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Update file_format.md

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Add support for per-file compressing by storing the
compressor/decompressor commands in the per-file header part of the
.simplearchive.
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Stephen Seo 2024-06-27 10:36:06 +09:00
parent 49c6923200
commit 002590379e
1 changed files with 10 additions and 2 deletions
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file_format.md
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@ -18,8 +18,16 @@ For each file:
1. 2 bytes is 16-bit unsigned integer "filename length" in big-endian. 1. 2 bytes is 16-bit unsigned integer "filename length" in big-endian.
2. X bytes of filename (defined by previous value). 2. X bytes of filename (defined by previous value).
3. 8 bytes 64-bit unsigned integer "location of filename in this archive file". 3. 2 bytes is 16-bit unsigned integer "compressor cmd+args" in big-endian.
4. 8 bytes 64-bit unsigned integer "size of filename in this archive file". 4. X bytes of "compressor cmd+args" (defined by previous value).
5. 2 bytes is 16-bit unsigned integer "decompressor cmd+args" in big-endian.
6. X bytes of "decompressor cmd+args" (defined by previous value).
7. 8 bytes 64-bit unsigned integer "location of filename in this archive file".
8. 8 bytes 64-bit unsigned integer "size of filename in this archive file".
Note that if archiving without compressor/decompressor, the byte values for
them will be 0 and there will be no strings for the compressor/decompressor
commands (lines 4 and 6 in previous per-file entry will not exist).
The remaining bytes in the file are the files to be included in the archive file The remaining bytes in the file are the files to be included in the archive file
concatenated together. Their locations and sizes should match what was listed concatenated together. Their locations and sizes should match what was listed