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/*-------------------------------------------------------------------------
*
* GB18030 <--> UTF8
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/utils/mb/conversion_procs/utf8_and_gb18030/utf8_and_gb18030.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
#include "../../Unicode/gb18030_to_utf8.map"
#include "../../Unicode/utf8_to_gb18030.map"
PG_MODULE_MAGIC_EXT(
.name = "utf8_and_gb18030",
.version = PG_VERSION
);
PG_FUNCTION_INFO_V1(gb18030_to_utf8);
PG_FUNCTION_INFO_V1(utf8_to_gb18030);
/*
* Convert 4-byte GB18030 characters to and from a linear code space
*
* The first and third bytes can range from 0x81 to 0xfe (126 values),
* while the second and fourth bytes can range from 0x30 to 0x39 (10 values).
*/
static inline uint32
gb_linear(uint32 gb)
{
uint32 b0 = (gb & 0xff000000) >> 24;
uint32 b1 = (gb & 0x00ff0000) >> 16;
uint32 b2 = (gb & 0x0000ff00) >> 8;
uint32 b3 = (gb & 0x000000ff);
return b0 * 12600 + b1 * 1260 + b2 * 10 + b3 -
(0x81 * 12600 + 0x30 * 1260 + 0x81 * 10 + 0x30);
}
static inline uint32
gb_unlinear(uint32 lin)
{
uint32 r0 = 0x81 + lin / 12600;
uint32 r1 = 0x30 + (lin / 1260) % 10;
uint32 r2 = 0x81 + (lin / 10) % 126;
uint32 r3 = 0x30 + lin % 10;
return (r0 << 24) | (r1 << 16) | (r2 << 8) | r3;
}
/*
* Convert word-formatted UTF8 to and from Unicode code points
*
* Probably this should be somewhere else ...
*/
static inline uint32
unicode_to_utf8word(uint32 c)
{
uint32 word;
if (c <= 0x7F)
{
word = c;
}
else if (c <= 0x7FF)
{
word = (0xC0 | ((c >> 6) & 0x1F)) << 8;
word |= 0x80 | (c & 0x3F);
}
else if (c <= 0xFFFF)
{
word = (0xE0 | ((c >> 12) & 0x0F)) << 16;
word |= (0x80 | ((c >> 6) & 0x3F)) << 8;
word |= 0x80 | (c & 0x3F);
}
else
{
word = (0xF0 | ((c >> 18) & 0x07)) << 24;
word |= (0x80 | ((c >> 12) & 0x3F)) << 16;
word |= (0x80 | ((c >> 6) & 0x3F)) << 8;
word |= 0x80 | (c & 0x3F);
}
return word;
}
static inline uint32
utf8word_to_unicode(uint32 c)
{
uint32 ucs;
if (c <= 0x7F)
{
ucs = c;
}
else if (c <= 0xFFFF)
{
ucs = ((c >> 8) & 0x1F) << 6;
ucs |= c & 0x3F;
}
else if (c <= 0xFFFFFF)
{
ucs = ((c >> 16) & 0x0F) << 12;
ucs |= ((c >> 8) & 0x3F) << 6;
ucs |= c & 0x3F;
}
else
{
ucs = ((c >> 24) & 0x07) << 18;
ucs |= ((c >> 16) & 0x3F) << 12;
ucs |= ((c >> 8) & 0x3F) << 6;
ucs |= c & 0x3F;
}
return ucs;
}
/*
* Perform mapping of GB18030 ranges to UTF8
*
* The ranges we need to convert are specified in gb-18030-2000.xml.
* All are ranges of 4-byte GB18030 codes.
*/
static uint32
conv_18030_to_utf8(uint32 code)
{
#define conv18030(minunicode, mincode, maxcode) \
if (code >= mincode && code <= maxcode) \
return unicode_to_utf8word(gb_linear(code) - gb_linear(mincode) + minunicode)
conv18030(0x0452, 0x8130D330, 0x8136A531);
conv18030(0x2643, 0x8137A839, 0x8138FD38);
conv18030(0x361B, 0x8230A633, 0x8230F237);
conv18030(0x3CE1, 0x8231D438, 0x8232AF32);
conv18030(0x4160, 0x8232C937, 0x8232F837);
conv18030(0x44D7, 0x8233A339, 0x8233C931);
conv18030(0x478E, 0x8233E838, 0x82349638);
conv18030(0x49B8, 0x8234A131, 0x8234E733);
conv18030(0x9FA6, 0x82358F33, 0x8336C738);
conv18030(0xE865, 0x8336D030, 0x84308534);
conv18030(0xFA2A, 0x84309C38, 0x84318537);
conv18030(0xFFE6, 0x8431A234, 0x8431A439);
conv18030(0x10000, 0x90308130, 0xE3329A35);
/* No mapping exists */
return 0;
}
/*
* Perform mapping of UTF8 ranges to GB18030
*/
static uint32
conv_utf8_to_18030(uint32 code)
{
uint32 ucs = utf8word_to_unicode(code);
#define convutf8(minunicode, maxunicode, mincode) \
if (ucs >= minunicode && ucs <= maxunicode) \
return gb_unlinear(ucs - minunicode + gb_linear(mincode))
convutf8(0x0452, 0x200F, 0x8130D330);
convutf8(0x2643, 0x2E80, 0x8137A839);
convutf8(0x361B, 0x3917, 0x8230A633);
convutf8(0x3CE1, 0x4055, 0x8231D438);
convutf8(0x4160, 0x4336, 0x8232C937);
convutf8(0x44D7, 0x464B, 0x8233A339);
convutf8(0x478E, 0x4946, 0x8233E838);
convutf8(0x49B8, 0x4C76, 0x8234A131);
convutf8(0x9FA6, 0xD7FF, 0x82358F33);
convutf8(0xE865, 0xF92B, 0x8336D030);
convutf8(0xFA2A, 0xFE2F, 0x84309C38);
convutf8(0xFFE6, 0xFFFF, 0x8431A234);
convutf8(0x10000, 0x10FFFF, 0x90308130);
/* No mapping exists */
return 0;
}
/* ----------
* conv_proc(
* INTEGER, -- source encoding id
* INTEGER, -- destination encoding id
* CSTRING, -- source string (null terminated C string)
* CSTRING, -- destination string (null terminated C string)
* INTEGER, -- source string length
* BOOL -- if true, don't throw an error if conversion fails
* ) returns INTEGER;
*
* Returns the number of bytes successfully converted.
* ----------
*/
Datum
gb18030_to_utf8(PG_FUNCTION_ARGS)
{
unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
int len = PG_GETARG_INT32(4);
bool noError = PG_GETARG_BOOL(5);
int converted;
CHECK_ENCODING_CONVERSION_ARGS(PG_GB18030, PG_UTF8);
converted = LocalToUtf(src, len, dest,
&gb18030_to_unicode_tree,
NULL, 0,
conv_18030_to_utf8,
PG_GB18030,
noError);
PG_RETURN_INT32(converted);
}
Datum
utf8_to_gb18030(PG_FUNCTION_ARGS)
{
unsigned char *src = (unsigned char *) PG_GETARG_CSTRING(2);
unsigned char *dest = (unsigned char *) PG_GETARG_CSTRING(3);
int len = PG_GETARG_INT32(4);
bool noError = PG_GETARG_BOOL(5);
int converted;
CHECK_ENCODING_CONVERSION_ARGS(PG_UTF8, PG_GB18030);
converted = UtfToLocal(src, len, dest,
&gb18030_from_unicode_tree,
NULL, 0,
conv_utf8_to_18030,
PG_GB18030,
noError);
PG_RETURN_INT32(converted);
}
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