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/* This file is part of libmspack.
* (C) 2003-2004 Stuart Caie.
*
* libmspack is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License (LGPL) version 2.1
*
* For further details, see the file COPYING.LIB distributed with libmspack
*/
#ifndef MSPACK_CAB_H
#define MSPACK_CAB_H 1
#include "mszip.h"
#include "qtm.h"
#include "lzx.h"
/* generic CAB definitions */
/* structure offsets */
#define cfhead_Signature (0x00)
#define cfhead_CabinetSize (0x08)
#define cfhead_FileOffset (0x10)
#define cfhead_MinorVersion (0x18)
#define cfhead_MajorVersion (0x19)
#define cfhead_NumFolders (0x1A)
#define cfhead_NumFiles (0x1C)
#define cfhead_Flags (0x1E)
#define cfhead_SetID (0x20)
#define cfhead_CabinetIndex (0x22)
#define cfhead_SIZEOF (0x24)
#define cfheadext_HeaderReserved (0x00)
#define cfheadext_FolderReserved (0x02)
#define cfheadext_DataReserved (0x03)
#define cfheadext_SIZEOF (0x04)
#define cffold_DataOffset (0x00)
#define cffold_NumBlocks (0x04)
#define cffold_CompType (0x06)
#define cffold_SIZEOF (0x08)
#define cffile_UncompressedSize (0x00)
#define cffile_FolderOffset (0x04)
#define cffile_FolderIndex (0x08)
#define cffile_Date (0x0A)
#define cffile_Time (0x0C)
#define cffile_Attribs (0x0E)
#define cffile_SIZEOF (0x10)
#define cfdata_CheckSum (0x00)
#define cfdata_CompressedSize (0x04)
#define cfdata_UncompressedSize (0x06)
#define cfdata_SIZEOF (0x08)
/* flags */
#define cffoldCOMPTYPE_MASK (0x000f)
#define cffoldCOMPTYPE_NONE (0x0000)
#define cffoldCOMPTYPE_MSZIP (0x0001)
#define cffoldCOMPTYPE_QUANTUM (0x0002)
#define cffoldCOMPTYPE_LZX (0x0003)
#define cfheadPREV_CABINET (0x0001)
#define cfheadNEXT_CABINET (0x0002)
#define cfheadRESERVE_PRESENT (0x0004)
#define cffileCONTINUED_FROM_PREV (0xFFFD)
#define cffileCONTINUED_TO_NEXT (0xFFFE)
#define cffileCONTINUED_PREV_AND_NEXT (0xFFFF)
/* CAB data blocks are <= 32768 bytes in uncompressed form. Uncompressed
* blocks have zero growth. MSZIP guarantees that it won't grow above
* uncompressed size by more than 12 bytes. LZX guarantees it won't grow
* more than 6144 bytes. Quantum has no documentation, but the largest
* block seen in the wild is 337 bytes above uncompressed size.
*/
#define CAB_BLOCKMAX (32768)
#define CAB_INPUTMAX (CAB_BLOCKMAX+6144)
/* CAB compression definitions */
struct mscab_compressor_p {
struct mscab_compressor base;
struct mspack_system *system;
/* todo */
};
/* CAB decompression definitions */
struct mscabd_decompress_state {
struct mscabd_folder_p *folder; /* current folder we're extracting from */
struct mscabd_folder_data *data; /* current folder split we're in */
unsigned int offset; /* uncompressed offset within folder */
unsigned int block; /* which block are we decompressing? */
struct mspack_system sys; /* special I/O code for decompressor */
int comp_type; /* type of compression used by folder */
int (*decompress)(void *, off_t); /* decompressor code */
void *state; /* decompressor state */
struct mscabd_cabinet_p *incab; /* cabinet where input data comes from */
struct mspack_file *infh; /* input file handle */
struct mspack_file *outfh; /* output file handle */
unsigned char *i_ptr, *i_end; /* input data consumed, end */
unsigned char input[CAB_INPUTMAX]; /* one input block of data */
};
struct mscab_decompressor_p {
struct mscab_decompressor base;
struct mscabd_decompress_state *d;
struct mspack_system *system;
int param[3]; /* !!! MATCH THIS TO NUM OF PARAMS IN MSPACK.H !!! */
int error, read_error;
};
struct mscabd_cabinet_p {
struct mscabd_cabinet base;
off_t blocks_off; /* offset to data blocks */
int block_resv; /* reserved space in data blocks */
};
/* there is one of these for every cabinet a folder spans */
struct mscabd_folder_data {
struct mscabd_folder_data *next;
struct mscabd_cabinet_p *cab; /* cabinet file of this folder span */
off_t offset; /* cabinet offset of first datablock */
};
struct mscabd_folder_p {
struct mscabd_folder base;
struct mscabd_folder_data data; /* where are the data blocks? */
struct mscabd_file *merge_prev; /* first file needing backwards merge */
struct mscabd_file *merge_next; /* first file needing forwards merge */
};
#endif
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