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/*
Do stuff to bzip2 files. Originally based on bzip2recover, which
is part of the standard bzip2 distribution.
Author: Patrick Collison <patrick@collison.ie>
Original author: Julian Seward <jseward@bzip.org>
*/
/* Caveat: I've a feeling this won't work unmodified on big-endian architectures */
#ifndef __BZIPREADER_H__
#define __BZIPREADER_H__
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <bzlib.h>
#include "debug.h"
#include "safe.h"
#define bytes(x) ((x) >> 3)
#define BLOCK_HEADER_HI 0x00003141UL
#define BLOCK_HEADER_LO 0x59265359UL
#define BLOCK_ENDMARK_HI 0x00001772UL
#define BLOCK_ENDMARK_LO 0x45385090UL
#define BIT_EOF 2
/* Increase if necessary. However, a .bz2 file with > 50000 blocks
would have an uncompressed size of at least 40GB, so the chances
are low you'll need to up this. */
#define BZ_MAX_HANDLED_BLOCKS 500000
/* 900kb */
/* FIXME */
#define BZ_MAX_BLOCK (1100 * 1024)
#define BZ_MAX_FILENAME 2000
/* Header bytes */
#define BZ_HDR_B 0x42 /* 'B' */
#define BZ_HDR_Z 0x5a /* 'Z' */
#define BZ_HDR_h 0x68 /* 'h' */
#define BZ_HDR_0 0x30 /* '0' */
typedef struct {
FILE *handle;
int32_t buffer;
int32_t buffLive;
char mode;
} BitStream;
typedef struct {
char *buff;
int32_t buffer;
int32_t buffLive;
uint64_t pos;
int32_t crc; /* logically, this doesn't belong here, but RubyInline... */
} BitBuffer;
FILE *xfopen(const char *path, const char *mode);
void xfclose(FILE *fp);
BitBuffer *bbOfSize(uint64_t size);
void bbClose(BitBuffer *bb);
int computeBoundaries(FILE *inFile);
int decompressBlock(char *src, uint32_t srcLen, char *dest, uint32_t *destLen);
uint64_t readBlock(FILE *inFile, uint64_t bitOffset, BitBuffer *bbOut);
uint64_t fixedOffset(uint64_t offset);
#endif
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