484 lines
12 KiB
C
484 lines
12 KiB
C
/*
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* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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* Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
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*
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* Version: MPL 1.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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*
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* The Initial Developer of the Original Code is
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* Seven Du <dujinfang@gmail.com>
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* Portions created by the Initial Developer are Copyright (C)
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Anthony Minessale II <anthm@freeswitch.org>
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*
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*
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* switch_utf8.c UTf8
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*
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*/
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#include "switch_utf8.h"
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/*
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Basic UTF-8 manipulation routines
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by Jeff Bezanson
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placed in the public domain Fall 2005
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This code is designed to provide the utilities you need to manipulate
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UTF-8 as an internal string encoding. These functions do not perform the
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error checking normally needed when handling UTF-8 data, so if you happen
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to be from the Unicode Consortium you will want to flay me alive.
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I do this because error checking can be performed at the boundaries (I/O),
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with these routines reserved for higher performance on data known to be
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valid.
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*/
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static const uint32_t offsetsFromUTF8[6] = {
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0x00000000UL, 0x00003080UL, 0x000E2080UL,
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0x03C82080UL, 0xFA082080UL, 0x82082080UL
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};
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static const char trailingBytesForUTF8[256] = {
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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,
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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,
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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,
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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,
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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,
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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,
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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,
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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
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};
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/* returns length of next utf-8 sequence */
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SWITCH_DECLARE(int) switch_u8_seqlen(char *s)
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{
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return trailingBytesForUTF8[(unsigned int)(unsigned char)s[0]] + 1;
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}
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/* conversions without error checking
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only works for valid UTF-8, i.e. no 5- or 6-byte sequences
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srcsz = source size in bytes, or -1 if 0-terminated
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sz = dest size in # of wide characters
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returns # characters converted
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dest will always be L'\0'-terminated, even if there isn't enough room
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for all the characters.
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if sz = srcsz+1 (i.e. 4*srcsz+4 bytes), there will always be enough space.
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*/
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SWITCH_DECLARE(int) switch_u8_toucs(uint32_t *dest, int sz, char *src, int srcsz)
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{
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uint32_t ch;
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char *src_end = src + srcsz;
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int nb;
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int i=0;
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while (i < sz-1) {
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nb = trailingBytesForUTF8[(unsigned char)*src];
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if (srcsz == -1) {
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if (*src == 0)
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goto done_toucs;
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}
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else {
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if (src + nb >= src_end)
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goto done_toucs;
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}
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ch = 0;
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switch (nb) {
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/* these fall through deliberately */
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case 3: ch += (unsigned char)*src++; ch <<= 6;
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case 2: ch += (unsigned char)*src++; ch <<= 6;
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case 1: ch += (unsigned char)*src++; ch <<= 6;
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case 0: ch += (unsigned char)*src++;
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}
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ch -= offsetsFromUTF8[nb];
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dest[i++] = ch;
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}
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done_toucs:
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dest[i] = 0;
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return i;
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}
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/* srcsz = number of source characters, or -1 if 0-terminated
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sz = size of dest buffer in bytes
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returns # characters converted
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dest will only be '\0'-terminated if there is enough space. this is
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for consistency; imagine there are 2 bytes of space left, but the next
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character requires 3 bytes. in this case we could NUL-terminate, but in
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general we can't when there's insufficient space. therefore this function
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only NUL-terminates if all the characters fit, and there's space for
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the NUL as well.
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the destination string will never be bigger than the source string.
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*/
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SWITCH_DECLARE(int) switch_u8_toutf8(char *dest, int sz, uint32_t *src, int srcsz)
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{
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uint32_t ch;
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int i = 0;
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char *dest_end = dest + sz;
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while (srcsz<0 ? src[i]!=0 : i < srcsz) {
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ch = src[i];
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if (ch < 0x80) {
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if (dest >= dest_end)
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return i;
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*dest++ = (char)ch;
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}
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else if (ch < 0x800) {
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if (dest >= dest_end-1)
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return i;
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*dest++ = (ch>>6) | 0xC0;
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*dest++ = (ch & 0x3F) | 0x80;
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}
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else if (ch < 0x10000) {
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if (dest >= dest_end-2)
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return i;
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*dest++ = (ch>>12) | 0xE0;
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*dest++ = ((ch>>6) & 0x3F) | 0x80;
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*dest++ = (ch & 0x3F) | 0x80;
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}
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else if (ch < 0x110000) {
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if (dest >= dest_end-3)
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return i;
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*dest++ = (ch>>18) | 0xF0;
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*dest++ = ((ch>>12) & 0x3F) | 0x80;
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*dest++ = ((ch>>6) & 0x3F) | 0x80;
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*dest++ = (ch & 0x3F) | 0x80;
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}
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i++;
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}
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if (dest < dest_end)
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*dest = '\0';
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return i;
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}
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SWITCH_DECLARE(int) switch_u8_wc_toutf8(char *dest, uint32_t ch)
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{
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if (ch < 0x80) {
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dest[0] = (char)ch;
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return 1;
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}
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if (ch < 0x800) {
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dest[0] = (ch>>6) | 0xC0;
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dest[1] = (ch & 0x3F) | 0x80;
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return 2;
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}
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if (ch < 0x10000) {
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dest[0] = (ch>>12) | 0xE0;
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dest[1] = ((ch>>6) & 0x3F) | 0x80;
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dest[2] = (ch & 0x3F) | 0x80;
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return 3;
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}
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if (ch < 0x110000) {
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dest[0] = (ch>>18) | 0xF0;
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dest[1] = ((ch>>12) & 0x3F) | 0x80;
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dest[2] = ((ch>>6) & 0x3F) | 0x80;
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dest[3] = (ch & 0x3F) | 0x80;
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return 4;
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}
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return 0;
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}
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/* charnum => byte offset */
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SWITCH_DECLARE(int) switch_u8_offset(char *str, int charnum)
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{
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int offs=0;
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while (charnum > 0 && str[offs]) {
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(void)(isutf(str[++offs]) || isutf(str[++offs]) ||
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isutf(str[++offs]) || ++offs);
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charnum--;
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}
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return offs;
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}
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/* byte offset => charnum */
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SWITCH_DECLARE(int) switch_u8_charnum(char *s, int offset)
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{
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int charnum = 0, offs=0;
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while (offs < offset && s[offs]) {
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(void)(isutf(s[++offs]) || isutf(s[++offs]) ||
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isutf(s[++offs]) || ++offs);
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charnum++;
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}
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return charnum;
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}
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/* number of characters */
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SWITCH_DECLARE(int) switch_u8_strlen(char *s)
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{
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int count = 0;
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int i = 0;
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while (switch_u8_nextchar(s, &i) != 0)
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count++;
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return count;
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}
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/* reads the next utf-8 sequence out of a string, updating an index */
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SWITCH_DECLARE(uint32_t) switch_u8_nextchar(char *s, int *i)
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{
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uint32_t ch = 0;
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int sz = 0;
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do {
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ch <<= 6;
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ch += (unsigned char)s[(*i)++];
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sz++;
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} while (s[*i] && !isutf(s[*i]));
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ch -= offsetsFromUTF8[sz-1];
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return ch;
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}
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SWITCH_DECLARE(void) switch_u8_inc(char *s, int *i)
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{
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(void)(isutf(s[++(*i)]) || isutf(s[++(*i)]) ||
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isutf(s[++(*i)]) || ++(*i));
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}
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SWITCH_DECLARE(void) switch_u8_dec(char *s, int *i)
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{
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(void)(isutf(s[--(*i)]) || isutf(s[--(*i)]) ||
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isutf(s[--(*i)]) || --(*i));
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}
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SWITCH_DECLARE(int) octal_digit(char c)
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{
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return (c >= '0' && c <= '7');
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}
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SWITCH_DECLARE(int) hex_digit(char c)
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{
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return ((c >= '0' && c <= '9') ||
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(c >= 'A' && c <= 'F') ||
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(c >= 'a' && c <= 'f'));
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}
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/* assumes that src points to the character after a backslash
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returns number of input characters processed */
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SWITCH_DECLARE(int) switch_u8_read_escape_sequence(char *str, uint32_t *dest)
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{
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uint32_t ch;
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char digs[9]="\0\0\0\0\0\0\0\0";
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int dno=0, i=1;
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ch = (uint32_t)str[0]; /* take literal character */
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if (str[0] == 'n')
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ch = L'\n';
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else if (str[0] == 't')
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ch = L'\t';
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else if (str[0] == 'r')
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ch = L'\r';
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else if (str[0] == 'b')
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ch = L'\b';
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else if (str[0] == 'f')
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ch = L'\f';
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else if (str[0] == 'v')
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ch = L'\v';
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else if (str[0] == 'a')
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ch = L'\a';
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else if (octal_digit(str[0])) {
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i = 0;
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do {
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digs[dno++] = str[i++];
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} while (octal_digit(str[i]) && dno < 3);
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ch = strtol(digs, NULL, 8);
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}
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else if (str[0] == 'x') {
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while (hex_digit(str[i]) && dno < 2) {
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digs[dno++] = str[i++];
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}
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if (dno > 0)
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ch = strtol(digs, NULL, 16);
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}
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else if (str[0] == 'u') {
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while (hex_digit(str[i]) && dno < 4) {
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digs[dno++] = str[i++];
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}
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if (dno > 0)
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ch = strtol(digs, NULL, 16);
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}
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else if (str[0] == 'U') {
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while (hex_digit(str[i]) && dno < 8) {
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digs[dno++] = str[i++];
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}
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if (dno > 0)
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ch = strtol(digs, NULL, 16);
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}
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*dest = ch;
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return i;
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}
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/* convert a string with literal \uxxxx or \Uxxxxxxxx characters to UTF-8
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example: u8_unescape(mybuf, 256, "hello\\u220e")
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note the double backslash is needed if called on a C string literal */
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SWITCH_DECLARE(int) switch_u8_unescape(char *buf, int sz, char *src)
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{
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int c=0, amt;
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uint32_t ch;
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char temp[4];
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while (*src && c < sz) {
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if (*src == '\\') {
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src++;
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amt = switch_u8_read_escape_sequence(src, &ch);
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}
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else {
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ch = (uint32_t)*src;
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amt = 1;
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}
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src += amt;
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amt = switch_u8_wc_toutf8(temp, ch);
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if (amt > sz-c)
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break;
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memcpy(&buf[c], temp, amt);
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c += amt;
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}
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if (c < sz)
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buf[c] = '\0';
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return c;
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}
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SWITCH_DECLARE(int) switch_u8_escape_wchar(char *buf, int sz, uint32_t ch)
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{
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if (ch == L'\n')
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return snprintf(buf, sz, "\\n");
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else if (ch == L'\t')
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return snprintf(buf, sz, "\\t");
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else if (ch == L'\r')
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return snprintf(buf, sz, "\\r");
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else if (ch == L'\b')
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return snprintf(buf, sz, "\\b");
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else if (ch == L'\f')
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return snprintf(buf, sz, "\\f");
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else if (ch == L'\v')
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return snprintf(buf, sz, "\\v");
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else if (ch == L'\a')
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return snprintf(buf, sz, "\\a");
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else if (ch == L'\\')
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return snprintf(buf, sz, "\\\\");
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else if (ch < 32 || ch == 0x7f)
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return snprintf(buf, sz, "\\x%hhX", (unsigned char)ch);
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else if (ch > 0xFFFF)
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return snprintf(buf, sz, "\\U%.8X", (uint32_t)ch);
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else if (ch >= 0x80 && ch <= 0xFFFF)
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return snprintf(buf, sz, "\\u%.4hX", (unsigned short)ch);
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return snprintf(buf, sz, "%c", (char)ch);
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}
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SWITCH_DECLARE(int) switch_u8_escape(char *buf, int sz, char *src, int escape_quotes)
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{
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int c=0, i=0, amt;
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while (src[i] && c < sz) {
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if (escape_quotes && src[i] == '"') {
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amt = snprintf(buf, sz - c, "\\\"");
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i++;
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}
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else {
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amt = switch_u8_escape_wchar(buf, sz - c, switch_u8_nextchar(src, &i));
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}
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c += amt;
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buf += amt;
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}
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if (c < sz)
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*buf = '\0';
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return c;
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}
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SWITCH_DECLARE(char *) switch_u8_strchr(char *s, uint32_t ch, int *charn)
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{
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int i = 0, lasti=0;
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uint32_t c;
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*charn = 0;
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while (s[i]) {
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c = switch_u8_nextchar(s, &i);
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if (c == ch) {
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return &s[lasti];
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}
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lasti = i;
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(*charn)++;
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}
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return NULL;
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}
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SWITCH_DECLARE(char *) switch_u8_memchr(char *s, uint32_t ch, size_t sz, int *charn)
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{
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int i = 0, lasti=0;
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uint32_t c;
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int csz;
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*charn = 0;
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while (i < sz) {
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c = csz = 0;
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do {
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c <<= 6;
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c += (unsigned char)s[i++];
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csz++;
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} while (i < sz && !isutf(s[i]));
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c -= offsetsFromUTF8[csz-1];
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if (c == ch) {
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return &s[lasti];
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}
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lasti = i;
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(*charn)++;
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}
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return NULL;
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}
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SWITCH_DECLARE(int) switch_u8_is_locale_utf8(char *locale)
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{
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/* this code based on libutf8 */
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const char* cp = locale;
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for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++) {
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if (*cp == '.') {
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const char* encoding = ++cp;
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for (; *cp != '\0' && *cp != '@' && *cp != '+' && *cp != ','; cp++)
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;
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if ((cp-encoding == 5 && !strncmp(encoding, "UTF-8", 5))
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|| (cp-encoding == 4 && !strncmp(encoding, "utf8", 4)))
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return 1; /* it's UTF-8 */
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break;
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}
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}
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return 0;
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}
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/* reads the next utf-8 sequence out of a string, updating an index */
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SWITCH_DECLARE(uint32_t) switch_u8_get_char(char *s, int *i)
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{
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uint32_t ch = 0;
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int sz = 0;
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do {
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ch <<= 6;
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ch += (unsigned char)s[(*i)++];
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sz++;
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} while (s[*i] && !isutf(s[*i]));
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ch -= offsetsFromUTF8[sz-1];
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return ch;
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}
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