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/* MiscGIFData.h
Copyright 1996 Uwe Hoffmann.
Copyright 1996 Netsurfer Inc.
This notice may not be removed from this source code.
The use and distribution of this software is governed by the
terms of the MiscKit license agreement. Refer to the license
document included with the MiscKit distribution for the terms.
Author: <bbum@friday.com>
Converted to OpenStep, September 1996, Uwe Hoffmann.
*/
/*
** Copyright 1990, 1991, 1993, David Koblas. (koblas@netcom.com)
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted,
** provided that the above copyright notice appear in all copies and that
** both that copyright notice and this permission notice appear in
** supporting documentation. This software is provided "as is" without
** express or implied warranty.
*/
#import <AppKit/AppKit.h>
typedef struct _MiscColorEntry32 {
unsigned char red:8;
unsigned char green:8;
unsigned char blue:8;
unsigned char alpha:8;
} MiscColorEntry32;
typedef struct _MiscColorEntry16 {
unsigned char red:4;
unsigned char green:4;
unsigned char blue:4;
unsigned char alpha:4;
} MiscColorEntry16;
/*"
* Maximum number of bits present in any single LWZ code.
"*/
#define MAX_LWZ_BITS 12
#ifndef FALSE
#define FALSE NO
#endif
#ifndef TRUE
#define TRUE YES
#endif
/// RETURN CODES
#define LWZ_NO_ERROR 0 // nothing amiss
#define LWZ_DONE -1 // missing EOD-- common, usually ignored.
#define LWZ_NO_EOD -2 // missing EOD-- common, usually ignored.
#define LWZ_CIRCULAR_ERR -3 // circular code-- fatal
#define LWZ_BIT_OVERRUN -4 // ran off end of bits
#define LWZ_DATA_BLOCK_ERR -5 // error reading data block
/*"
* Lempel-Welch-Ziv decompression state (rather large).
"*/
typedef struct __MiscLWZState {
/*" state used by miscLWZReadByte
"*/
int code_size;
int set_code_size;
int max_code;
int max_code_size;
int firstcode;
int oldcode;
int clear_code;
int end_code;
int table[2][ (1 << MAX_LWZ_BITS) ];
int stack[ (1 << MAX_LWZ_BITS) * 2];
int *stackPtr;
BOOL fresh;
BOOL zeroDataBlock;
/*" state used by GetCode, GetDataBlock
"*/
unsigned char buf[280];
int curbit;
int lastbit;
BOOL done;
int last_byte;
unsigned int alreadyRead;
} MiscLWZState;
@interface MiscGIFData:NSObject
{
@private
NSData *data;
unsigned int length;
unsigned int nbytes;
unsigned int alreadyRead;
NSRange range;
MiscLWZState *decompressionState;
}
- initWithGIFData:(NSData *)gifData;
- (void)resetStream;
- (void)setStream:(unsigned int)aPosition;
- (BOOL)atEOS;
- (BOOL)getHeader:(char *)buffer;
- (BOOL)getVersion:(char *)buffer;
- (BOOL)getLSD:(char *)buffer;
- (BOOL)getColorTable16:(MiscColorEntry16 *)buffer size:(unsigned int)tableSize;
- (BOOL)getColorTable32:(MiscColorEntry32 *)buffer size:(unsigned int)tableSize;
- (BOOL)getGCE:(char *)buffer;
- (BOOL)getImageDescriptor:(char *)buffer;
- (BOOL)getCharacter:(unsigned char *)buffer;
- (BOOL)startDecompressionEngine;
- (int)LWZReadByte;
- (BOOL)skipDataBlocks;
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.