Bug 481284

Description of problem:

I have an ICNS file created by Apple's IconComposer. The ICNS file appears to
work properly on Mac OS X. It contains 4-channel icons at 16x16, 32x32,
128x128, 256x256, and 512x512. icns2png is unable to extract all of the icons
from this file.

This is what I get when I use icns2png to list the contents:

[uckelman@scylla 3.1]$ icns2png -l vassal-apple.icns 
----------------------------------------------------
Reading icns family from vassal-apple.icns...
 Icon family type is 'icns'
 Icon family size is 180945 bytes
 Listing icon elements...
  'is32' 16x16 32-bit icon (1024 bytes compressed to 719)
  's8mk' 16x16 8-bit mask (256 bytes)
  'il32' 32x32 32-bit icon (4096 bytes compressed to 2236)
  'l8mk' 32x32 8-bit mask (1024 bytes)
  'it32' 128x128 32-bit icon (65536 bytes compressed to 18266)
  't8mk' 128x128 8-bit mask (16384 bytes)
  'ic08' 256x256 32-bit icon (262144 bytes compressed to 41997)
  'ic09' 512x512 32-bit icon (1048576 bytes compressed to 99979)
libicns: icns_get_image_info_for_type: Unable to parse icon type 'icnV'
  'icnV' 0x0 0-bit (4 bytes)
 9 elements total in vassal-apple.icns.

An assertion fails when I try to extract the images:

[uckelman@scylla 3.1]$ icns2png -x vassal-apple.icns 
----------------------------------------------------
Reading icns family from vassal-apple.icns...
  Saved 'is32' element to vassal-apple_16x16x32.png.
  Saved 'il32' element to vassal-apple_32x32x32.png.
  Saved 'it32' element to vassal-apple_128x128x32.png.
icns2png: jpc_dec.c:1072: jpc_dec_tiledecode: Assertion `dec->numcomps == 3' failed.
Aborted

If I try to extract the images individually, it works for all of them except
the 256x256 and 512x512, which give me this same failed assertion:

[uckelman@scylla 3.1]$ icns2png -s 256 -x vassal-apple.icns 
----------------------------------------------------
Reading icns family from vassal-apple.icns...
icns2png: jpc_dec.c:1072: jpc_dec_tiledecode: Assertion `dec->numcomps == 3' failed.
Aborted
[uckelman@scylla 3.1]$ icns2png -s 512 -x vassal-apple.icns 
----------------------------------------------------
Reading icns family from vassal-apple.icns...
icns2png: jpc_dec.c:1072: jpc_dec_tiledecode: Assertion `dec->numcomps == 3' failed.
Aborted


According to the libicns release notes, it needs to be linked against jasper
or libopenjpeg to handle the largest images sizes, but ldd says that icns2png
is linked agianst libjasper, so I think that's not the problem.



Version-Release number of selected component (if applicable):

libicns-0.6.1-1.fc10.x86_64
libicns-utils-0.6.1-1.fc10.x86_64

How reproducible:

Always.

Steps to Reproduce:
1. icns2png -x vassal-apple.icns

Actual results:

An assertion fails while extracting the 256x256 image.

Expected results:

All images should extract successfully.