| /* |
| * UTF-8 support routines |
| * |
| * Copyright 2000 Alexandre Julliard |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
| */ |
| |
| #include <string.h> |
| |
| #include "wine/unicode.h" |
| |
| extern WCHAR wine_compose( const WCHAR *str ) DECLSPEC_HIDDEN; |
| |
| /* 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 inline unsigned int get_surrogate_value( const WCHAR *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 inline int get_length_wcs_utf8( int flags, const WCHAR *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 = get_surrogate_value( src, srclen ))) |
| { |
| if (flags & WC_ERR_INVALID_CHARS) return -2; |
| continue; |
| } |
| if (val < 0x10000) /* 0x800-0xffff: 3 bytes */ |
| len += 3; |
| else /* 0x10000-0x10ffff: 4 bytes */ |
| { |
| len += 4; |
| src++; |
| srclen--; |
| } |
| } |
| return len; |
| } |
| |
| /* wide char to UTF-8 string conversion */ |
| /* return -1 on dst buffer overflow, -2 on invalid input char */ |
| int wine_utf8_wcstombs( int flags, const WCHAR *src, int srclen, char *dst, int dstlen ) |
| { |
| int len; |
| |
| if (!dstlen) return get_length_wcs_utf8( flags, src, srclen ); |
| |
| 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 = get_surrogate_value( src, srclen ))) |
| { |
| if (flags & WC_ERR_INVALID_CHARS) return -2; |
| continue; |
| } |
| |
| 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 inline unsigned int decode_utf8_char( 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 with composition */ |
| static inline int get_length_mbs_utf8_compose( int flags, const char *src, int srclen ) |
| { |
| int ret = 0; |
| unsigned int res; |
| WCHAR composed[2]; |
| const char *srcend = src + srclen; |
| |
| composed[0] = 0; |
| while (src < srcend) |
| { |
| unsigned char ch = *src++; |
| if (ch < 0x80) /* special fast case for 7-bit ASCII */ |
| { |
| composed[0] = ch; |
| ret++; |
| continue; |
| } |
| if ((res = decode_utf8_char( ch, &src, srcend )) <= 0xffff) |
| { |
| if (composed[0]) |
| { |
| composed[1] = res; |
| if ((composed[0] = wine_compose( composed ))) continue; |
| } |
| composed[0] = res; |
| ret++; |
| } |
| else if (res <= 0x10ffff) |
| { |
| ret += 2; |
| composed[0] = 0; /* no composition for surrogates */ |
| } |
| else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */ |
| /* otherwise ignore it */ |
| } |
| return ret; |
| } |
| |
| /* UTF-8 to wide char string conversion with composition */ |
| /* return -1 on dst buffer overflow, -2 on invalid input char */ |
| static int utf8_mbstowcs_compose( int flags, const char *src, int srclen, WCHAR *dst, int dstlen ) |
| { |
| unsigned int res; |
| const char *srcend = src + srclen; |
| WCHAR composed[2]; |
| WCHAR *dstend = dst + dstlen; |
| |
| if (!dstlen) return get_length_mbs_utf8_compose( flags, src, srclen ); |
| |
| composed[0] = 0; |
| while (src < srcend) |
| { |
| unsigned char ch = *src++; |
| if (ch < 0x80) /* special fast case for 7-bit ASCII */ |
| { |
| if (dst >= dstend) return -1; /* overflow */ |
| *dst++ = composed[0] = ch; |
| continue; |
| } |
| if ((res = decode_utf8_char( ch, &src, srcend )) <= 0xffff) |
| { |
| if (composed[0]) |
| { |
| composed[1] = res; |
| if ((composed[0] = wine_compose( composed ))) |
| { |
| dst[-1] = composed[0]; |
| continue; |
| } |
| } |
| if (dst >= dstend) return -1; /* overflow */ |
| *dst++ = composed[0] = 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); |
| composed[0] = 0; /* no composition for surrogates */ |
| } |
| else if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */ |
| /* otherwise ignore it */ |
| } |
| return dstlen - (dstend - dst); |
| } |
| |
| /* query necessary dst length for src string */ |
| static inline int get_length_mbs_utf8( int flags, 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 = decode_utf8_char( ch, &src, srcend )) <= 0x10ffff) |
| { |
| if (res > 0xffff) ret++; |
| ret++; |
| } |
| else if (flags & MB_ERR_INVALID_CHARS) 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 wine_utf8_mbstowcs( int flags, const char *src, int srclen, WCHAR *dst, int dstlen ) |
| { |
| unsigned int res; |
| const char *srcend = src + srclen; |
| WCHAR *dstend = dst + dstlen; |
| |
| if (flags & MB_COMPOSITE) return utf8_mbstowcs_compose( flags, src, srclen, dst, dstlen ); |
| |
| if (!dstlen) return get_length_mbs_utf8( flags, src, srclen ); |
| |
| while ((dst < dstend) && (src < srcend)) |
| { |
| unsigned char ch = *src++; |
| if (ch < 0x80) /* special fast case for 7-bit ASCII */ |
| { |
| *dst++ = ch; |
| continue; |
| } |
| if ((res = decode_utf8_char( 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 if (flags & MB_ERR_INVALID_CHARS) return -2; /* bad char */ |
| /* otherwise ignore it */ |
| } |
| if (src < srcend) return -1; /* overflow */ |
| return dstlen - (dstend - dst); |
| } |
