/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Authors:
* Michael Zucchi <notzed@ximian.com>
* Dan Winship <danw@ximian.com>
*
* Copyright (C) 2000, 2001 Ximian, Inc.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "camel-file-utils.h"
#include <netinet/in.h>
/**
* camel_file_util_encode_uint32:
* @out: file to output to
* @value: value to output
*
* Utility function to save an uint32 to a file.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_encode_uint32 (FILE *out, guint32 value)
{
int i;
for (i = 28; i > 0; i -= 7) {
if (value >= (1 << i)) {
unsigned int c = (value >> i) & 0x7f;
if (fputc (c, out) == -1)
return -1;
}
}
return fputc (value | 0x80, out);
}
/**
* camel_file_util_decode_uint32:
* @in: file to read from
* @dest: pointer to a variable to store the value in
*
* Retrieve an encoded uint32 from a file.
*
* Return value: 0 on success, -1 on error. @*dest will contain the
* decoded value.
**/
int
camel_file_util_decode_uint32 (FILE *in, guint32 *dest)
{
guint32 value = 0;
int v;
/* until we get the last byte, keep decoding 7 bits at a time */
while ( ((v = fgetc (in)) & 0x80) == 0 && v!=EOF) {
value |= v;
value <<= 7;
}
if (v == EOF) {
*dest = value >> 7;
return -1;
}
*dest = value | (v & 0x7f);
return 0;
}
/**
* camel_file_util_encode_fixed_int32:
* @out: file to output to
* @value: value to output
*
* Encode a gint32, performing no compression, but converting
* to network order.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_encode_fixed_int32 (FILE *out, gint32 value)
{
guint32 save;
save = htonl (value);
if (fwrite (&save, sizeof (save), 1, out) != 1)
return -1;
return 0;
}
/**
* camel_file_util_decode_fixed_int32:
* @in: file to read from
* @dest: pointer to a variable to store the value in
*
* Retrieve a gint32.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_decode_fixed_int32 (FILE *in, gint32 *dest)
{
guint32 save;
if (fread (&save, sizeof (save), 1, in) == 1) {
*dest = ntohl (save);
return 0;
} else {
return -1;
}
}
/**
* camel_file_util_encode_time_t:
* @out: file to output to
* @value: value to output
*
* Encode a time_t value to the file.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_encode_time_t(FILE *out, time_t value)
{
int i;
for (i = sizeof (time_t) - 1; i >= 0; i--) {
if (fputc((value >> (i * 8)) & 0xff, out) == -1)
return -1;
}
return 0;
}
/**
* camel_file_util_decode_time_t:
* @in: file to read from
* @dest: pointer to a variable to store the value in
*
* Decode a time_t value.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_decode_time_t (FILE *in, time_t *dest)
{
time_t save = 0;
int v, i = sizeof (time_t) - 1;
while (i >= 0 && (v = fgetc (in)) != EOF) {
save |= ((time_t)v) << (i * 8);
i--;
}
*dest = save;
if (v == EOF)
return -1;
return 0;
}
/**
* camel_file_util_encode_off_t:
* @out: file to output to
* @value: value to output
*
* Encode an off_t type.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_encode_off_t (FILE *out, off_t value)
{
int i;
for (i = sizeof (off_t) - 1; i >= 0; i--) {
if (fputc ((value >> (i * 8)) & 0xff, out) == -1)
return -1;
}
return 0;
}
/**
* camel_file_util_decode_off_t:
* @in: file to read from
* @dest: pointer to a variable to put the value in
*
* Decode an off_t type.
*
* Return value: 0 on success, -1 on failure.
**/
int
camel_file_util_decode_off_t (FILE *in, off_t *dest)
{
off_t save = 0;
int v, i = sizeof(off_t) - 1;
while (i >= 0 && (v = fgetc (in)) != EOF) {
save |= ((off_t)v) << (i * 8);
i--;
}
*dest = save;
if (v == EOF)
return -1;
return 0;
}
/**
* camel_file_util_encode_string:
* @out: file to output to
* @str: value to output
*
* Encode a normal string and save it in the output file.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_encode_string (FILE *out, const char *str)
{
register int len;
if (str == NULL)
return camel_file_util_encode_uint32 (out, 0);
len = strlen (str);
if (camel_file_util_encode_uint32 (out, len+1) == -1)
return -1;
if (len == 0 || fwrite (str, len, 1, out) == 1)
return 0;
return -1;
}
/**
* camel_file_util_decode_string:
* @in: file to read from
* @str: pointer to a variable to store the value in
*
* Decode a normal string from the input file.
*
* Return value: 0 on success, -1 on error.
**/
int
camel_file_util_decode_string (FILE *in, char **str)
{
guint32 len;
register char *ret;
if (camel_file_util_decode_uint32 (in, &len) == -1) {
*str = NULL;
return -1;
}
len--;
if (len > 65536) {
*str = NULL;
return -1;
}
ret = g_malloc (len+1);
if (len > 0 && fread (ret, len, 1, in) != 1) {
g_free (ret);
*str = NULL;
return -1;
}
ret[len] = 0;
*str = ret;
return 0;
}
