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| Rev | Author | Line No. | Line |
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| 4680 | right-hear | 1 | #include "fitz.h" |
| 2 | |||
| 3 | #ifdef _WIN32 /* Microsoft Visual C++ */ |
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| 4 | |||
| 5 | typedef signed char int8_t; |
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| 6 | typedef short int int16_t; |
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| 7 | typedef int int32_t; |
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| 8 | typedef __int64 int64_t; |
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| 9 | |||
| 10 | typedef unsigned char uint8_t; |
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| 11 | typedef unsigned short int uint16_t; |
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| 12 | typedef unsigned int uint32_t; |
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| 13 | |||
| 14 | #else |
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| 15 | #include |
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| 16 | #endif |
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| 17 | |||
| 18 | #include |
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| 19 | |||
| 20 | typedef struct fz_jbig2d_s fz_jbig2d; |
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| 21 | |||
| 22 | struct fz_jbig2d_s |
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| 23 | { |
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| 24 | fz_stream *chain; |
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| 25 | Jbig2Ctx *ctx; |
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| 26 | Jbig2GlobalCtx *gctx; |
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| 27 | Jbig2Image *page; |
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| 28 | int idx; |
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| 29 | }; |
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| 30 | |||
| 31 | static void |
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| 32 | close_jbig2d(fz_stream *stm) |
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| 33 | { |
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| 34 | fz_jbig2d *state = stm->state; |
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| 35 | if (state->page) |
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| 36 | jbig2_release_page(state->ctx, state->page); |
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| 37 | if (state->gctx) |
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| 38 | jbig2_global_ctx_free(state->gctx); |
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| 39 | jbig2_ctx_free(state->ctx); |
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| 40 | fz_close(state->chain); |
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| 41 | fz_free(state); |
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| 42 | } |
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| 43 | |||
| 44 | static int |
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| 45 | read_jbig2d(fz_stream *stm, unsigned char *buf, int len) |
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| 46 | { |
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| 47 | fz_jbig2d *state = stm->state; |
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| 48 | unsigned char tmp[4096]; |
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| 49 | unsigned char *p = buf; |
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| 50 | unsigned char *ep = buf + len; |
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| 51 | unsigned char *s; |
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| 52 | int x, w, n; |
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| 53 | |||
| 54 | if (!state->page) |
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| 55 | { |
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| 56 | while (1) |
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| 57 | { |
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| 58 | n = fz_read(state->chain, tmp, sizeof tmp); |
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| 59 | if (n < 0) |
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| 60 | return fz_rethrow(n, "read error in jbig2 filter"); |
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| 61 | if (n == 0) |
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| 62 | break; |
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| 63 | jbig2_data_in(state->ctx, tmp, n); |
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| 64 | } |
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| 65 | |||
| 66 | jbig2_complete_page(state->ctx); |
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| 67 | |||
| 68 | state->page = jbig2_page_out(state->ctx); |
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| 69 | if (!state->page) |
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| 70 | return fz_throw("jbig2_page_out failed"); |
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| 71 | } |
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| 72 | |||
| 73 | s = state->page->data; |
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| 74 | w = state->page->height * state->page->stride; |
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| 75 | x = state->idx; |
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| 76 | while (p < ep && x < w) |
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| 77 | *p++ = s[x++] ^ 0xff; |
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| 78 | state->idx = x; |
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| 79 | |||
| 80 | return p - buf; |
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| 81 | } |
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| 82 | |||
| 83 | fz_stream * |
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| 84 | fz_open_jbig2d(fz_stream *chain, fz_buffer *globals) |
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| 85 | { |
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| 86 | fz_jbig2d *state; |
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| 87 | |||
| 88 | state = fz_malloc(sizeof(fz_jbig2d)); |
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| 89 | state->chain = chain; |
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| 90 | state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, NULL, NULL, NULL); |
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| 91 | state->gctx = NULL; |
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| 92 | state->page = NULL; |
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| 93 | state->idx = 0; |
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| 94 | |||
| 95 | if (globals) |
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| 96 | { |
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| 97 | jbig2_data_in(state->ctx, globals->data, globals->len); |
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| 98 | state->gctx = jbig2_make_global_ctx(state->ctx); |
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| 99 | state->ctx = jbig2_ctx_new(NULL, JBIG2_OPTIONS_EMBEDDED, state->gctx, NULL, NULL); |
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| 100 | } |
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| 101 | |||
| 102 | return fz_new_stream(state, read_jbig2d, close_jbig2d); |
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| 103 | } |