136 lines
4.2 KiB
C
136 lines
4.2 KiB
C
/*
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jbig2dec
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Copyright (C) 2002-2005 Artifex Software, Inc.
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This software is distributed under license and may not
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be copied, modified or distributed except as expressly
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authorized under the terms of the license contained in
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the file LICENSE in this distribution.
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For further licensing information refer to http://artifex.com/ or
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contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef _JBIG2_H
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#define _JBIG2_H
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/* warning levels */
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typedef enum {
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JBIG2_SEVERITY_DEBUG,
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JBIG2_SEVERITY_INFO,
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JBIG2_SEVERITY_WARNING,
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JBIG2_SEVERITY_FATAL
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} Jbig2Severity;
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typedef enum {
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JBIG2_OPTIONS_EMBEDDED = 1
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} Jbig2Options;
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/* forward public structure declarations */
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typedef struct _Jbig2Allocator Jbig2Allocator;
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typedef struct _Jbig2Ctx Jbig2Ctx;
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typedef struct _Jbig2GlobalCtx Jbig2GlobalCtx;
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typedef struct _Jbig2Segment Jbig2Segment;
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typedef struct _Jbig2Image Jbig2Image;
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/* private structures */
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typedef struct _Jbig2Page Jbig2Page;
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typedef struct _Jbig2SymbolDictionary Jbig2SymbolDictionary;
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/*
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this is the general image structure used by the jbig2dec library
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images are 1 bpp, packed into rows a byte at a time. stride gives
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the byte offset to the next row, while width and height define
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the size of the image area in pixels.
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*/
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struct _Jbig2Image {
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int width, height, stride;
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uint8_t *data;
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int refcount;
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};
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Jbig2Image* jbig2_image_new(Jbig2Ctx *ctx, int width, int height);
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Jbig2Image* jbig2_image_clone(Jbig2Ctx *ctx, Jbig2Image *image);
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void jbig2_image_release(Jbig2Ctx *ctx, Jbig2Image *image);
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void jbig2_image_free(Jbig2Ctx *ctx, Jbig2Image *image);
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void jbig2_image_clear(Jbig2Ctx *ctx, Jbig2Image *image, int value);
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Jbig2Image *jbig2_image_resize(Jbig2Ctx *ctx, Jbig2Image *image,
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int width, int height);
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/* errors are returned from the library via a callback. If no callback
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is provided (a NULL argument is passed ot jbig2_ctx_new) a default
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handler is used which prints fatal errors to the stderr stream. */
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/* error callback */
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typedef int (*Jbig2ErrorCallback) (void *data,
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const char *msg, Jbig2Severity severity,
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int32_t seg_idx);
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/* memory allocation is likewise done via a set of callbacks so that
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clients can better control memory usage. If a NULL is passed for
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this argumennt of jbig2_ctx_new, a default allocator based on malloc()
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is used. */
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/* dynamic memory callbacks */
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struct _Jbig2Allocator {
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void *(*alloc) (Jbig2Allocator *allocator, size_t size);
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void (*free) (Jbig2Allocator *allocator, void *p);
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void *(*realloc) (Jbig2Allocator *allocator, void *p, size_t size);
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};
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/* decoder context */
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Jbig2Ctx *jbig2_ctx_new (Jbig2Allocator *allocator,
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Jbig2Options options,
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Jbig2GlobalCtx *global_ctx,
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Jbig2ErrorCallback error_callback,
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void *error_callback_data);
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void jbig2_ctx_free (Jbig2Ctx *ctx);
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/* global context for embedded streams */
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Jbig2GlobalCtx *jbig2_make_global_ctx (Jbig2Ctx *ctx);
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void jbig2_global_ctx_free (Jbig2GlobalCtx *global_ctx);
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/* submit data to the decoder */
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int jbig2_data_in (Jbig2Ctx *ctx, const unsigned char *data, size_t size);
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/* get the next available decoded page image. NULL means there isn't one. */
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Jbig2Image *jbig2_page_out (Jbig2Ctx *ctx);
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/* mark a returned page image as no longer needed. */
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int jbig2_release_page (Jbig2Ctx *ctx, Jbig2Image *image);
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/* mark the current page as complete, simulating an end-of-page segment (for broken streams) */
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int jbig2_complete_page (Jbig2Ctx *ctx);
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/* segment header routines */
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struct _Jbig2Segment {
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uint32_t number;
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uint8_t flags;
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uint32_t page_association;
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size_t data_length;
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int referred_to_segment_count;
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uint32_t *referred_to_segments;
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void *result;
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};
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Jbig2Segment *jbig2_parse_segment_header (Jbig2Ctx *ctx, uint8_t *buf, size_t buf_size,
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size_t *p_header_size);
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int jbig2_parse_segment (Jbig2Ctx *ctx, Jbig2Segment *segment,
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const uint8_t *segment_data);
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void jbig2_free_segment (Jbig2Ctx *ctx, Jbig2Segment *segment);
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Jbig2Segment *jbig2_find_segment(Jbig2Ctx *ctx, uint32_t number);
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#endif /* _JBIG2_H */
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#ifdef __cplusplus
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}
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#endif
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