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Overview
Comment:Improved comments on the fossildelta.c extension.
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SHA3-256: d7d23f0450d659b2c7df34e4df8623ca7b6fe3bd19422e3e9234515214ae8510
User & Date: drh 2019-03-02 20:09:35.788
Context
2019-03-04
07:15
Fix a problem preventing compilation with SQLITE_OMIT_UTF16. (check-in: 906d1fd865 user: dan tags: trunk)
2019-03-02
20:09
Improved comments on the fossildelta.c extension. (check-in: d7d23f0450 user: drh tags: trunk)
15:25
Fix the SQLITE_DIRECT_OVERFLOW_READ compile-time option so that it works with SQLITE_HAS_CODEC. (check-in: fd085e9260 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to ext/misc/fossildelta.c.
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/*
** 2019-02-19
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** This SQLite extension implements the delta functions used by Fossil.


















*/
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1













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/*
** 2019-02-19
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
******************************************************************************
**
** 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>
#include <stdlib.h>
#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1