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Implement reading an uncompressed collective symbol bitmap.


git-svn-id: http://svn.ghostscript.com/jbig2dec/trunk@427 ded80894-8fb9-0310-811b-c03f3676ab4d

--- a/jbig2_symbol_dict.c

+++ b/jbig2_symbol_dict.c

@@ -475,7 +475,6 @@

       /* 6.5.5 (4d) */

       if (params->SDHUFF && !params->SDREFAGG) {

 	/* 6.5.9 */

-	Jbig2GenericRegionParams rparams;

 	Jbig2Image *image;

 	int BMSIZE = jbig2_huffman_get(hs, params->SDHUFFBMSIZE, &code);

 	if (code || (BMSIZE < 0)) {

@@ -492,23 +491,30 @@

 	  /* todo: memory cleanup */

 	  return NULL;

 	}

-	/* todo: if BMSIZE == 0 bitmap is uncompressed */

-	if (BMSIZE == 0) {

-	  jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

-	    "uncompressed collective bitmap NYI!");

-	  return NULL;

-	}

 	jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,

-	  "reading %dx%d collective bitmap for %d symbols"

-	  " (%d bytes at data offset %d)",

+	  "reading %dx%d collective bitmap for %d symbols (%d bytes)",

 	  image->width, image->height, NSYMSDECODED - HCFIRSTSYM,

-	  BMSIZE, jbig2_huffman_offset(hs));

-	rparams.MMR = 1;

-	code = jbig2_decode_generic_mmr(ctx, segment, &rparams,

+	  BMSIZE);

+	if (BMSIZE == 0) {

+	  /* if BMSIZE == 0 bitmap is uncompressed */

+	  const byte *src = data + jbig2_huffman_offset(hs);

+	  const int stride = (image->width >> 3) + 

+		(image->width & 7) ? 1 : 0;

+	  byte *dst = image->data;

+	  int j;

+	  for (j = 0; j < image->height; j++) {

+	    memcpy(dst, src, stride);

+	    dst += image->stride;

+	    src += stride;

+	  }

+	  BMSIZE = image->height * stride;

+	} else {

+	  Jbig2GenericRegionParams rparams;

+	  rparams.MMR = 1;

+	  code = jbig2_decode_generic_mmr(ctx, segment, &rparams,

 	    data + jbig2_huffman_offset(hs), BMSIZE, image);

-#ifdef OUTPUT_PBM

-        jbig2_image_write_pbm_file(image, "collective.pbm");

-#endif

+	}

+	/* advance past the data we've just read */

 	jbig2_huffman_advance(hs, BMSIZE);

       }