=== modified file 'src/book.vala'
--- src/book.vala	2011-11-09 00:29:48 +0000
+++ src/book.vala	2012-02-29 12:22:16 +0000
@@ -295,6 +295,7 @@
                 depth = 2;
                 color_space = "DeviceGray";
                 var data_length = height * ((width * 2 + 7) / 8);
+stderr.printf("allocated: data_length = %d, height = %d, width = %d\n", data_length, height, width);
                 data = new uint8[data_length];
                 var offset = 0;
                 data[offset] = 0;
@@ -304,6 +305,7 @@
                     if (shift_count != 6)
                     {
                         offset++;
+if (offset >= data_length) stderr.printf("next line: offset %d >= data_length %d\n", offset, data_length);
                         data[offset] = 0;
                         shift_count = 6;
                     }
@@ -312,6 +314,7 @@
                     for (var x = 0; x < width; x++)
                     {
                         var p = pixels[in_offset + x*3];
+if (offset >= data_length) stderr.printf("pixels: offset %d >= data_length %d\n", offset, data_length);
                         if (p >= 192)
                             data[offset] |= 3 << shift_count;
                         else if (p >= 128)
@@ -321,6 +324,7 @@
                         if (shift_count == 0)
                         {
                             offset++;
+if (offset >= data_length) stderr.printf("shift_count: offset %d >= data_length %d (x = %d, width = %d)\n", offset, data_length, x, width);
                             data[offset] = 0;
                             shift_count = 6;
                         }