Core Function BinaryMidReplace
(Created page with "<pre> BinaryMidReplace( <binary-array>, <replacement>, <start>, <length> ) </pre> === Description === Replace a section (from start to length) of the binary with the replacemen...") |
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Revision as of 23:21, 1 August 2014
BinaryMidReplace( <binary-array>, <replacement>, <start>, <length> )
Contents |
Description
Replace a section (from start to length) of the binary with the replacement binary.
Parameters
binary-array
The binary variable to use.
replacement
A variable to replace the section with
(If it is not binary it will cast as binary for the replacement)
start
Position to start from.
If the start is a negative value the position will work backwards from the length of the binary.
length
Optional; How many bytes to remove.
Default is all remaining bytes;
If length is given and is negative, then that many bytes will be omitted from the end of binary (after the start position has been calculated when a start is negative).
If start denotes the position of this truncation or beyond, empty binary variable will be returned.
Return Value
Success: Returns true.
Failure: Returns false (On error or if there was no bytes were added).
Remarks
None.
Example
Remove everything after position 2 then insert the replacement
// Create the binary $a = Pack("A*", "Hello World!"); // Create the replacement binary $b = Pack("A*", "CatDog"); // Print it say "Before:"; say BinaryExpand($a); // Remove bytes and insert in its place BinaryMidReplace($a, $b, 2); // Print result say "After:"; say BinaryExpand($a); // Prints: // Before: // 00 | 48 65 6C 6C 6F 20 57 6F 72 6C 64 21 -- -- -- -- Hello World! // After: // 00 | 48 65 43 61 74 44 6F 67 -- -- -- -- -- -- -- -- HeCatDog
Remove 3 bytes after position 2 then insert the replacement
// Create the binary $a = Pack("A*", "Hello World!"); // Create the replacement binary $b = Pack("A*", "CatDog"); // Print it say "Before:"; say BinaryExpand($a); // Remove bytes and insert in its place BinaryMidReplace($a, $b, 2, 3); // Print result say "After:"; say BinaryExpand($a); // Prints: // Before: // 00 | 48 65 6C 6C 6F 20 57 6F 72 6C 64 21 -- -- -- -- Hello World! // After: // 00 | 48 65 43 61 74 44 6F 67 20 57 6F 72 6C 64 21 -- HeCatDog World!
Remove the last 3 bytes then insert the replacement
// Create the binary $a = Pack("A*", "Hello World!"); // Create the replacement binary $b = Pack("A*", "CatDog"); // Print it say "Before:"; say BinaryExpand($a); // Remove bytes and insert in its place BinaryMidReplace($a, $b, -3); // Print result say "After:"; say BinaryExpand($a); // Prints: // Before: // 00 | 48 65 6C 6C 6F 20 57 6F 72 6C 64 21 -- -- -- -- Hello World! // After: // 00 | 48 65 6C 6C 6F 20 57 6F 72 43 61 74 44 6F 67 -- Hello WorCatDog
At the end
// Create the binary $a = Pack("A*", "Test"); // Create the replacement binary $b = Pack("A*", "CatDog"); // Print it say "Before:"; say BinaryExpand($a); // Remove bytes and insert in its place BinaryMidReplace($a, $b, 4); // Print result say "After:"; say BinaryExpand($a); // Prints: // Before: // 00 | 48 65 6C 6C 6F 20 57 6F 72 6C 64 21 -- -- -- -- Hello World! // After: // 00 | 54 65 73 74 43 61 74 44 6F 67 -- -- -- -- -- -- TestCatDog
At the beginning
// Create the binary $a = Pack("A*", "Test"); // Create the replacement binary $b = Pack("A*", "CatDog"); // Print it say "Before:"; say BinaryExpand($a); // Remove bytes and insert in its place BinaryMidReplace($a, $b, 0); // Print result say "After:"; say BinaryExpand($a); // Prints: // Before: // 00 | 48 65 6C 6C 6F 20 57 6F 72 6C 64 21 -- -- -- -- Hello World! // After: // 00 | 3 61 74 44 6F 67 -- -- -- -- -- -- -- -- -- -- CatDog
