greenplumn euc_cn_and_mic 源码
greenplumn euc_cn_and_mic 代码
文件路径:/src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c
/*-------------------------------------------------------------------------
*
* EUC_CN and MULE_INTERNAL
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/utils/mb/conversion_procs/euc_cn_and_mic/euc_cn_and_mic.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(euc_cn_to_mic);
PG_FUNCTION_INFO_V1(mic_to_euc_cn);
/* ----------
* 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
* ) returns VOID;
* ----------
*/
static void euc_cn2mic(const unsigned char *euc, unsigned char *p, int len);
static void mic2euc_cn(const unsigned char *mic, unsigned char *p, int len);
Datum
euc_cn_to_mic(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);
CHECK_ENCODING_CONVERSION_ARGS(PG_EUC_CN, PG_MULE_INTERNAL);
euc_cn2mic(src, dest, len);
PG_RETURN_VOID();
}
Datum
mic_to_euc_cn(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);
CHECK_ENCODING_CONVERSION_ARGS(PG_MULE_INTERNAL, PG_EUC_CN);
mic2euc_cn(src, dest, len);
PG_RETURN_VOID();
}
/*
* EUC_CN ---> MIC
*/
static void
euc_cn2mic(const unsigned char *euc, unsigned char *p, int len)
{
int c1;
while (len > 0)
{
c1 = *euc;
if (IS_HIGHBIT_SET(c1))
{
if (len < 2 || !IS_HIGHBIT_SET(euc[1]))
report_invalid_encoding(PG_EUC_CN, (const char *) euc, len);
*p++ = LC_GB2312_80;
*p++ = c1;
*p++ = euc[1];
euc += 2;
len -= 2;
}
else
{ /* should be ASCII */
if (c1 == 0)
report_invalid_encoding(PG_EUC_CN, (const char *) euc, len);
*p++ = c1;
euc++;
len--;
}
}
*p = '\0';
}
/*
* MIC ---> EUC_CN
*/
static void
mic2euc_cn(const unsigned char *mic, unsigned char *p, int len)
{
int c1;
while (len > 0)
{
c1 = *mic;
if (IS_HIGHBIT_SET(c1))
{
if (c1 != LC_GB2312_80)
report_untranslatable_char(PG_MULE_INTERNAL, PG_EUC_CN,
(const char *) mic, len);
if (len < 3 || !IS_HIGHBIT_SET(mic[1]) || !IS_HIGHBIT_SET(mic[2]))
report_invalid_encoding(PG_MULE_INTERNAL,
(const char *) mic, len);
mic++;
*p++ = *mic++;
*p++ = *mic++;
len -= 3;
}
else
{ /* should be ASCII */
if (c1 == 0)
report_invalid_encoding(PG_MULE_INTERNAL,
(const char *) mic, len);
*p++ = c1;
mic++;
len--;
}
}
*p = '\0';
}
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