104 lines
2.0 KiB
C
104 lines
2.0 KiB
C
#include "fitz.h"
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#ifdef _WIN32 /* Microsoft Visual C++ */
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typedef signed char int8_t;
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typedef short int int16_t;
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typedef int int32_t;
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typedef __int64 int64_t;
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typedef unsigned char uint8_t;
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typedef unsigned short int uint16_t;
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typedef unsigned int uint32_t;
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#else
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#include <inttypes.h>
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#endif
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#include <jbig2.h>
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typedef struct fz_jbig2d_s fz_jbig2d;
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struct fz_jbig2d_s
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{
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fz_stream *chain;
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Jbig2Ctx *ctx;
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Jbig2GlobalCtx *gctx;
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Jbig2Image *page;
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int idx;
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};
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static void
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close_jbig2d(fz_stream *stm)
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{
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fz_jbig2d *state = stm->state;
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if (state->page)
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jbig2_release_page(state->ctx, state->page);
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if (state->gctx)
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jbig2_global_ctx_free(state->gctx);
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jbig2_ctx_free(state->ctx);
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fz_close(state->chain);
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fz_free(state);
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}
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static int
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read_jbig2d(fz_stream *stm, unsigned char *buf, int len)
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{
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fz_jbig2d *state = stm->state;
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unsigned char tmp[4096];
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unsigned char *p = buf;
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unsigned char *ep = buf + len;
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unsigned char *s;
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int x, w, n;
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if (!state->page)
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{
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while (1)
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{
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n = fz_read(state->chain, tmp, sizeof tmp);
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if (n < 0)
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return fz_rethrow(n, "read error in jbig2 filter");
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if (n == 0)
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break;
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jbig2_data_in(state->ctx, tmp, n);
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}
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jbig2_complete_page(state->ctx);
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state->page = jbig2_page_out(state->ctx);
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if (!state->page)
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return fz_throw("jbig2_page_out failed");
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}
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s = state->page->data;
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w = state->page->height * state->page->stride;
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x = state->idx;
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while (p < ep && x < w)
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*p++ = s[x++] ^ 0xff;
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state->idx = x;
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return p - buf;
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}
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fz_stream *
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fz_open_jbig2d(fz_stream *chain, fz_buffer *globals)
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{
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fz_jbig2d *state;
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state = fz_malloc(sizeof(fz_jbig2d));
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state->chain = chain;
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state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, NULL, NULL, NULL);
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state->gctx = NULL;
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state->page = NULL;
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state->idx = 0;
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if (globals)
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{
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jbig2_data_in(state->ctx, globals->data, globals->len);
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state->gctx = jbig2_make_global_ctx(state->ctx);
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state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, state->gctx, NULL, NULL);
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}
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return fz_new_stream(state, read_jbig2d, close_jbig2d);
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}
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