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78 lines
2.6 KiB
Objective-C
78 lines
2.6 KiB
Objective-C
/*
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* XADNSISBzip2Handle.h
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#import "CSBlockStreamHandle.h"
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#import "BWT.h"
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#import <stdbool.h>
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/* Constants for huffman coding */
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#define MAX_GROUPS 6
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#define GROUP_SIZE 50 /* 64 would have been more efficient */
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#define MAX_HUFCODE_BITS 20 /* Longest huffman code allowed */
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#define MAX_SYMBOLS 258 /* 256 literals + RUNA + RUNB */
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#define SYMBOL_RUNA 0
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#define SYMBOL_RUNB 1
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/* Other housekeeping constants */
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#define IOBUF_SIZE 4096
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/* This is what we know about each huffman coding group */
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struct group_data {
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/* We have an extra slot at the end of limit[] for a sentinal value. */
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int limit[MAX_HUFCODE_BITS+1],base[MAX_HUFCODE_BITS],permute[MAX_SYMBOLS];
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int minLen, maxLen;
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};
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/* Structure holding all the housekeeping data, including IO buffers and
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memory that persists between calls to bunzip */
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typedef struct {
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/* State for interrupting output loop */
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int writeCopies,writePos,writeRunCountdown,writeCount,writeCurrent;
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/* I/O tracking data (file handles, buffers, positions, etc.) */
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CSHandle *inhandle;
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int inbufCount,inbufPos;
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unsigned char inbuf[IOBUF_SIZE];
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unsigned int inbufBitCount, inbufBits;
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bool hasrand;
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/* Intermediate buffer and its size (in bytes) */
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unsigned int *dbuf, dbufSize;
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/* These things are a bit too big to go on the stack */
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unsigned char selectors[32768]; /* nSelectors=15 bits */
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struct group_data groups[MAX_GROUPS]; /* huffman coding tables */
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/* For I/O error handling */
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jmp_buf jmpbuf;
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} bunzip_data;
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@interface XADNSISBzip2Handle:CSBlockStreamHandle
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{
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off_t startoffs;
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BOOL hasrand;
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bunzip_data bd;
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uint32_t blocktable[900000];
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uint8_t outblock[65536];
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}
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-(id)initWithHandle:(CSHandle *)handle length:(off_t)length hasRandomizationBit:(BOOL)hasrandbit;
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-(void)resetBlockStream;
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-(int)produceBlockAtOffset:(off_t)pos;
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@end
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