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