414 lines
9.7 KiB
C
414 lines
9.7 KiB
C
/* conversion.c - String conversion helper functions.
|
||
Copyright (C) 2000 Werner Koch (dd9jn)
|
||
Copyright (C) 2001, 2002, 2003, 2004, 2007 g10 Code GmbH
|
||
|
||
This file is part of GPGME.
|
||
|
||
GPGME is free software; you can redistribute it and/or modify it
|
||
under the terms of the GNU Lesser General Public License as
|
||
published by the Free Software Foundation; either version 2.1 of
|
||
the License, or (at your option) any later version.
|
||
|
||
GPGME 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
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
|
||
02111-1307, USA. */
|
||
|
||
#if HAVE_CONFIG_H
|
||
#include <config.h>
|
||
#endif
|
||
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#ifdef HAVE_SYS_TYPES_H
|
||
/* Solaris 8 needs sys/types.h before time.h. */
|
||
# include <sys/types.h>
|
||
#endif
|
||
#include <time.h>
|
||
#include <errno.h>
|
||
|
||
#include "gpgme.h"
|
||
#include "util.h"
|
||
#include "debug.h"
|
||
|
||
#define atoi_1(p) (*(p) - '0' )
|
||
#define atoi_2(p) ((atoi_1(p) * 10) + atoi_1((p)+1))
|
||
#define atoi_4(p) ((atoi_2(p) * 100) + atoi_2((p)+2))
|
||
|
||
|
||
|
||
/* Convert two hexadecimal digits from STR to the value they
|
||
represent. Returns -1 if one of the characters is not a
|
||
hexadecimal digit. */
|
||
int
|
||
_gpgme_hextobyte (const char *str)
|
||
{
|
||
int val = 0;
|
||
int i;
|
||
|
||
#define NROFHEXDIGITS 2
|
||
for (i = 0; i < NROFHEXDIGITS; i++)
|
||
{
|
||
if (*str >= '0' && *str <= '9')
|
||
val += *str - '0';
|
||
else if (*str >= 'A' && *str <= 'F')
|
||
val += 10 + *str - 'A';
|
||
else if (*str >= 'a' && *str <= 'f')
|
||
val += 10 + *str - 'a';
|
||
else
|
||
return -1;
|
||
if (i < NROFHEXDIGITS - 1)
|
||
val *= 16;
|
||
str++;
|
||
}
|
||
return val;
|
||
}
|
||
|
||
|
||
/* Decode the C formatted string SRC and store the result in the
|
||
buffer *DESTP which is LEN bytes long. If LEN is zero, then a
|
||
large enough buffer is allocated with malloc and *DESTP is set to
|
||
the result. Currently, LEN is only used to specify if allocation
|
||
is desired or not, the caller is expected to make sure that *DESTP
|
||
is large enough if LEN is not zero. */
|
||
gpgme_error_t
|
||
_gpgme_decode_c_string (const char *src, char **destp, size_t len)
|
||
{
|
||
char *dest;
|
||
|
||
/* Set up the destination buffer. */
|
||
if (len)
|
||
{
|
||
if (len < strlen (src) + 1)
|
||
return gpg_error (GPG_ERR_INTERNAL);
|
||
|
||
dest = *destp;
|
||
}
|
||
else
|
||
{
|
||
/* The converted string will never be larger than the original
|
||
string. */
|
||
dest = malloc (strlen (src) + 1);
|
||
if (!dest)
|
||
return gpg_error_from_syserror ();
|
||
|
||
*destp = dest;
|
||
}
|
||
|
||
/* Convert the string. */
|
||
while (*src)
|
||
{
|
||
if (*src != '\\')
|
||
{
|
||
*(dest++) = *(src++);
|
||
continue;
|
||
}
|
||
|
||
switch (src[1])
|
||
{
|
||
#define DECODE_ONE(match,result) \
|
||
case match: \
|
||
src += 2; \
|
||
*(dest++) = result; \
|
||
break;
|
||
|
||
DECODE_ONE ('\'', '\'');
|
||
DECODE_ONE ('\"', '\"');
|
||
DECODE_ONE ('\?', '\?');
|
||
DECODE_ONE ('\\', '\\');
|
||
DECODE_ONE ('a', '\a');
|
||
DECODE_ONE ('b', '\b');
|
||
DECODE_ONE ('f', '\f');
|
||
DECODE_ONE ('n', '\n');
|
||
DECODE_ONE ('r', '\r');
|
||
DECODE_ONE ('t', '\t');
|
||
DECODE_ONE ('v', '\v');
|
||
|
||
case 'x':
|
||
{
|
||
int val = _gpgme_hextobyte (&src[2]);
|
||
|
||
if (val == -1)
|
||
{
|
||
/* Should not happen. */
|
||
*(dest++) = *(src++);
|
||
*(dest++) = *(src++);
|
||
if (*src)
|
||
*(dest++) = *(src++);
|
||
if (*src)
|
||
*(dest++) = *(src++);
|
||
}
|
||
else
|
||
{
|
||
if (!val)
|
||
{
|
||
/* A binary zero is not representable in a C
|
||
string. */
|
||
*(dest++) = '\\';
|
||
*(dest++) = '0';
|
||
}
|
||
else
|
||
*((unsigned char *) dest++) = val;
|
||
src += 4;
|
||
}
|
||
}
|
||
break;
|
||
|
||
default:
|
||
{
|
||
/* Should not happen. */
|
||
*(dest++) = *(src++);
|
||
*(dest++) = *(src++);
|
||
}
|
||
}
|
||
}
|
||
*(dest++) = 0;
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Decode the percent escaped string SRC and store the result in the
|
||
buffer *DESTP which is LEN bytes long. If LEN is zero, then a
|
||
large enough buffer is allocated with malloc and *DESTP is set to
|
||
the result. Currently, LEN is only used to specify if allocation
|
||
is desired or not, the caller is expected to make sure that *DESTP
|
||
is large enough if LEN is not zero. If BINARY is 1, then '\0'
|
||
characters are allowed in the output. */
|
||
gpgme_error_t
|
||
_gpgme_decode_percent_string (const char *src, char **destp, size_t len,
|
||
int binary)
|
||
{
|
||
char *dest;
|
||
|
||
/* Set up the destination buffer. */
|
||
if (len)
|
||
{
|
||
if (len < strlen (src) + 1)
|
||
return gpg_error (GPG_ERR_INTERNAL);
|
||
|
||
dest = *destp;
|
||
}
|
||
else
|
||
{
|
||
/* The converted string will never be larger than the original
|
||
string. */
|
||
dest = malloc (strlen (src) + 1);
|
||
if (!dest)
|
||
return gpg_error_from_syserror ();
|
||
|
||
*destp = dest;
|
||
}
|
||
|
||
/* Convert the string. */
|
||
while (*src)
|
||
{
|
||
if (*src != '%')
|
||
{
|
||
*(dest++) = *(src++);
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
int val = _gpgme_hextobyte (&src[1]);
|
||
|
||
if (val == -1)
|
||
{
|
||
/* Should not happen. */
|
||
*(dest++) = *(src++);
|
||
if (*src)
|
||
*(dest++) = *(src++);
|
||
if (*src)
|
||
*(dest++) = *(src++);
|
||
}
|
||
else
|
||
{
|
||
if (!val && !binary)
|
||
{
|
||
/* A binary zero is not representable in a C
|
||
string. */
|
||
*(dest++) = '\\';
|
||
*(dest++) = '0';
|
||
}
|
||
else
|
||
*((unsigned char *) dest++) = val;
|
||
src += 3;
|
||
}
|
||
}
|
||
}
|
||
*(dest++) = 0;
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* Encode the string SRC with percent escaping and store the result in
|
||
the buffer *DESTP which is LEN bytes long. If LEN is zero, then a
|
||
large enough buffer is allocated with malloc and *DESTP is set to
|
||
the result. Currently, LEN is only used to specify if allocation
|
||
is desired or not, the caller is expected to make sure that *DESTP
|
||
is large enough if LEN is not zero. If BINARY is 1, then '\0'
|
||
characters are allowed in the output. */
|
||
gpgme_error_t
|
||
_gpgme_encode_percent_string (const char *src, char **destp, size_t len)
|
||
{
|
||
size_t destlen;
|
||
char *dest;
|
||
const char *str;
|
||
|
||
destlen = 0;
|
||
str = src;
|
||
/* We percent-escape the + character because the user might need a
|
||
"percent plus" escaped string (special gpg format). But we
|
||
percent-escape the space character, which works with and without
|
||
the special plus format. */
|
||
while (*str)
|
||
{
|
||
if (*str == '+' || *str == '\"' || *str == '%'
|
||
|| *(const unsigned char *)str <= 0x20)
|
||
destlen += 3;
|
||
else
|
||
destlen++;
|
||
str++;
|
||
}
|
||
/* Terminating nul byte. */
|
||
destlen++;
|
||
|
||
/* Set up the destination buffer. */
|
||
if (len)
|
||
{
|
||
if (len < destlen);
|
||
return gpg_error (GPG_ERR_INTERNAL);
|
||
|
||
dest = *destp;
|
||
}
|
||
else
|
||
{
|
||
/* The converted string will never be larger than the original
|
||
string. */
|
||
dest = malloc (destlen);
|
||
if (!dest)
|
||
return gpg_error_from_syserror ();
|
||
|
||
*destp = dest;
|
||
}
|
||
|
||
/* Convert the string. */
|
||
while (*src)
|
||
{
|
||
if (*src == '+' || *src == '\"' || *src == '%'
|
||
|| *(const unsigned char *)src <= 0x20)
|
||
{
|
||
snprintf (dest, 4, "%%%02X", *(unsigned char *)src);
|
||
dest += 3;
|
||
}
|
||
else
|
||
*(dest++) = *src;
|
||
src++;
|
||
}
|
||
*(dest++) = 0;
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
#ifdef HAVE_W32_SYSTEM
|
||
static time_t
|
||
_gpgme_timegm (struct tm *tm)
|
||
{
|
||
/* This one is thread safe. */
|
||
SYSTEMTIME st;
|
||
FILETIME ft;
|
||
unsigned long long cnsecs;
|
||
|
||
st.wYear = tm->tm_year + 1900;
|
||
st.wMonth = tm->tm_mon + 1;
|
||
st.wDay = tm->tm_mday;
|
||
st.wHour = tm->tm_hour;
|
||
st.wMinute = tm->tm_min;
|
||
st.wSecond = tm->tm_sec;
|
||
st.wMilliseconds = 0; /* Not available. */
|
||
st.wDayOfWeek = 0; /* Ignored. */
|
||
|
||
/* System time is UTC thus the conversion is pretty easy. */
|
||
if (!SystemTimeToFileTime (&st, &ft))
|
||
{
|
||
gpg_err_set_errno (EINVAL);
|
||
return (time_t)(-1);
|
||
}
|
||
|
||
cnsecs = (((unsigned long long)ft.dwHighDateTime << 32)
|
||
| ft.dwLowDateTime);
|
||
cnsecs -= 116444736000000000ULL; /* The filetime epoch is 1601-01-01. */
|
||
return (time_t)(cnsecs / 10000000ULL);
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Parse the string TIMESTAMP into a time_t. The string may either be
|
||
seconds since Epoch or in the ISO 8601 format like
|
||
"20390815T143012". Returns 0 for an empty string or seconds since
|
||
Epoch. Leading spaces are skipped. If ENDP is not NULL, it will
|
||
point to the next non-parsed character in TIMESTRING. */
|
||
time_t
|
||
_gpgme_parse_timestamp (const char *timestamp, char **endp)
|
||
{
|
||
/* Need to skip leading spaces, because that is what strtoul does
|
||
but not our ISO 8601 checking code. */
|
||
while (*timestamp && *timestamp== ' ')
|
||
timestamp++;
|
||
if (!*timestamp)
|
||
return 0;
|
||
|
||
if (strlen (timestamp) >= 15 && timestamp[8] == 'T')
|
||
{
|
||
struct tm buf;
|
||
int year;
|
||
|
||
year = atoi_4 (timestamp);
|
||
if (year < 1900)
|
||
return (time_t)(-1);
|
||
|
||
/* Fixme: We would better use a configure test to see whether
|
||
mktime can handle dates beyond 2038. */
|
||
if (sizeof (time_t) <= 4 && year >= 2038)
|
||
return (time_t)2145914603; /* 2037-12-31 23:23:23 */
|
||
|
||
memset (&buf, 0, sizeof buf);
|
||
buf.tm_year = year - 1900;
|
||
buf.tm_mon = atoi_2 (timestamp+4) - 1;
|
||
buf.tm_mday = atoi_2 (timestamp+6);
|
||
buf.tm_hour = atoi_2 (timestamp+9);
|
||
buf.tm_min = atoi_2 (timestamp+11);
|
||
buf.tm_sec = atoi_2 (timestamp+13);
|
||
|
||
if (endp)
|
||
*endp = (char*)(timestamp + 15);
|
||
#ifdef HAVE_W32_SYSTEM
|
||
return _gpgme_timegm (&buf);
|
||
#else
|
||
#ifdef HAVE_TIMEGM
|
||
return timegm (&buf);
|
||
#else
|
||
{
|
||
time_t tim;
|
||
|
||
putenv ("TZ=UTC");
|
||
tim = mktime (&buf);
|
||
#ifdef __GNUC__
|
||
#warning fixme: we must somehow reset TZ here. It is not threadsafe anyway.
|
||
#endif
|
||
return tim;
|
||
}
|
||
#endif /* !HAVE_TIMEGM */
|
||
#endif /* !HAVE_W32_SYSTEM */
|
||
}
|
||
else
|
||
return (time_t)strtoul (timestamp, endp, 10);
|
||
}
|