If this file has been\r
+ * purchased on magnetic or optical media from Unicode, Inc., the\r
+ * sole remedy for any claim will be exchange of defective media\r
+ * within 90 days of receipt.\r
+ * \r
+ * Limitations on Rights to Redistribute This Code\r
+ * \r
+ * Unicode, Inc. hereby grants the right to freely use the information\r
+ * supplied in this file in the creation of products supporting the\r
+ * Unicode Standard, and to make copies of this file in any form\r
+ * for internal or external distribution as long as this notice\r
+ * remains attached.\r
+ */\r
+\r
+/* ---------------------------------------------------------------------\r
+\r
+ Conversions between UTF32, UTF-16, and UTF-8. Source code file.\r
+ Author: Mark E. Davis, 1994.\r
+ Rev History: Rick McGowan, fixes & updates May 2001.\r
+ Sept 2001: fixed const & error conditions per\r
+ mods suggested by S. Parent & A. Lillich.\r
+ June 2002: Tim Dodd added detection and handling of incomplete\r
+ source sequences, enhanced error detection, added casts\r
+ to eliminate compiler warnings.\r
+ July 2003: slight mods to back out aggressive FFFE detection.\r
+ Jan 2004: updated switches in from-UTF8 conversions.\r
+ Oct 2004: updated to use UNI_MAX_LEGAL_UTF32 in UTF-32 conversions.\r
+\r
+ See the header file "ConvertUTF.h" for complete documentation.\r
+\r
+------------------------------------------------------------------------ */\r
+\r
+\r
+#include "antlr3convertutf.h"\r
+\r
+#ifdef CVTUTF_DEBUG\r
+#include <stdio.h>\r
+#endif\r
+\r
+static const int halfShift = 10; /* used for shifting by 10 bits */\r
+\r
+static const UTF32 halfBase = 0x0010000UL;\r
+static const UTF32 halfMask = 0x3FFUL;\r
+\r
+#define UNI_SUR_HIGH_START (UTF32)0xD800\r
+#define UNI_SUR_HIGH_END (UTF32)0xDBFF\r
+#define UNI_SUR_LOW_START (UTF32)0xDC00\r
+#define UNI_SUR_LOW_END (UTF32)0xDFFF\r
+#define false 0\r
+#define true 1\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+ConversionResult ConvertUTF32toUTF16 (\r
+ const UTF32** sourceStart, const UTF32* sourceEnd, \r
+ UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {\r
+ ConversionResult result = conversionOK;\r
+ const UTF32* source = *sourceStart;\r
+ UTF16* target = *targetStart;\r
+ while (source < sourceEnd) {\r
+ UTF32 ch;\r
+ if (target >= targetEnd) {\r
+ result = targetExhausted; break;\r
+ }\r
+ ch = *source++;\r
+ if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */\r
+ /* UTF-16 surrogate values are illegal in UTF-32; 0xffff or 0xfffe are both reserved values */\r
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {\r
+ if (flags == strictConversion) {\r
+ --source; /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ } else {\r
+ *target++ = UNI_REPLACEMENT_CHAR;\r
+ }\r
+ } else {\r
+ *target++ = (UTF16)ch; /* normal case */\r
+ }\r
+ } else if (ch > UNI_MAX_LEGAL_UTF32) {\r
+ if (flags == strictConversion) {\r
+ result = sourceIllegal;\r
+ } else {\r
+ *target++ = UNI_REPLACEMENT_CHAR;\r
+ }\r
+ } else {\r
+ /* target is a character in range 0xFFFF - 0x10FFFF. */\r
+ if (target + 1 >= targetEnd) {\r
+ --source; /* Back up source pointer! */\r
+ result = targetExhausted; break;\r
+ }\r
+ ch -= halfBase;\r
+ *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);\r
+ *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);\r
+ }\r
+ }\r
+ *sourceStart = source;\r
+ *targetStart = target;\r
+ return result;\r
+}\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+ConversionResult ConvertUTF16toUTF32 (\r
+ const UTF16** sourceStart, const UTF16* sourceEnd, \r
+ UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {\r
+ ConversionResult result = conversionOK;\r
+ const UTF16* source = *sourceStart;\r
+ UTF32* target = *targetStart;\r
+ UTF32 ch, ch2;\r
+ while (source < sourceEnd) {\r
+ const UTF16* oldSource = source; /* In case we have to back up because of target overflow. */\r
+ ch = *source++;\r
+ /* If we have a surrogate pair, convert to UTF32 first. */\r
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {\r
+ /* If the 16 bits following the high surrogate are in the source buffer... */\r
+ if (source < sourceEnd) {\r
+ ch2 = *source;\r
+ /* If it's a low surrogate, convert to UTF32. */\r
+ if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {\r
+ ch = ((ch - UNI_SUR_HIGH_START) << halfShift)\r
+ + (ch2 - UNI_SUR_LOW_START) + halfBase;\r
+ ++source;\r
+ } else if (flags == strictConversion) { /* it's an unpaired high surrogate */\r
+ --source; /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ }\r
+ } else { /* We don't have the 16 bits following the high surrogate. */\r
+ --source; /* return to the high surrogate */\r
+ result = sourceExhausted;\r
+ break;\r
+ }\r
+ } else if (flags == strictConversion) {\r
+ /* UTF-16 surrogate values are illegal in UTF-32 */\r
+ if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {\r
+ --source; /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ }\r
+ }\r
+ if (target >= targetEnd) {\r
+ source = oldSource; /* Back up source pointer! */\r
+ result = targetExhausted; break;\r
+ }\r
+ *target++ = ch;\r
+ }\r
+ *sourceStart = source;\r
+ *targetStart = target;\r
+#ifdef CVTUTF_DEBUG\r
+if (result == sourceIllegal) {\r
+ ANTLR3_FPRINTF(stderr, "ConvertUTF16toUTF32 illegal seq 0x%04x,%04x\n", ch, ch2);\r
+ fflush(stderr);\r
+}\r
+#endif\r
+ return result;\r
+}\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+/*\r
+ * Index into the table below with the first byte of a UTF-8 sequence to\r
+ * get the number of trailing bytes that are supposed to follow it.\r
+ * Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is\r
+ * left as-is for anyone who may want to do such conversion, which was\r
+ * allowed in earlier algorithms.\r
+ */\r
+static const char trailingBytesForUTF8[256] = {\r
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,\r
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,\r
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,\r
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,\r
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,\r
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,\r
+ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,\r
+ 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5\r
+};\r
+\r
+/*\r
+ * Magic values subtracted from a buffer value during UTF8 conversion.\r
+ * This table contains as many values as there might be trailing bytes\r
+ * in a UTF-8 sequence.\r
+ */\r
+static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, \r
+ 0x03C82080UL, 0xFA082080UL, 0x82082080UL };\r
+\r
+/*\r
+ * Once the bits are split out into bytes of UTF-8, this is a mask OR-ed\r
+ * into the first byte, depending on how many bytes follow. There are\r
+ * as many entries in this table as there are UTF-8 sequence types.\r
+ * (I.e., one byte sequence, two byte... etc.). Remember that sequencs\r
+ * for *legal* UTF-8 will be 4 or fewer bytes total.\r
+ */\r
+static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+/* The interface converts a whole buffer to avoid function-call overhead.\r
+ * Constants have been gathered. Loops & conditionals have been removed as\r
+ * much as possible for efficiency, in favor of drop-through switches.\r
+ * (See "Note A" at the bottom of the file for equivalent code.)\r
+ * If your compiler supports it, the "isLegalUTF8" call can be turned\r
+ * into an inline function.\r
+ */\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+ConversionResult ConvertUTF16toUTF8 (\r
+ const UTF16** sourceStart, const UTF16* sourceEnd, \r
+ UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {\r
+ ConversionResult result = conversionOK;\r
+ const UTF16* source = *sourceStart;\r
+ UTF8* target = *targetStart;\r
+ while (source < sourceEnd) {\r
+ UTF32 ch;\r
+ unsigned short bytesToWrite = 0;\r
+ const UTF32 byteMask = 0xBF;\r
+ const UTF32 byteMark = 0x80; \r
+ const UTF16* oldSource = source; /* In case we have to back up because of target overflow. */\r
+ ch = *source++;\r
+ /* If we have a surrogate pair, convert to UTF32 first. */\r
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {\r
+ /* If the 16 bits following the high surrogate are in the source buffer... */\r
+ if (source < sourceEnd) {\r
+ UTF32 ch2 = *source;\r
+ /* If it's a low surrogate, convert to UTF32. */\r
+ if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {\r
+ ch = ((ch - UNI_SUR_HIGH_START) << halfShift)\r
+ + (ch2 - UNI_SUR_LOW_START) + halfBase;\r
+ ++source;\r
+ } else if (flags == strictConversion) { /* it's an unpaired high surrogate */\r
+ --source; /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ }\r
+ } else { /* We don't have the 16 bits following the high surrogate. */\r
+ --source; /* return to the high surrogate */\r
+ result = sourceExhausted;\r
+ break;\r
+ }\r
+ } else if (flags == strictConversion) {\r
+ /* UTF-16 surrogate values are illegal in UTF-32 */\r
+ if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {\r
+ --source; /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ }\r
+ }\r
+ /* Figure out how many bytes the result will require */\r
+ if (ch < (UTF32)0x80) { bytesToWrite = 1;\r
+ } else if (ch < (UTF32)0x800) { bytesToWrite = 2;\r
+ } else if (ch < (UTF32)0x10000) { bytesToWrite = 3;\r
+ } else if (ch < (UTF32)0x110000) { bytesToWrite = 4;\r
+ } else { bytesToWrite = 3;\r
+ ch = UNI_REPLACEMENT_CHAR;\r
+ }\r
+\r
+ target += bytesToWrite;\r
+ if (target > targetEnd) {\r
+ source = oldSource; /* Back up source pointer! */\r
+ target -= bytesToWrite; result = targetExhausted; break;\r
+ }\r
+ switch (bytesToWrite) { /* note: everything falls through. */\r
+ case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;\r
+ case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;\r
+ case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;\r
+ case 1: *--target = (UTF8)(ch | firstByteMark[bytesToWrite]);\r
+ }\r
+ target += bytesToWrite;\r
+ }\r
+ *sourceStart = source;\r
+ *targetStart = target;\r
+ return result;\r
+}\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+/*\r
+ * Utility routine to tell whether a sequence of bytes is legal UTF-8.\r
+ * This must be called with the length pre-determined by the first byte.\r
+ * If not calling this from ConvertUTF8to*, then the length can be set by:\r
+ * length = trailingBytesForUTF8[*source]+1;\r
+ * and the sequence is illegal right away if there aren't that many bytes\r
+ * available.\r
+ * If presented with a length > 4, this returns false. The Unicode\r
+ * definition of UTF-8 goes up to 4-byte sequences.\r
+ */\r
+\r
+static ANTLR3_BOOLEAN\r
+isLegalUTF8(const UTF8 *source, int length) {\r
+ UTF8 a;\r
+ const UTF8 *srcptr = source+length;\r
+ switch (length) {\r
+ default: return false;\r
+ /* Everything else falls through when "true"... */\r
+ case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;\r
+ case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;\r
+ case 2: if ((a = (*--srcptr)) > 0xBF) return false;\r
+\r
+ switch (*source) {\r
+ /* no fall-through in this inner switch */\r
+ case 0xE0: if (a < 0xA0) return false; break;\r
+ case 0xED: if (a > 0x9F) return false; break;\r
+ case 0xF0: if (a < 0x90) return false; break;\r
+ case 0xF4: if (a > 0x8F) return false; break;\r
+ default: if (a < 0x80) return false;\r
+ }\r
+\r
+ case 1: if (*source >= 0x80 && *source < 0xC2) return false;\r
+ }\r
+ if (*source > 0xF4) return false;\r
+ return true;\r
+}\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+/*\r
+ * Exported function to return whether a UTF-8 sequence is legal or not.\r
+ * This is not used here; it's just exported.\r
+ */\r
+ANTLR3_BOOLEAN\r
+isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd) {\r
+ int length = trailingBytesForUTF8[*source]+1;\r
+ if (source+length > sourceEnd) {\r
+ return false;\r
+ }\r
+ return isLegalUTF8(source, length);\r
+}\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+ConversionResult ConvertUTF8toUTF16 (\r
+ const UTF8** sourceStart, const UTF8* sourceEnd, \r
+ UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {\r
+ ConversionResult result = conversionOK;\r
+ const UTF8* source = *sourceStart;\r
+ UTF16* target = *targetStart;\r
+ while (source < sourceEnd) {\r
+ UTF32 ch = 0;\r
+ unsigned short extraBytesToRead = trailingBytesForUTF8[*source];\r
+ if (source + extraBytesToRead >= sourceEnd) {\r
+ result = sourceExhausted; break;\r
+ }\r
+ /* Do this check whether lenient or strict */\r
+ if (! isLegalUTF8(source, extraBytesToRead+1)) {\r
+ result = sourceIllegal;\r
+ break;\r
+ }\r
+ /*\r
+ * The cases all fall through. See "Note A" below.\r
+ */\r
+ switch (extraBytesToRead) {\r
+ case 5: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */\r
+ case 4: ch += *source++; ch <<= 6; /* remember, illegal UTF-8 */\r
+ case 3: ch += *source++; ch <<= 6;\r
+ case 2: ch += *source++; ch <<= 6;\r
+ case 1: ch += *source++; ch <<= 6;\r
+ case 0: ch += *source++;\r
+ }\r
+ ch -= offsetsFromUTF8[extraBytesToRead];\r
+\r
+ if (target >= targetEnd) {\r
+ source -= (extraBytesToRead+1); /* Back up source pointer! */\r
+ result = targetExhausted; break;\r
+ }\r
+ if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */\r
+ /* UTF-16 surrogate values are illegal in UTF-32 */\r
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {\r
+ if (flags == strictConversion) {\r
+ source -= (extraBytesToRead+1); /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ } else {\r
+ *target++ = UNI_REPLACEMENT_CHAR;\r
+ }\r
+ } else {\r
+ *target++ = (UTF16)ch; /* normal case */\r
+ }\r
+ } else if (ch > UNI_MAX_UTF16) {\r
+ if (flags == strictConversion) {\r
+ result = sourceIllegal;\r
+ source -= (extraBytesToRead+1); /* return to the start */\r
+ break; /* Bail out; shouldn't continue */\r
+ } else {\r
+ *target++ = UNI_REPLACEMENT_CHAR;\r
+ }\r
+ } else {\r
+ /* target is a character in range 0xFFFF - 0x10FFFF. */\r
+ if (target + 1 >= targetEnd) {\r
+ source -= (extraBytesToRead+1); /* Back up source pointer! */\r
+ result = targetExhausted; break;\r
+ }\r
+ ch -= halfBase;\r
+ *target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);\r
+ *target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);\r
+ }\r
+ }\r
+ *sourceStart = source;\r
+ *targetStart = target;\r
+ return result;\r
+}\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+ConversionResult ConvertUTF32toUTF8 (\r
+ const UTF32** sourceStart, const UTF32* sourceEnd, \r
+ UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {\r
+ ConversionResult result = conversionOK;\r
+ const UTF32* source = *sourceStart;\r
+ UTF8* target = *targetStart;\r
+ while (source < sourceEnd) {\r
+ UTF32 ch;\r
+ unsigned short bytesToWrite = 0;\r
+ const UTF32 byteMask = 0xBF;\r
+ const UTF32 byteMark = 0x80; \r
+ ch = *source++;\r
+ if (flags == strictConversion ) {\r
+ /* UTF-16 surrogate values are illegal in UTF-32 */\r
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {\r
+ --source; /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ }\r
+ }\r
+ /*\r
+ * Figure out how many bytes the result will require. Turn any\r
+ * illegally large UTF32 things (> Plane 17) into replacement chars.\r
+ */\r
+ if (ch < (UTF32)0x80) { bytesToWrite = 1;\r
+ } else if (ch < (UTF32)0x800) { bytesToWrite = 2;\r
+ } else if (ch < (UTF32)0x10000) { bytesToWrite = 3;\r
+ } else if (ch <= UNI_MAX_LEGAL_UTF32) { bytesToWrite = 4;\r
+ } else { bytesToWrite = 3;\r
+ ch = UNI_REPLACEMENT_CHAR;\r
+ result = sourceIllegal;\r
+ }\r
+ \r
+ target += bytesToWrite;\r
+ if (target > targetEnd) {\r
+ --source; /* Back up source pointer! */\r
+ target -= bytesToWrite; result = targetExhausted; break;\r
+ }\r
+ switch (bytesToWrite) { /* note: everything falls through. */\r
+ case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;\r
+ case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;\r
+ case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;\r
+ case 1: *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);\r
+ }\r
+ target += bytesToWrite;\r
+ }\r
+ *sourceStart = source;\r
+ *targetStart = target;\r
+ return result;\r
+}\r
+\r
+/* --------------------------------------------------------------------- */\r
+\r
+ConversionResult ConvertUTF8toUTF32 (\r
+ const UTF8** sourceStart, const UTF8* sourceEnd, \r
+ UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {\r
+ ConversionResult result = conversionOK;\r
+ const UTF8* source = *sourceStart;\r
+ UTF32* target = *targetStart;\r
+ while (source < sourceEnd) {\r
+ UTF32 ch = 0;\r
+ unsigned short extraBytesToRead = trailingBytesForUTF8[*source];\r
+ if (source + extraBytesToRead >= sourceEnd) {\r
+ result = sourceExhausted; break;\r
+ }\r
+ /* Do this check whether lenient or strict */\r
+ if (! isLegalUTF8(source, extraBytesToRead+1)) {\r
+ result = sourceIllegal;\r
+ break;\r
+ }\r
+ /*\r
+ * The cases all fall through. See "Note A" below.\r
+ */\r
+ switch (extraBytesToRead) {\r
+ case 5: ch += *source++; ch <<= 6;\r
+ case 4: ch += *source++; ch <<= 6;\r
+ case 3: ch += *source++; ch <<= 6;\r
+ case 2: ch += *source++; ch <<= 6;\r
+ case 1: ch += *source++; ch <<= 6;\r
+ case 0: ch += *source++;\r
+ }\r
+ ch -= offsetsFromUTF8[extraBytesToRead];\r
+\r
+ if (target >= targetEnd) {\r
+ source -= (extraBytesToRead+1); /* Back up the source pointer! */\r
+ result = targetExhausted; break;\r
+ }\r
+ if (ch <= UNI_MAX_LEGAL_UTF32) {\r
+ /*\r
+ * UTF-16 surrogate values are illegal in UTF-32, and anything\r
+ * over Plane 17 (> 0x10FFFF) is illegal.\r
+ */\r
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {\r
+ if (flags == strictConversion) {\r
+ source -= (extraBytesToRead+1); /* return to the illegal value itself */\r
+ result = sourceIllegal;\r
+ break;\r
+ } else {\r
+ *target++ = UNI_REPLACEMENT_CHAR;\r
+ }\r
+ } else {\r
+ *target++ = ch;\r
+ }\r
+ } else { /* i.e., ch > UNI_MAX_LEGAL_UTF32 */\r
+ result = sourceIllegal;\r
+ *target++ = UNI_REPLACEMENT_CHAR;\r
+ }\r
+ }\r
+ *sourceStart = source;\r
+ *targetStart = target;\r
+ return result;\r
+}\r
+\r
+/* ---------------------------------------------------------------------\r
+\r
+ Note A.\r
+ The fall-through switches in UTF-8 reading code save a\r
+ temp variable, some decrements & conditionals. The switches\r
+ are equivalent to the following loop:\r
+ {\r
+ int tmpBytesToRead = extraBytesToRead+1;\r
+ do {\r
+ ch += *source++;\r
+ --tmpBytesToRead;\r
+ if (tmpBytesToRead) ch <<= 6;\r
+ } while (tmpBytesToRead > 0);\r
+ }\r
+ In UTF-8 writing code, the switches on "bytesToWrite" are\r
+ similarly unrolled loops.\r
+\r
+ --------------------------------------------------------------------- */\r
Code Review / simantics / platform.git / blobdiff