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Improved comments on the fossildelta.c extension.

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FossilOrigin-Name: d7d23f0450d659b2c7df34e4df8623ca7b6fe3bd19422e3e9234515214ae8510
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drh
2019-03-02 20:09:35 +00:00
parent e22976c535
commit 75db74fdae
3 changed files with 26 additions and 8 deletions
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ext/misc/fossildelta.c
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@ -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>