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/*
 * The Python Imaging Library.
 * $Id$
 *
 * declarations for the IJG JPEG codec interface.
 *
 * Copyright (c) 1995-2001 by Secret Labs AB
 * Copyright (c) 1995-1996 by Fredrik Lundh
 */

#include "jpeglib.h"

#include <setjmp.h>

typedef struct {
    struct jpeg_error_mgr pub;	/* "public" fields */
    jmp_buf setjmp_buffer;	/* for return to caller */
} JPEGERROR;

/* -------------------------------------------------------------------- */
/* Decoder								*/

typedef struct {
    struct jpeg_source_mgr pub;
    int skip;
} JPEGSOURCE;

typedef struct {

/* CONFIGURATION */

/* Jpeg file mode (empty if not known) */
    char jpegmode[8+1];

/* Converter output mode (input to the shuffler).  If empty,
       convert conversions are disabled */
    char rawmode[8+1];

/* If set, trade quality for speed */
    int draft;

/* Scale factor (1, 2, 4, 8) */
    int scale;

/* PRIVATE CONTEXT (set by decoder) */

struct jpeg_decompress_struct cinfo;

JPEGERROR error;

JPEGSOURCE source;

} JPEGSTATE;

/* -------------------------------------------------------------------- */
/* Encoder								*/

typedef struct {
    struct jpeg_destination_mgr pub;
    /* might add something some other day */
} JPEGDESTINATION;

typedef struct {

/* CONFIGURATION */

/* Quality (1-100, 0 means default) */
    int quality;

/* Progressive mode */
    int progressive;

/* Smoothing factor (1-100, 0 means none) */
    int smooth;

/* Optimize Huffman tables (slow) */
    int optimize;

/* Stream type (0=full, 1=tables only, 2=image only) */
    int streamtype;

/* DPI setting (0=square pixels, otherwide DPI) */
    int xdpi, ydpi;

/* Chroma Subsampling (-1=default, 0=none, 1=medium, 2=high) */
    int subsampling;

/* Custom quantization tables () */
    unsigned int *qtables;

/* in factors of DCTSIZE2 */
    int qtablesLen;

/* Extra data (to be injected after header) */
    char* extra; int extra_size;

/* PRIVATE CONTEXT (set by encoder) */

struct jpeg_compress_struct cinfo;

JPEGERROR error;

JPEGDESTINATION destination;

int extra_offset;

int rawExifLen;   /* EXIF data length */
    char* rawExif;  /* EXIF buffer pointer */

} JPEGENCODERSTATE;

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✏️ Jpeg.h