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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
unzip.h
ZIP file management.
***************************************************************************/
#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
};
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
/* contains extracted file header information */
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 */
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 */
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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