greenplumn big5 源码
greenplumn big5 代码
文件路径:/src/backend/utils/mb/conversion_procs/euc_tw_and_big5/big5.c
/*
* conversion between BIG5 and Mule Internal Code(CNS 116643-1992
* plane 1 and plane 2).
* This program is partially copied from lv(Multilingual file viewer)
* and slightly modified. lv is written and copyrighted by NARITA Tomio
* (nrt@web.ad.jp).
*
* 1999/1/15 Tatsuo Ishii
*
* src/backend/utils/mb/conversion_procs/euc_tw_and_big5/big5.c
*/
/* can be used in either frontend or backend */
#include "postgres_fe.h"
#include "mb/pg_wchar.h"
typedef struct
{
unsigned short code,
peer;
} codes_t;
/* map Big5 Level 1 to CNS 11643-1992 Plane 1 */
static const codes_t big5Level1ToCnsPlane1[25] = { /* range */
{0xA140, 0x2121},
{0xA1F6, 0x2258},
{0xA1F7, 0x2257},
{0xA1F8, 0x2259},
{0xA2AF, 0x2421},
{0xA3C0, 0x4221},
{0xa3e1, 0x0000},
{0xA440, 0x4421},
{0xACFE, 0x5753},
{0xacff, 0x0000},
{0xAD40, 0x5323},
{0xAFD0, 0x5754},
{0xBBC8, 0x6B51},
{0xBE52, 0x6B50},
{0xBE53, 0x6F5C},
{0xC1AB, 0x7536},
{0xC2CB, 0x7535},
{0xC2CC, 0x7737},
{0xC361, 0x782E},
{0xC3B9, 0x7865},
{0xC3BA, 0x7864},
{0xC3BB, 0x7866},
{0xC456, 0x782D},
{0xC457, 0x7962},
{0xc67f, 0x0000}
};
/* map CNS 11643-1992 Plane 1 to Big5 Level 1 */
static const codes_t cnsPlane1ToBig5Level1[26] = { /* range */
{0x2121, 0xA140},
{0x2257, 0xA1F7},
{0x2258, 0xA1F6},
{0x2259, 0xA1F8},
{0x234f, 0x0000},
{0x2421, 0xA2AF},
{0x2571, 0x0000},
{0x4221, 0xA3C0},
{0x4242, 0x0000},
{0x4421, 0xA440},
{0x5323, 0xAD40},
{0x5753, 0xACFE},
{0x5754, 0xAFD0},
{0x6B50, 0xBE52},
{0x6B51, 0xBBC8},
{0x6F5C, 0xBE53},
{0x7535, 0xC2CB},
{0x7536, 0xC1AB},
{0x7737, 0xC2CC},
{0x782D, 0xC456},
{0x782E, 0xC361},
{0x7864, 0xC3BA},
{0x7865, 0xC3B9},
{0x7866, 0xC3BB},
{0x7962, 0xC457},
{0x7d4c, 0x0000}
};
/* map Big5 Level 2 to CNS 11643-1992 Plane 2 */
static const codes_t big5Level2ToCnsPlane2[48] = { /* range */
{0xC940, 0x2121},
{0xc94a, 0x0000},
{0xC94B, 0x212B},
{0xC96C, 0x214D},
{0xC9BE, 0x214C},
{0xC9BF, 0x217D},
{0xC9ED, 0x224E},
{0xCAF7, 0x224D},
{0xCAF8, 0x2439},
{0xD77A, 0x3F6A},
{0xD77B, 0x387E},
{0xDBA7, 0x3F6B},
{0xDDFC, 0x4176},
{0xDDFD, 0x4424},
{0xE8A3, 0x554C},
{0xE976, 0x5723},
{0xEB5B, 0x5A29},
{0xEBF1, 0x554B},
{0xEBF2, 0x5B3F},
{0xECDE, 0x5722},
{0xECDF, 0x5C6A},
{0xEDAA, 0x5D75},
{0xEEEB, 0x642F},
{0xEEEC, 0x6039},
{0xF056, 0x5D74},
{0xF057, 0x6243},
{0xF0CB, 0x5A28},
{0xF0CC, 0x6337},
{0xF163, 0x6430},
{0xF16B, 0x6761},
{0xF16C, 0x6438},
{0xF268, 0x6934},
{0xF269, 0x6573},
{0xF2C3, 0x664E},
{0xF375, 0x6762},
{0xF466, 0x6935},
{0xF4B5, 0x664D},
{0xF4B6, 0x6962},
{0xF4FD, 0x6A4C},
{0xF663, 0x6A4B},
{0xF664, 0x6C52},
{0xF977, 0x7167},
{0xF9C4, 0x7166},
{0xF9C5, 0x7234},
{0xF9C6, 0x7240},
{0xF9C7, 0x7235},
{0xF9D2, 0x7241},
{0xf9d6, 0x0000}
};
/* map CNS 11643-1992 Plane 2 to Big5 Level 2 */
static const codes_t cnsPlane2ToBig5Level2[49] = { /* range */
{0x2121, 0xC940},
{0x212B, 0xC94B},
{0x214C, 0xC9BE},
{0x214D, 0xC96C},
{0x217D, 0xC9BF},
{0x224D, 0xCAF7},
{0x224E, 0xC9ED},
{0x2439, 0xCAF8},
{0x387E, 0xD77B},
{0x3F6A, 0xD77A},
{0x3F6B, 0xDBA7},
{0x4424, 0x0000},
{0x4176, 0xDDFC},
{0x4177, 0x0000},
{0x4424, 0xDDFD},
{0x554B, 0xEBF1},
{0x554C, 0xE8A3},
{0x5722, 0xECDE},
{0x5723, 0xE976},
{0x5A28, 0xF0CB},
{0x5A29, 0xEB5B},
{0x5B3F, 0xEBF2},
{0x5C6A, 0xECDF},
{0x5D74, 0xF056},
{0x5D75, 0xEDAA},
{0x6039, 0xEEEC},
{0x6243, 0xF057},
{0x6337, 0xF0CC},
{0x642F, 0xEEEB},
{0x6430, 0xF163},
{0x6438, 0xF16C},
{0x6573, 0xF269},
{0x664D, 0xF4B5},
{0x664E, 0xF2C3},
{0x6761, 0xF16B},
{0x6762, 0xF375},
{0x6934, 0xF268},
{0x6935, 0xF466},
{0x6962, 0xF4B6},
{0x6A4B, 0xF663},
{0x6A4C, 0xF4FD},
{0x6C52, 0xF664},
{0x7166, 0xF9C4},
{0x7167, 0xF977},
{0x7234, 0xF9C5},
{0x7235, 0xF9C7},
{0x7240, 0xF9C6},
{0x7241, 0xF9D2},
{0x7245, 0x0000}
};
/* Big Five Level 1 Correspondence to CNS 11643-1992 Plane 4 */
static const unsigned short b1c4[][2] = {
{0xC879, 0x2123},
{0xC87B, 0x2124},
{0xC87D, 0x212A},
{0xC8A2, 0x2152}
};
/* Big Five Level 2 Correspondence to CNS 11643-1992 Plane 3 */
static const unsigned short b2c3[][2] = {
{0xF9D6, 0x4337},
{0xF9D7, 0x4F50},
{0xF9D8, 0x444E},
{0xF9D9, 0x504A},
{0xF9DA, 0x2C5D},
{0xF9DB, 0x3D7E},
{0xF9DC, 0x4B5C}
};
static unsigned short BinarySearchRange
(const codes_t *array, int high, unsigned short code)
{
int low,
mid,
distance,
tmp;
low = 0;
mid = high >> 1;
for (; low <= high; mid = (low + high) >> 1)
{
if ((array[mid].code <= code) && (array[mid + 1].code > code))
{
if (0 == array[mid].peer)
return 0;
if (code >= 0xa140U)
{
/* big5 to cns */
tmp = ((code & 0xff00) - (array[mid].code & 0xff00)) >> 8;
high = code & 0x00ff;
low = array[mid].code & 0x00ff;
/*
* NOTE: big5 high_byte: 0xa1-0xfe, low_byte: 0x40-0x7e,
* 0xa1-0xfe (radicals: 0x00-0x3e, 0x3f-0x9c) big5 radix is
* 0x9d. [region_low, region_high] We
* should remember big5 has two different regions (above).
* There is a bias for the distance between these regions.
* 0xa1 - 0x7e + bias = 1 (Distance between 0xa1 and 0x7e is
* 1.) bias = - 0x22.
*/
distance = tmp * 0x9d + high - low +
(high >= 0xa1 ? (low >= 0xa1 ? 0 : -0x22)
: (low >= 0xa1 ? +0x22 : 0));
/*
* NOTE: we have to convert the distance into a code point.
* The code point's low_byte is 0x21 plus mod_0x5e. In the
* first, we extract the mod_0x5e of the starting code point,
* subtracting 0x21, and add distance to it. Then we calculate
* again mod_0x5e of them, and restore the final codepoint,
* adding 0x21.
*/
tmp = (array[mid].peer & 0x00ff) + distance - 0x21;
tmp = (array[mid].peer & 0xff00) + ((tmp / 0x5e) << 8)
+ 0x21 + tmp % 0x5e;
return tmp;
}
else
{
/* cns to big5 */
tmp = ((code & 0xff00) - (array[mid].code & 0xff00)) >> 8;
/*
* NOTE: ISO charsets ranges between 0x21-0xfe (94charset).
* Its radix is 0x5e. But there is no distance bias like big5.
*/
distance = tmp * 0x5e
+ ((int) (code & 0x00ff) - (int) (array[mid].code & 0x00ff));
/*
* NOTE: Similar to big5 to cns conversion, we extract
* mod_0x9d and restore mod_0x9d into a code point.
*/
low = array[mid].peer & 0x00ff;
tmp = low + distance - (low >= 0xa1 ? 0x62 : 0x40);
low = tmp % 0x9d;
tmp = (array[mid].peer & 0xff00) + ((tmp / 0x9d) << 8)
+ (low > 0x3e ? 0x62 : 0x40) + low;
return tmp;
}
}
else if (array[mid].code > code)
high = mid - 1;
else
low = mid + 1;
}
return 0;
}
unsigned short
BIG5toCNS(unsigned short big5, unsigned char *lc)
{
unsigned short cns = 0;
int i;
if (big5 < 0xc940U)
{
/* level 1 */
for (i = 0; i < sizeof(b1c4) / (sizeof(unsigned short) * 2); i++)
{
if (b1c4[i][0] == big5)
{
*lc = LC_CNS11643_4;
return (b1c4[i][1] | 0x8080U);
}
}
if (0 < (cns = BinarySearchRange(big5Level1ToCnsPlane1, 23, big5)))
*lc = LC_CNS11643_1;
}
else if (big5 == 0xc94aU)
{
/* level 2 */
*lc = LC_CNS11643_1;
cns = 0x4442;
}
else
{
/* level 2 */
for (i = 0; i < sizeof(b2c3) / (sizeof(unsigned short) * 2); i++)
{
if (b2c3[i][0] == big5)
{
*lc = LC_CNS11643_3;
return (b2c3[i][1] | 0x8080U);
}
}
if (0 < (cns = BinarySearchRange(big5Level2ToCnsPlane2, 46, big5)))
*lc = LC_CNS11643_2;
}
if (0 == cns)
{ /* no mapping Big5 to CNS 11643-1992 */
*lc = 0;
return (unsigned short) '?';
}
return cns | 0x8080;
}
unsigned short
CNStoBIG5(unsigned short cns, unsigned char lc)
{
int i;
unsigned int big5 = 0;
cns &= 0x7f7f;
switch (lc)
{
case LC_CNS11643_1:
big5 = BinarySearchRange(cnsPlane1ToBig5Level1, 24, cns);
break;
case LC_CNS11643_2:
big5 = BinarySearchRange(cnsPlane2ToBig5Level2, 47, cns);
break;
case LC_CNS11643_3:
for (i = 0; i < sizeof(b2c3) / (sizeof(unsigned short) * 2); i++)
{
if (b2c3[i][1] == cns)
return b2c3[i][0];
}
break;
case LC_CNS11643_4:
for (i = 0; i < sizeof(b1c4) / (sizeof(unsigned short) * 2); i++)
{
if (b1c4[i][1] == cns)
return b1c4[i][0];
}
default:
break;
}
return big5;
}
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