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/**
* Navit, a modular navigation system.
* Copyright (C) 2005-2018 Navit Team
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "navit_lfs.h"
#include <stdlib.h>
#include "maptool.h"
#include "debug.h"
/**
* @brief Saves a buffer to a file
*
* This function saves a buffer to a file.
*
* @param filename The name of the while to where the buffer is saved to.
* @param b Buffer which is saved to file.
* @param offset
*/
void save_buffer(char *filename, struct buffer *b, long long offset) {
FILE *f;
f=fopen(filename,"rb+");
if (! f)
f=fopen(filename,"wb+");
dbg_assert(f != NULL);
dbg_assert(fseeko(f, offset, SEEK_SET)==0);
dbg_assert(fwrite(b->base, b->size, 1, f)==1);
fclose(f);
}
/**
* @brief Loads a buffer from a file
*
* This function loads a buffer from a file.
*
* @param filename The name of the while to where the buffer is loaded from.
* @param b Buffer in which file is loaded.
* @param offset
* @return indicator if operation suceeded
*/
int load_buffer(char *filename, struct buffer *b, long long offset, long long size) {
FILE *f;
long long len;
dbg_assert(size>=0);
dbg_assert(offset>=0);
g_free(b->base);
b->malloced=0;
f=fopen(filename,"rb");
fseeko(f, 0, SEEK_END);
len=ftello(f);
dbg_assert(len>=0);
if (offset+size > len) {
size=len-offset;
}
b->size=b->malloced=size;
dbg_assert(b->size>0);
fseeko(f, offset, SEEK_SET);
b->base=g_malloc(b->size);
if (fread(b->base, b->size, 1, f) == 0) {
dbg(lvl_warning, "fread failed");
fclose(f);
return 0;
}
fclose(f);
return 1;
}
/**
* @brief Determines size of buffer for file
*
* This function determines the size of the buffer required to read a file.
*
* @param filename Name of file for which the required size of the buffer is determined
* @return required size of buffer
*/
long long sizeof_buffer(char *filename) {
long long ret;
FILE *f=fopen(filename,"rb");
fseeko(f, 0, SEEK_END);
ret=ftello(f);
fclose(f);
return ret;
}
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