/* * Copyright (C) 2005 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <utils/Unicode.h> #include <stddef.h> #ifdef HAVE_WINSOCK # undef nhtol # undef htonl # undef nhtos # undef htons # ifdef HAVE_LITTLE_ENDIAN # define ntohl(x) ( ((x) << 24) | (((x) >> 24) & 255) | (((x) << 8) & 0xff0000) | (((x) >> 8) & 0xff00) ) # define htonl(x) ntohl(x) # define ntohs(x) ( (((x) << 8) & 0xff00) | (((x) >> 8) & 255) ) # define htons(x) ntohs(x) # else # define ntohl(x) (x) # define htonl(x) (x) # define ntohs(x) (x) # define htons(x) (x) # endif #else # include <netinet/in.h> #endif extern "C" { static const char32_t kByteMask = 0x000000BF; static const char32_t kByteMark = 0x00000080; // Surrogates aren't valid for UTF-32 characters, so define some // constants that will let us screen them out. static const char32_t kUnicodeSurrogateHighStart = 0x0000D800; static const char32_t kUnicodeSurrogateHighEnd = 0x0000DBFF; static const char32_t kUnicodeSurrogateLowStart = 0x0000DC00; static const char32_t kUnicodeSurrogateLowEnd = 0x0000DFFF; static const char32_t kUnicodeSurrogateStart = kUnicodeSurrogateHighStart; static const char32_t kUnicodeSurrogateEnd = kUnicodeSurrogateLowEnd; static const char32_t kUnicodeMaxCodepoint = 0x0010FFFF; // Mask used to set appropriate bits in first byte of UTF-8 sequence, // indexed by number of bytes in the sequence. // 0xxxxxxx // -> (00-7f) 7bit. Bit mask for the first byte is 0x00000000 // 110yyyyx 10xxxxxx // -> (c0-df)(80-bf) 11bit. Bit mask is 0x000000C0 // 1110yyyy 10yxxxxx 10xxxxxx // -> (e0-ef)(80-bf)(80-bf) 16bit. Bit mask is 0x000000E0 // 11110yyy 10yyxxxx 10xxxxxx 10xxxxxx // -> (f0-f7)(80-bf)(80-bf)(80-bf) 21bit. Bit mask is 0x000000F0 static const char32_t kFirstByteMark[] = { 0x00000000, 0x00000000, 0x000000C0, 0x000000E0, 0x000000F0 }; // -------------------------------------------------------------------------- // UTF-32 // -------------------------------------------------------------------------- /** * Return number of UTF-8 bytes required for the character. If the character * is invalid, return size of 0. */ static inline size_t utf32_codepoint_utf8_length(char32_t srcChar) { // Figure out how many bytes the result will require. if (srcChar < 0x00000080) { return 1; } else if (srcChar < 0x00000800) { return 2; } else if (srcChar < 0x00010000) { if ((srcChar < kUnicodeSurrogateStart) || (srcChar > kUnicodeSurrogateEnd)) { return 3; } else { // Surrogates are invalid UTF-32 characters. return 0; } } // Max code point for Unicode is 0x0010FFFF. else if (srcChar <= kUnicodeMaxCodepoint) { return 4; } else { // Invalid UTF-32 character. return 0; } } // Write out the source character to <dstP>. static inline void utf32_codepoint_to_utf8(uint8_t* dstP, char32_t srcChar, size_t bytes) { dstP += bytes; switch (bytes) { /* note: everything falls through. */ case 4: *--dstP = (uint8_t)((srcChar | kByteMark) & kByteMask); srcChar >>= 6; case 3: *--dstP = (uint8_t)((srcChar | kByteMark) & kByteMask); srcChar >>= 6; case 2: *--dstP = (uint8_t)((srcChar | kByteMark) & kByteMask); srcChar >>= 6; case 1: *--dstP = (uint8_t)(srcChar | kFirstByteMark[bytes]); } } size_t strlen32(const char32_t *s) { const char32_t *ss = s; while ( *ss ) ss++; return ss-s; } size_t strnlen32(const char32_t *s, size_t maxlen) { const char32_t *ss = s; while ((maxlen > 0) && *ss) { ss++; maxlen--; } return ss-s; } static inline int32_t utf32_at_internal(const char* cur, size_t *num_read) { const char first_char = *cur; if ((first_char & 0x80) == 0) { // ASCII *num_read = 1; return *cur; } cur++; char32_t mask, to_ignore_mask; size_t num_to_read = 0; char32_t utf32 = first_char; for (num_to_read = 1, mask = 0x40, to_ignore_mask = 0xFFFFFF80; (first_char & mask); num_to_read++, to_ignore_mask |= mask, mask >>= 1) { // 0x3F == 00111111 utf32 = (utf32 << 6) + (*cur++ & 0x3F); } to_ignore_mask |= mask; utf32 &= ~(to_ignore_mask << (6 * (num_to_read - 1))); *num_read = num_to_read; return static_cast<int32_t>(utf32); } int32_t utf32_from_utf8_at(const char *src, size_t src_len, size_t index, size_t *next_index) { if (index >= src_len) { return -1; } size_t dummy_index; if (next_index == NULL) { next_index = &dummy_index; } size_t num_read; int32_t ret = utf32_at_internal(src + index, &num_read); if (ret >= 0) { *next_index = index + num_read; } return ret; } ssize_t utf32_to_utf8_length(const char32_t *src, size_t src_len) { if (src == NULL || src_len == 0) { return -1; } size_t ret = 0; const char32_t *end = src + src_len; while (src < end) { ret += utf32_codepoint_utf8_length(*src++); } return ret; } void utf32_to_utf8(const char32_t* src, size_t src_len, char* dst) { if (src == NULL || src_len == 0 || dst == NULL) { return; } const char32_t *cur_utf32 = src; const char32_t *end_utf32 = src + src_len; char *cur = dst; while (cur_utf32 < end_utf32) { size_t len = utf32_codepoint_utf8_length(*cur_utf32); utf32_codepoint_to_utf8((uint8_t *)cur, *cur_utf32++, len); cur += len; } *cur = '\0'; } // -------------------------------------------------------------------------- // UTF-16 // -------------------------------------------------------------------------- int strcmp16(const char16_t *s1, const char16_t *s2) { char16_t ch; int d = 0; while ( 1 ) { d = (int)(ch = *s1++) - (int)*s2++; if ( d || !ch ) break; } return d; } int strncmp16(const char16_t *s1, const char16_t *s2, size_t n) { char16_t ch; int d = 0; while ( n-- ) { d = (int)(ch = *s1++) - (int)*s2++; if ( d || !ch ) break; } return d; } char16_t *strcpy16(char16_t *dst, const char16_t *src) { char16_t *q = dst; const char16_t *p = src; char16_t ch; do { *q++ = ch = *p++; } while ( ch ); return dst; } size_t strlen16(const char16_t *s) { const char16_t *ss = s; while ( *ss ) ss++; return ss-s; } char16_t *strncpy16(char16_t *dst, const char16_t *src, size_t n) { char16_t *q = dst; const char16_t *p = src; char ch; while (n) { n--; *q++ = ch = *p++; if ( !ch ) break; } *q = 0; return dst; } size_t strnlen16(const char16_t *s, size_t maxlen) { const char16_t *ss = s; /* Important: the maxlen test must precede the reference through ss; since the byte beyond the maximum may segfault */ while ((maxlen > 0) && *ss) { ss++; maxlen--; } return ss-s; } int strzcmp16(const char16_t *s1, size_t n1, const char16_t *s2, size_t n2) { const char16_t* e1 = s1+n1; const char16_t* e2 = s2+n2; while (s1 < e1 && s2 < e2) { const int d = (int)*s1++ - (int)*s2++; if (d) { return d; } } return n1 < n2 ? (0 - (int)*s2) : (n1 > n2 ? ((int)*s1 - 0) : 0); } int strzcmp16_h_n(const char16_t *s1H, size_t n1, const char16_t *s2N, size_t n2) { const char16_t* e1 = s1H+n1; const char16_t* e2 = s2N+n2; while (s1H < e1 && s2N < e2) { const char16_t c2 = ntohs(*s2N); const int d = (int)*s1H++ - (int)c2; s2N++; if (d) { return d; } } return n1 < n2 ? (0 - (int)ntohs(*s2N)) : (n1 > n2 ? ((int)*s1H - 0) : 0); } void utf16_to_utf8(const char16_t* src, size_t src_len, char* dst) { if (src == NULL || src_len == 0 || dst == NULL) { return; } const char16_t* cur_utf16 = src; const char16_t* const end_utf16 = src + src_len; char *cur = dst; while (cur_utf16 < end_utf16) { char32_t utf32; // surrogate pairs if ((*cur_utf16 & 0xFC00) == 0xD800) { utf32 = (*cur_utf16++ - 0xD800) << 10; utf32 |= *cur_utf16++ - 0xDC00; utf32 += 0x10000; } else { utf32 = (char32_t) *cur_utf16++; } const size_t len = utf32_codepoint_utf8_length(utf32); utf32_codepoint_to_utf8((uint8_t*)cur, utf32, len); cur += len; } *cur = '\0'; } // -------------------------------------------------------------------------- // UTF-8 // -------------------------------------------------------------------------- ssize_t utf8_length(const char *src) { const char *cur = src; size_t ret = 0; while (*cur != '\0') { const char first_char = *cur++; if ((first_char & 0x80) == 0) { // ASCII ret += 1; continue; } // (UTF-8's character must not be like 10xxxxxx, // but 110xxxxx, 1110xxxx, ... or 1111110x) if ((first_char & 0x40) == 0) { return -1; } int32_t mask, to_ignore_mask; size_t num_to_read = 0; char32_t utf32 = 0; for (num_to_read = 1, mask = 0x40, to_ignore_mask = 0x80; num_to_read < 5 && (first_char & mask); num_to_read++, to_ignore_mask |= mask, mask >>= 1) { if ((*cur & 0xC0) != 0x80) { // must be 10xxxxxx return -1; } // 0x3F == 00111111 utf32 = (utf32 << 6) + (*cur++ & 0x3F); } // "first_char" must be (110xxxxx - 11110xxx) if (num_to_read == 5) { return -1; } to_ignore_mask |= mask; utf32 |= ((~to_ignore_mask) & first_char) << (6 * (num_to_read - 1)); if (utf32 > kUnicodeMaxCodepoint) { return -1; } ret += num_to_read; } return ret; } ssize_t utf16_to_utf8_length(const char16_t *src, size_t src_len) { if (src == NULL || src_len == 0) { return -1; } size_t ret = 0; const char16_t* const end = src + src_len; while (src < end) { if ((*src & 0xFC00) == 0xD800 && (src + 1) < end && (*++src & 0xFC00) == 0xDC00) { // surrogate pairs are always 4 bytes. ret += 4; src++; } else { ret += utf32_codepoint_utf8_length((char32_t) *src++); } } return ret; } /** * Returns 1-4 based on the number of leading bits. * * 1111 -> 4 * 1110 -> 3 * 110x -> 2 * 10xx -> 1 * 0xxx -> 1 */ static inline size_t utf8_codepoint_len(uint8_t ch) { return ((0xe5000000 >> ((ch >> 3) & 0x1e)) & 3) + 1; } static inline void utf8_shift_and_mask(uint32_t* codePoint, const uint8_t byte) { *codePoint <<= 6; *codePoint |= 0x3F & byte; } size_t utf8_to_utf32_length(const char *src, size_t src_len) { if (src == NULL || src_len == 0) { return 0; } size_t ret = 0; const char* cur; const char* end; size_t num_to_skip; for (cur = src, end = src + src_len, num_to_skip = 1; cur < end; cur += num_to_skip, ret++) { const char first_char = *cur; num_to_skip = 1; if ((first_char & 0x80) == 0) { // ASCII continue; } int32_t mask; for (mask = 0x40; (first_char & mask); num_to_skip++, mask >>= 1) { } } return ret; } void utf8_to_utf32(const char* src, size_t src_len, char32_t* dst) { if (src == NULL || src_len == 0 || dst == NULL) { return; } const char* cur = src; const char* const end = src + src_len; char32_t* cur_utf32 = dst; while (cur < end) { size_t num_read; *cur_utf32++ = static_cast<char32_t>(utf32_at_internal(cur, &num_read)); cur += num_read; } *cur_utf32 = 0; } static inline uint32_t utf8_to_utf32_codepoint(const uint8_t *src, size_t length) { uint32_t unicode; switch (length) { case 1: return src[0]; case 2: unicode = src[0] & 0x1f; utf8_shift_and_mask(&unicode, src[1]); return unicode; case 3: unicode = src[0] & 0x0f; utf8_shift_and_mask(&unicode, src[1]); utf8_shift_and_mask(&unicode, src[2]); return unicode; case 4: unicode = src[0] & 0x07; utf8_shift_and_mask(&unicode, src[1]); utf8_shift_and_mask(&unicode, src[2]); utf8_shift_and_mask(&unicode, src[3]); return unicode; default: return 0xffff; } //printf("Char at %p: len=%d, utf-16=%p\n", src, length, (void*)result); } ssize_t utf8_to_utf16_length(const uint8_t* u8str, size_t u8len) { const uint8_t* const u8end = u8str + u8len; const uint8_t* u8cur = u8str; /* Validate that the UTF-8 is the correct len */ size_t u16measuredLen = 0; while (u8cur < u8end) { u16measuredLen++; int u8charLen = utf8_codepoint_len(*u8cur); uint32_t codepoint = utf8_to_utf32_codepoint(u8cur, u8charLen); if (codepoint > 0xFFFF) u16measuredLen++; // this will be a surrogate pair in utf16 u8cur += u8charLen; } /** * Make sure that we ended where we thought we would and the output UTF-16 * will be exactly how long we were told it would be. */ if (u8cur != u8end) { return -1; } return u16measuredLen; } char16_t* utf8_to_utf16_no_null_terminator(const uint8_t* u8str, size_t u8len, char16_t* u16str) { const uint8_t* const u8end = u8str + u8len; const uint8_t* u8cur = u8str; char16_t* u16cur = u16str; while (u8cur < u8end) { size_t u8len = utf8_codepoint_len(*u8cur); uint32_t codepoint = utf8_to_utf32_codepoint(u8cur, u8len); // Convert the UTF32 codepoint to one or more UTF16 codepoints if (codepoint <= 0xFFFF) { // Single UTF16 character *u16cur++ = (char16_t) codepoint; } else { // Multiple UTF16 characters with surrogates codepoint = codepoint - 0x10000; *u16cur++ = (char16_t) ((codepoint >> 10) + 0xD800); *u16cur++ = (char16_t) ((codepoint & 0x3FF) + 0xDC00); } u8cur += u8len; } return u16cur; } void utf8_to_utf16(const uint8_t* u8str, size_t u8len, char16_t* u16str) { char16_t* end = utf8_to_utf16_no_null_terminator(u8str, u8len, u16str); *end = 0; } }