ref: 5c9498154bb7e722777fcda2294b31535ef06e08
dir: /jbig2_priv.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_priv.h,v 1.16 2002/08/05 22:47:53 giles Exp $ shared library internals */ typedef uint8_t byte; typedef int bool; #ifndef TRUE #define TRUE 1 #endif #ifndef FALSE #define FALSE 0 #endif #ifndef NULL #define NULL ((void*)0) #endif typedef enum { JBIG2_FILE_HEADER, JBIG2_FILE_SEQUENTIAL_HEADER, JBIG2_FILE_SEQUENTIAL_BODY, JBIG2_FILE_RANDOM_HEADERS, JBIG2_FILE_RANDOM_BODIES, JBIG2_FILE_EOF } Jbig2FileState; struct _Jbig2Ctx { Jbig2Allocator *allocator; Jbig2Options options; const Jbig2Ctx *global_ctx; Jbig2ErrorCallback error_callback; void *error_callback_data; byte *buf; size_t buf_size; unsigned int buf_rd_ix; unsigned int buf_wr_ix; Jbig2FileState state; byte file_header_flags; int32_t n_pages; int n_segments_max; Jbig2Segment **segments; int n_segments; /* index of last segment header parsed */ int segment_index; /* index of last segment body parsed */ /* list of decoded pages, including the one in progress, currently stored as a contiguous, 0-indexed array. */ int current_page; int max_page_index; Jbig2Page *pages; }; int32_t jbig2_get_int32 (const byte *buf); int16_t jbig2_get_int16 (const byte *buf); /* dynamic memory management */ void * jbig2_alloc (Jbig2Allocator *allocator, size_t size); void jbig2_free (Jbig2Allocator *allocator, void *p); void * jbig2_realloc (Jbig2Allocator *allocator, void *p, size_t size); #define jbig2_new(ctx, t, size) ((t *)jbig2_alloc(ctx->allocator, (size) * sizeof(t))) #define jbig2_renew(ctx, p, t, size) ((t *)jbig2_realloc(ctx->allocator, (p), (size) * sizeof(t))) int jbig2_error (Jbig2Ctx *ctx, Jbig2Severity severity, int32_t seg_idx, const char *fmt, ...); /* the page structure handles decoded page results. it's allocated by a 'page info' segement and marked complete by an 'end of page' segment. */ typedef enum { JBIG2_PAGE_FREE, JBIG2_PAGE_NEW, JBIG2_PAGE_COMPLETE, JBIG2_PAGE_RETURNED, JBIG2_PAGE_RELEASED } Jbig2PageState; struct _Jbig2Page { Jbig2PageState state; uint32_t number; uint32_t height, width; /* in pixels */ uint32_t x_resolution, y_resolution; /* in pixels per meter */ uint16_t stripe_size; bool striped; uint8_t flags; Jbig2Image *image; }; int jbig2_parse_page_info (Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data); int jbig2_parse_end_of_page(Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data); typedef enum { JBIG2_COMPOSE_OR = 0, JBIG2_COMPOSE_AND = 1, JBIG2_COMPOSE_XOR = 2, JBIG2_COMPOSE_XNOR = 3 } Jbig2ComposeOp; int jbig2_image_compose(Jbig2Ctx *ctx, Jbig2Image *dst, Jbig2Image *src, int x, int y, Jbig2ComposeOp op); /* region segment info */ typedef struct { int32_t width; int32_t height; int32_t x; int32_t y; byte flags; } Jbig2RegionSegmentInfo; void jbig2_get_region_segment_info(Jbig2RegionSegmentInfo *info, const byte *segment_data); int jbig2_parse_text_region(Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data); /* 7.4 */ int jbig2_immediate_generic_region(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data); /* The word stream design is a compromise between simplicity and trying to amortize the number of method calls. Each ::get_next_word invocation pulls 4 bytes from the stream, packed big-endian into a 32 bit word. The offset argument is provided as a convenience. It begins at 0 and increments by 4 for each successive invocation. */ typedef struct _Jbig2WordStream Jbig2WordStream; struct _Jbig2WordStream { uint32_t (*get_next_word) (Jbig2WordStream *self, int offset); }; Jbig2WordStream * jbig2_word_stream_buf_new(Jbig2Ctx *ctx, const byte *data, size_t size); void jbig2_word_stream_buf_free(Jbig2Ctx *ctx, Jbig2WordStream *ws);