Difference between revisions of "Bset"
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The bset command is used to set a [[Binary Files|binary file]]. | The bset command is used to set a [[Binary Files|binary file]]. | ||
<nowiki>bset [-t] <&binvar> <N> <asciivalue> [asciivalue ... asciivalue]</nowiki> | <nowiki>bset [-t] <&binvar> <N> <asciivalue> [asciivalue ... asciivalue]</nowiki> | ||
| − | This sets the Nth byte of the binary file &binvar to the asciivalues. All asciivalues after are set to positions after the Nth byte. | + | This sets the Nth byte of the binary file &binvar to the [[$asc|asciivalues]]. All asciivalues after are set to positions after the Nth byte. |
If you set a binary file that doesn't exist yet, the file will be created and zero filled to the Nth byte. If you set a binary file that already exists and is smaller then N bytes, it will be extended with zeros to the Nth byte. | If you set a binary file that doesn't exist yet, the file will be created and zero filled to the Nth byte. If you set a binary file that already exists and is smaller then N bytes, it will be extended with zeros to the Nth byte. | ||
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bset -t &test 1 just a test | bset -t &test 1 just a test | ||
echo -a $bvar(&test,1,$bvar(&test,0)) | echo -a $bvar(&test,1,$bvar(&test,0)) | ||
| − | Using the -t switch the text will be converted to asciivalues and set to the binary file. The echo will return: 106 117 115 116 32 97 32 116 101 115 116. Which are the | + | Using the -t switch the text will be converted to asciivalues and set to the binary file. The echo will return: 106 117 115 116 32 97 32 116 101 115 116. Which are the asciivalues of the text "just a test" |
[[Category:Binary Files]] | [[Category:Binary Files]] | ||
[[Category:Commands]] | [[Category:Commands]] | ||
Revision as of 15:57, 13 September 2006
The bset command is used to set a binary file.
bset [-t] <&binvar> <N> <asciivalue> [asciivalue ... asciivalue]
This sets the Nth byte of the binary file &binvar to the asciivalues. All asciivalues after are set to positions after the Nth byte. If you set a binary file that doesn't exist yet, the file will be created and zero filled to the Nth byte. If you set a binary file that already exists and is smaller then N bytes, it will be extended with zeros to the Nth byte.
The -t switch indicates that bset should treat the values as plain text and copy them directly into the binary file.
Examples
bset &test 1 65
Now &test is filled with 1 byte, and it containes asciivalue 65 wich is "A".
bset &test 5 65
In this case we only set one asciivalue at the 5th place, but the first 4 bytes are filled with zeros.
bset &test 1 65 bset &test 5 66 echo -a $bvar(&test,1,5)
Now we first set 65 at byte one, then set 66 at byte 5. With this second set, bytes 2 to 4 were filled with zeros. The echo will return: 65 0 0 0 66
bset -t &test 1 just a test echo -a $bvar(&test,1,$bvar(&test,0))
Using the -t switch the text will be converted to asciivalues and set to the binary file. The echo will return: 106 117 115 116 32 97 32 116 101 115 116. Which are the asciivalues of the text "just a test"
