Overview
| SHA1 Hash: | 5fcb36c81bb61bc7b9c1e1b6036bc308dbee704c |
|---|---|
| Date: | 2007-08-26 01:32:11 |
| User: | aku |
| Comment: | Added documentation of the delta format |
| Timelines: | ancestors | descendants | both | trunk |
| Other Links: | files | ZIP archive | manifest |
Tags And Properties
- branch=trunk inherited from [a28c83647d]
- sym-trunk inherited from [a28c83647d]
Changes
[hide diffs]Added art/delta1.dia version [1e1461fa6f]
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Added art/delta6.dia version [638abaa6b4]
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Added www/delta1.gif version [fc676aedbe]
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Added www/delta2.gif version [305bcc0781]
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Added www/delta3.gif version [ecdccfa728]
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Added www/delta4.gif version [235b08d75c]
cannot compute difference between binary files
Added www/delta5.gif version [990001794f]
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@@ -1,1 +1,221 @@ +<html> +<head> +<title>Fossil Delta Format</title> +</head> +<body bgcolor="white"> +<h1 align="center"> +Fossil Delta Format +</h1> + +<p>A key component for the efficient storage of multiple revisions of +a file in fossil repositories is the use of delta-compression, i.e. to +store only the changes between revisions instead of the whole +file.</p> + +<p>This document describes the format used to encode such changes, +also known as "delta". It is targeted at developers working on either +<a href="index.html">fossil</a> itself, or on tools compatible with +it.</p> + +<h2>Structure</h2> +<img src="delta1.gif" align="left" hspace="10"> + +<p>A delta consists of three parts, a "header", a "trailer", and a +"segment-list" between them.</p> + +<p>Both header and trailer provide information about the target +helping the decoder, and the segment-list describes how the target can +be constructed from the original.</p> + +<h3>Header</h3> +<img src="delta6.gif" align="left" hspace="10"> + +<p>The header consists of a single number followed by a newline +character (ASCII 0x0a). The number is the length of the target in +bytes.</p> + +<p>This means that, given a delta, the decoder can compute the size of +the target (and allocate any necessary memory based on that) by simply +reading the first line of the delta and decoding the number found +there. In other words, before it has to decode everything else.</p> + +<h3>Trailer</h3> +<img src="delta5.gif" align="left" hspace="10"> + +<p>The trailer consists of a single number followed by a semicolon (ASCII +0x3b). This number is a checksum of the target and can be used by a +decoder to verify that the delta applied correctly, reconstructing the +target from the original.</p> + +<p>The checksum is computed by treating the target as a series of +32-bit integer numbers (MSB first), and summing these up, modulo +2^32-1. A target whose length is not a multiple of 4 is padded with +0-bytes (ASCII 0x00) at the end.</p> + +<p>By putting this information at the end of the delta a decoder has +it available immediately after the target has been reconstructed +fully.</p> + +<h3>Segment-List</h3> +<img src="delta2.gif" align="left" hspace="10"> + +<p>The segment-list of a delta describes how to create the target from +the original by a combination of inserting literal byte-sequences and +copying ranges of bytes from the original. This is there the +compression takes place, by encoding the large common parts of +original and target in small copy instructions.</p> + +<p>The target is constructed from beginning to end, with the data +generated by each instruction appended after the data of all previous +instructions, with no gaps.</p> + +<h4>Insert Literal</h4> + +<p>A literal is specified by two elements, the size of the literal in +bytes, and the bytes of the literal itself.</p> + +<img src="delta4.gif" align="left" hspace="10"> +<p>The length is written first, followed by a colon character (ASCII +0x3a), followed by the bytes of the literal.</p> + +<h4>Copy Range</h4> + +<p>A range to copy is specified by two numbers, the offset of the +first byte in the original to copy, and the size of the range, in +bytes. The size zero is special, its usage indicates that the range +extends to the end of the original.</p> + +<img src="delta3.gif" align="left" hspace="10"> +<p>The length is written first, followed by an "at" character (ASCII +0x40), then the offset, followed by a comma (ASCII 0x2c).</p> + +<h2>Encoding of integers</h2> + +<p> +The format currently handles only 32 bit integer numbers. They are +written base-64 encoded, MSB first, and without leading +"0"-characters, except if they are significant (i.e. 0 => "0"). +</p> + +<p> +The base-64 coding is described in +<a href="http://www.ietf.org/rfc/rfc3548.txt">RFC 3548</a>. +</p> + +<h2>Examples</h2> + +<h3>Number encoding</h3> + +<table border=1> +<tr> +<th>Value</th> +<th>Encoding</th> +</tr> +<tr> +<td>0</td> +<td>0</td> +</tr> +<tr> +<td>6246</td> +<td>1Xb</td> +</tr> +<tr> +<td>-1101438770</td> +<td>2zMM3E</td> +</tr> +</table> + +<h3>Delta</h3> + +<p>An example of a delta using the specified encoding is:</p> + +<table border=1><tr><td><pre> +1Xb +4E@0,2:thFN@4C,6:scenda1B@Jd,6:scenda5x@Kt,6:pieces79@Qt,F: Example: eskil~E@Y0,2zMM3E;</pre> +</td></tr></table> + +<p>This can be taken apart into the following parts:</p> + +<table border=1> +<tr><th>What </th> <th>Encoding </th><th>Meaning </th><th>Details</th></tr> +<tr><td>Header</td> <td>1Xb </td><td>Size </td><td> 6246 </td></tr> +<tr><td>S-List</td> <td>4E@0, </td><td>Copy </td><td> 270 @ 0 </td></tr> +<tr><td> </td> <td>2:th </td><td>Literal </td><td> 2 'th' </td></tr> +<tr><td> </td> <td>FN@4C, </td><td>Copy </td><td> 983 @ 268 </td></tr> +<tr><td> </td> <td>6:scenda </td><td>Literal </td><td> 6 'scenda' </td></tr> +<tr><td> </td> <td>1B@Jd, </td><td>Copy </td><td> 75 @ 1256 </td></tr> +<tr><td> </td> <td>6:scenda </td><td>Literal </td><td> 6 'scenda' </td></tr> +<tr><td> </td> <td>5x@Kt, </td><td>Copy </td><td> 380 @ 1336 </td></tr> +<tr><td> </td> <td>6:pieces </td><td>Literal </td><td> 6 'pieces' </td></tr> +<tr><td> </td> <td>79@Qt, </td><td>Copy </td><td> 457 @ 1720 </td></tr> +<tr><td> </td> <td>F: Example: eskil</td><td>Literal </td><td> 15 ' Example: eskil'</td></tr> +<tr><td> </td> <td>~E@Y0, </td><td>Copy </td><td> 4046 @ 2176 </td></tr> +<tr><td>Trailer</td><td>2zMM3E </td><td>Ckecksum</td><td> -1101438770 </td></tr> +</table> + +<p>The unified diff behind the above delta is</p> + +<table border=1><tr><td><pre> +bluepeak:(761) ~/Projects/Tcl/Fossil/Devel/devel > diff -u ../DELTA/old ../DELTA/new +--- ../DELTA/old 2007-08-23 21:14:40.000000000 -0700 ++++ ../DELTA/new 2007-08-23 21:14:33.000000000 -0700 +@@ -5,7 +5,7 @@ + + * If the server does not have write permission on the database + file, or on the directory containing the database file (and +- it is thus unable to update database because it cannot create ++ it is thus unable to update the database because it cannot create + a rollback journal) then it currently fails silently on a push. + It needs to return a helpful error. + +@@ -27,8 +27,8 @@ + * Additional information displayed for the "vinfo" page: + + + All leaves of this version that are not included in the +- decendent list. With date, user, comment, and hyperlink. +- Leaves in the decendent table should be marked as such. ++ descendant list. With date, user, comment, and hyperlink. ++ Leaves in the descendant table should be marked as such. + See the compute_leaves() function to see how to find all + leaves. + + Add file diff links to the file change list. +@@ -37,7 +37,7 @@ + + * The /xfer handler (for push, pull, and clone) does not do + delta compression. This results in excess bandwidth usage. +- There are some code in xfer.c that are sketches of ideas on ++ There are some pieces in xfer.c that are sketches of ideas on + how to do delta compression, but nothing has been implemented. + + * Enhancements to the diff and tkdiff commands in the cli. +@@ -45,7 +45,7 @@ + single file. Allow diffs against any two arbitrary versions, + not just diffs against the current check-out. Allow + configuration options to replace tkdiff with some other +- visual differ of the users choice. ++ visual differ of the users choice. Example: eskil. + + * Ticketing interface (expand this bullet) + +</pre></td></tr></table> + + + +<h2>Notes</h2> + +<ul> +<li>Pure text files generate a pure text delta. +</li> +<li>Binary files generate a delta that may contain some binary data. +</li> +<li>Instead of putting special instructions for general compression +into the delta-format itself, specifically the segment-list, like +run-length encoding of literals, etc. it was considered to be much +more sensible to keep the various concern separate and use a general +compression library, like <a href="http://www.zlib.net">zlib</a>, to +compress the full delta after its generation. +</li> +</ul> +</body> +</html>
Modified www/index.html from [62a56c4597] to [7006a635c1].
@@ -86,9 +86,11 @@ <li><a href="pop.html">Principals Of Operation</a></li> <li>The <a href="selfcheck.html">automatic self-check</a> mechanism helps insure project integrity.</li> <li>The <a href="fileformat.html">file format</a> used by every content file stored in the repository.</li> +<li>The <a href="delta_format.html">format of deltas</a> used to +efficiently store changes between file revisions.</li> </ul> </body> </html>