jbig2.h

/*
    jbig2dec

    Copyright (C) 2002-2005 Artifex Software, Inc.

    This software is distributed under license and may not
    be copied, modified or distributed except as expressly
    authorized under the terms of the license contained in
    the file LICENSE in this distribution.

    For further licensing information refer to http://artifex.com/ or
    contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134,
    San Rafael, CA  94903, U.S.A., +1(415)492-9861.
*/

#ifdef __cplusplus
extern "C" {
#endif

#ifndef _JBIG2_H
#define _JBIG2_H

/* warning levels */
typedef enum {
  JBIG2_SEVERITY_DEBUG,
  JBIG2_SEVERITY_INFO,
  JBIG2_SEVERITY_WARNING,
  JBIG2_SEVERITY_FATAL
} Jbig2Severity;

typedef enum {
  JBIG2_OPTIONS_EMBEDDED = 1
} Jbig2Options;

/* forward public structure declarations */
typedef struct _Jbig2Allocator Jbig2Allocator;
typedef struct _Jbig2Ctx Jbig2Ctx;
typedef struct _Jbig2GlobalCtx Jbig2GlobalCtx;
typedef struct _Jbig2Segment Jbig2Segment;
typedef struct _Jbig2Image Jbig2Image;

/* private structures */
typedef struct _Jbig2Page Jbig2Page;
typedef struct _Jbig2SymbolDictionary Jbig2SymbolDictionary;

/*
   this is the general image structure used by the jbig2dec library
   images are 1 bpp, packed into rows a byte at a time. stride gives
   the byte offset to the next row, while width and height define
   the size of the image area in pixels.
*/

struct _Jbig2Image {
        int             width, height, stride;
        uint8_t        *data;
	int		refcount;
};

Jbig2Image*     jbig2_image_new(Jbig2Ctx *ctx, int width, int height);
Jbig2Image*	jbig2_image_clone(Jbig2Ctx *ctx, Jbig2Image *image);
void		jbig2_image_release(Jbig2Ctx *ctx, Jbig2Image *image);
void            jbig2_image_free(Jbig2Ctx *ctx, Jbig2Image *image);
void		jbig2_image_clear(Jbig2Ctx *ctx, Jbig2Image *image, int value);
Jbig2Image	*jbig2_image_resize(Jbig2Ctx *ctx, Jbig2Image *image,
                                int width, int height);

/* errors are returned from the library via a callback. If no callback
   is provided (a NULL argument is passed ot jbig2_ctx_new) a default
   handler is used which prints fatal errors to the stderr stream. */

/* error callback */
typedef int (*Jbig2ErrorCallback) (void *data,
				  const char *msg, Jbig2Severity severity,
				  int32_t seg_idx);

/* memory allocation is likewise done via a set of callbacks so that
   clients can better control memory usage. If a NULL is passed for
   this argumennt of jbig2_ctx_new, a default allocator based on malloc()
   is used. */

/* dynamic memory callbacks */
struct _Jbig2Allocator {
  void *(*alloc) (Jbig2Allocator *allocator, size_t size);
  void (*free) (Jbig2Allocator *allocator, void *p);
  void *(*realloc) (Jbig2Allocator *allocator, void *p, size_t size);
};

/* decoder context */
Jbig2Ctx *jbig2_ctx_new (Jbig2Allocator *allocator,
			 Jbig2Options options,
			 Jbig2GlobalCtx *global_ctx,
			 Jbig2ErrorCallback error_callback,
			 void *error_callback_data);
void jbig2_ctx_free (Jbig2Ctx *ctx);

/* global context for embedded streams */
Jbig2GlobalCtx *jbig2_make_global_ctx (Jbig2Ctx *ctx);
void jbig2_global_ctx_free (Jbig2GlobalCtx *global_ctx);

/* submit data to the decoder */
int jbig2_data_in (Jbig2Ctx *ctx, const unsigned char *data, size_t size);

/* get the next available decoded page image. NULL means there isn't one. */
Jbig2Image *jbig2_page_out (Jbig2Ctx *ctx);
/* mark a returned page image as no longer needed. */
int jbig2_release_page (Jbig2Ctx *ctx, Jbig2Image *image);
/* mark the current page as complete, simulating an end-of-page segment (for broken streams) */
int jbig2_complete_page (Jbig2Ctx *ctx);


/* segment header routines */

struct _Jbig2Segment {
  uint32_t number;
  uint8_t flags;
  uint32_t page_association;
  size_t data_length;
  int referred_to_segment_count;
  uint32_t *referred_to_segments;
  void *result;
};

Jbig2Segment *jbig2_parse_segment_header (Jbig2Ctx *ctx, uint8_t *buf, size_t buf_size,
			    size_t *p_header_size);
int jbig2_parse_segment (Jbig2Ctx *ctx, Jbig2Segment *segment,
			 const uint8_t *segment_data);
void jbig2_free_segment (Jbig2Ctx *ctx, Jbig2Segment *segment);

Jbig2Segment *jbig2_find_segment(Jbig2Ctx *ctx, uint32_t number);

#endif /* _JBIG2_H */

#ifdef __cplusplus
}
#endif