ref: 0797f658a74d280ca5bcec76ca932475d3b24be9
dir: /jbig2.h/
/*
jbig2dec
Copyright (c) 2002 artofcode LLC.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
$Id: jbig2.h,v 1.17 2003/03/05 14:29:35 giles Exp $
*/
#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;
};
Jbig2Image* jbig2_image_new(Jbig2Ctx *ctx, int width, int height);
void jbig2_image_free(Jbig2Ctx *ctx, Jbig2Image *image);
/* 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