Read binary file with known structure
Hello,
I have to get a string from binary file. But to get it have to parse the file. Fortunately it's structure is known, but some parts size defined by integer numbers in the file. So it goes like this:
integer (4 bytes, little-endian)
integer
unsigned short (2 bytes)
unsigned short
integer
char [length defined by the integer above]
integer
char [length defined by the integer above]
...
...
I need to get the last string of chars above (it's not the last in the file).
My problem is I cannot get integers out of binary stream to determine the size of string after it.
Would you help please? Please use only standard Perl, no libraries.
I have to get a string from binary file. But to get it have to parse the file. Fortunately it's structure is known, but some parts size defined by integer numbers in the file. So it goes like this:
integer (4 bytes, little-endian)
integer
unsigned short (2 bytes)
unsigned short
integer
char [length defined by the integer above]
integer
char [length defined by the integer above]
...
...
I need to get the last string of chars above (it's not the last in the file).
My problem is I cannot get integers out of binary stream to determine the size of string after it.
Would you help please? Please use only standard Perl, no libraries.
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I heard I should use unpack, but could not understand how to use it. You made my day. Thanks!