Correct mishandling of EDC-less mode 2 form 2 sectors, and of mode 2 formless sectors

README.md

@@ -1,9 +1,9 @@
-edccchk v1.0
-============
+edccchk v1.10
+=============
 
 EDC/ECC checker for RAW (2352 bytes/sector) CD images
 
-Copyright © 2013 Natalia Portillo <claunia@claunia.com>
+Copyright © 2013-2014 Natalia Portillo <claunia@claunia.com>
 
 Based on ECM v1.03 Copyright © 2002-2011 Neill Corlett
 
@@ -21,11 +21,6 @@ Features
 * Supports Mode 0, Mode 1 and Mode 2 data sectors, ignores Audio sectors.
 * Shows failing sectors as MSF.
 
-Known bugs
-==========
-
-Mode 2 form-less sectors all appear as errors. Mode 2 form 1 and form 2 sectors are processed correctly.
-
 Changelog
 =========
 
@@ -33,10 +28,12 @@ Changelog
 * Converted ECM code to only check sectors.
 * Added support for mode 0 sectors.
 
+2014/03/02	v1.10
+* Corrected handling of mode 2 form 2 sectors with omitted EDC. Side-effect, corrects mode 2 form-less sectors processing.
+
 To-Do
 =====
 
-* Support Mode 2 form-less sectors
 * Support RAW+SUB images (2448 bytes/sector)
 * Check Q-subchannel CRCs
 * Check CD+G CRCs

edccchk.c

@@ -398,7 +398,7 @@ static int8_t ecmify(
                 if((sector[0x012] & 0x20) == 0x20) // mode 2 form 2
                 {
                     mode2f2sectors++;
-                    if(edc_compute(0, m2sec, 0x91C) != get32lsb(m2sec + 0x91C))
+                    if(edc_compute(0, m2sec, 0x91C) != get32lsb(m2sec + 0x91C) && get32lsb(m2sec + 0x91C) != 0)
                     {
                         fprintf(stderr, "Mode 2 form 2 sector with error at address: %02X:%02X:%02X\n", sector[0x00C], sector[0x00D], sector[0x00E]);
                         mode2f2errors++;

version.h

@@ -1 +1 @@
-"v1.00"
+"v1.10"