![]() Apple isn’t well known for backwards compatibility after all.įrom the hexdump above, we see the 8 byte header of an icns file. Preview also doesn’t open a lot of other icns files that I have downloaded, so I’m not sure if the latest MacOS release has broken certain features. When this is done, we see that MacOS renders the icons correctly, even when Preview app doesn’t open it. The entire Bash code to extract the icns files from the rsrc files is then: for filename in *.rsrc doĬp $filename/.namedfork/rsrc $filename.icnsĭd if=$filename.icns of=$ bs=260 skip=1 We can use dd to extract the relevant segment. Icns files have a magic literal of icns, and we see 69 63 6e 73 at an offset of 260 bytes into the extracted icns files. The extracted binary files appear corrupted, and opening the files in xxd reveals a lot of leading zeroes in the files. The binary data at the resource fork can be accessed as 1.rsrc/.namedfork/rsrc, and therefore we can use cp to extract the resource fork data: cp 1.rsrc/.namedfork/rsrc 1.icns Apple Icon Image (icns) The forks and their sizes can be listed with ls command with flag We can see that while the file 1.rsrc itself is 0 bytes, the ResourceFork is 122235 bytes. When I tried to upload the rsrc files to GitHub using the web interface, GitHub returns an empty file error. However, if we create a hexdump of the file with xxd, we see that the file is empty. 2)įrom the Get Info window of a rsrc file, we see that its file size is 122,235 bytes. ![]() (It is commonly said that ADS was added as a feature to Windows to add support for Mac file system. This is equivalent to the concept of alternate data stream (ADS) in Windows OS. ![]() Resource forks were important in the classic Mac OS as they provided a standard way to store structured file data, metadata and application resources. The Apple icon image ( icns) files that I am looking for are not within the resource files, but rather stored in the resource forks of the rsrc file. Mac OS 9 Icons extracted as png Macintosh Resource Files (rsrc) Definitely feel free to download them if you want to poke around. You can also find the original files in the repository. If you are here looking just for the icons, I have uploaded them all to GitHub. Thus, this is my journey in further extracting the icon files! The Extracted Icons / Downloads The problem is that the files are in the rsrc format and I really need them in png. Luckily, NazoraioiSkadinaujo on DeviantArt 1 had ran into the same issue and decided to extract the icons themselves back in 2008. Recently I have been looking for Mac OS 9 icons for a separate project, but they are getting rarer by the days. ![]()
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