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/*-------------------------------------------------------------------------
*
* hex_decode.c
* hex decoding
*
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/common/hex_decode.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#ifdef FRONTEND
#include "common/logging.h"
#else
#include "mb/pg_wchar.h"
#endif
#include "common/hex_decode.h"
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(const char *cp)
{
unsigned char c = (unsigned char) *cp;
int res = -1;
if (c < 127)
res = hexlookup[c];
if (res < 0)
{
#ifdef FRONTEND
pg_log_fatal("invalid hexadecimal digit");
exit(EXIT_FAILURE);
#else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid hexadecimal digit: \"%.*s\"",
pg_mblen(cp), cp)));
#endif
}
return (char) res;
}
uint64
hex_decode(const char *src, size_t 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;
s++;
if (s >= srcend)
{
#ifdef FRONTEND
pg_log_fatal("invalid hexadecimal data: odd number of digits");
exit(EXIT_FAILURE);
#else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid hexadecimal data: odd number of digits")));
#endif
}
v2 = get_hex(s);
s++;
*p++ = v1 | v2;
}
return p - dst;
}
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