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==PSARC structure notes==
Debian psarc Kplugin structure. From Manuel Stahl (thymythos) @ http://opendesktop.org/content/show.php/PSARC+file+header?content=162745
<?xml version="1.0" encoding="UTF-8"?>
<data>
  <struct name="header">
    <primitive name="magic" type="UInt32" />
    <primitive name="version" type="UInt32" />
    <primitive name="compression" type="UInt32" />
    <primitive name="TOC length" type="UInt32" />
    <primitive name="TOC entry size" type="UInt32" />
    <primitive name="num_entries" type="UInt32" />
    <primitive name="max block size" type="UInt32" />
    <primitive name="archive flags" type="UInt32" />
    <array name="TOC" length="num_entries">
      <struct name="entry">
        <array name="MD5" length="16"><primitive type="UInt8"/></array>
        <primitive name="zIndex" type="UInt32" />
        <bitfield name="length" width="40" type="unsigned" />
        <bitfield name="offset" width="40" type="unsigned" />
      </struct>
    </array>
    <array name="block sizes" length="num_entries">
      <bitfield name="size" width="16" type="unsigned" /><!-- only valid for "max block size" == 2^16 -->
    </array>
  </struct>
</data>
PSARC header example:
'''Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F'''
00000000  <span style="background:#ff6666;">50 53 41 52</span> <span style="background:#66ff66;">00 01 00 04</span> <span style="background:#ffff66;">7A 6C 69 62</span> <span style="background:#6666ff;">00 01 23 BA</span>  PSAR....zlib..#º
00000010  <span style="background:#dd00dd;">00 00 00 1E</span> <span style="background:#dddd00;">00 00 09 16</span> <span style="background:#dddddd;">00 01 00 00</span> <span style="background:#d0000d;">00 00 00 02</span>  ................
00000020  <span style="background:#ff6666;">00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00</span>  ................
00000030  <span style="background:#ff6666;">00 00 00 00 00 00</span> <span style="background:#66ff66;">01 79 D9 00</span> 00 01 23 BA A9 A6  .......yÙ...#º©¦
00000040  AB EE E6 73 40 2A E6 C3 37 24 3F C1 81 16 00 00  «îæs@*æÃ7$?Á....
00000050  00 02 00 00 00 1D 90 00 00 01 45 3B 5A 08 E7 AC  ..........E;Z.ç¬
{| class="wikitable"
|-
! !! Offset !! Size !! Name !! Example !! Value (conversion) !! Notes
|-
|rowspan="8" style="background-color:#50534152; color:#000FFF;"|'''Header'''
| style="background-color:#ff6666;" | 0x00 || style="background-color:#ff6666;" | 0x04 || '''magic''' || 50 53 41 52 || PSAR || '''P'''lay'''S'''tation '''Ar'''chive
|-
| style="background-color:#66ff66;" | 0x04 || style="background-color:#66ff66;" | 0x04 || '''version''' || 00 01 00 04 || v1.4 || First 2 bytes is the main version, next 2 bytes is the subversion and are processed separatedlly, so 0001.0004 is "translated" to 1.4 by the system
|-
| style="background-color:#ffff66;" | 0x08 || style="background-color:#ffff66;" | 0x04 || '''compression type''' || 7A 6C 69 62 || zlib || zlib (default) or lzma
|-
| style="background-color:#6666ff;" | 0x0C || style="background-color:#6666ff;" | 0x04 || '''table of content length''' || 00 01 23 BA || 0x123BA ||
|-
| style="background-color:#dd00dd;" | 0x10 || style="background-color:#dd00dd;" | 0x04 || '''table of content entries size''' || 00 00 00 1E || 30 Bytes || Default is 30 bytes
|-
| style="background-color:#dddd00;" | 0x14 || style="background-color:#dddd00;" | 0x04 || '''number of entries''' || 00 00 09 16 || 1+2325 files || The filecount includes the "file path/names definitions" as an additionall file always placed at first position in the list and without an assigned ID
|-
| style="background-color:#dddddd;" | 0x18 || style="background-color:#dddddd;" | 0x04 || '''block size''' || 00 01 00 00 || 65536 Bytes || Default is 65536 Bytes
|-
| style="background-color:#d0000d;" | 0x1C || style="background-color:#d0000d;" | 0x04 || '''archive flags''' || 00 00 00 02 || 2 || Default is 2. Unknown yet but is a "bit value" so 2 is a single flag
*
*
|-
|rowspan="2" style="background-color:#50534152; color:#000FFF;"|'''TOC'''
| style="background-color:#ff6666;" | 0x20 || style="background-color:#ff6666;" | 0x16 || '''name digest''' || 00 00 ... 00 00  || - || 128-bit md5 hash
|-
| style="background-color:#66ff66;" | 0x36 || style="background-color:#66ff66;" | 0x04 || '''index list''' || - || - || Size of the (compressed per default) index list.
|}
==Regular Expressions notes==
Psarc uses regular expressions compatibles with PERL 5, most specifically the ones used by PCRE library http://www.pcre.org/ As can be seen in the license texts of the software used in PS3 in XMB/Settings/System Settings/About PlayStation®3 (PS3™)
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