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/*
* fileio.c
*
* Load a normal file, or ZIP/GZ archive into ROM buffer.
* Returns loaded ROM size (zero if an error occured)
*
*
* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Charles Mac Donald
* modified by Eke-Eke (Genesis Plus GX)
*
* Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met:
*
* - Redistributions may not be sold, nor may they be used in a commercial
* product or activity.
*
* - Redistributions that are modified from the original source must include the
* complete source code, including the source code for all components used by a
* binary built from the modified sources. However, as a special exception, the
* source code distributed need not include anything that is normally distributed
* (in either source or binary form) with the major components (compiler, kernel,
* and so on) of the operating system on which the executable runs, unless that
* component itself accompanies the executable.
*
* - Redistributions must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************************/
#include "shared.h"
#include <zlib.h>
static int check_zip(char *filename);
int load_archive(char *filename, unsigned char *buffer, int maxsize, char *extension)
{
int size = 0;
if(check_zip(filename))
{
unz_file_info info;
int ret = 0;
char fname[256];
/* Attempt to open the archive */
unzFile *fd = unzOpen(filename);
if (!fd) return 0;
/* Go to first file in archive */
ret = unzGoToFirstFile(fd);
if(ret != UNZ_OK)
{
unzClose(fd);
return 0;
}
/* Get file informations and update filename */
ret = unzGetCurrentFileInfo(fd, &info, fname, 256, NULL, 0, NULL, 0);
if(ret != UNZ_OK)
{
unzClose(fd);
return 0;
}
/* Compressed filename extension */
if (extension)
{
strncpy(extension, &fname[strlen(fname) - 3], 3);
extension[3] = 0;
}
/* Open the file for reading */
ret = unzOpenCurrentFile(fd);
if(ret != UNZ_OK)
{
unzClose(fd);
return 0;
}
/* Retrieve uncompressed file size */
size = info.uncompressed_size;
if(size > maxsize)
{
size = maxsize;
}
/* Read (decompress) the file */
ret = unzReadCurrentFile(fd, buffer, size);
if(ret != size)
{
unzCloseCurrentFile(fd);
unzClose(fd);
return 0;
}
/* Close the current file */
ret = unzCloseCurrentFile(fd);
if(ret != UNZ_OK)
{
unzClose(fd);
return 0;
}
/* Close the archive */
ret = unzClose(fd);
if(ret != UNZ_OK) return 0;
}
else
{
/* Open file */
gzFile *gd = gzopen(filename, "rb");
if (!gd) return 0;
/* Read file data */
size = gzread(gd, buffer, maxsize);
/* filename extension */
if (extension)
{
strncpy(extension, &filename[strlen(filename) - 3], 3);
extension[3] = 0;
}
/* Close file */
gzclose(gd);
}
/* Return loaded ROM size */
return size;
}
/*
Verifies if a file is a ZIP archive or not.
Returns: 1= ZIP archive, 0= not a ZIP archive
*/
static int check_zip(char *filename)
{
uint8 buf[2];
FILE *fd = fopen(filename, "rb");
if(!fd) return (0);
fread(buf, 2, 1, fd);
fclose(fd);
if(memcmp(buf, "PK", 2) == 0) return (1);
return (0);
}
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