mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-04 18:05:06 +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
/*
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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 <windows.h>
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#include <zlib.h>
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static int check_zip(char *filename);
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static int gzsize(gzFile *gd);
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int load_archive(char *filename, unsigned char *buffer, int maxsize)
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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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/* 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, filename, 128, 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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/* 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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/* 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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/*
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Returns the size of a GZ compressed file.
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*/
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static int gzsize(gzFile *gd)
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{
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#define CHUNKSIZE (0x10000)
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int size = 0, length = 0;
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unsigned char buffer[CHUNKSIZE];
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gzrewind(gd);
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do
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{
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size = gzread(gd, buffer, CHUNKSIZE);
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if(size <= 0) break;
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length += size;
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}
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while (!gzeof(gd));
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gzrewind(gd);
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return (length);
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#undef CHUNKSIZE
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}
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