Add toolchain and mbtk source
Change-Id: Ie12546301367ea59240bf23d5e184ad7e36e40b3
diff --git a/mbtk/mbtk_lib/src/mbtk_utf.c b/mbtk/mbtk_lib/src/mbtk_utf.c
new file mode 100755
index 0000000..295ff1d
--- /dev/null
+++ b/mbtk/mbtk_lib/src/mbtk_utf.c
@@ -0,0 +1,703 @@
+//
+// Created by hitmoon on 15-12-17.
+//
+#include "mbtk_utf.h"
+#include <stdio.h>
+#include <wchar.h>
+#include <string.h>
+
+static const int halfShift = 10;
+/* used for shifting by 10 bits */
+
+static const UTF32 halfBase = 0x0010000UL;
+static const UTF32 halfMask = 0x3FFUL;
+
+#define UNI_SUR_HIGH_START (UTF32)0xD800
+#define UNI_SUR_HIGH_END (UTF32)0xDBFF
+#define UNI_SUR_LOW_START (UTF32)0xDC00
+#define UNI_SUR_LOW_END (UTF32)0xDFFF
+#define false 0
+#define true 1
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF32toUTF16(
+ const UTF32 **sourceStart, const UTF32 *sourceEnd,
+ UTF16 **targetStart, UTF16 *targetEnd, ConversionFlags flags) {
+ ConversionResult result = conversionOK;
+ const UTF32 *source = *sourceStart;
+ UTF16 *target = *targetStart;
+ while (source < sourceEnd) {
+ UTF32 ch;
+ if (target >= targetEnd) {
+ result = targetExhausted;
+ break;
+ }
+ ch = *source++;
+ if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
+ /* UTF-16 surrogate values are illegal in UTF-32; 0xffff or 0xfffe are both reserved values */
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+ if (flags == strictConversion) {
+ --source; /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ } else {
+ *target++ = UNI_REPLACEMENT_CHAR;
+ }
+ } else {
+ *target++ = (UTF16) ch; /* normal case */
+ }
+ } else if (ch > UNI_MAX_LEGAL_UTF32) {
+ if (flags == strictConversion) {
+ result = sourceIllegal;
+ } else {
+ *target++ = UNI_REPLACEMENT_CHAR;
+ }
+ } else {
+ /* target is a character in range 0xFFFF - 0x10FFFF. */
+ if (target + 1 >= targetEnd) {
+ --source; /* Back up source pointer! */
+ result = targetExhausted;
+ break;
+ }
+ ch -= halfBase;
+ *target++ = (UTF16) ((ch >> halfShift) + UNI_SUR_HIGH_START);
+ *target++ = (UTF16) ((ch & halfMask) + UNI_SUR_LOW_START);
+ }
+ }
+ *sourceStart = source;
+ *targetStart = target;
+ return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF16toUTF32(
+ const UTF16 **sourceStart, const UTF16 *sourceEnd,
+ UTF32 **targetStart, UTF32 *targetEnd, ConversionFlags flags) {
+ ConversionResult result = conversionOK;
+ const UTF16 *source = *sourceStart;
+ UTF32 *target = *targetStart;
+ UTF32 ch, ch2;
+ while (source < sourceEnd) {
+ const UTF16 *oldSource = source; /* In case we have to back up because of target overflow. */
+ ch = *source++;
+ /* If we have a surrogate pair, convert to UTF32 first. */
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
+ /* If the 16 bits following the high surrogate are in the source buffer... */
+ if (source < sourceEnd) {
+ ch2 = *source;
+ /* If it's a low surrogate, convert to UTF32. */
+ if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
+ ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
+ + (ch2 - UNI_SUR_LOW_START) + halfBase;
+ ++source;
+ } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
+ --source; /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ }
+ } else { /* We don't have the 16 bits following the high surrogate. */
+ --source; /* return to the high surrogate */
+ result = sourceExhausted;
+ break;
+ }
+ } else if (flags == strictConversion) {
+ /* UTF-16 surrogate values are illegal in UTF-32 */
+ if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
+ --source; /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ }
+ }
+ if (target >= targetEnd) {
+ source = oldSource; /* Back up source pointer! */
+ result = targetExhausted;
+ break;
+ }
+ *target++ = ch;
+ }
+ *sourceStart = source;
+ *targetStart = target;
+#ifdef CVTUTF_DEBUG
+ if (result == sourceIllegal) {
+ fprintf(stderr, "ConvertUTF16toUTF32 illegal seq 0x%04x,%04x/n", ch, ch2);
+ fflush(stderr);
+}
+#endif
+ return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Index into the table below with the first byte of a UTF-8 sequence to
+ * get the number of trailing bytes that are supposed to follow it.
+ * Note that *legal* UTF-8 values can't have 4 or 5-bytes. The table is
+ * left as-is for anyone who may want to do such conversion, which was
+ * allowed in earlier algorithms.
+ */
+static const char trailingBytesForUTF8[256] = {
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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
+};
+
+/*
+ * Magic values subtracted from a buffer value during UTF8 conversion.
+ * This table contains as many values as there might be trailing bytes
+ * in a UTF-8 sequence.
+ */
+static const UTF32 offsetsFromUTF8[6] = {0x00000000UL, 0x00003080UL, 0x000E2080UL,
+ 0x03C82080UL, 0xFA082080UL, 0x82082080UL};
+
+/*
+ * Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
+ * into the first byte, depending on how many bytes follow. There are
+ * as many entries in this table as there are UTF-8 sequence types.
+ * (I.e., one byte sequence, two byte... etc.). Remember that sequencs
+ * for *legal* UTF-8 will be 4 or fewer bytes total.
+ */
+static const UTF8 firstByteMark[7] = {0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC};
+
+/* --------------------------------------------------------------------- */
+
+/* The interface converts a whole buffer to avoid function-call overhead.
+ * Constants have been gathered. Loops & conditionals have been removed as
+ * much as possible for efficiency, in favor of drop-through switches.
+ * (See "Note A" at the bottom of the file for equivalent code.)
+ * If your compiler supports it, the "isLegalUTF8" call can be turned
+ * into an inline function.
+ */
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF16toUTF8(
+ const UTF16 **sourceStart, const UTF16 *sourceEnd,
+ UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags) {
+ ConversionResult result = conversionOK;
+ const UTF16 *source = *sourceStart;
+ UTF8 *target = *targetStart;
+ while (source < sourceEnd) {
+ UTF32 ch;
+ unsigned short bytesToWrite = 0;
+ const UTF32 byteMask = 0xBF;
+ const UTF32 byteMark = 0x80;
+ const UTF16 *oldSource = source; /* In case we have to back up because of target overflow. */
+ ch = *source++;
+ /* If we have a surrogate pair, convert to UTF32 first. */
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
+ /* If the 16 bits following the high surrogate are in the source buffer... */
+ if (source < sourceEnd) {
+ UTF32 ch2 = *source;
+ /* If it's a low surrogate, convert to UTF32. */
+ if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
+ ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
+ + (ch2 - UNI_SUR_LOW_START) + halfBase;
+ ++source;
+ } else if (flags == strictConversion) { /* it's an unpaired high surrogate */
+ --source; /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ }
+ } else { /* We don't have the 16 bits following the high surrogate. */
+ --source; /* return to the high surrogate */
+ result = sourceExhausted;
+ break;
+ }
+ } else if (flags == strictConversion) {
+ /* UTF-16 surrogate values are illegal in UTF-32 */
+ if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
+ --source; /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ }
+ }
+ /* Figure out how many bytes the result will require */
+ if (ch < (UTF32) 0x80) {
+ bytesToWrite = 1;
+ } else if (ch < (UTF32) 0x800) {
+ bytesToWrite = 2;
+ } else if (ch < (UTF32) 0x10000) {
+ bytesToWrite = 3;
+ } else if (ch < (UTF32) 0x110000) {
+ bytesToWrite = 4;
+ } else {
+ bytesToWrite = 3;
+ ch = UNI_REPLACEMENT_CHAR;
+ }
+
+ target += bytesToWrite;
+ if (target > targetEnd) {
+ source = oldSource; /* Back up source pointer! */
+ target -= bytesToWrite;
+ result = targetExhausted;
+ break;
+ }
+ switch (bytesToWrite) { /* note: everything falls through. */
+ case 4:
+ *--target = (UTF8) ((ch | byteMark) & byteMask);
+ ch >>= 6;
+ case 3:
+ *--target = (UTF8) ((ch | byteMark) & byteMask);
+ ch >>= 6;
+ case 2:
+ *--target = (UTF8) ((ch | byteMark) & byteMask);
+ ch >>= 6;
+ case 1:
+ *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);
+ }
+ target += bytesToWrite;
+ }
+ *sourceStart = source;
+ *targetStart = target;
+ return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Utility routine to tell whether a sequence of bytes is legal UTF-8.
+ * This must be called with the length pre-determined by the first byte.
+ * If not calling this from ConvertUTF8to*, then the length can be set by:
+ * length = trailingBytesForUTF8[*source]+1;
+ * and the sequence is illegal right away if there aren't that many bytes
+ * available.
+ * If presented with a length > 4, this returns false. The Unicode
+ * definition of UTF-8 goes up to 4-byte sequences.
+ */
+
+static Boolean isLegalUTF8(const UTF8 *source, int length) {
+ UTF8 a;
+ const UTF8 *srcptr = source + length;
+ switch (length) {
+ default:
+ return false;
+ /* Everything else falls through when "true"... */
+ case 4:
+ if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
+ case 3:
+ if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
+ case 2:
+ if ((a = (*--srcptr)) > 0xBF) return false;
+
+ switch (*source) {
+ /* no fall-through in this inner switch */
+ case 0xE0:
+ if (a < 0xA0) return false;
+ break;
+ case 0xED:
+ if (a > 0x9F) return false;
+ break;
+ case 0xF0:
+ if (a < 0x90) return false;
+ break;
+ case 0xF4:
+ if (a > 0x8F) return false;
+ break;
+ default:
+ if (a < 0x80) return false;
+ }
+
+ case 1:
+ if (*source >= 0x80 && *source < 0xC2) return false;
+ }
+ if (*source > 0xF4) return false;
+ return true;
+}
+
+/* --------------------------------------------------------------------- */
+
+/*
+ * Exported function to return whether a UTF-8 sequence is legal or not.
+ * This is not used here; it's just exported.
+ */
+Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd) {
+ int length = trailingBytesForUTF8[*source] + 1;
+ if (source + length > sourceEnd) {
+ return false;
+ }
+ return isLegalUTF8(source, length);
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF8toUTF16(
+ const UTF8 **sourceStart, const UTF8 *sourceEnd,
+ UTF16 **targetStart, UTF16 *targetEnd, ConversionFlags flags) {
+ ConversionResult result = conversionOK;
+ const UTF8 *source = *sourceStart;
+ UTF16 *target = *targetStart;
+ while (source < sourceEnd) {
+ UTF32 ch = 0;
+ unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
+ if (source + extraBytesToRead >= sourceEnd) {
+ result = sourceExhausted;
+ break;
+ }
+ /* Do this check whether lenient or strict */
+ if (!isLegalUTF8(source, extraBytesToRead + 1)) {
+ result = sourceIllegal;
+ break;
+ }
+ /*
+ * The cases all fall through. See "Note A" below.
+ */
+ switch (extraBytesToRead) {
+ case 5:
+ ch += *source++;
+ ch <<= 6; /* remember, illegal UTF-8 */
+ case 4:
+ ch += *source++;
+ ch <<= 6; /* remember, illegal UTF-8 */
+ case 3:
+ ch += *source++;
+ ch <<= 6;
+ case 2:
+ ch += *source++;
+ ch <<= 6;
+ case 1:
+ ch += *source++;
+ ch <<= 6;
+ case 0:
+ ch += *source++;
+ }
+ ch -= offsetsFromUTF8[extraBytesToRead];
+
+ if (target >= targetEnd) {
+ source -= (extraBytesToRead + 1); /* Back up source pointer! */
+ result = targetExhausted;
+ break;
+ }
+ if (ch <= UNI_MAX_BMP) { /* Target is a character <= 0xFFFF */
+ /* UTF-16 surrogate values are illegal in UTF-32 */
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+ if (flags == strictConversion) {
+ source -= (extraBytesToRead + 1); /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ } else {
+ *target++ = UNI_REPLACEMENT_CHAR;
+ }
+ } else {
+ *target++ = (UTF16) ch; /* normal case */
+ }
+ } else if (ch > UNI_MAX_UTF16) {
+ if (flags == strictConversion) {
+ result = sourceIllegal;
+ source -= (extraBytesToRead + 1); /* return to the start */
+ break; /* Bail out; shouldn't continue */
+ } else {
+ *target++ = UNI_REPLACEMENT_CHAR;
+ }
+ } else {
+ /* target is a character in range 0xFFFF - 0x10FFFF. */
+ if (target + 1 >= targetEnd) {
+ source -= (extraBytesToRead + 1); /* Back up source pointer! */
+ result = targetExhausted;
+ break;
+ }
+ ch -= halfBase;
+ *target++ = (UTF16) ((ch >> halfShift) + UNI_SUR_HIGH_START);
+ *target++ = (UTF16) ((ch & halfMask) + UNI_SUR_LOW_START);
+ }
+ }
+ *sourceStart = source;
+ *targetStart = target;
+ return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF32toUTF8(
+ const UTF32 **sourceStart, const UTF32 *sourceEnd,
+ UTF8 **targetStart, UTF8 *targetEnd, ConversionFlags flags) {
+ ConversionResult result = conversionOK;
+ const UTF32 *source = *sourceStart;
+ UTF8 *target = *targetStart;
+ while (source < sourceEnd) {
+ UTF32 ch;
+ unsigned short bytesToWrite = 0;
+ const UTF32 byteMask = 0xBF;
+ const UTF32 byteMark = 0x80;
+ ch = *source++;
+ if (flags == strictConversion) {
+ /* UTF-16 surrogate values are illegal in UTF-32 */
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+ --source; /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ }
+ }
+ /*
+ * Figure out how many bytes the result will require. Turn any
+ * illegally large UTF32 things (> Plane 17) into replacement chars.
+ */
+ if (ch < (UTF32) 0x80) {
+ bytesToWrite = 1;
+ } else if (ch < (UTF32) 0x800) {
+ bytesToWrite = 2;
+ } else if (ch < (UTF32) 0x10000) {
+ bytesToWrite = 3;
+ } else if (ch <= UNI_MAX_LEGAL_UTF32) {
+ bytesToWrite = 4;
+ } else {
+ bytesToWrite = 3;
+ ch = UNI_REPLACEMENT_CHAR;
+ result = sourceIllegal;
+ }
+
+ target += bytesToWrite;
+ if (target > targetEnd) {
+ --source; /* Back up source pointer! */
+ target -= bytesToWrite;
+ result = targetExhausted;
+ break;
+ }
+ switch (bytesToWrite) { /* note: everything falls through. */
+ case 4:
+ *--target = (UTF8) ((ch | byteMark) & byteMask);
+ ch >>= 6;
+ case 3:
+ *--target = (UTF8) ((ch | byteMark) & byteMask);
+ ch >>= 6;
+ case 2:
+ *--target = (UTF8) ((ch | byteMark) & byteMask);
+ ch >>= 6;
+ case 1:
+ *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);
+ }
+ target += bytesToWrite;
+ }
+ *sourceStart = source;
+ *targetStart = target;
+ return result;
+}
+
+/* --------------------------------------------------------------------- */
+
+ConversionResult ConvertUTF8toUTF32(
+ const UTF8 **sourceStart, const UTF8 *sourceEnd,
+ UTF32 **targetStart, UTF32 *targetEnd, ConversionFlags flags) {
+ ConversionResult result = conversionOK;
+ const UTF8 *source = *sourceStart;
+ UTF32 *target = *targetStart;
+ while (source < sourceEnd) {
+ UTF32 ch = 0;
+ unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
+ if (source + extraBytesToRead >= sourceEnd) {
+ result = sourceExhausted;
+ break;
+ }
+ /* Do this check whether lenient or strict */
+ if (!isLegalUTF8(source, extraBytesToRead + 1)) {
+ result = sourceIllegal;
+ break;
+ }
+ /*
+ * The cases all fall through. See "Note A" below.
+ */
+ switch (extraBytesToRead) {
+ case 5:
+ ch += *source++;
+ ch <<= 6;
+ case 4:
+ ch += *source++;
+ ch <<= 6;
+ case 3:
+ ch += *source++;
+ ch <<= 6;
+ case 2:
+ ch += *source++;
+ ch <<= 6;
+ case 1:
+ ch += *source++;
+ ch <<= 6;
+ case 0:
+ ch += *source++;
+ }
+ ch -= offsetsFromUTF8[extraBytesToRead];
+
+ if (target >= targetEnd) {
+ source -= (extraBytesToRead + 1); /* Back up the source pointer! */
+ result = targetExhausted;
+ break;
+ }
+ if (ch <= UNI_MAX_LEGAL_UTF32) {
+ /*
+ * UTF-16 surrogate values are illegal in UTF-32, and anything
+ * over Plane 17 (> 0x10FFFF) is illegal.
+ */
+ if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
+ if (flags == strictConversion) {
+ source -= (extraBytesToRead + 1); /* return to the illegal value itself */
+ result = sourceIllegal;
+ break;
+ } else {
+ *target++ = UNI_REPLACEMENT_CHAR;
+ }
+ } else {
+ *target++ = ch;
+ }
+ } else { /* i.e., ch > UNI_MAX_LEGAL_UTF32 */
+ result = sourceIllegal;
+ *target++ = UNI_REPLACEMENT_CHAR;
+ }
+ }
+ *sourceStart = source;
+ *targetStart = target;
+ return result;
+}
+
+/* ---------------------------------------------------------------------
+
+ Note A.
+ The fall-through switches in UTF-8 reading code save a
+ temp variable, some decrements & conditionals. The switches
+ are equivalent to the following loop:
+ {
+ int tmpBytesToRead = extraBytesToRead+1;
+ do {
+ ch += *source++;
+ --tmpBytesToRead;
+ if (tmpBytesToRead) ch <<= 6;
+ } while (tmpBytesToRead > 0);
+ }
+ In UTF-8 writing code, the switches on "bytesToWrite" are
+ similarly unrolled loops.
+
+ --------------------------------------------------------------------- */
+
+const unsigned char *utf32toutf8(wchar_t *source, unsigned char *target, size_t size, int *len){
+
+ wchar_t *s_start;
+ unsigned char *t_start;
+
+ s_start = source;
+ t_start = target;
+
+ if (ConvertUTF32toUTF8((const UTF32**) &s_start, (UTF32*)s_start + wcslen(source), (UTF8**)&t_start, (UTF8*)t_start + size, strictConversion) == conversionOK) {
+ *len = t_start - target;
+ }
+ else {
+ *len = 0;
+ }
+ target[*len] = '\0';
+ return (const unsigned char*)target;
+}
+
+
+unsigned char *utf16toutf8(unsigned short *source, unsigned char *target, size_t size, int *len){
+
+ unsigned short *s_start;
+ unsigned char *t_start;
+
+ s_start = source;
+ t_start = target;
+
+ if (ConvertUTF16toUTF8((const UTF16**) &s_start, (UTF16*)s_start + strlen((const char*)source) / 2, (UTF8**)&t_start, (UTF8*)t_start + size, strictConversion) == conversionOK) {
+ *len = t_start - target;
+ }
+ else {
+ *len = 0;
+ }
+ target[*len] = '\0';
+ return target;
+}
+
+unsigned short *utf8toutf16(unsigned char *source, unsigned short *target, size_t size, int *len)
+{
+ unsigned char *s_start;
+ unsigned short *t_start;
+
+ s_start = source;
+ t_start = target;
+
+ if (ConvertUTF8toUTF16((const UTF8 **)&s_start, s_start + strlen((const char*)source), &t_start, t_start + size, strictConversion) == conversionOK) {
+ *len = t_start - target;
+ }
+ else {
+ *len = 0;
+ }
+
+ return target;
+}
+
+u_int32_t next_char(unsigned char **string) {
+
+ int len = strlen((const char*)*string);
+ unsigned char ch[4];
+ int i = 0;
+
+ if (len < 4){
+ for (i = 0; i < len; i++)
+ ch[i] = (*string)[i];
+ }
+ else {
+ ch[0] = (*string)[0];
+ ch[1] = (*string)[1];
+ ch[2] = (*string)[2];
+ ch[3] = (*string)[3];
+ }
+
+ if(ch[0] < 0x80) {
+ *string = (*string + 1);
+ return ch[0];
+ }
+ else if (ch[0] >= 0xc0 && ch[0] <= 0xdf) {
+ *string = (*string + 2);
+ return ch[1] << 8 | ch[0];
+ }
+ else if (ch[0] >= 0xe0 && ch[0] <= 0xef) {
+ *string = (*string + 3);
+ return ch[2] << 16 | ch[1] << 8 | ch[0];
+ }
+ else if (ch[0] >= 0xf0 && ch[0] <= 0xf7) {
+ *string = (*string + 4);
+ return ch[3] << 24 | ch[2] << 16 | ch[1] << 8 | ch[0];
+ }
+
+ return *(u_int32_t*)ch;
+}
+
+
+int utf8len(unsigned char *string)
+{
+ unsigned char *end;
+ int ret = 0;
+
+ end = string + strlen((const char*)string);
+ while(string < end) {
+ next_char(&string);
+ ret++;
+ }
+ return ret;
+}
+
+int is_acsii(unsigned char *string)
+{
+ while(*string) {
+ if (*string >= 0x80)
+ return 0;
+ string++;
+ }
+ return 1;
+}
+
+size_t utf8_get_size(unsigned char *source, size_t num)
+{
+ size_t ret = 0;
+
+ unsigned char *cur = source;
+ while (num-- && *cur) {
+ next_char(&cur);
+ }
+ ret = cur - source;
+
+ return ret;
+}