11 Sep 2024
Did you ever hear about IMAGE_FILE_UP_SYSTEM_ONLY flag in NtHeader->FileHeader->Characteristics of an exe file? Microsoft says it will make the exe run ONLY on single-cpu machines. In practice it works on multi-cpu machines as well, but the affinity is automatically set to one CPU only! And the allowed CPU is rotated, which is cool imho.
There is even a linker flag for it. You can set it with /DRIVER:UPONLY
But there is more! IMAGE_LOAD_CONFIG_DIRECTORY contains ProcessAffinityMask providing full flexibility with setting affinity. And here comes my question: how to manage it within an exe? I know it theoretically on binary level, but I hope nice editor exists... Maybe SetImageConfigInformation()? Any hints?
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15,473
13 Jun 2022
An option to remove the default header comments entirely, ideally as a setting within Xcode and not by relying on IDETemplateMacros.plist and FILEHEADER.
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12 Apr 2022
Tip: You can customise the default header in files created in Xcode by adding the file MyProject.xcodeproj/xcshareddata/IDETemplateMacros.plist.
The file should contain the key FILEHEADER with the value being your header comment.
ALT Screenshot showing an example of a file located at MyProject.xcodeproj/xcshareddata/IDETemplateMacros.plist and a new Swift file created in Xcode. The IDETemplateMacros.plist contains a key named FILEHEADER with the value “ This file was created in ___YEAR___ ✨”. The Swift file is mostly empty but has the header comment “This file was created in 2022 ✨”
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27 Jul 2020
どうにもVRCのワールド容量が減らんしおかしいぞ？！と思てビルドログ調べたらFileHeader領域がめっちゃあるぞ？！
どうもRealtimeGIを有効にすると間接光シミュ計算されるけどLightMAPサイズが大きくなってここに入るとの事！OFFにしたら見え方簡素になったが容量が150→20MBになった👀‼奥が深いぜ…
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22 Aug 2019
例えば、RIFF は FourCC だけど、WebP の4文字が入るもう一つの FourCC 相当フィールドは Payload に隠れて特に名前ついてない。ChunkName 相当のが ChunkHeader になってて、FileHeader との統一感がない、そういうの適当だとコード書きにくいんだ。。
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30 Jan 2019
BMP コンテナ図書き直した。Color Profile の実態は画像RGB配列の更に後ろに置いたりするのだけど、Info Header の profile data (図ではボカして color profile と書いてる)の要素に (FileHeaderでなく) Info Header の頭からのオフセット値を格納して場所を示す。つまりポインタなのだ。
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13 Aug 2018
Luckily it was a fileheader and code that I had to reconstruct. With the code being identical to an older version except for branches/offsets into the later part of the file that changed.
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9 Apr 2018
たぶん unsigned char型のポインタに入れておいて、ヘッダーを参照したいときだけ、fileHeaderのポインタ型にキャストすればいいと思うのだけれど…
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