427 lines
11 KiB
C
427 lines
11 KiB
C
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#include "mupdf/fitz.h"
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#ifdef HAVE_LURATECH
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#include <string.h>
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#include <ldf_jb2.h>
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struct info
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{
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fz_context *ctx;
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unsigned long width, height;
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unsigned long xres, yres;
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unsigned long stride;
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unsigned long pages;
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fz_colorspace *cspace;
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JB2_Handle_Document doc;
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const unsigned char *data;
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size_t len;
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unsigned char *output;
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};
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static void * JB2_Callback
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jbig2_alloc(unsigned long size, void *userdata)
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{
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struct info *state = userdata;
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return fz_malloc(state->ctx, size);
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}
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static JB2_Error JB2_Callback
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jbig2_free(void *ptr, void *userdata)
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{
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struct info *state = userdata;
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fz_free(state->ctx, ptr);
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return cJB2_Error_OK;
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}
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static void JB2_Callback
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jbig2_message(const char *msg, JB2_Message_Level level, void *userdata)
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{
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struct info *state = userdata;
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if (msg != NULL && msg[0] != '\0')
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switch (level)
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{
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case cJB2_Message_Information:
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#ifndef NDEBUG
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fz_warn(state->ctx, "luratech jbig2 info: %s", msg);
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#endif
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break;
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case cJB2_Message_Warning:
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fz_warn(state->ctx, "luratech jbig2 warning: %s", msg);
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break;
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case cJB2_Message_Error:
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fz_warn(state->ctx, "luratech jbig2 error: %s", msg);
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break;
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default:
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fz_warn(state->ctx, "luratech jbig2 message: %s", msg);
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break;
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}
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}
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static JB2_Size_T JB2_Callback
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jbig2_read(unsigned char *buf, JB2_Size_T offset, JB2_Size_T size, void *userdata)
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{
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struct info *state = userdata;
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size_t available;
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if (state->len <= offset)
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return 0;
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available = fz_minz(state->len - offset, size);
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memcpy(buf, state->data + offset, available);
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return (JB2_Size_T)available;
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}
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static JB2_Error JB2_Callback
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jbig2_write(unsigned char *buf, unsigned long row, unsigned long width, unsigned long bpp, void *userdata)
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{
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struct info *state = userdata;
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int stride = (width + 7) >> 3;
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unsigned char *dp = state->output + row * stride;
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if (row >= state->height)
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{
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fz_warn(state->ctx, "row %lu outside of image", row);
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return cJB2_Error_OK;
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}
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while (stride--)
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*(dp++) = *(buf++) ^ 0xff;
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return cJB2_Error_OK;
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}
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static fz_pixmap *
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jbig2_read_image(fz_context *ctx, struct info *jbig2, const unsigned char *buf, size_t len, int only_metadata, int subimage)
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{
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struct info *state = jbig2;
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JB2_Error err;
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JB2_Scaling_Factor scale = {1, 1};
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JB2_Rect rect = {0, 0, 0, 0};
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fz_pixmap *pix = NULL;
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fz_var(pix);
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fz_try(ctx)
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{
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state->ctx = ctx;
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state->data = buf;
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state->len = len;
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err = JB2_Document_Start(&state->doc,
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jbig2_alloc, state,
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jbig2_free, state,
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jbig2_read, state,
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jbig2_message, state);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open image: %d", (int) err);
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#if defined(JB2_LICENSE_NUM_1) && defined(JB2_LICENSE_NUM_2)
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err = JB2_Document_Set_License(doc, JB2_LICENSE_NUM_1, JB2_LICENSE_NUM_2);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot set license: %d", (int) err);
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#endif
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err = JB2_Document_Get_Property(state->doc, cJB2_Prop_Number_Of_Pages, &state->pages);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot get number of pages: %d", (int) err);
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if (subimage != -1)
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{
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if (subimage < 0 || (unsigned long) subimage >= state->pages)
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fz_throw(ctx, FZ_ERROR_GENERIC, "page number out of bounds %d vs %ld", subimage, state->pages);
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err = JB2_Document_Set_Page(state->doc, subimage);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot select page: %d", (int) err);
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}
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err = JB2_Document_Get_Property(state->doc, cJB2_Prop_Page_Resolution_X, &state->xres);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot get page x resolution: %d", (int) err);
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err = JB2_Document_Get_Property(state->doc, cJB2_Prop_Page_Resolution_Y, &state->yres);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot get page y resolution: %d", (int) err);
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err = JB2_Document_Get_Property(state->doc, cJB2_Prop_Page_Width, &state->width);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot get page width: %d", (int) err);
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err = JB2_Document_Get_Property(state->doc, cJB2_Prop_Page_Height, &state->height);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot get page height: %d", (int) err);
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if (!only_metadata)
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{
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state->stride = (state->width + 7) >> 3;
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state->output = fz_malloc(state->ctx, state->stride * state->height);
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err = JB2_Document_Decompress_Page(state->doc, scale, rect, jbig2_write, state);
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if (err != cJB2_Error_OK)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot decode image: %d", (int) err);
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pix = fz_new_pixmap(ctx, fz_device_gray(ctx), state->width, state->height, NULL, 0);
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fz_unpack_tile(ctx, pix, state->output, 1, 1, state->stride, 0);
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}
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}
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fz_always(ctx)
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{
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JB2_Document_End(&state->doc);
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}
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fz_catch(ctx)
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{
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fz_drop_pixmap(ctx, pix);
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fz_rethrow(ctx);
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}
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return pix;
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}
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int
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fz_load_jbig2_subimage_count(fz_context *ctx, const unsigned char *buf, size_t len)
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{
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struct info jbig2 = { 0 };
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int subimage_count = 0;
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fz_try(ctx)
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{
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jbig2_read_image(ctx, &jbig2, buf, len, 1, -1);
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subimage_count = jbig2.pages;
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}
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fz_catch(ctx)
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fz_rethrow(ctx);
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return subimage_count;
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}
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void
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fz_load_jbig2_info_subimage(fz_context *ctx, const unsigned char *buf, size_t len, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep, int subimage)
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{
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struct info jbig2 = { 0 };
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jbig2_read_image(ctx, &jbig2, buf, len, 1, subimage);
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*cspacep = fz_keep_colorspace(ctx, jbig2.cspace);
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*wp = jbig2.width;
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*hp = jbig2.height;
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*xresp = jbig2.xres;
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*yresp = jbig2.yres;
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}
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fz_pixmap *
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fz_load_jbig2_subimage(fz_context *ctx, const unsigned char *buf, size_t len, int subimage)
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{
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struct info jbig2 = { 0 };
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return jbig2_read_image(ctx, &jbig2, buf, len, 0, subimage);
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}
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fz_pixmap *
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fz_load_jbig2(fz_context *ctx, const unsigned char *buf, size_t len)
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{
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return fz_load_jbig2_subimage(ctx, buf, len, 0);
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}
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void
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fz_load_jbig2_info(fz_context *ctx, const unsigned char *buf, size_t len, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep)
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{
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fz_load_jbig2_info_subimage(ctx, buf, len, wp, hp, xresp, yresp, cspacep, 0);
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}
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#else /* HAVE_LURATECH */
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#include <jbig2.h>
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struct info
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{
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int width, height;
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int xres, yres;
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int pages;
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fz_colorspace *cspace;
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};
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struct fz_jbig2_alloc_s
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{
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Jbig2Allocator super;
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fz_context *ctx;
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};
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static void
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error_callback(void *data, const char *msg, Jbig2Severity severity, int32_t seg_idx)
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{
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fz_context *ctx = data;
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if (severity == JBIG2_SEVERITY_FATAL)
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fz_warn(ctx, "jbig2dec error: %s (segment %d)", msg, seg_idx);
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else if (severity == JBIG2_SEVERITY_WARNING)
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fz_warn(ctx, "jbig2dec warning: %s (segment %d)", msg, seg_idx);
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#ifndef NDEBUG
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else if (severity == JBIG2_SEVERITY_INFO)
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fz_warn(ctx, "jbig2dec info: %s (segment %d)", msg, seg_idx);
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else if (severity == JBIG2_SEVERITY_DEBUG)
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fz_warn(ctx, "jbig2dec debug: %s (segment %d)", msg, seg_idx);
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#endif
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}
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static void *fz_jbig2_alloc(Jbig2Allocator *allocator, size_t size)
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{
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fz_context *ctx = ((struct fz_jbig2_alloc_s *) allocator)->ctx;
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return fz_malloc_no_throw(ctx, size);
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}
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static void fz_jbig2_free(Jbig2Allocator *allocator, void *p)
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{
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fz_context *ctx = ((struct fz_jbig2_alloc_s *) allocator)->ctx;
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fz_free(ctx, p);
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}
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static void *fz_jbig2_realloc(Jbig2Allocator *allocator, void *p, size_t size)
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{
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fz_context *ctx = ((struct fz_jbig2_alloc_s *) allocator)->ctx;
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if (size == 0)
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{
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fz_free(ctx, p);
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return NULL;
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}
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if (p == NULL)
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return fz_malloc(ctx, size);
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return fz_realloc_no_throw(ctx, p, size);
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}
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static fz_pixmap *
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jbig2_read_image(fz_context *ctx, struct info *jbig2, const unsigned char *buf, size_t len, int only_metadata, int subimage)
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{
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Jbig2Ctx *jctx = NULL;
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Jbig2Image *page = NULL;
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struct fz_jbig2_alloc_s allocator;
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fz_pixmap *pix = NULL;
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allocator.super.alloc = fz_jbig2_alloc;
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allocator.super.free = fz_jbig2_free;
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allocator.super.realloc = fz_jbig2_realloc;
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allocator.ctx = ctx;
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fz_var(jctx);
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fz_var(page);
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fz_var(pix);
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fz_try(ctx)
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{
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jctx = jbig2_ctx_new((Jbig2Allocator *) &allocator, 0, NULL, error_callback, ctx);
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if (jctx == NULL)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot create jbig2 context");
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if (jbig2_data_in(jctx, buf, len) < 0)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot decode jbig2 image");
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if (jbig2_complete_page(jctx) < 0)
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fz_throw(ctx, FZ_ERROR_GENERIC, "cannot complete jbig2 image");
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if (only_metadata && subimage < 0)
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{
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while ((page = jbig2_page_out(jctx)) != NULL)
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{
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jbig2_release_page(jctx, page);
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jbig2->pages++;
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}
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}
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else if (only_metadata && subimage >= 0)
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{
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while ((page = jbig2_page_out(jctx)) != NULL && subimage > 0)
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{
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jbig2_release_page(jctx, page);
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subimage--;
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}
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if (page == NULL)
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fz_throw(ctx, FZ_ERROR_GENERIC, "no jbig2 image decoded");
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jbig2->cspace = fz_device_gray(ctx);
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jbig2->width = page->width;
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jbig2->height = page->height;
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jbig2->xres = 72;
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jbig2->yres = 72;
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}
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else if (subimage >= 0)
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{
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while ((page = jbig2_page_out(jctx)) != NULL && subimage > 0)
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{
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jbig2_release_page(jctx, page);
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subimage--;
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}
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if (page == NULL)
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fz_throw(ctx, FZ_ERROR_GENERIC, "no jbig2 image decoded");
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jbig2->cspace = fz_device_gray(ctx);
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||
|
|
jbig2->width = page->width;
|
||
|
|
jbig2->height = page->height;
|
||
|
|
jbig2->xres = 72;
|
||
|
|
jbig2->yres = 72;
|
||
|
|
|
||
|
|
pix = fz_new_pixmap(ctx, jbig2->cspace, jbig2->width, jbig2->height, NULL, 0);
|
||
|
|
fz_unpack_tile(ctx, pix, page->data, 1, 1, page->stride, 0);
|
||
|
|
fz_invert_pixmap(ctx, pix);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
fz_always(ctx)
|
||
|
|
{
|
||
|
|
jbig2_release_page(jctx, page);
|
||
|
|
jbig2_ctx_free(jctx);
|
||
|
|
}
|
||
|
|
fz_catch(ctx)
|
||
|
|
{
|
||
|
|
fz_drop_pixmap(ctx, pix);
|
||
|
|
fz_rethrow(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
return pix;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
fz_load_jbig2_subimage_count(fz_context *ctx, const unsigned char *buf, size_t len)
|
||
|
|
{
|
||
|
|
struct info jbig2 = { 0 };
|
||
|
|
int subimage_count = 0;
|
||
|
|
|
||
|
|
fz_try(ctx)
|
||
|
|
{
|
||
|
|
jbig2_read_image(ctx, &jbig2, buf, len, 1, -1);
|
||
|
|
subimage_count = jbig2.pages;
|
||
|
|
}
|
||
|
|
fz_catch(ctx)
|
||
|
|
fz_rethrow(ctx);
|
||
|
|
|
||
|
|
return subimage_count;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
fz_load_jbig2_info_subimage(fz_context *ctx, const unsigned char *buf, size_t len, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep, int subimage)
|
||
|
|
{
|
||
|
|
struct info jbig2 = { 0 };
|
||
|
|
|
||
|
|
jbig2_read_image(ctx, &jbig2, buf, len, 1, subimage);
|
||
|
|
*cspacep = fz_keep_colorspace(ctx, jbig2.cspace);
|
||
|
|
*wp = jbig2.width;
|
||
|
|
*hp = jbig2.height;
|
||
|
|
*xresp = jbig2.xres;
|
||
|
|
*yresp = jbig2.yres;
|
||
|
|
}
|
||
|
|
|
||
|
|
fz_pixmap *
|
||
|
|
fz_load_jbig2_subimage(fz_context *ctx, const unsigned char *buf, size_t len, int subimage)
|
||
|
|
{
|
||
|
|
struct info jbig2 = { 0 };
|
||
|
|
return jbig2_read_image(ctx, &jbig2, buf, len, 0, subimage);
|
||
|
|
}
|
||
|
|
|
||
|
|
fz_pixmap *
|
||
|
|
fz_load_jbig2(fz_context *ctx, const unsigned char *buf, size_t len)
|
||
|
|
{
|
||
|
|
return fz_load_jbig2_subimage(ctx, buf, len, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
fz_load_jbig2_info(fz_context *ctx, const unsigned char *buf, size_t len, int *wp, int *hp, int *xresp, int *yresp, fz_colorspace **cspacep)
|
||
|
|
{
|
||
|
|
fz_load_jbig2_info_subimage(ctx, buf, len, wp, hp, xresp, yresp, cspacep, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* HAVE_LURATECH */
|