mirror of
https://git.notmuchmail.org/git/notmuch
synced 2024-11-27 13:17:56 +01:00
1a8916786f
This is the result of running
$ uncrustify --replace --config ../devel/uncrustify.cfg *.c *.h
in the util directory
159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
/* hex-escape.c - Manage encoding and decoding of byte strings into path names
|
|
*
|
|
* Copyright (c) 2011 David Bremner
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see https://www.gnu.org/licenses/ .
|
|
*
|
|
* Author: David Bremner <david@tethera.net>
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <talloc.h>
|
|
#include <ctype.h>
|
|
#include "error_util.h"
|
|
#include "hex-escape.h"
|
|
|
|
static const char *output_charset =
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-_@=.,";
|
|
|
|
static const char escape_char = '%';
|
|
|
|
static int
|
|
is_output (char c)
|
|
{
|
|
return (strchr (output_charset, c) != NULL);
|
|
}
|
|
|
|
static int
|
|
maybe_realloc (void *ctx, size_t needed, char **out, size_t *out_size)
|
|
{
|
|
if (*out_size < needed) {
|
|
|
|
if (*out == NULL)
|
|
*out = talloc_size (ctx, needed);
|
|
else
|
|
*out = talloc_realloc (ctx, *out, char, needed);
|
|
|
|
if (*out == NULL)
|
|
return 0;
|
|
|
|
*out_size = needed;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
hex_status_t
|
|
hex_encode (void *ctx, const char *in, char **out, size_t *out_size)
|
|
{
|
|
|
|
const char *p;
|
|
char *q;
|
|
|
|
size_t needed = 1; /* for the NUL */
|
|
|
|
assert (ctx); assert (in); assert (out); assert (out_size);
|
|
|
|
for (p = in; *p; p++) {
|
|
needed += is_output (*p) ? 1 : 3;
|
|
}
|
|
|
|
if (*out == NULL)
|
|
*out_size = 0;
|
|
|
|
if (! maybe_realloc (ctx, needed, out, out_size))
|
|
return HEX_OUT_OF_MEMORY;
|
|
|
|
q = *out;
|
|
p = in;
|
|
|
|
while (*p) {
|
|
if (is_output (*p)) {
|
|
*q++ = *p++;
|
|
} else {
|
|
sprintf (q, "%%%02x", (unsigned char) *p++);
|
|
q += 3;
|
|
}
|
|
}
|
|
|
|
*q = '\0';
|
|
return HEX_SUCCESS;
|
|
}
|
|
|
|
/* Hex decode 'in' to 'out'.
|
|
*
|
|
* This must succeed for in == out to support hex_decode_inplace().
|
|
*/
|
|
static hex_status_t
|
|
hex_decode_internal (const char *in, unsigned char *out)
|
|
{
|
|
char buf[3];
|
|
|
|
while (*in) {
|
|
if (*in == escape_char) {
|
|
char *endp;
|
|
|
|
/* This also handles unexpected end-of-string. */
|
|
if (! isxdigit ((unsigned char) in[1]) ||
|
|
! isxdigit ((unsigned char) in[2]))
|
|
return HEX_SYNTAX_ERROR;
|
|
|
|
buf[0] = in[1];
|
|
buf[1] = in[2];
|
|
buf[2] = '\0';
|
|
|
|
*out = strtoul (buf, &endp, 16);
|
|
|
|
if (endp != buf + 2)
|
|
return HEX_SYNTAX_ERROR;
|
|
|
|
in += 3;
|
|
out++;
|
|
} else {
|
|
*out++ = *in++;
|
|
}
|
|
}
|
|
|
|
*out = '\0';
|
|
|
|
return HEX_SUCCESS;
|
|
}
|
|
|
|
hex_status_t
|
|
hex_decode_inplace (char *s)
|
|
{
|
|
/* A decoded string is never longer than the encoded one, so it is
|
|
* safe to decode a string onto itself. */
|
|
return hex_decode_internal (s, (unsigned char *) s);
|
|
}
|
|
|
|
hex_status_t
|
|
hex_decode (void *ctx, const char *in, char **out, size_t *out_size)
|
|
{
|
|
const char *p;
|
|
size_t needed = 1; /* for the NUL */
|
|
|
|
assert (ctx); assert (in); assert (out); assert (out_size);
|
|
|
|
for (p = in; *p; p++)
|
|
if ((p[0] == escape_char) && isxdigit (p[1]) && isxdigit (p[2]))
|
|
needed -= 1;
|
|
else
|
|
needed += 1;
|
|
|
|
if (! maybe_realloc (ctx, needed, out, out_size))
|
|
return HEX_OUT_OF_MEMORY;
|
|
|
|
return hex_decode_internal (in, (unsigned char *) *out);
|
|
}
|