diff options
Diffstat (limited to 'plugins/mir_core/utf.cpp')
| -rw-r--r-- | plugins/mir_core/utf.cpp | 406 |
1 files changed, 406 insertions, 0 deletions
diff --git a/plugins/mir_core/utf.cpp b/plugins/mir_core/utf.cpp new file mode 100644 index 0000000000..5ec6042758 --- /dev/null +++ b/plugins/mir_core/utf.cpp @@ -0,0 +1,406 @@ +/*
+
+Miranda IM: the free IM client for Microsoft* Windows*
+
+Copyright 2000-2009 Miranda ICQ/IM project,
+all portions of this codebase are copyrighted to the people
+listed in contributors.txt.
+
+ Copyright 2000 Alexandre Julliard of Wine project
+ (UTF-8 conversion routines)
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+#include "commonheaders.h"
+
+/* number of following bytes in sequence based on first byte value (for bytes above 0x7f) */
+static const char utf8_length[128] =
+{
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80-0x8f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90-0x9f */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0-0xaf */
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0-0xbf */
+ 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xc0-0xcf */
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xd0-0xdf */
+ 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xe0-0xef */
+ 3, 3, 3, 3, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 /* 0xf0-0xff */
+};
+
+/* first byte mask depending on UTF-8 sequence length */
+static const unsigned char utf8_mask[4] = { 0x7f, 0x1f, 0x0f, 0x07 };
+
+/* minimum Unicode value depending on UTF-8 sequence length */
+static const unsigned int utf8_minval[4] = { 0x0, 0x80, 0x800, 0x10000 };
+
+/* get the next char value taking surrogates into account */
+static unsigned int getSurrogateValue(const wchar_t *src, unsigned int srclen)
+{
+ if (src[0] >= 0xd800 && src[0] <= 0xdfff) { /* surrogate pair */
+ if (src[0] > 0xdbff || /* invalid high surrogate */
+ srclen <= 1 || /* missing low surrogate */
+ src[1] < 0xdc00 || src[1] > 0xdfff) /* invalid low surrogate */
+ return 0;
+ return 0x10000 + ((src[0] & 0x3ff) << 10) + (src[1] & 0x3ff);
+ }
+ return src[0];
+}
+
+/* query necessary dst length for src string */
+static int Ucs2toUtf8Len(const wchar_t *src, unsigned int srclen)
+{
+ int len;
+ unsigned int val;
+
+ for (len = 0; srclen; srclen--, src++) {
+ if (*src < 0x80) { /* 0x00-0x7f: 1 byte */
+ len++;
+ continue;
+ }
+ if (*src < 0x800) { /* 0x80-0x7ff: 2 bytes */
+ len += 2;
+ continue;
+ }
+ if ( !(val = getSurrogateValue(src, srclen)))
+ return -2;
+
+ if (val < 0x10000) /* 0x800-0xffff: 3 bytes */
+ len += 3;
+ else { /* 0x10000-0x10ffff: 4 bytes */
+ len += 4;
+ src++;
+ srclen--;
+ }
+ }
+ return len;
+}
+
+MIR_CORE_DLL(int) Ucs2toUtf8Len(const wchar_t *src)
+{
+ if (src == 0)
+ return 0;
+
+ return Ucs2toUtf8Len(src, (int)wcslen(src));
+}
+
+/* wide char to UTF-8 string conversion */
+/* return -1 on dst buffer overflow, -2 on invalid input char */
+int Ucs2toUtf8(const wchar_t *src, int srclen, char *dst, int dstlen)
+{
+ int len;
+
+ for (len = dstlen; srclen; srclen--, src++)
+ {
+ WCHAR ch = *src;
+ unsigned int val;
+
+ if (ch < 0x80) /* 0x00-0x7f: 1 byte */
+ {
+ if ( !len--) return -1; /* overflow */
+ *dst++ = ch;
+ continue;
+ }
+
+ if (ch < 0x800) /* 0x80-0x7ff: 2 bytes */
+ {
+ if ((len -= 2) < 0) return -1; /* overflow */
+ dst[1] = 0x80 | (ch & 0x3f);
+ ch >>= 6;
+ dst[0] = 0xc0 | ch;
+ dst += 2;
+ continue;
+ }
+
+ if ( !(val = getSurrogateValue(src, srclen)))
+ {
+ return -2;
+ }
+
+ if (val < 0x10000) /* 0x800-0xffff: 3 bytes */
+ {
+ if ((len -= 3) < 0) return -1; /* overflow */
+ dst[2] = 0x80 | (val & 0x3f);
+ val >>= 6;
+ dst[1] = 0x80 | (val & 0x3f);
+ val >>= 6;
+ dst[0] = 0xe0 | val;
+ dst += 3;
+ }
+ else /* 0x10000-0x10ffff: 4 bytes */
+ {
+ if ((len -= 4) < 0) return -1; /* overflow */
+ dst[3] = 0x80 | (val & 0x3f);
+ val >>= 6;
+ dst[2] = 0x80 | (val & 0x3f);
+ val >>= 6;
+ dst[1] = 0x80 | (val & 0x3f);
+ val >>= 6;
+ dst[0] = 0xf0 | val;
+ dst += 4;
+ src++;
+ srclen--;
+ }
+ }
+ return dstlen - len;
+}
+
+/* helper for the various utf8 mbstowcs functions */
+static unsigned int decodeUtf8Char(unsigned char ch, const char **str, const char *strend)
+{
+ unsigned int len = utf8_length[ch-0x80];
+ unsigned int res = ch & utf8_mask[len];
+ const char *end = *str + len;
+
+ if (end > strend) return ~0;
+ switch(len)
+ {
+ case 3:
+ if ((ch = end[-3] ^ 0x80) >= 0x40) break;
+ res = (res << 6) | ch;
+ (*str)++;
+ case 2:
+ if ((ch = end[-2] ^ 0x80) >= 0x40) break;
+ res = (res << 6) | ch;
+ (*str)++;
+ case 1:
+ if ((ch = end[-1] ^ 0x80) >= 0x40) break;
+ res = (res << 6) | ch;
+ (*str)++;
+ if (res < utf8_minval[len]) break;
+ return res;
+ }
+ return ~0;
+}
+
+/* query necessary dst length for src string */
+static inline int Utf8toUcs2Len(const char *src, int srclen)
+{
+ int ret = 0;
+ unsigned int res;
+ const char *srcend = src + srclen;
+
+ while (src < srcend)
+ {
+ unsigned char ch = *src++;
+ if (ch < 0x80) /* special fast case for 7-bit ASCII */
+ {
+ ret++;
+ continue;
+ }
+ if ((res = decodeUtf8Char(ch, &src, srcend)) <= 0x10ffff)
+ {
+ if (res > 0xffff) ret++;
+ ret++;
+ }
+ else return -2; /* bad char */
+ /* otherwise ignore it */
+ }
+ return ret;
+}
+
+/* UTF-8 to wide char string conversion */
+/* return -1 on dst buffer overflow, -2 on invalid input char */
+int Utf8toUcs2(const char *src, int srclen, wchar_t *dst, int dstlen)
+{
+ unsigned int res;
+ const char *srcend = src + srclen;
+ wchar_t *dstend = dst + dstlen;
+
+ while ((dst < dstend) && (src < srcend))
+ {
+ unsigned char ch = *src++;
+ if (ch < 0x80) /* special fast case for 7-bit ASCII */
+ {
+ *dst++ = ch;
+ continue;
+ }
+ if ((res = decodeUtf8Char(ch, &src, srcend)) <= 0xffff)
+ {
+ *dst++ = res;
+ }
+ else if (res <= 0x10ffff) /* we need surrogates */
+ {
+ if (dst == dstend - 1) return -1; /* overflow */
+ res -= 0x10000;
+ *dst++ = 0xd800 | (res >> 10);
+ *dst++ = 0xdc00 | (res & 0x3ff);
+ }
+ else return -2; /* bad char */
+ /* otherwise ignore it */
+ }
+ if (src < srcend) return -1; /* overflow */
+ return dstlen - (dstend - dst);
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+// Utf8Decode - converts UTF8-encoded string to the UCS2/MBCS format
+
+MIR_CORE_DLL(char*) Utf8DecodeCP(char* str, int codepage, wchar_t** ucs2)
+{
+ int len;
+ bool needs_free = false;
+ wchar_t* tempBuf = NULL;
+ if (ucs2)
+ *ucs2 = NULL;
+
+ if (str == NULL)
+ return NULL;
+
+ len = (int)strlen(str);
+
+ if (len < 2) {
+ if (ucs2 != NULL) {
+ *ucs2 = tempBuf = (wchar_t*)mir_alloc((len + 1) * sizeof(wchar_t));
+ MultiByteToWideChar(codepage, 0, str, len, tempBuf, len);
+ tempBuf[len] = 0;
+ }
+ return str;
+ }
+
+ int destlen = Utf8toUcs2Len(str, len);
+ if (destlen < 0)
+ return NULL;
+
+ if (ucs2 == NULL) {
+ __try
+ {
+ tempBuf = (wchar_t*)alloca((destlen + 1) * sizeof(wchar_t));
+ }
+ __except(EXCEPTION_EXECUTE_HANDLER)
+ {
+ tempBuf = NULL;
+ needs_free = true;
+ }
+ }
+
+ if (tempBuf == NULL) {
+ tempBuf = (wchar_t*)mir_alloc((destlen + 1) * sizeof(wchar_t));
+ if (tempBuf == NULL)
+ return NULL;
+ }
+
+ Utf8toUcs2(str, len, tempBuf, destlen);
+ tempBuf[destlen] = 0;
+ WideCharToMultiByte(codepage, 0, tempBuf, -1, str, len + 1, "?", NULL);
+
+ if (ucs2)
+ *ucs2 = tempBuf;
+ else if (needs_free)
+ mir_free(tempBuf);
+
+ return str;
+}
+
+MIR_CORE_DLL(char*) Utf8Decode(char* str, wchar_t** ucs2)
+{
+ return Utf8DecodeCP(str, LangPackGetDefaultCodePage(), ucs2);
+}
+
+MIR_CORE_DLL(wchar_t*) Utf8DecodeW(const char* str)
+{
+ if (str == NULL)
+ return NULL;
+
+ int len = (int)strlen(str);
+
+ int destlen = Utf8toUcs2Len(str, len);
+ if (destlen < 0) return NULL;
+
+ wchar_t* ucs2 = (wchar_t*)mir_alloc((destlen + 1) * sizeof(wchar_t));
+ if (ucs2 == NULL) return NULL;
+
+ if (Utf8toUcs2(str, len, ucs2, destlen) >= 0)
+ {
+ ucs2[destlen] = 0;
+ return ucs2;
+ }
+
+ mir_free(ucs2);
+
+ return NULL;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+// Utf8Encode - converts MBCS string to the UTF8-encoded format
+
+MIR_CORE_DLL(char*) Utf8EncodeCP(const char* src, int codepage)
+{
+ int len;
+ bool needs_free = false;
+ char* result = NULL;
+ wchar_t* tempBuf;
+
+ if (src == NULL)
+ return NULL;
+
+ len = (int)strlen(src);
+
+ __try
+ {
+ tempBuf = (wchar_t*)alloca((len + 1) * sizeof(wchar_t));
+ }
+ __except(EXCEPTION_EXECUTE_HANDLER)
+ {
+ tempBuf = (wchar_t*)mir_alloc((len + 1) * sizeof(wchar_t));
+ if (tempBuf == NULL) return NULL;
+ needs_free = true;
+ }
+
+ len = MultiByteToWideChar(codepage, 0, src, -1, tempBuf, len + 1);
+
+ int destlen = Ucs2toUtf8Len(tempBuf, len);
+ if (destlen >= 0)
+ {
+ result = (char*)mir_alloc(destlen + 1);
+ if (result)
+ {
+ Ucs2toUtf8(tempBuf, len, result, destlen);
+ result[destlen] = 0;
+ }
+ }
+
+ if (needs_free)
+ mir_free(tempBuf);
+
+ return result;
+}
+
+MIR_CORE_DLL(char*) Utf8Encode(const char* src)
+{
+ return Utf8EncodeCP(src, LangPackGetDefaultCodePage());
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////
+// Utf8Encode - converts UCS2 string to the UTF8-encoded format
+
+MIR_CORE_DLL(char*) Utf8EncodeW(const wchar_t* src)
+{
+ if (src == NULL)
+ return NULL;
+
+ int len = (int)wcslen(src);
+
+ int destlen = Ucs2toUtf8Len(src, len);
+ if (destlen < 0) return NULL;
+
+ char* result = (char*)mir_alloc(destlen + 1);
+ if (result == NULL)
+ return NULL;
+
+ Ucs2toUtf8(src, len, result, destlen);
+ result[destlen] = 0;
+
+ return result;
+}
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