Fix issues w/ partial img decompr + buf img mode
Fixes #611
diff --git a/ChangeLog.md b/ChangeLog.md
index 59ca516..b0d166e 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -23,6 +23,15 @@
interblock smoothing enabled. This was a regression introduced by
2.1 beta1[6(b)].
+5. Fixed two issues that prevented partial image decompression from working
+properly with buffered-image mode:
+
+ - Attempting to call `jpeg_crop_scanline()` after
+`jpeg_start_decompress()` but before `jpeg_start_output()` resulted in an error
+("Improper call to JPEG library in state 207".)
+ - Attempting to use `jpeg_skip_scanlines()` resulted in an error ("Bogus
+virtual array access") under certain circumstances.
+
2.1.3
=====
diff --git a/jdapistd.c b/jdapistd.c
index f9908a7..02cd0cb 100644
--- a/jdapistd.c
+++ b/jdapistd.c
@@ -163,7 +163,8 @@
my_master_ptr master = (my_master_ptr)cinfo->master;
#endif
- if (cinfo->global_state != DSTATE_SCANNING || cinfo->output_scanline != 0)
+ if ((cinfo->global_state != DSTATE_SCANNING &&
+ cinfo->global_state != DSTATE_BUFIMAGE) || cinfo->output_scanline != 0)
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
if (!xoffset || !width)
@@ -525,7 +526,7 @@
* all of the entropy decoding occurs in jpeg_start_decompress(), assuming
* that the input data source is non-suspending. This makes skipping easy.
*/
- if (cinfo->inputctl->has_multiple_scans) {
+ if (cinfo->inputctl->has_multiple_scans || cinfo->buffered_image) {
if (cinfo->upsample->need_context_rows) {
cinfo->output_scanline += lines_to_skip;
cinfo->output_iMCU_row += lines_to_skip / lines_per_iMCU_row;
