diff options
Diffstat (limited to 'ext/misc/compress.c')
| -rw-r--r-- | ext/misc/compress.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/ext/misc/compress.c b/ext/misc/compress.c index bf38d4c93..6e7d8b614 100644 --- a/ext/misc/compress.c +++ b/ext/misc/compress.c @@ -27,6 +27,21 @@ SQLITE_EXTENSION_INIT1 ** seven bits per integer stored in the lower seven bits of each byte. ** More significant bits occur first. The most significant bit (0x80) ** is a flag to indicate the end of the integer. +** +** This function, SQLAR, and ZIP all use the same "deflate" compression +** algorithm, but each is subtly different: +** +** * ZIP uses raw deflate. +** +** * SQLAR uses the "zlib format" which is raw deflate with a two-byte +** algorithm-identification header and a four-byte checksum at the end. +** +** * This utility uses the "zlib format" like SQLAR, but adds the variable- +** length integer uncompressed size value at the beginning. +** +** This function might be extended in the future to support compression +** formats other than deflate, by providing a different algorithm-id +** mark following the variable-length integer size parameter. */ static void compressFunc( sqlite3_context *context, |