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Expressions
Expressions in the patterns are arithmetic expressions which syntax is similar to that of the C language, including
operation preceding.
The following operations are supported:
+ - * / & | > < <= >= != == || &&
Predefined variables
offset
An offset in bytes from the pattern beginning data is currently read at.
start_position
An absolute position of the pattern beginning. offset + start_position = absolute offset.
this
This variable exists only within the context of the ass-offset expression evaluation and is the current value
of the data field for which that expression is specified
3.3 Pattern Example I
Below is an example of a commented pattern parsing an AVI file.
<?xml version="1.0" encoding="utf-8"?>
<!-- A pattern section. The pattern name is AVI File. -->
<template name="AVI File">
<!-- A template signature section. Alignment is 1. -->
<signature align="1">
<!-- A 4-byte signature at offset 0x00. -->
<field offset="0x00">52 49 46 46</field> <!-- ANSI: RIFF -->
<!-- A 4-byte signature at offset 0x08. -->
<field offset="0x08">41 56 49 20</field> <!-- ANSI: LIST -->
</signature>
<!-- A data section. Its name is AVI File. This is the main data section. It is not shown in the parsing tree as
a section (its name is ignored). -->
<section name="AVI File">
<!-- The first 4 bytes are read and shown as an ANSI string. -->
<field type="char" size="4" name="Signature: RIFF" var="signature"/>
<!-- The current position is moved to the beginning of the file. -->
<goto offset="-4"/>
<!-- The first 4 bytes in the file are read and shown as an unsigned integer. The internal variable
signature gets the value of the field. -->
<field type="uint32" base="hex" name="Signature RIFF as unsigned integer in hex
format" var="signature"/>
<!-- A test against the condition (signature == RIFF) -->
- User's Manual 1
- Table of Contents 3
- Index 253 5
- Introduction to R-Studio 6
- Drives panel, smart copy 7
- 1.2 System Requirements 8
- 1.4 R-Studio Main Panel 9
- R-Studio Manual5 10
- Drives panel: 10
- Changing the program language 11
- Panel view options 11
- To select the units 13
- 1.5 R-Studio Settings 14
- Hexadecimal editor 15
- 2.1 Basic File Recovery 21
- Folders panel 23
- Studio, but with 23
- THEY RESIDE!!! 27
- To search for a file 28
- To repeat the search 30
- To preview a file 31
- R-Studio Manual27 32
- To specify a file mask 34
- 2.2 Advanced Data Recovery 35
- R-Studio Main panel 44
- Drives panel after scanning: 45
- R-Studio Manual41 46
- Scan Information dialog box 46
- Multiple scans 47
- Managing scan information 48
- To load scan information 48
- To remove scan information 49
- To create a Known File Type 49
- Signature file example 52
- File structure 52
- File header 52
- Section FileTypeList 52
- Section FileType 52
- Element Signature 53
- Sections Begin and End 57
- Sections AND and OR 58
- To create a region 59
- To remove a region 60
- To create an exclusive region 61
- To remove an exclusive region 62
- To create an image 62
- To open an image 65
- Binary (byte to byte copy) 66
- Drives Copy Wizard 67
- Smart partition copy 69
- R-Studio Manual65 70
- Smart drive copy 72
- 2.3 Mass File Recovery 74
- Memory considerations 75
- Recover all files 75
- Creating a file recovery list 78
- 2.4 Volume Sets and RAIDs 80
- Missing Disks and Empty Space 81
- To create a Volume set object 82
- To create a RAID 5 object 86
- R-Studio Manual83 88
- Reed-Solomon 88
- To create a RAID 6 object 89
- Double Xor on the RAID type 91
- To create such RAID 5 95
- R-Studio Manual95 100
- Delete key to clear a cell 100
- Advanced RAID 5 102
- To create such RAID 102
- Advanced RAID 6 Layout 104
- To create a RAID 10 object 108
- To create a RAID 1E object 110
- R-Studio Manual107 112
- Drives panel 112
- To create a RAID 5E object 113
- To create a RAID 5EE object 115
- Data Recovery Using R-Studio 117
- To create a RAID 6E object 118
- R-Studio Manual115 120
- To check RAID consistency 123
- Element Block 126
- Section Sequences 126
- Section structure example: 126
- Element Sequence 126
- Basic RAID 5 128
- RAID 5 with parity delays 128
- Advanced RAID 132
- Advanced RAID 6 133
- RAID10 (1+0) 134
- RAID6 (Double Xor) 137
- main panel 140
- Connection directions 147
- Text/hexadecimal Editor 150
- To enable writing 151
- Locking and unlocking objects 151
- To view/edit an object 152
- R-Studio Manual149 154
- Binary view 154
- Text view 154
- Find Results 155
- 3.2 Creating Custom Patterns 159
- Pattern header 160
- Section template 160
- Section signature 160
- Section section 160
- Data types (in field) 160
- Commands 162
- 3.3 Pattern Example I 163
- 3.4 Pattern Example II 166
- 4.2 Data Recovery Issues 172
- Cross-Linked Folders 173
- To find a target folder 173
- Questionable Folders 173
- 4.4 Data Formats 174
- 4.6 Bad Sectors 175
- 4.7 Memory Usage 176
- 4.8 Forensic Mode 176
- To enable this feature 177
- 4.9 R-Studio Switches 192
- 4.10 Properties Tab 193
- 4.Partition properties 195
- 5.Compound volume properties 195
- 5.1 DeepSpar Disk Imager™ 199
- R-Studio Manual195 200
- Working with DDI 201
- Viewing the drive map 202
- To view the drive map 202
- Viewing the file map 204
- To view the file map 204
- R-Studio Emergency 206
- 6.3 Creating Startup Disks 207
- Emergency 208
- Emergency 210
- R-Studiostartup disks 214
- To scan an object 217
- To save scan information 217
- To open scan information 217
- To delete scan information 217
- Data Storage Devices 220
- Networking Devices 220
- Ethernet (10 or 100Mbit) 220
- SCSI low-level drivers 221
- Ethernet (1000 Mbit) 221
- Ethernet (10000 Mbit) 222
- Token Ring driver support 222
- USB support 223
- Block devices 223
- IEEE 1394 (FireWire) support 223
- USB Network Adapters 223
- PCMCIA network device support 224
- Other devices 224
- R-Studio Agent Emergency 225
- Agent Emergency 230
- Startup Disk 233
- R-Studio via network 235
- Disk controllers 236
- R-Studio Manual233 238
- SCSI host adapters: 239
- R-Studio Manual235 240
- R-Studio Manual237 242
- R-Studio Manual239 244
- Ethernet NICs 246
- R-Studio Manual243 248
- R-Studio Manual247 252
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