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Improved comments on the sqlar.c and compress.c extensions that describe

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the differences between the "zlib format" used by SQLAR, the raw deflate
format used by ZIP, and the custom format used by compress.c.  No changes
to code.

FossilOrigin-Name: c13415c5caf06eaa73086c500907451dfcdfd1354ac4a9ab63edb7255edbfa1b
This commit is contained in:
drh
2018-01-07 19:52:28 +00:00
parent 1fa6d9f96f
commit acd6fdee98
4 changed files with 31 additions and 8 deletions
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8
ext/misc/sqlar.c
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@ -24,6 +24,14 @@ SQLITE_EXTENSION_INIT1
** If the type of X is SQLITE_BLOB, and compressing that blob using
** zlib utility function compress() yields a smaller blob, return the
** compressed blob. Otherwise, return a copy of X.
**
** SQLar uses the "zlib format" for compressed content. The zlib format
** contains a two-byte identification header and a four-byte checksum at
** the end. This is different from ZIP which uses the raw deflate format.
**
** Future enhancements to SQLar might add support for new compression formats.
** If so, those new formats will be identified by alternative headers in the
** compressed data.
*/
static void sqlarCompressFunc(
sqlite3_context *context,