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c3826f831e
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
107 lines
2.2 KiB
C
107 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* hex_decode.c
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* hex decoding
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*
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*
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* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/common/hex_decode.c
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef FRONTEND
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#include "postgres.h"
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#else
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#include "postgres_fe.h"
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#endif
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#ifdef FRONTEND
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#include "common/logging.h"
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#else
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#include "mb/pg_wchar.h"
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#endif
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#include "common/hex_decode.h"
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static const int8 hexlookup[128] = {
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1,
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-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
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};
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static inline char
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get_hex(const char *cp)
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{
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unsigned char c = (unsigned char) *cp;
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int res = -1;
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if (c < 127)
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res = hexlookup[c];
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if (res < 0)
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{
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#ifdef FRONTEND
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pg_log_fatal("invalid hexadecimal digit");
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exit(EXIT_FAILURE);
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#else
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid hexadecimal digit: \"%.*s\"",
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pg_mblen(cp), cp)));
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#endif
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}
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return (char) res;
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}
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uint64
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hex_decode(const char *src, size_t len, char *dst)
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{
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const char *s,
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*srcend;
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char v1,
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v2,
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*p;
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srcend = src + len;
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s = src;
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p = dst;
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while (s < srcend)
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{
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if (*s == ' ' || *s == '\n' || *s == '\t' || *s == '\r')
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{
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s++;
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continue;
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}
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v1 = get_hex(s) << 4;
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s++;
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if (s >= srcend)
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{
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#ifdef FRONTEND
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pg_log_fatal("invalid hexadecimal data: odd number of digits");
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exit(EXIT_FAILURE);
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#else
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid hexadecimal data: odd number of digits")));
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#endif
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}
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v2 = get_hex(s);
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s++;
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*p++ = v1 | v2;
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}
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return p - dst;
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}
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