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Support hex-string input and output for type BYTEA.

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Both hex format and the traditional "escape" format are automatically
handled on input.  The output format is selected by the new GUC variable
bytea_output.

As committed, bytea_output defaults to HEX, which is an *incompatible
change*.  We will keep it this way for awhile for testing purposes, but
should consider whether to switch to the more backwards-compatible
default of ESCAPE before 8.5 is released.

Peter Eisentraut
This commit is contained in:
Tom Lane
2009-08-04 16:08:37 +00:00
parent f192e4a5d0
commit a2a8c7a662
21 changed files with 442 additions and 111 deletions
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60
src/interfaces/libpq/fe-exec.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.203 2009/06/11 14:49:13 momjian Exp $
* $PostgreSQL: pgsql/src/interfaces/libpq/fe-exec.c,v 1.204 2009/08/04 16:08:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3167,6 +3167,29 @@ PQescapeBytea(const unsigned char *from, size_t from_length, size_t *to_length)
}
static const int8 hexlookup[128] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
static inline char
get_hex(char c)
{
int res = -1;
if (c > 0 && c < 127)
res = hexlookup[(unsigned char) c];
return (char) res;
}
#define ISFIRSTOCTDIGIT(CH) ((CH) >= '0' && (CH) <= '3')
#define ISOCTDIGIT(CH) ((CH) >= '0' && (CH) <= '7')
#define OCTVAL(CH) ((CH) - '0')
@ -3198,6 +3221,40 @@ PQunescapeBytea(const unsigned char *strtext, size_t *retbuflen)
strtextlen = strlen((const char *) strtext);
if (strtext[0] == '\\' && strtext[1] == 'x')
{
const unsigned char *s;
unsigned char *p;
buflen = (strtextlen - 2)/2;
/* Avoid unportable malloc(0) */
buffer = (unsigned char *) malloc(buflen > 0 ? buflen : 1);
if (buffer == NULL)
return NULL;
s = strtext + 2;
p = buffer;
while (*s)
{
char v1,
v2;
/*
* Bad input is silently ignored. Note that this includes
* whitespace between hex pairs, which is allowed by byteain.
*/
v1 = get_hex(*s++);
if (!*s || v1 == (char) -1)
continue;
v2 = get_hex(*s++);
if (v2 != (char) -1)
*p++ = (v1 << 4) | v2;
}
buflen = p - buffer;
}
else
{
/*
* Length of input is max length of output, but add one to avoid
* unportable malloc(0) if input is zero-length.
@ -3244,6 +3301,7 @@ PQunescapeBytea(const unsigned char *strtext, size_t *retbuflen)
}
}
buflen = j; /* buflen is the length of the dequoted data */
}
/* Shrink the buffer to be no larger than necessary */
/* +1 avoids unportable behavior when buflen==0 */