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/***************************************************************************
unzip.h
ZIP file management.
****************************************************************************
Copyright Aaron Giles
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form 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.
* Neither the name 'MAME' nor the names of its contributors may be
used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY AARON GILES ''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 AARON GILES 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.
***************************************************************************/
#pragma once
#ifndef __UNZIP_H__
#define __UNZIP_H__
#include "osdcore.h"
/***************************************************************************
CONSTANTS
***************************************************************************/
#define ZIP_DECOMPRESS_BUFSIZE 16384
/* Error types */
enum _zip_error
{
ZIPERR_NONE = 0,
ZIPERR_OUT_OF_MEMORY,
ZIPERR_FILE_ERROR,
ZIPERR_BAD_SIGNATURE,
ZIPERR_DECOMPRESS_ERROR,
ZIPERR_FILE_TRUNCATED,
ZIPERR_FILE_CORRUPT,
ZIPERR_UNSUPPORTED,
ZIPERR_BUFFER_TOO_SMALL
};
typedef enum _zip_error zip_error;
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
/* contains extracted file header information */
typedef struct _zip_file_header zip_file_header;
struct _zip_file_header
{
UINT32 signature; /* central file header signature */
UINT16 version_created; /* version made by */
UINT16 version_needed; /* version needed to extract */
UINT16 bit_flag; /* general purpose bit flag */
UINT16 compression; /* compression method */
UINT16 file_time; /* last mod file time */
UINT16 file_date; /* last mod file date */
UINT32 crc; /* crc-32 */
UINT32 compressed_length; /* compressed size */
UINT32 uncompressed_length; /* uncompressed size */
UINT16 filename_length; /* filename length */
UINT16 extra_field_length; /* extra field length */
UINT16 file_comment_length; /* file comment length */
UINT16 start_disk_number; /* disk number start */
UINT16 internal_attributes; /* internal file attributes */
UINT32 external_attributes; /* external file attributes */
UINT32 local_header_offset; /* relative offset of local header */
const char * filename; /* filename */
UINT8 * raw; /* pointer to the raw data */
UINT32 rawlength; /* length of the raw data */
UINT8 saved; /* saved byte from after filename */
};
/* contains extracted end of central directory information */
typedef struct _zip_ecd zip_ecd;
struct _zip_ecd
{
UINT32 signature; /* end of central dir signature */
UINT16 disk_number; /* number of this disk */
UINT16 cd_start_disk_number; /* number of the disk with the start of the central directory */
UINT16 cd_disk_entries; /* total number of entries in the central directory on this disk */
UINT16 cd_total_entries; /* total number of entries in the central directory */
UINT32 cd_size; /* size of the central directory */
UINT32 cd_start_disk_offset; /* offset of start of central directory with respect to the starting disk number */
UINT16 comment_length; /* .ZIP file comment length */
const char * comment; /* .ZIP file comment */
UINT8 * raw; /* pointer to the raw data */
UINT32 rawlength; /* length of the raw data */
};
/* describes an open ZIP file */
typedef struct _zip_file zip_file;
struct _zip_file
{
const char * filename; /* copy of ZIP filename (for caching) */
osd_file * file; /* OSD file handle */
UINT64 length; /* length of zip file */
zip_ecd ecd; /* end of central directory */
UINT8 * cd; /* central directory raw data */
UINT32 cd_pos; /* position in central directory */
zip_file_header header; /* current file header */
UINT8 buffer[ZIP_DECOMPRESS_BUFSIZE]; /* buffer for decompression */
};
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
/* ----- ZIP file access ----- */
/* open a ZIP file and parse its central directory */
zip_error zip_file_open(const char *filename, zip_file **zip);
/* close a ZIP file (may actually be left open due to caching) */
void zip_file_close(zip_file *zip);
/* clear out all open ZIP files from the cache */
void zip_file_cache_clear(void);
/* ----- contained file access ----- */
/* find the first file in the ZIP */
const zip_file_header *zip_file_first_file(zip_file *zip);
/* find the next file in the ZIP */
const zip_file_header *zip_file_next_file(zip_file *zip);
/* decompress the most recently found file in the ZIP */
zip_error zip_file_decompress(zip_file *zip, void *buffer, UINT32 length);
#endif /* __UNZIP_H__ */
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