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move hex_decode() to /common so it can be called from frontend

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This allows removal of a copy of hex_decode() from ecpg, and will be
used by the soon-to-be added pg_alterckey command.

Backpatch-through: master
This commit is contained in:
Bruce Momjian
2020-12-24 17:25:48 -05:00
parent 7519bd16d1
commit c3826f831e
8 changed files with 127 additions and 116 deletions
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52
src/interfaces/ecpg/ecpglib/data.c
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@ -5,6 +5,7 @@
#include <math.h>
#include "common/hex_decode.h"
#include "ecpgerrno.h"
#include "ecpglib.h"
#include "ecpglib_extern.h"
@ -136,57 +137,6 @@ ecpg_hex_dec_len(unsigned srclen)
return srclen >> 1;
}
static inline char
get_hex(char c)
{
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,
};
int res = -1;
if (c > 0 && c < 127)
res = hexlookup[(unsigned char) c];
return (char) res;
}
static unsigned
hex_decode(const char *src, unsigned len, char *dst)
{
const char *s,
*srcend;
char v1,
v2,
*p;
srcend = src + len;
s = src;
p = dst;
while (s < srcend)
{
if (*s == ' ' || *s == '\n' || *s == '\t' || *s == '\r')
{
s++;
continue;
}
v1 = get_hex(*s++) << 4;
if (s >= srcend)
return -1;
v2 = get_hex(*s++);
*p++ = v1 | v2;
}
return p - dst;
}
unsigned
ecpg_hex_encode(const char *src, unsigned len, char *dst)
{