Fix some compressed stream bugs.

pdfio-common.c

@@ -80,6 +80,8 @@ _pdfioFileError(pdfio_file_t *pdf,	// I - PDF file
   vsnprintf(buffer, sizeof(buffer), format, ap);
   va_end(ap);
 
+  PDFIO_DEBUG("_pdfioFileError: %s\n", buffer);
+
   return ((pdf->error_cb)(pdf, buffer, pdf->error_data));
 }
 

pdfio-file.c

@@ -1154,11 +1154,15 @@ load_xref(pdfio_file_t *pdf,		// I - PDF file
       return (false);
     }
 
+    do
+    {
       if (!_pdfioFileGets(pdf, line, sizeof(line)))
       {
 	_pdfioFileError(pdf, "Unable to read start of xref table.");
 	return (false);
       }
+    }
+    while (!line[0]);
 
     PDFIO_DEBUG("load_xref: xref_offset=%lu, line='%s'\n", (unsigned long)xref_offset, line);
 
@@ -1169,7 +1173,8 @@ load_xref(pdfio_file_t *pdf,		// I - PDF file
       size_t		i;		// Looping var
       pdfio_array_t	*index_array;	// Index array
       size_t		index_n,	// Current element in array
-			index_count;	// Number of values in index array
+			index_count,	// Number of values in index array
+			count;		// Number of objects in current pairing
       pdfio_array_t	*w_array;	// W array
       size_t		w[3];		// Size of each cross-reference field
       size_t		w_2,		// Offset to second field
@@ -1265,12 +1270,23 @@ load_xref(pdfio_file_t *pdf,		// I - PDF file
 	return (false);
       }
 
-      for (index_n = 0; index_n < index_count; index_n ++)
+      for (index_n = 0; index_n < index_count; index_n += 2)
+      {
+        if (index_count == 1)
+        {
+          number = 0;
+          count  = 999999999;
+	}
+	else
 	{
           number = (intmax_t)pdfioArrayGetNumber(index_array, index_n);
+          count  = (size_t)pdfioArrayGetNumber(index_array, index_n + 1);
+	}
 
-	while (pdfioStreamRead(st, buffer, w_total) > 0)
+	while (count > 0 && pdfioStreamRead(st, buffer, w_total) > 0)
 	{
+	  count --;
+
 	  PDFIO_DEBUG("load_xref: number=%u %02X%02X%02X%02X%02X\n", (unsigned)number, buffer[0], buffer[1], buffer[2], buffer[3], buffer[4]);
 
 	  // Check whether this is an object definition...
@@ -1371,6 +1387,8 @@ load_xref(pdfio_file_t *pdf,		// I - PDF file
       {
 	if (!strcmp(line, "trailer"))
 	  break;
+	else if (!line[0])
+	  continue;
 
 	if (sscanf(line, "%jd%jd", &number, &num_objects) != 2)
 	{

pdfio-stream.c

@@ -385,6 +385,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
       int predictor = (int)pdfioDictGetNumber(params, "Predictor");
 					// Predictory value, if any
       int status;			// ZLIB status
+      ssize_t rbytes;			// Bytes read
 
       PDFIO_DEBUG("_pdfioStreamOpen: FlateDecode - BitsPerComponent=%d, Colors=%d, Columns=%d, Predictor=%d\n", bpc, colors, columns, predictor);
 
@@ -450,8 +451,28 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
       else
         st->predictor = _PDFIO_PREDICTOR_NONE;
 
+      if (sizeof(st->cbuffer) > st->remaining)
+	rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->remaining);
+      else
+	rbytes = _pdfioFileRead(st->pdf, st->cbuffer, sizeof(st->cbuffer));
+
+      if (rbytes <= 0)
+      {
+	_pdfioFileError(st->pdf, "Unable to read bytes for stream.");
+	free(st->prbuffer);
+	free(st->psbuffer);
+	free(st);
+	return (NULL);
+      }
+
       st->flate.next_in  = (Bytef *)st->cbuffer;
-      st->flate.avail_in = (uInt)_pdfioFileRead(st->pdf, st->cbuffer, sizeof(st->cbuffer));
+      st->flate.avail_in = (uInt)rbytes;
+
+      if (st->cbuffer[0] == 0x0a)
+      {
+        st->flate.next_in ++;		// Skip newline
+        st->flate.avail_in --;
+      }
 
       PDFIO_DEBUG("_pdfioStreamOpen: avail_in=%u, cbuffer=<%02X%02X%02X%02X%02X%02X%02X%02X...>\n", st->flate.avail_in, st->cbuffer[0], st->cbuffer[1], st->cbuffer[2], st->cbuffer[3], st->cbuffer[4], st->cbuffer[5], st->cbuffer[6], st->cbuffer[7]);
 
@@ -989,7 +1010,11 @@ stream_read(pdfio_stream_t *st,		// I - Stream
       }
 
       if (st->flate.avail_out > 0)
-        return (-1);			// Early end of stream
+      {
+	// Early end of stream
+        PDFIO_DEBUG("stream_read: Early EOF (remaining=%u, avail_in=%d, avail_out=%d, data_type=%d, next_in=<%02X%02X%02X%02X...>).\n", (unsigned)st->remaining, st->flate.avail_in, st->flate.avail_out, st->flate.data_type, st->flate.next_in[0], st->flate.next_in[1], st->flate.next_in[2], st->flate.next_in[3]);
+        return (-1);
+      }
 
       // Apply predictor for this line
       PDFIO_DEBUG("stream_read: Line %02X %02X %02X %02X %02X.\n", sptr[-1], sptr[0], sptr[0], sptr[2], sptr[3]);