mirror of
https://github.com/ckolivas/lrzip.git
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b27e1df879
This reverts commit 131d4c92c2.
Breaks STDIN/OUT so revert this change and cope with the slightly extra file size on non-chunked files.
126 lines
2.6 KiB
Plaintext
126 lines
2.6 KiB
Plaintext
lrzip-0.6x file format
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March 2011
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Con Kolivas
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Byte Content
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0-23 Magic
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---
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24+ Rzip Chunk Data (RCD)
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RCD+ Data blocks
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--- repeat
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(end-MD5_DIGEST_SIZE)->(end) md5 hash
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Magic data:
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0->3 LRZI
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4 LRZIP Major Version Number
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5 LRZIP Minor Version Number
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6->14 Source File Size or 0 if unknown, or salt in encrypted file
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16->20 LZMA Properties Encoded (lc,lp,pb,fb, and dictionary size)
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21 1 = md5sum hash is stored at the end of the archive
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22 1 = data is encrypted with sha512/aes128
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23 Unused
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Encrypted salt (bytes 6->14 in magic if encrypted):
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0->1 Encoded number of loops to hash password
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2->7 Random data
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(RCD0 is set to 8 bytes always on encrypted files)
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Rzip Chunk Data:
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0 Data offsets byte width (meaning length is < (2 * 8)^RCD0)
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1 Flag that there is no chunk beyond this
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(RCD0 bytes) Chunk decompressed size (not stored in encrypted file)
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XX Stream 0 header data
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XX Stream 1 header data
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Stream Header Data:
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Byte:
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0 Compressed data type
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(RCD0 bytes) Compressed data length
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(RCD0 bytes) Uncompressed data length
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(RCD0 bytes) Next block head
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Data blocks:
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0->(end-2) data
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(end-1)->end crc data
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lrzip-0.5x file format
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March 2011
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Con Kolivas
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Byte Content
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0->23 Magic
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--
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24->74 Rzip chunk data
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75+ Data blocks
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-- repeat
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(end-MD5_DIGEST_SIZE)->(end) md5 hash
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Magic data:
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0->3 LRZI
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4 LRZIP Major Version Number
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5 LRZIP Minor Version Number
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6->14 Source File Size
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16->20 LZMA Properties Encoded (lc,lp,pb,fb, and dictionary size)
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21 Flag that md5sum hash is stored at the end of the archive
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22-23 not used
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Rzip chunk data:
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0 Data offsets byte width
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1-25 Stream 0 header data
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26-50 Stream 1 header data
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Stream Header Data:
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Byte:
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0 Compressed data type
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1-8 Compressed data length
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9-16 Uncompressed data length
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17-24 Next block head
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Data blocks:
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0->(end-2) data
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(end-1)->end crc data
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lrzip-0.40+ file header format
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November 2009
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Con Kolivas
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Byte Content
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0-3 LRZI
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4 LRZIP Major Version Number
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5 LRZIP Minor Version Number
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6-14 Source File Size
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16-20 LZMA Properties Encoded (lc,lp,pb,fb, and dictionary size)
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21-24 not used
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24-48 Stream 1 header data
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49-74 Stream 2 header data
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Block Data:
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Byte:
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0 Compressed data type
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1-8 Compressed data length
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9-16 Uncompressed data length
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17-24 Next block head
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25+ Data
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End:
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0-1 crc data
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lrzip-0.24+ file header format
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January 2009
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Peter Hyman, pete@peterhyman.com
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Byte Content
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0-3 LRZI
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4 LRZIP Major Version Number
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5 LRZIP Minor Version Number
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6-9 Source File Size (no HAVE_LARGE_FILES)
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6-14 Source File Size
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16-20 LZMA Properties Encoded (lc,lp,pb,fb, and dictionary size)
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21-23 not used
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24-36 Stream 1 header data
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37-50 Stream 2 header data
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51 Compressed data type
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