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/* 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>
/* Solaris 8 needs sys/types.h before time.h. */
#include <sys/types.h>
#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_errno (errno);
*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_errno (errno);
*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;
}
/* 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_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 */
}
else
return (time_t)strtoul (timestamp, endp, 10);
}
static struct
{
char *name;
gpgme_error_t err;
} gnupg_errors[] =
{
{ "EOF", GPG_ERR_EOF },
{ "No_Error", GPG_ERR_NO_ERROR },
{ "General_Error", GPG_ERR_GENERAL },
{ "Out_Of_Core", GPG_ERR_ENOMEM },
{ "Invalid_Value", GPG_ERR_INV_VALUE },
{ "IO_Error", GPG_ERR_GENERAL },
{ "Resource_Limit", GPG_ERR_RESOURCE_LIMIT },
{ "Internal_Error", GPG_ERR_INTERNAL },
{ "Bad_Certificate", GPG_ERR_BAD_CERT },
{ "Bad_Certificate_Chain", GPG_ERR_BAD_CERT_CHAIN},
{ "Missing_Certificate", GPG_ERR_MISSING_CERT },
{ "No_Data", GPG_ERR_NO_DATA },
{ "Bad_Signature", GPG_ERR_BAD_SIGNATURE },
{ "Not_Implemented", GPG_ERR_NOT_IMPLEMENTED },
{ "Conflict", GPG_ERR_CONFLICT },
{ "Bug", GPG_ERR_BUG },
{ "Read_Error", GPG_ERR_GENERAL },
{ "Write_Error", GPG_ERR_GENERAL },
{ "Invalid_Line", GPG_ERR_GENERAL },
{ "Incomplete_Line", GPG_ERR_INCOMPLETE_LINE },
{ "Invalid_Response", GPG_ERR_INV_RESPONSE },
{ "Agent_Error", GPG_ERR_AGENT },
{ "No_Public_Key", GPG_ERR_NO_PUBKEY },
{ "No_Secret_Key", GPG_ERR_NO_SECKEY },
{ "File_Open_Error", GPG_ERR_GENERAL },
{ "File_Create_Error", GPG_ERR_GENERAL },
{ "File_Error", GPG_ERR_GENERAL },
{ "Not_Supported", GPG_ERR_NOT_SUPPORTED },
{ "Invalid_Data", GPG_ERR_INV_DATA },
{ "Assuan_Server_Fault", GPG_ERR_ASSUAN_SERVER_FAULT },
{ "Assuan_Error", GPG_ERR_ASSUAN },
{ "Invalid_Session_Key", GPG_ERR_INV_SESSION_KEY },
{ "Invalid_Sexp", GPG_ERR_INV_SEXP },
{ "Unsupported_Algorithm", GPG_ERR_UNSUPPORTED_ALGORITHM },
{ "No_PIN_Entry", GPG_ERR_NO_PIN_ENTRY },
{ "PIN_Entry_Error", GPG_ERR_NO_PIN_ENTRY },
{ "Bad_PIN", GPG_ERR_BAD_PIN },
{ "Bad_Passphrase", GPG_ERR_BAD_PASSPHRASE },
{ "Invalid_Name", GPG_ERR_INV_NAME },
{ "Bad_Public_Key", GPG_ERR_BAD_PUBKEY },
{ "Bad_Secret_Key", GPG_ERR_BAD_SECKEY },
{ "Bad_Data", GPG_ERR_BAD_DATA },
{ "Invalid_Parameter", GPG_ERR_INV_PARAMETER },
{ "Tribute_to_D_A", GPG_ERR_TRIBUTE_TO_D_A },
{ "No_Dirmngr", GPG_ERR_NO_DIRMNGR },
{ "Dirmngr_Error", GPG_ERR_DIRMNGR },
{ "Certificate_Revoked", GPG_ERR_CERT_REVOKED },
{ "No_CRL_Known", GPG_ERR_NO_CRL_KNOWN },
{ "CRL_Too_Old", GPG_ERR_CRL_TOO_OLD },
{ "Line_Too_Long", GPG_ERR_LINE_TOO_LONG },
{ "Not_Trusted", GPG_ERR_NOT_TRUSTED },
{ "Canceled", GPG_ERR_CANCELED },
{ "Bad_CA_Certificate", GPG_ERR_BAD_CA_CERT },
{ "Certificate_Expired", GPG_ERR_CERT_EXPIRED },
{ "Certificate_Too_Young", GPG_ERR_CERT_TOO_YOUNG },
{ "Unsupported_Certificate", GPG_ERR_UNSUPPORTED_CERT },
{ "Unknown_Sexp", GPG_ERR_UNKNOWN_SEXP },
{ "Unsupported_Protection", GPG_ERR_UNSUPPORTED_PROTECTION },
{ "Corrupted_Protection", GPG_ERR_CORRUPTED_PROTECTION },
{ "Ambiguous_Name", GPG_ERR_AMBIGUOUS_NAME },
{ "Card_Error", GPG_ERR_CARD },
{ "Card_Reset", GPG_ERR_CARD_RESET },
{ "Card_Removed", GPG_ERR_CARD_REMOVED },
{ "Invalid_Card", GPG_ERR_INV_CARD },
{ "Card_Not_Present", GPG_ERR_CARD_NOT_PRESENT },
{ "No_PKCS15_App", GPG_ERR_NO_PKCS15_APP },
{ "Not_Confirmed", GPG_ERR_NOT_CONFIRMED },
{ "Configuration_Error", GPG_ERR_CONFIGURATION },
{ "No_Policy_Match", GPG_ERR_NO_POLICY_MATCH },
{ "Invalid_Index", GPG_ERR_INV_INDEX },
{ "Invalid_Id", GPG_ERR_INV_ID },
{ "No_Scdaemon", GPG_ERR_NO_SCDAEMON },
{ "Scdaemon_Error", GPG_ERR_SCDAEMON },
{ "Unsupported_Protocol", GPG_ERR_UNSUPPORTED_PROTOCOL },
{ "Bad_PIN_Method", GPG_ERR_BAD_PIN_METHOD },
{ "Card_Not_Initialized", GPG_ERR_CARD_NOT_INITIALIZED },
{ "Unsupported_Operation", GPG_ERR_UNSUPPORTED_OPERATION },
{ "Wrong_Key_Usage", GPG_ERR_WRONG_KEY_USAGE }
};
gpgme_error_t
_gpgme_map_gnupg_error (char *errstr)
{
unsigned int i;
gpgme_error_t err = gpg_err_make (GPG_ERR_SOURCE_GPG, GPG_ERR_GENERAL);
/* Future version of GnuPG might return the error code directly, so
we first test for a a numerical value and use that verbatim.
Note that this numerical value might be followed by an
underschore and the textual representation of the error code. */
if (*errstr >= '0' && *errstr <= '9')
return strtoul (errstr, NULL, 10);
/* Well, this is a token, use the mapping table to get the error.
The drawback is that we won't receive an error source and have to
use GPG as source. */
for (i = 0; i < DIM (gnupg_errors); i++)
if (!strcmp (gnupg_errors[i].name, errstr))
err = gpg_err_make (GPG_ERR_SOURCE_GPG, gnupg_errors[i].err);
TRACE3 (DEBUG_CTX, "_gpgme_map_gnupg_error", 0,
"mapped %s to %s <%s>", errstr, gpgme_strerror (err),
gpgme_strsource (err));
return err;
}

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