diff options
Diffstat (limited to 'ext/misc/fossildelta.c')
| -rw-r--r-- | ext/misc/fossildelta.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/ext/misc/fossildelta.c b/ext/misc/fossildelta.c index b58d358b5..7e78f6fb1 100644 --- a/ext/misc/fossildelta.c +++ b/ext/misc/fossildelta.c @@ -10,7 +10,25 @@ ** ****************************************************************************** ** -** This SQLite extension implements the delta functions used by Fossil. +** This SQLite extension implements the delta functions used by the RBU +** extension. Three scalar functions and one table-valued function are +** implemented here: +** +** delta_apply(X,D) -- apply delta D to file X and return the result +** delta_create(X,Y) -- compute and return a delta that carries X into Y +** delta_output_size(D) -- blob size in bytes output from applying delta D +** delta_parse(D) -- returns rows describing delta D +** +** The delta format is the Fossil delta format, described in a comment +** on the delete_create() function implementation below, and also at +** +** https://www.fossil-scm.org/fossil/doc/trunk/www/delta_format.wiki +** +** This delta format is used by the RBU extension, which is the main +** reason that these routines are included in the extension library. +** RBU does not use this extension directly. Rather, this extension is +** provided as a convenience to developers who want to analyze RBU files +** that contain deltas. */ #include <string.h> #include <assert.h> |