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/*
 * The Python Imaging Library.
 * $Id$
 *
 * declarations for the ZIP codecs
 *
 * Copyright (c) Fredrik Lundh 1996.
 */

#include "zlib.h"

/* modes */
#define	ZIP_PNG	0		/* continuous, filtered image data */
#define	ZIP_PNG_PALETTE	1	/* non-continuous data, disable filtering */
#define	ZIP_TIFF_PREDICTOR 2	/* TIFF, with predictor */
#define	ZIP_TIFF 3		/* TIFF, without predictor */

typedef struct {

/* CONFIGURATION */

/* Codec mode */
    int mode;

/* Optimize (max compression) SLOW!!! */
    int optimize;

/* 0 no compression, 9 best compression, -1 default compression */
    int compress_level;
    /* compression strategy Z_XXX */
    int compress_type;

/* Predefined dictionary (experimental) */
    char* dictionary;
    int dictionary_size;

/* PRIVATE CONTEXT (set by decoder/encoder) */

z_stream z_stream;		/* (de)compression stream */

UINT8* previous;		/* previous line (allocated) */

int last_output;		/* # bytes last output by inflate */

/* Compressor specific stuff */
    UINT8* prior;		/* filter storage (allocated) */
    UINT8* up;
    UINT8* average;
    UINT8* paeth;

UINT8* output;		/* output data */

int prefix;			/* size of filter prefix (0 for TIFF data) */

int interlaced;		/* is the image interlaced? (PNG) */

int pass;			/* current pass of the interlaced image (PNG) */

} ZIPSTATE;

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✏️ Zip.h