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56 lines
1.8 KiB
Objective-C
56 lines
1.8 KiB
Objective-C
/*
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* XADPMArc1Handle.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 "XADLZSSHandle.h"
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typedef struct {
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uint8_t prev;
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uint8_t next;
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} XADPMA1HistoryNode;
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// History linked list. In the decode stream, codes representing
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// characters are not the character itself, but the number of
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// nodes to count back in time in the linked list. Every time
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// a character is output, it is moved to the front of the linked
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// list. The entry point index into the list is the last output
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// character, given by history_head;
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typedef struct {
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XADPMA1HistoryNode history[256];
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uint8_t history_head;
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} XADPMA1HistoryLinkedList;
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@interface XADPMArc1Handle:XADLZSSHandle
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{
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int bytesleft;
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bool nextismatch;
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// Pointer to the entry in byte_decode_table used to decode
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// byte value indices.
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const uint8_t *byte_decode_tree;
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// History linked list, for adaptively encoding byte values.
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XADPMA1HistoryLinkedList history_list;
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}
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-(id)initWithHandle:(CSHandle *)handle length:(off_t)length;
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-(int)nextLiteralOrOffset:(int *)offset andLength:(int *)length atPosition:(off_t)pos;
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@end
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