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encoding_cvt.c
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encoding_cvt.c
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/**
* @author : liuxuan, liu20076@sina.com
* @date : 2012-09-02
* @see : ASCII, GBK, GB-2312, BIG-5, UTF-8
*/
#include "encoding_cvt.h"
#include <string.h>
#include <stddef.h>
#include <errno.h>
/**
ascii [0x00,0x7f]
*/
int32_t is_str_ascii(const char* str, uint32_t str_len)
{
const char* end = str + str_len;
for( ; str<end; ++str)
{
if(*str&0x80) return 0;
}
return 1;
}
/**
UTF-8的编码方式
0xxxxxxx
110xxxxx 10xxxxxx
1110xxxx 10xxxxxx 10xxxxxx
11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
*/
int32_t is_str_utf8(const char* str, uint32_t str_len)
{
const uint8_t* p = (const uint8_t*)str;
const uint8_t* end = p + str_len;
for( ; p<end; ++p)
{
if(*p&0x80){
if(*p<0xC0) return 0;
else if(*p<0xE0) goto L_2_BYTES;
else if(*p<0xF0) goto L_3_BYTES;
else if(*p<0xF8) goto L_4_BYTES;
else if(*p<0xFC) goto L_5_BYTES;
else if(*p<0xFE) goto L_6_BYTES;
else return 0;
L_6_BYTES:
if((*++p&0xC0)!=0x80) return 0;
L_5_BYTES:
if((*++p&0xC0)!=0x80) return 0;
L_4_BYTES:
if((*++p&0xC0)!=0x80) return 0;
L_3_BYTES:
if((*++p&0xC0)!=0x80) return 0;
L_2_BYTES:
if((*++p&0xC0)!=0x80) return 0;
}
}
return 1;
}
/*
@return 常用字符的个数。ASCII不参与计算。
*/
uint32_t get_str_utf8_char_number(const char* str, uint32_t str_len,
uint32_t* p_non_common_utf8_num,
uint32_t* p_invalid_num)
{
uint32_t common_utf8_char_num = 0;
uint32_t non_common_utf8_char_num = 0;
uint32_t invalid_num = 0;
const uint8_t* p = (const uint8_t*)str;
const uint8_t* end = p + str_len;
while(p<end)
{
if(*p&0x80)
{
uint32_t* p_num = &non_common_utf8_char_num;
//首字节,应大于等于 11000000 并且小于等于 11111101
if (*p < 0xC0){ ++invalid_num; ++p; continue; }
else if(*p<0xE0) goto L_2_BYTES;
else if (*p<0xF0){ p_num = &common_utf8_char_num; goto L_3_BYTES; }
else if(*p<0xF8) goto L_4_BYTES;
else if(*p<0xFC) goto L_5_BYTES;
else if(*p<0xFE) goto L_6_BYTES;
else{ ++invalid_num; ++p; continue; }
//非首字节,应为 10xxxxxx
L_6_BYTES:
if ((*++p & 0xC0) != 0x80){ ++invalid_num; continue; }
L_5_BYTES:
if ((*++p & 0xC0) != 0x80){ ++invalid_num; continue; }
L_4_BYTES:
if ((*++p & 0xC0) != 0x80){ ++invalid_num; continue; }
L_3_BYTES:
if ((*++p & 0xC0) != 0x80){ ++invalid_num; continue; }
L_2_BYTES:
if ((*++p & 0xC0) != 0x80){ ++invalid_num; continue; }
++*p_num;
++p;
}
else ++p;
}
if (p_non_common_utf8_num != NULL)*p_non_common_utf8_num = non_common_utf8_char_num;
if (p_invalid_num != NULL)*p_invalid_num = invalid_num;
return common_utf8_char_num;
}
/*
@return 当中日韩字符占比大于80%时返回真
*/
int32_t predict_str_utf8(const char* str, uint32_t str_len)
{
uint32_t non_common_num, invalid_num;
uint32_t common_num = get_str_utf8_char_number(str, str_len, &non_common_num, &invalid_num);
return invalid_num == 0 && common_num > 4 * non_common_num;
}
uint32_t translate_utf8_char_to_ucs4(const char* s, const char** endptr)
{
uint32_t ucs4 = 0;
const uint8_t* p = (const uint8_t*)s;
if (*p < 0xC0)
{
++p;
goto L_END;
}
else if (*p < 0xE0)
{
ucs4 = *p & 0x1f;
goto L_2_BYTES;
}
else if (*p < 0xF0)
{
ucs4 = *p & 0xf;
goto L_3_BYTES;
}
else if (*p < 0xF8)
{
ucs4 = *p & 0x7;
goto L_4_BYTES;
}
else if (*p < 0xFC)
{
ucs4 = *p & 0x3;
goto L_5_BYTES;
}
else if (*p < 0xFE)
{
ucs4 = *p & 0x1;
goto L_6_BYTES;
}
else
{
++p;
goto L_END;
}
L_6_BYTES:
if ((*++p & 0xC0) != 0x80) goto L_END;
ucs4 = (ucs4 << 6) | (*p & 0x3f);
L_5_BYTES:
if ((*++p & 0xC0) != 0x80) goto L_END;
ucs4 = (ucs4 << 6) | (*p & 0x3f);
L_4_BYTES:
if ((*++p & 0xC0) != 0x80) goto L_END;
ucs4 = (ucs4 << 6) | (*p & 0x3f);
L_3_BYTES:
if ((*++p & 0xC0) != 0x80) goto L_END;
ucs4 = (ucs4 << 6) | (*p & 0x3f);
L_2_BYTES:
if ((*++p & 0xC0) != 0x80) goto L_END;
ucs4 = (ucs4 << 6) | (*p & 0x3f);
++p;
L_END:
if (endptr)
{
*endptr = (const char*)p;
}
return ucs4;
}
uint32_t utf8_next_char(const char* s, const char** endptr)
{
if (*s & 0x80) return translate_utf8_char_to_ucs4(s, endptr);
else
{
if (endptr) *endptr = s + 1;
return (uint8_t)*s;
}
}
uint32_t utf8_fill_question_mark(char** in)
{
*(*in)++ = 0xef;
*(*in)++ = 0xbc;
*(*in)++ = 0x9f;
return 3;
}
/**
GBK的编码范围
范围 第1字节 第2字节 编码数 字数 备注
标准GBK/1 A1–A9 A1–FE 846 717 符号717个
标准GBK/2 B0–F7 A1–FE 6768 6763 GB2312汉字6763个(常用字)
标准GBK/3 81–A0 40–FE(7F除外) 6080 6080 GB13000.1中的CJK汉字6080个
标准GBK/4 AA–FE 40–A0(7F除外) 8160 8160 CJK汉字和增补的汉字8160个
标准GBK/5 A8–A9 40–A0(7F除外) 192 166 BIG5非汉字符号、结构符166个
用户定义 AA–AF A1–FE 564
用户定义 F8–FE A1–FE 658
用户定义 A1–A7 40–A0(7F除外) 672
合计: 23940 21886
*/
static const char seg12[] =
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00";
static const char seg3[] =
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00";
static const char seg45[] =
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x00"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
"\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
static const char* const _gb2312_segment[] =
{
#if 0
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
#endif
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, NULL, NULL, NULL, NULL, NULL, NULL,
seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12,
seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12,
seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12,
seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12,
seg12, seg12, seg12, seg12, seg12, seg12, seg12, seg12, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
};
static const char* const * gb2312_segment = _gb2312_segment - 16 * 8;
static const char* const _gbk_other_segment[] =
{
#if 0
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
#endif
NULL, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3,
seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3, seg3,
seg3, NULL, NULL, NULL, NULL, NULL, NULL, NULL, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45,
seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45,
seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45,
seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45,
seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45,
seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, seg45, NULL,
};
static const char* const * gbk_other_segment = _gbk_other_segment - 16 * 8;
static const char* const _user_segment[] =
{
#if 0
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
#endif
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, seg45, seg45, seg45, seg45, seg45, seg45, seg45, NULL, NULL, seg12, seg12, seg12, seg12, seg12, seg12,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, seg12, seg12, seg12, seg12, seg12, seg12, seg12, NULL,
};
static const char* const * user_segment = _user_segment - 16 * 8;
/**
@return 1 if str match gbk, but str may be another charset encoding like utf8,big5,etc.
*/
int32_t is_str_gbk(const char* str, uint32_t str_len)
{
const uint8_t* p = (const uint8_t*)str;
const uint8_t* end = p + str_len;
while (p < end)
{
if(*p&0x80)
{
const char* seg = gb2312_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
seg = gbk_other_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
seg = user_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
return 0; //invalid char
L_NEXT_CHAR:
p += 2;
}
else ++p;
}
return 1;
}
/*
@return 常用字符的个数。ASCII码不参与计算。
*/
uint32_t get_str_gbk_char_number(const char* str, uint32_t str_len,
uint32_t* p_non_common_gbk_num,
uint32_t* p_invalid_num)
{
uint32_t common_gbk_char_num = 0;
uint32_t non_common_gbk_char_num = 0;
uint32_t invalid_num = 0;
const uint8_t* p = (const uint8_t*)str;
const uint8_t* end = p + str_len;
while (p < end)
{
if (*p & 0x80)
{
const char* seg = gb2312_segment[*p];
if (seg != NULL && seg[p[1]] != 0)
{
if (*p < 0xd8) goto L_GB2312_CHAR; //符号和一级汉字
else goto L_NEXT_CHAR; //二级汉字
}
seg = gbk_other_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
seg = user_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
//invalid char
++invalid_num;
++p;
continue;
L_GB2312_CHAR:
++common_gbk_char_num;
p += 2;
continue;
L_NEXT_CHAR:
++non_common_gbk_char_num;
p += 2;
continue;
}
else ++p;
}
if (p_non_common_gbk_num != NULL)*p_non_common_gbk_num = non_common_gbk_char_num;
if (p_invalid_num != NULL) *p_invalid_num = invalid_num;
return common_gbk_char_num;
}
/**
@return 1 if str match gbk, and the GB2312 character proportion exceeds 80%
*/
int32_t predict_str_gbk(const char* str, uint32_t str_len)
{
uint32_t non_common_num, invalid_num;
uint32_t common_num = get_str_gbk_char_number(str, str_len, &non_common_num, &invalid_num);
return invalid_num == 0 && common_num > 4 * common_num;
}
uint32_t gbk_next_char(const char* in, const char** endptr)
{
const uint8_t* p = (const uint8_t*)in;
if (*p & 0x80)
{
const char* seg = gb2312_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
seg = gbk_other_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
seg = user_segment[*p];
if (seg != NULL && seg[p[1]] != 0) goto L_NEXT_CHAR;
//invalid char
if (endptr) *endptr = in + 1;
return 0;
L_NEXT_CHAR:
if (endptr) *endptr = in + 2;
return (*p << 8) | p[1];
}
else
{
if (endptr) *endptr = in + 1;
return *p;
}
}
uint32_t gbk_fill_question_mark(char** in)
{
*(*in)++ = 0xa3;
*(*in)++ = 0xbf;
return 2;
}
/**
BIG5的编码方式
0x8140-0xA0FE 保留给用户自定义字符（造字区），目前未用
0xA140-0xA3BF 标点符号、希腊字母及特殊符号
0xA3C0-0xA3FE 保留。此区没有开放作造字区用
0xA3C0-0xA3E0 33个控制字符图象，倚天中文系统扩充
0xA3E1 欧元（€）符号，Windows Code Page 950
0xA440-0xC67E 常用汉字，先按笔划再按部首排序
0xC6A1-0xC8FE 保留给用户自定义字符（造字区）
0xC6A1-0xC875 章节符号、部首及笔划结构、其他字母符号，倚天中文系统扩充
0xC940-0xF9D5 次常用汉字，先按笔划再按部首排序
0xF9D6-0xFEFE 保留给用户自定义字符（造字区）
0xF9D6-0xF9FE 扩充字及制表符，倚天中文系统扩充
*/
/**
@return 1 if str match big5, but str may be another charset encoding like utf8,gbk,etc.
*/
int32_t is_str_big5(const char* str, uint32_t str_len)
{
const uint8_t* p = (const uint8_t*)str;
const uint8_t* end = p + str_len;
for( ; p<end; ++p)
{
if(*p&0x80){
uint16_t big5_char_value = *p<<8;
big5_char_value |= *++p;
if(0xA140<=big5_char_value && big5_char_value<=0xF9FE)
{
if(big5_char_value<=0xA3E1)
{ //标点符号,ok
}
else if(big5_char_value<0xA440) return 0;
else if(big5_char_value<=0xC67E)
{ //常用汉字,ok
}
else if(big5_char_value<0xC6A1) return 0;
else if(big5_char_value<=0xC875)
{ //倚天中文系统扩充,ok
}
else if(big5_char_value<0xC940) return 0;
else
{ //次常用汉字，倚天中文系统扩充,ok
}
}
else
{
if (0x8140 <= big5_char_value && big5_char_value <= 0xA0FE)
{ //造字区
}
else if (0xF9FE < big5_char_value && big5_char_value <= 0xFEFE)
{ //造字区
}
else return 0;
}
}
}
return 1;
}
/*
@return 常用字符的个数。ASCII码不参与计算。
*/
uint32_t get_str_big5_char_number(const char* str, uint32_t str_len,
uint32_t* p_non_common_big5_num,
uint32_t* p_invalid_num)
{
uint32_t common_big5_char_num = 0;
uint32_t non_common_big5_char_num = 0;
uint32_t invalid_num = 0;
const uint8_t* p = (const uint8_t*)str;
const uint8_t* end = p + str_len;
for (; p<end; ++p)
{
if (*p & 0x80){
uint16_t big5_char_value = *p << 8;
big5_char_value |= *++p;
if (0xA140 <= big5_char_value && big5_char_value <= 0xF9FE)
{
if (big5_char_value <= 0xA3E1)
{ //标点符号,ok
++common_big5_char_num;
}
else if (big5_char_value < 0xA440) --p, ++invalid_num;
else if (big5_char_value <= 0xC67E)
{ //常用汉字,ok
++common_big5_char_num;
}
else if (big5_char_value<0xC6A1) --p, ++invalid_num;
else if (big5_char_value <= 0xC875)
{ //倚天中文系统扩充,ok
++non_common_big5_char_num;
}
else if (big5_char_value<0xC940) --p, ++invalid_num;
else
{ //次常用汉字，倚天中文系统扩充,ok
++non_common_big5_char_num;
}
}
else
{
if (0x8140 <= big5_char_value && big5_char_value <= 0xA0FE)
{ //造字区
++non_common_big5_char_num;
}
else if (0xF9FE < big5_char_value && big5_char_value <= 0xFEFE)
{ //造字区
++non_common_big5_char_num;
}
else --p, ++invalid_num;
}
}
}
if (p_non_common_big5_num != NULL) *p_non_common_big5_num = non_common_big5_char_num;
if (p_invalid_num != NULL) *p_invalid_num = invalid_num;
return common_big5_char_num;
}
/**
@return 1 if str match big5, and common character proportion exceeds 80%
*/
int32_t predict_str_big5(const char* str, uint32_t str_len)
{
uint32_t non_common_num, invalid_num;
uint32_t common_num = get_str_big5_char_number(str, str_len, &non_common_num, &invalid_num);
return invalid_num == 0 && common_num > 4 * non_common_num;
}
uint32_t big5_next_char(const char* in, const char** endptr)
{
const uint8_t* p = (const uint8_t*)in;
if (*p & 0x80){
uint16_t big5_char_value = *p << 8;
big5_char_value |= *++p;
if (0xA140 <= big5_char_value && big5_char_value <= 0xF9FE)
{
if (big5_char_value <= 0xA3E1)
{ //标点符号,ok
}
else if (big5_char_value<0xA440) big5_char_value = 0;
else if (big5_char_value <= 0xC67E)
{ //常用汉字,ok
}
else if (big5_char_value<0xC6A1) big5_char_value = 0;
else if (big5_char_value <= 0xC875)
{ //倚天中文系统扩充,ok
}
else if (big5_char_value<0xC940) big5_char_value = 0;
else
{ //次常用汉字，倚天中文系统扩充,ok
}
}
else
{
if (0x8140 <= big5_char_value && big5_char_value <= 0xA0FE)
{ //造字区
}
else if (0xF9FE < big5_char_value && big5_char_value <= 0xFEFE)
{ //造字区
}
else big5_char_value = 0;
}
if (endptr) *endptr = in + (big5_char_value != 0 ? 2 : 1);
return big5_char_value;
}
else
{
if (endptr) *endptr = in + 1;
return *p;
}
}
uint32_t big5_fill_question_mark(char** in)
{
*(*in)++ = 0xa1;
*(*in)++ = 0x48;
return 2;
}
typedef uint32_t (*next_char_t)(const char* in, const char** endptr);
typedef uint32_t(*fill_default_char_t)(char** in);
typedef struct s_ecv_ctx_t
{
const char* encoding_name_from;
const char* encoding_name_to;
next_char_t next_char; //获取输入流中的下一个字符，输入指针指向后面的字符，返回读取的字符编码
fill_default_char_t fill_default_char; //当输入流中存在非法字符时，使用本函数向输出流填充一个默认字符，返回写入的字节数
}ecv_ctx_t;
static ecv_ctx_t gbk_to_utf8_ctx = { "GBK", "UTF-8", gbk_next_char, utf8_fill_question_mark };
static ecv_ctx_t big5_to_utf8_ctx = { "BIG5", "UTF-8", big5_next_char, utf8_fill_question_mark };
static ecv_ctx_t big5_to_gbk_ctx = { "BIG5", "GBK", big5_next_char, gbk_fill_question_mark };
static ecv_ctx_t utf8_to_gbk_ctx = { "UTF-8", "GBK", utf8_next_char, gbk_fill_question_mark };
static ecv_ctx_t gbk_to_big5_ctx = { "GBK", "BIG5", gbk_next_char, big5_fill_question_mark };
static ecv_ctx_t utf8_to_big5_ctx = { "UTF-8","BIG5", utf8_next_char, big5_fill_question_mark };
static void encoding_cvt_reset(iconv_t cd);
static int32_t encoding_cvt_conv(iconv_t cd, ecv_ctx_t* ctx, const char* in, uint32_t in_len, char* out, uint32_t* out_len);
int32_t encoding_cvt_initialize(EncodingCvt* self)
{
self->gbk_to_utf8 = NULL;
self->big5_to_utf8 = NULL;
self->big5_to_gbk = NULL;
self->utf8_to_gbk = NULL;
self->gbk_to_big5 = NULL;
self->utf8_to_big5 = NULL;
return 0;
}
int32_t encoding_cvt_finalize(EncodingCvt* self)
{
if(self->gbk_to_utf8 != NULL)
{
iconv_close(self->gbk_to_utf8);
self->gbk_to_utf8 = NULL;
}
if(self->big5_to_utf8 != NULL)
{
iconv_close(self->big5_to_utf8);
self->big5_to_utf8 = NULL;
}
if(self->big5_to_gbk != NULL)
{
iconv_close(self->big5_to_gbk);
self->big5_to_gbk = NULL;
}
if(self->utf8_to_gbk != NULL)
{
iconv_close(self->utf8_to_gbk);
self->utf8_to_gbk = NULL;
}
if(self->gbk_to_big5 != NULL)
{
iconv_close(self->gbk_to_big5);
self->gbk_to_big5 = NULL;
}
if(self->utf8_to_big5 != NULL)
{
iconv_close(self->utf8_to_big5);
self->utf8_to_big5 = NULL;
}
return 0;
}
int32_t encoding_cvt_gbk_to_utf8(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
if(self->gbk_to_utf8 == NULL)
{
self->gbk_to_utf8 = iconv_open("UTF-8//TRANSLIT", "GBK");
if(self->gbk_to_utf8==(iconv_t)-1)
{
self->gbk_to_utf8 = NULL;
return errno;
}
}
return encoding_cvt_conv(self->gbk_to_utf8, &gbk_to_utf8_ctx, in, in_len, out, out_len);
}
int32_t encoding_cvt_big5_to_utf8(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
if(self->big5_to_utf8 == NULL)
{
self->big5_to_utf8 = iconv_open("UTF-8//TRANSLIT", "BIG5");
if(self->big5_to_utf8==(iconv_t)-1)
{
self->big5_to_utf8 = NULL;
return errno;
}
}
return encoding_cvt_conv(self->big5_to_utf8, &big5_to_utf8_ctx, in, in_len, out, out_len);
}
int32_t encoding_cvt_utf8_to_gbk(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
if(self->utf8_to_gbk == NULL)
{
self->utf8_to_gbk = iconv_open("GBK//TRANSLIT", "UTF-8");
if(self->utf8_to_gbk==(iconv_t)-1)
{
self->utf8_to_gbk = NULL;
return errno;
}
}
return encoding_cvt_conv(self->utf8_to_gbk, &utf8_to_gbk_ctx, in, in_len, out, out_len);
}
int32_t encoding_cvt_big5_to_gbk(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
if(self->big5_to_gbk == NULL)
{
self->big5_to_gbk = iconv_open("GBK//TRANSLIT", "BIG5");
if(self->big5_to_gbk==(iconv_t)-1)
{
self->big5_to_gbk = NULL;
return errno;
}
}
return encoding_cvt_conv(self->big5_to_gbk, &big5_to_gbk_ctx, in, in_len, out, out_len);
}
int32_t encoding_cvt_gbk_to_big5(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
if(self->gbk_to_big5 == NULL)
{
self->gbk_to_big5 = iconv_open("BIG5//TRANSLIT", "GBK");
if(self->gbk_to_big5==(iconv_t)-1)
{
self->gbk_to_big5 = NULL;
return errno;
}
}
return encoding_cvt_conv(self->gbk_to_big5, &gbk_to_big5_ctx, in, in_len, out, out_len);
}
int32_t encoding_cvt_utf8_to_big5(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
if(self->utf8_to_big5 == NULL)
{
self->utf8_to_big5 = iconv_open("BIG5//TRANSLIT", "UTF-8");
if(self->gbk_to_big5==(iconv_t)-1)
{
self->gbk_to_big5 = NULL;
return errno;
}
}
return encoding_cvt_conv(self->utf8_to_big5, &utf8_to_big5_ctx, in, in_len, out, out_len);
}
static void encoding_cvt_reset(iconv_t cd)
{
iconv(cd, NULL, NULL, NULL, NULL);
}
int32_t fix_encoding(next_char_t next_char, fill_default_char_t fill_default_char, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
if(*out_len >= in_len)
{
const char* cur_end;
char* p_out = out;
const char* p = in;
const char* end = p + in_len;
const char* cur = p;
for(;;)
{
while(next_char(cur, &cur_end) != 0)
{
if(cur_end < end) cur = cur_end;
else if(cur_end == end)
{
memcpy(p_out, p, cur_end - p);
p_out += cur_end - p;
goto L_END;
}
else //if(cur_end > end)
{
memcpy(p_out, p, cur - p);
p_out += cur - p;
fill_default_char(&p_out);
goto L_END;
}
}
memcpy(p_out, p, cur - p);
p_out += cur - p;
fill_default_char(&p_out);
p = cur = cur_end;
}
L_END:
*out_len = p_out - out;
return 0;
}
else return E2BIG;
}
/**
* @return 0, success, and write target encoding into in
-1, cannot recognize the encoding of in
errno, cannot convert in to target encoding
errno may be EILSEQ, EINVAL, E2BIG
*/
int32_t encoding_cvt_to_utf8(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
uint32_t non_common_utf8_num;
uint32_t common_utf8_num;
uint32_t invalid_utf8_num;
uint32_t common_gbk_num;
uint32_t non_common_gbk_num;
uint32_t invalid_gbk_num;
uint32_t common_big5_num;
uint32_t non_common_big5_num;
uint32_t invalid_big5_num;
/* 查找常用字比例超过80%的编码 */
common_gbk_num = get_str_gbk_char_number(in, in_len, &non_common_gbk_num, &invalid_gbk_num);
if (invalid_gbk_num == 0 && common_gbk_num > 4 * non_common_gbk_num)
{ //gbk
return encoding_cvt_gbk_to_utf8(self, in, in_len, out, out_len);
}
common_utf8_num = get_str_utf8_char_number(in, in_len, &non_common_utf8_num, &invalid_utf8_num);
if (invalid_utf8_num == 0 && common_utf8_num > 4 * non_common_utf8_num)
{ //utf8
return encoding_cvt_copy_input(in, in_len, out, out_len);
}
common_big5_num = get_str_big5_char_number(in, in_len, &non_common_big5_num, &invalid_big5_num);
if (invalid_big5_num == 0 && common_big5_num > 4 * non_common_big5_num)
{ //big5
return encoding_cvt_big5_to_utf8(self, in, in_len, out, out_len);
}
if (common_gbk_num == 0 && common_utf8_num == 0 && common_big5_num == 0) return -1;
/* 获取发现有效字符数最多的编码 */
if (common_gbk_num >= common_big5_num)
{ //gbk or utf8
if (common_gbk_num >= common_utf8_num)
{ //gbk
return encoding_cvt_gbk_to_utf8(self, in, in_len, out, out_len);
}
else
{ //utf8
if(invalid_utf8_num == 0) return encoding_cvt_copy_input(in, in_len, out, out_len);
else return fix_encoding(utf8_next_char, utf8_fill_question_mark, in, in_len, out, out_len);
}
}
else
{ // big5 or utf8
if (common_utf8_num >= common_big5_num)
{ //utf8
if(invalid_utf8_num == 0) return encoding_cvt_copy_input(in, in_len, out, out_len);
else return fix_encoding(utf8_next_char, utf8_fill_question_mark, in, in_len, out, out_len);
}
else
{ //big5
return encoding_cvt_big5_to_utf8(self, in, in_len, out, out_len);
}
}
}
int32_t encoding_cvt_to_gbk(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
uint32_t non_common_utf8_num;
uint32_t common_utf8_num;
uint32_t invalid_utf8_num;
uint32_t common_gbk_num;
uint32_t non_common_gbk_num;
uint32_t invalid_gbk_num;
uint32_t common_big5_num;
uint32_t non_common_big5_num;
uint32_t invalid_big5_num;
/* 查找常用字比例超过80%的编码 */
common_gbk_num = get_str_gbk_char_number(in, in_len, &non_common_gbk_num, &invalid_gbk_num);
if (invalid_gbk_num == 0 && common_gbk_num > 4 * non_common_gbk_num)
{ //gbk
return encoding_cvt_copy_input(in, in_len, out, out_len);
}
common_utf8_num = get_str_utf8_char_number(in, in_len, &non_common_utf8_num, &invalid_utf8_num);
if (invalid_utf8_num == 0 && common_utf8_num > 4 * non_common_utf8_num)
{ //utf8
return encoding_cvt_utf8_to_gbk(self, in, in_len, out, out_len);
}
common_big5_num = get_str_big5_char_number(in, in_len, &non_common_big5_num, &invalid_big5_num);
if (invalid_big5_num == 0 && common_big5_num > 4 * non_common_big5_num)
{ //big5
return encoding_cvt_big5_to_gbk(self, in, in_len, out, out_len);
}
if (common_gbk_num == 0 && common_utf8_num == 0 && common_big5_num == 0) return -1;
/* 获取发现有效字符数最多的编码 */
if (common_gbk_num >= common_big5_num)
{ //gbk or utf8
if (common_gbk_num >= common_utf8_num)
{ //gbk
if(invalid_gbk_num == 0) return encoding_cvt_copy_input(in, in_len, out, out_len);
else return fix_encoding(gbk_next_char, gbk_fill_question_mark, in, in_len, out, out_len);
}
else
{ //utf8
return encoding_cvt_utf8_to_gbk(self, in, in_len, out, out_len);
}
}
else
{ // big5 or utf8
if (common_utf8_num >= common_big5_num)
{ //utf8
return encoding_cvt_utf8_to_gbk(self, in, in_len, out, out_len);
}
else
{ //big5
return encoding_cvt_big5_to_gbk(self, in, in_len, out, out_len);
}
}
}
int32_t encoding_cvt_to_big5(EncodingCvt* self, const char* in, uint32_t in_len, char* out, uint32_t* out_len)
{
uint32_t non_common_utf8_num;
uint32_t common_utf8_num;
uint32_t invalid_utf8_num;
uint32_t common_gbk_num;
uint32_t non_common_gbk_num;
uint32_t invalid_gbk_num;
uint32_t common_big5_num;
uint32_t non_common_big5_num;
uint32_t invalid_big5_num;
/* 查找常用字比例超过80%的编码 */
common_gbk_num = get_str_gbk_char_number(in, in_len, &non_common_gbk_num, &invalid_gbk_num);
if (invalid_gbk_num == 0 && common_gbk_num > 4 * non_common_gbk_num)
{ //gbk
return encoding_cvt_gbk_to_big5(self, in, in_len, out, out_len);
}
common_utf8_num = get_str_utf8_char_number(in, in_len, &non_common_utf8_num, &invalid_utf8_num);
if (invalid_utf8_num == 0 && common_utf8_num > 4 * non_common_utf8_num)
{ //utf8
return encoding_cvt_utf8_to_big5(self, in, in_len, out, out_len);
}
common_big5_num = get_str_big5_char_number(in, in_len, &non_common_big5_num, &invalid_big5_num);
if (invalid_big5_num == 0 && common_big5_num > 4 * non_common_big5_num)
{ //big5
return encoding_cvt_copy_input(in, in_len, out, out_len);
}
if (common_gbk_num == 0 && common_utf8_num == 0 && common_big5_num == 0) return -1;