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Diffstat (limited to 'lz4_Block_format.md')
| -rw-r--r-- | lz4_Block_format.md | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lz4_Block_format.md b/lz4_Block_format.md index c56429f..0f6a5ba 100644 --- a/lz4_Block_format.md +++ b/lz4_Block_format.md @@ -75,15 +75,15 @@ This is a 2 bytes value, in little endian format The offset represents the position of the match to be copied from. 1 means "current position - 1 byte". The maximum offset value is 65535, 65536 cannot be coded. -Note that 0 is an invalid value, not used. +Note that 0 is an invalid value, not used. Then we need to extract the match length. For this, we use the second token field, the low 4-bits. Value, obviously, ranges from 0 to 15. However here, 0 means that the copy operation will be minimal. -The minimum length of a match, called minmatch, is 4. +The minimum length of a match, called minmatch, is 4. As a consequence, a 0 value means 4 bytes, and a value of 15 means 19+ bytes. -Similar to literal length, on reaching the highest possible value (15), +Similar to literal length, on reaching the highest possible value (15), we output additional bytes, one at a time, with values ranging from 0 to 255. They are added to total to provide the final match length. A 255 value means there is another byte to read and add. @@ -102,7 +102,7 @@ There are specific parsing rules to respect in order to remain compatible with assumptions made by the decoder : 1. The last 5 bytes are always literals -2. The last match must start at least 12 bytes before end of block. +2. The last match must start at least 12 bytes before end of block. Consequently, a block with less than 13 bytes cannot be compressed. These rules are in place to ensure that the decoder |