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459 lines
11 KiB
C++
459 lines
11 KiB
C++
/*
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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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#ifdef _WIN32
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#include <windows.h>
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#undef min
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#undef max
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#endif
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#include <cstdlib>
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#include <cstring>
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#include <algorithm>
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#include "common/common_types.h"
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#include "common/utf8.h"
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// is start of UTF sequence
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inline bool isutf(char c) {
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return (c & 0xC0) != 0x80;
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}
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static const u32 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 u8 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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int u8_seqlen(const 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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int u8_toucs(u32 *dest, int sz, const char *src, int srcsz)
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{
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u32 ch;
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const 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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int u8_toutf8(char *dest, int sz, u32 *src, int srcsz)
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{
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u32 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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int u8_wc_toutf8(char *dest, u32 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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int u8_offset(const 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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int u8_charnum(const 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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int u8_strlen(const 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 (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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u32 u8_nextchar(const char *s, int *i)
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{
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u32 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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void u8_inc(const 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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void u8_dec(const 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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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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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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int u8_read_escape_sequence(const char *str, u32 *dest)
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{
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u32 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 = (u32)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, nullptr, 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, nullptr, 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, nullptr, 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, nullptr, 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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int u8_unescape(char *buf, int sz, char *src)
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{
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int c=0, amt;
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u32 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 = u8_read_escape_sequence(src, &ch);
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}
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else {
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ch = (u32)*src;
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amt = 1;
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}
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src += amt;
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amt = 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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const char *u8_strchr(const char *s, u32 ch, int *charn)
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{
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int i = 0, lasti=0;
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u32 c;
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*charn = 0;
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while (s[i]) {
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c = 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 nullptr;
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}
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const char *u8_memchr(const char *s, u32 ch, size_t sz, int *charn)
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{
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u32 i = 0, lasti=0;
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u32 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 nullptr;
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}
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int u8_is_locale_utf8(const 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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int UTF8StringNonASCIICount(const char *utf8string) {
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UTF8 utf(utf8string);
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int count = 0;
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while (!utf.end()) {
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int c = utf.next();
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if (c > 127)
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++count;
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}
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return count;
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}
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bool UTF8StringHasNonASCII(const char *utf8string) {
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return UTF8StringNonASCIICount(utf8string) > 0;
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}
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#ifdef _WIN32
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std::string ConvertWStringToUTF8(const wchar_t *wstr) {
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int len = (int)wcslen(wstr);
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int size = (int)WideCharToMultiByte(CP_UTF8, 0, wstr, len, 0, 0, nullptr, nullptr);
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std::string s;
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s.resize(size);
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if (size > 0) {
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WideCharToMultiByte(CP_UTF8, 0, wstr, len, &s[0], size, nullptr, nullptr);
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}
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return s;
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}
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std::string ConvertWStringToUTF8(const std::wstring &wstr) {
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int len = (int)wstr.size();
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int size = (int)WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), len, 0, 0, nullptr, nullptr);
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std::string s;
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s.resize(size);
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if (size > 0) {
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WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), len, &s[0], size, nullptr, nullptr);
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}
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return s;
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}
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void ConvertUTF8ToWString(wchar_t *dest, size_t destSize, const std::string &source) {
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int len = (int)source.size();
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int size = (int)MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, nullptr, 0);
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MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, dest, std::min((int)destSize, size));
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}
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std::wstring ConvertUTF8ToWString(const std::string &source) {
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int len = (int)source.size();
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int size = (int)MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, nullptr, 0);
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std::wstring str;
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str.resize(size);
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if (size > 0) {
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MultiByteToWideChar(CP_UTF8, 0, source.c_str(), len, &str[0], size);
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}
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return str;
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}
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#endif |