mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-09 12:25:16 +01:00
28775cc3aa
---------- * added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX rotation/scaling, etc) * added .ISO & .BIN CD image file support * added 512K backup cartridge RAM support * added savestate support for CD games NOTES: ~~~~~~ * to play CD games, original BIOS ROM files are required in /genplus/bios/ directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin * CD audio tracks (CD-DA) are not supported (yet) [Core/CPU] ---------- * modified 68k core for Mega CD / Sega CD support [Core/VDP] --------------- * improved DMA accuracy * added support for 8-bit VRAM writes with undocumented code value (verified on real hardware by Nemesis) [Gamecube/Wii] --------------- * modified Master System & Game Gear "BIOS" support (files should be named bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios directory). * replaced "Hard Reset" button by a Soft Reset for systems having a Reset button (Mega Drive / Genesis & Master System) * State & SRAM files are now only compressed when saving to Gamecube Memory Cards * various fixes & cleanup. [Core/SCD] ---------- * added Mega CD / Sega CD hardware emulation (incl. Sub 68K, CDD, CDC, PCM, GFX rotation/scaling, etc) * added .ISO & .BIN CD image file support * added 512K backup cartridge RAM support * added savestate support for CD games NOTES: ~~~~~~ * to play CD games, original BIOS ROM files are required in /genplus/bios/ directory: unzip & rename them to bios_CD_U.bin, bios_CD_E.bin, bios_CD_J.bin * CD audio tracks (CD-DA) are not supported (yet) [Core/CPU] ---------- * modified 68k core for Mega CD / Sega CD support [Core/VDP] --------------- * improved DMA accuracy * added support for 8-bit VRAM writes with undocumented code value (verified on real hardware by Nemesis) [Gamecube/Wii] --------------- * modified Master System & Game Gear "BIOS" support (files should be named bios_U.sms, bios_J.sms, bios_E.sms & bios.gg and copied to /genplus/bios directory). * replaced "Hard Reset" button by a Soft Reset for systems having a Reset button (Mega Drive / Genesis & Master System) * State & SRAM files are now only compressed when saving to Gamecube Memory Cards * various fixes & cleanup.
168 lines
4.6 KiB
C
168 lines
4.6 KiB
C
/*
|
|
* 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 <windows.h>
|
|
#include <zlib.h>
|
|
|
|
static int check_zip(char *filename);
|
|
static int gzsize(gzFile *gd);
|
|
|
|
int load_archive(char *filename, unsigned char *buffer, int maxsize)
|
|
{
|
|
int size = 0;
|
|
|
|
if(check_zip(filename))
|
|
{
|
|
unz_file_info info;
|
|
int ret = 0;
|
|
|
|
/* 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, filename, 128, NULL, 0, NULL, 0);
|
|
if(ret != UNZ_OK)
|
|
{
|
|
unzClose(fd);
|
|
return 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);
|
|
|
|
/* 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);
|
|
}
|
|
|
|
|
|
/*
|
|
Returns the size of a GZ compressed file.
|
|
*/
|
|
static int gzsize(gzFile *gd)
|
|
{
|
|
#define CHUNKSIZE (0x10000)
|
|
int size = 0, length = 0;
|
|
unsigned char buffer[CHUNKSIZE];
|
|
gzrewind(gd);
|
|
do
|
|
{
|
|
size = gzread(gd, buffer, CHUNKSIZE);
|
|
if(size <= 0) break;
|
|
length += size;
|
|
}
|
|
while (!gzeof(gd));
|
|
gzrewind(gd);
|
|
return (length);
|
|
#undef CHUNKSIZE
|
|
}
|