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Clean up encode/decode functions a little bit.

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This commit is contained in:
Tom Lane 2001-09-30 22:03:41 +00:00
parent 12054ba506
commit 7eff804b49
1 changed files with 22 additions and 26 deletions
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48
src/backend/utils/adt/encode.c
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@ -7,13 +7,14 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/encode.c,v 1.2 2001/09/14 17:46:40 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/encode.c,v 1.3 2001/09/30 22:03:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include "utils/builtins.h"
@ -38,24 +39,25 @@ binary_encode(PG_FUNCTION_ARGS)
Datum name = PG_GETARG_DATUM(1);
text *result;
char *namebuf;
int namelen, datalen, resultlen, res;
int datalen, resultlen, res;
struct pg_encoding *enc;
datalen = VARSIZE(data) - VARHDRSZ;
namelen = VARSIZE(name) - VARHDRSZ;
namebuf = (char *)DirectFunctionCall1(textout, name);
namebuf = DatumGetCString(DirectFunctionCall1(textout, name));
enc = pg_find_encoding(namebuf);
if (enc == NULL)
elog(ERROR, "No such encoding");
elog(ERROR, "No such encoding as '%s'", namebuf);
resultlen = enc->encode_len(VARDATA(data), datalen);
result = palloc(VARHDRSZ + resultlen);
res = enc->encode(VARDATA(data), datalen, VARDATA(result));
/* Make this FATAL 'cause we've trodden on memory ... */
if (res > resultlen)
elog(ERROR, "Overflow - encode estimate too small");
elog(FATAL, "Overflow - encode estimate too small");
VARATT_SIZEP(result) = VARHDRSZ + res;
@ -69,24 +71,25 @@ binary_decode(PG_FUNCTION_ARGS)
Datum name = PG_GETARG_DATUM(1);
bytea *result;
char *namebuf;
int namelen, datalen, resultlen, res;
int datalen, resultlen, res;
struct pg_encoding *enc;
datalen = VARSIZE(data) - VARHDRSZ;
namelen = VARSIZE(name) - VARHDRSZ;
namebuf = (char *)DirectFunctionCall1(textout, name);
namebuf = DatumGetCString(DirectFunctionCall1(textout, name));
enc = pg_find_encoding(namebuf);
if (enc == NULL)
elog(ERROR, "No such encoding");
elog(ERROR, "No such encoding as '%s'", namebuf);
resultlen = enc->decode_len(VARDATA(data), datalen);
result = palloc(VARHDRSZ + resultlen);
res = enc->decode(VARDATA(data), datalen, VARDATA(result));
/* Make this FATAL 'cause we've trodden on memory ... */
if (res > resultlen)
elog(ERROR, "Overflow - decode estimate too small");
elog(FATAL, "Overflow - decode estimate too small");
VARATT_SIZEP(result) = VARHDRSZ + res;
@ -339,14 +342,12 @@ esc_encode(const uint8 *src, unsigned srclen, uint8 *dst)
{
const uint8 *end = src + srclen;
uint8 *rp = dst;
int val;
int len = 0;
while (src < end)
{
if (*src == '\0')
{
val = *src;
rp[0] = '\\';
rp[1] = '0';
rp[2] = '0';
@ -356,7 +357,6 @@ esc_encode(const uint8 *src, unsigned srclen, uint8 *dst)
}
else if (*src == '\\')
{
val = *src;
rp[0] = '\\';
rp[1] = '\\';
rp += 2;
@ -370,7 +370,6 @@ esc_encode(const uint8 *src, unsigned srclen, uint8 *dst)
src++;
}
*rp = '\0';
return len;
}
@ -380,7 +379,6 @@ esc_decode(const uint8 *src, unsigned srclen, uint8 *dst)
{
const uint8 *end = src + srclen;
uint8 *rp = dst;
int val;
int len = 0;
while (src < end)
@ -389,11 +387,13 @@ esc_decode(const uint8 *src, unsigned srclen, uint8 *dst)
{
*rp++ = *src++;
}
else if ( (src[0] == '\\') &&
else if ( src+3 < end &&
(src[1] >= '0' && src[1] <= '3') &&
(src[2] >= '0' && src[2] <= '7') &&
(src[3] >= '0' && src[3] <= '7') )
{
int val;
val = VAL(src[1]);
val <<= 3;
val += VAL(src[2]);
@ -401,7 +401,7 @@ esc_decode(const uint8 *src, unsigned srclen, uint8 *dst)
*rp++ = val + VAL(src[3]);
src += 4;
}
else if ( (src[0] == '\\') &&
else if ( src+1 < end &&
(src[1] == '\\') )
{
*rp++ = '\\';
@ -418,6 +418,7 @@ esc_decode(const uint8 *src, unsigned srclen, uint8 *dst)
len++;
}
return len;
}
@ -439,11 +440,6 @@ esc_enc_len(const uint8 *src, unsigned srclen)
src++;
}
/*
* Allow for null terminator
*/
len++;
return len;
}
@ -459,7 +455,7 @@ esc_dec_len(const uint8 *src, unsigned srclen)
{
src++;
}
else if ( (src[0] == '\\') &&
else if ( src+3 < end &&
(src[1] >= '0' && src[1] <= '3') &&
(src[2] >= '0' && src[2] <= '7') &&
(src[3] >= '0' && src[3] <= '7') )
@ -469,7 +465,7 @@ esc_dec_len(const uint8 *src, unsigned srclen)
*/
src += 4;
}
else if ( (src[0] == '\\') &&
else if ( src+1 < end &&
(src[1] == '\\') )
{
/*
@ -510,7 +506,7 @@ pg_find_encoding(const char *name)
int i;
for (i = 0; enclist[i].name; i++)
if (!strcasecmp(enclist[i].name, name))
if (strcasecmp(enclist[i].name, name) == 0)
return &enclist[i].enc;
return NULL;