| 0,0 → 1,103 |
|---|
| #include "fitz.h" |
| |
| #ifdef _WIN32 /* Microsoft Visual C++ */ |
| |
| typedef signed char int8_t; |
| typedef short int int16_t; |
| typedef int int32_t; |
| typedef __int64 int64_t; |
| |
| typedef unsigned char uint8_t; |
| typedef unsigned short int uint16_t; |
| typedef unsigned int uint32_t; |
| |
| #else |
| #include <inttypes.h> |
| #endif |
| |
| #include <jbig2.h> |
| |
| typedef struct fz_jbig2d_s fz_jbig2d; |
| |
| struct fz_jbig2d_s |
| { |
| fz_stream *chain; |
| Jbig2Ctx *ctx; |
| Jbig2GlobalCtx *gctx; |
| Jbig2Image *page; |
| int idx; |
| }; |
| |
| static void |
| close_jbig2d(fz_stream *stm) |
| { |
| fz_jbig2d *state = stm->state; |
| if (state->page) |
| jbig2_release_page(state->ctx, state->page); |
| if (state->gctx) |
| jbig2_global_ctx_free(state->gctx); |
| jbig2_ctx_free(state->ctx); |
| fz_close(state->chain); |
| fz_free(state); |
| } |
| |
| static int |
| read_jbig2d(fz_stream *stm, unsigned char *buf, int len) |
| { |
| fz_jbig2d *state = stm->state; |
| unsigned char tmp[4096]; |
| unsigned char *p = buf; |
| unsigned char *ep = buf + len; |
| unsigned char *s; |
| int x, w, n; |
| |
| if (!state->page) |
| { |
| while (1) |
| { |
| n = fz_read(state->chain, tmp, sizeof tmp); |
| if (n < 0) |
| return fz_rethrow(n, "read error in jbig2 filter"); |
| if (n == 0) |
| break; |
| jbig2_data_in(state->ctx, tmp, n); |
| } |
| |
| jbig2_complete_page(state->ctx); |
| |
| state->page = jbig2_page_out(state->ctx); |
| if (!state->page) |
| return fz_throw("jbig2_page_out failed"); |
| } |
| |
| s = state->page->data; |
| w = state->page->height * state->page->stride; |
| x = state->idx; |
| while (p < ep && x < w) |
| *p++ = s[x++] ^ 0xff; |
| state->idx = x; |
| |
| return p - buf; |
| } |
| |
| fz_stream * |
| fz_open_jbig2d(fz_stream *chain, fz_buffer *globals) |
| { |
| fz_jbig2d *state; |
| |
| state = fz_malloc(sizeof(fz_jbig2d)); |
| state->chain = chain; |
| state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, NULL, NULL, NULL); |
| state->gctx = NULL; |
| state->page = NULL; |
| state->idx = 0; |
| |
| if (globals) |
| { |
| jbig2_data_in(state->ctx, globals->data, globals->len); |
| state->gctx = jbig2_make_global_ctx(state->ctx); |
| state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, state->gctx, NULL, NULL); |
| } |
| |
| return fz_new_stream(state, read_jbig2d, close_jbig2d); |
| } |