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Difference between pages "Compression" and "Chrome Disk Cache Format"

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(Deflate/Inflate)
 
(Created page with "{{expand}} == Cache files == The cache is stored in multiple: {| class="wikitable" |- ! Filename ! Description |- | index | The index file |- | data_# | Data block files |- |...")
 
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{{Expand}}
+
{{expand}}
  
== LZ-based ==
+
== Cache files ==
 +
The cache is stored in multiple:
 +
{| class="wikitable"
 +
|-
 +
! Filename
 +
! Description
 +
|-
 +
| index
 +
| The index file
 +
|-
 +
| data_#
 +
| Data block files
 +
|-
 +
| f_######
 +
| (Separate) data stream file
 +
|}
  
=== Deflate/Inflate ===
+
== Cache address ==
Used in:
+
The cache address is 4 bytes in size and consists of:  
* [[Encase image file format|Expert Witness (Compression) Format (EWF)]]
+
{| class="wikitable"
* [[Gzip|gzip]]
+
|-
* [[Personal Folder File (PAB, PST, OST)]], in compressed Offline Storage Table (OST) files.
+
! offset
* [[QCOW Image Format]], in compressed images
+
! size
* [[VMWare Virtual Disk Format (VMDK)]], in compressed images
+
! value
 +
! description
 +
|-
 +
| <i>If file type is 0 (Separate file)</i>
 +
|
 +
|
 +
|
 +
|-
 +
| 0.0
 +
| 28 bits
 +
|
 +
| File number <br> The value represents the value of # in f_######
 +
|-
 +
| <i>Else</i>
 +
|
 +
|
 +
|
 +
|-
 +
| 0.0
 +
| 16 bits
 +
|
 +
| Block number
 +
|-
 +
| 2.0
 +
| 8 bits
 +
|
 +
| File number (or file selector) <br> The value represents the value of # in data_#
 +
|-
 +
| 3.0
 +
| 2 bits
 +
|
 +
| Block size <br> The number of contiguous blocks where 0 represents 1 block and 3 represents 4 blocks.
 +
|-
 +
| 3.2
 +
| 2 bits
 +
|
 +
| Reserved
 +
|-
 +
| <i>Common</i>
 +
|
 +
|
 +
|
 +
|-
 +
| 3.4
 +
| 3 bits
 +
|
 +
| File type
 +
|-
 +
| 3.7
 +
| 1 bit
 +
|
 +
| Initialized flag
 +
|}
  
=== LZNT1 ===
+
=== File types ===
Used in:
+
{| class="wikitable"
* [[NTFS]]
+
|-
* [[Windows SuperFetch Format]]
+
! Value
 +
! Description
 +
|-
 +
| 0
 +
| (Separate) data stream file
 +
|-
 +
| 1
 +
| (Rankings) block data file (36 byte block data file)
 +
|-
 +
| 2
 +
| 256 byte block data file
 +
|-
 +
| 3
 +
| 1024 byte block data file
 +
|-
 +
| 4
 +
| 4096 byte block data file
 +
|-
 +
|
 +
|
 +
|
 +
|-
 +
| 6
 +
| Unknown; seen on Mac OS  X 0x6f430074
 +
|}
  
=== LZXPRESS ===
+
=== Examples ====
Used in:
+
{| class="wikitable"
* [[Extensible Storage Engine (ESE) Database File (EDB) format]]
+
|-
 +
! Value
 +
! Description
 +
|-
 +
| 0x00000000
 +
| Not initialized
 +
|-
 +
| 0x8000002a
 +
| Data stream file: f_00002a
 +
|-
 +
| 0xa0010003
 +
| Block data file: data_1, block number 3, 1 block of size
 +
|}
  
=== LZXPRESS Huffman ===
+
== See Also ==
Used in:
+
* [[Google Chrome]]
* [[Windows SuperFetch Format]]
+
  
 
== External Links ==
 
== External Links ==
* [http://en.wikipedia.org/wiki/Lempel-Ziv Wikipedia: Lempel-Ziv]
 
* [http://www.coderforlife.com/microsoft-compression-formats/ Microsoft Compression Formats]
 
  
=== Deflate/Inflate ===
+
[[Category:File Formats]]
* [http://en.wikipedia.org/wiki/DEFLATE Wikipedia: DEFLATE]
+
* [https://tools.ietf.org/html/rfc1950 RFC1950 - ZLIB Compressed Data Format Specification], by [[IETF]]
+
* [https://tools.ietf.org/html/rfc1951 RFC1951 - DEFLATE Compressed Data Format Specification], by [[IETF]]
+
 
+
=== LZ1 ===
+
* [http://andyh.org/LZ1.html LZ1]
+

Revision as of 18:25, 21 June 2014

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Please help to improve this article by expanding it.
Further information might be found on the discussion page.

Cache files

The cache is stored in multiple:

Filename Description
index The index file
data_# Data block files
f_###### (Separate) data stream file

Cache address

The cache address is 4 bytes in size and consists of:

offset size value description
If file type is 0 (Separate file)
0.0 28 bits File number
The value represents the value of # in f_######
Else
0.0 16 bits Block number
2.0 8 bits File number (or file selector)
The value represents the value of # in data_#
3.0 2 bits Block size
The number of contiguous blocks where 0 represents 1 block and 3 represents 4 blocks.
3.2 2 bits Reserved
Common
3.4 3 bits File type
3.7 1 bit Initialized flag

File types

Value Description
0 (Separate) data stream file
1 (Rankings) block data file (36 byte block data file)
2 256 byte block data file
3 1024 byte block data file
4 4096 byte block data file
6 Unknown; seen on Mac OS X 0x6f430074

Examples =

Value Description
0x00000000 Not initialized
0x8000002a Data stream file: f_00002a
0xa0010003 Block data file: data_1, block number 3, 1 block of size

See Also

External Links