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/*-
* Copyright (c) 2014-2019 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __fill_hex --
* In-memory conversion of raw bytes to a hexadecimal representation.
*/
static inline void
__fill_hex(const uint8_t *src, size_t src_max,
uint8_t *dest, size_t dest_max, size_t *lenp)
{
uint8_t *dest_orig;
dest_orig = dest;
if (dest_max > 0) /* save a byte for nul-termination */
--dest_max;
for (; src_max > 0 && dest_max > 1;
src_max -= 1, dest_max -= 2, ++src) {
*dest++ = __wt_hex((*src & 0xf0) >> 4);
*dest++ = __wt_hex(*src & 0x0f);
}
*dest++ = '\0';
if (lenp != NULL)
*lenp = WT_PTRDIFF(dest, dest_orig);
}
/*
* __wt_fill_hex --
* In-memory conversion of raw bytes to a hexadecimal representation.
*/
void
__wt_fill_hex(const uint8_t *src, size_t src_max,
uint8_t *dest, size_t dest_max, size_t *lenp)
{
__fill_hex(src, src_max, dest, dest_max, lenp);
}
/*
* __wt_raw_to_hex --
* Convert a chunk of data to a nul-terminated printable hex string.
*/
int
__wt_raw_to_hex(
WT_SESSION_IMPL *session, const uint8_t *from, size_t size, WT_ITEM *to)
{
size_t len;
/*
* Every byte takes up 2 spaces, plus a trailing nul byte.
*/
len = size * 2 + 1;
WT_RET(__wt_buf_init(session, to, len));
__fill_hex(from, size, to->mem, len, &to->size);
return (0);
}
/*
* __wt_raw_to_esc_hex --
* Convert a chunk of data to a nul-terminated printable string using
* escaped hex, as necessary.
*/
int
__wt_raw_to_esc_hex(
WT_SESSION_IMPL *session, const uint8_t *from, size_t size, WT_ITEM *to)
{
size_t i;
const uint8_t *p;
u_char *t;
/*
* In the worst case, every character takes up 3 spaces, plus a
* trailing nul byte.
*/
WT_RET(__wt_buf_init(session, to, size * 3 + 1));
for (p = from, t = to->mem, i = size; i > 0; --i, ++p)
if (__wt_isprint((u_char)*p)) {
if (*p == '\\')
*t++ = '\\';
*t++ = *p;
} else {
*t++ = '\\';
*t++ = __wt_hex((*p & 0xf0) >> 4);
*t++ = __wt_hex(*p & 0x0f);
}
*t++ = '\0';
to->size = WT_PTRDIFF(t, to->mem);
return (0);
}
/*
* __wt_hex2byte --
* Convert a pair of hex characters into a byte.
*/
int
__wt_hex2byte(const u_char *from, u_char *to)
{
uint8_t byte;
switch (from[0]) {
case '0': byte = 0; break;
case '1': byte = 1 << 4; break;
case '2': byte = 2 << 4; break;
case '3': byte = 3 << 4; break;
case '4': byte = 4 << 4; break;
case '5': byte = 5 << 4; break;
case '6': byte = 6 << 4; break;
case '7': byte = 7 << 4; break;
case '8': byte = 8 << 4; break;
case '9': byte = 9 << 4; break;
case 'A': byte = 10 << 4; break;
case 'B': byte = 11 << 4; break;
case 'C': byte = 12 << 4; break;
case 'D': byte = 13 << 4; break;
case 'E': byte = 14 << 4; break;
case 'F': byte = 15 << 4; break;
case 'a': byte = 10 << 4; break;
case 'b': byte = 11 << 4; break;
case 'c': byte = 12 << 4; break;
case 'd': byte = 13 << 4; break;
case 'e': byte = 14 << 4; break;
case 'f': byte = 15 << 4; break;
default:
return (1);
}
switch (from[1]) {
case '0': break;
case '1': byte |= 1; break;
case '2': byte |= 2; break;
case '3': byte |= 3; break;
case '4': byte |= 4; break;
case '5': byte |= 5; break;
case '6': byte |= 6; break;
case '7': byte |= 7; break;
case '8': byte |= 8; break;
case '9': byte |= 9; break;
case 'A': byte |= 10; break;
case 'B': byte |= 11; break;
case 'C': byte |= 12; break;
case 'D': byte |= 13; break;
case 'E': byte |= 14; break;
case 'F': byte |= 15; break;
case 'a': byte |= 10; break;
case 'b': byte |= 11; break;
case 'c': byte |= 12; break;
case 'd': byte |= 13; break;
case 'e': byte |= 14; break;
case 'f': byte |= 15; break;
default:
return (1);
}
*to = byte;
return (0);
}
/*
* __hex_fmterr --
* Hex format error message.
*/
static int
__hex_fmterr(WT_SESSION_IMPL *session)
{
WT_RET_MSG(session, EINVAL, "Invalid format in hexadecimal string");
}
/*
* __wt_hex_to_raw --
* Convert a nul-terminated printable hex string to a chunk of data.
*/
int
__wt_hex_to_raw(WT_SESSION_IMPL *session, const char *from, WT_ITEM *to)
{
return (__wt_nhex_to_raw(session, from, strlen(from), to));
}
/*
* __wt_nhex_to_raw --
* Convert a printable hex string to a chunk of data.
*/
int
__wt_nhex_to_raw(
WT_SESSION_IMPL *session, const char *from, size_t size, WT_ITEM *to)
{
const u_char *p;
u_char *t;
if (size % 2 != 0)
return (__hex_fmterr(session));
WT_RET(__wt_buf_init(session, to, size / 2));
for (p = (u_char *)from, t = to->mem; size > 0; p += 2, size -= 2, ++t)
if (__wt_hex2byte(p, t))
return (__hex_fmterr(session));
to->size = WT_PTRDIFF(t, to->mem);
return (0);
}
/*
* __wt_esc_hex_to_raw --
* Convert a printable string, encoded in escaped hex, to a chunk of data.
*/
int
__wt_esc_hex_to_raw(WT_SESSION_IMPL *session, const char *from, WT_ITEM *to)
{
const u_char *p;
u_char *t;
WT_RET(__wt_buf_init(session, to, strlen(from)));
for (p = (u_char *)from, t = to->mem; *p != '\0'; ++p, ++t) {
if ((*t = *p) != '\\')
continue;
++p;
if (p[0] != '\\') {
if (p[0] == '\0' || p[1] == '\0' || __wt_hex2byte(p, t))
return (__hex_fmterr(session));
++p;
}
}
to->size = WT_PTRDIFF(t, to->mem);
return (0);
}
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