Crypt::Checksum::CRC32(3)
NAME
Crypt::Checksum::CRC32 - Compute CRC32 checksum
SYNOPSIS
### Functional interface:
use Crypt::Checksum::CRC32 ':all';
# calculate CRC32 checksum from string/buffer
$checksum_raw = crc32_data($data);
$checksum_hex = crc32_data_hex($data);
$checksum_int = crc32_data_int($data);
# calculate CRC32 checksum from file
$checksum_raw = crc32_file('filename.dat');
$checksum_hex = crc32_file_hex('filename.dat');
$checksum_int = crc32_file_int('filename.dat');
# calculate CRC32 checksum from filehandle
$checksum_raw = crc32_file(*FILEHANDLE);
$checksum_hex = crc32_file_hex(*FILEHANDLE);
$checksum_int = crc32_file_int(*FILEHANDLE);
### OO interface:
use Crypt::Checksum::CRC32;
$d = Crypt::Checksum::CRC32->new;
$d->add('any data');
$d->add('another data');
$d->addfile('filename.dat');
$d->addfile(*FILEHANDLE);
$checksum_raw = $d->digest; # raw 4 bytes
$checksum_hex = $d->hexdigest; # hexadecimal form
$checksum_int = $d->intdigest; # 32bit unsigned integer
DESCRIPTION
Calculating CRC32 checksums.
Updated: v0.057
EXPORT
Nothing is exported by default.
You can export selected functions:
use Crypt::Checksum::CRC32 qw(crc32_data crc32_data_hex crc32_data_int crc32_file crc32_file_hex crc32_file_int);
Or all of them at once:
use Crypt::Checksum::CRC32 ':all';
FUNCTIONS
crc32_data
Returns checksum as raw octects.
$checksum_raw = crc32_data('data string');
#or
$checksum_raw = crc32_data('any data', 'more data', 'even more data');
crc32_data_hex
Returns checksum as a hexadecimal string.
$checksum_hex = crc32_data_hex('data string');
#or
$checksum_hex = crc32_data_hex('any data', 'more data', 'even more data');
crc32_data_int
Returns checksum as unsigned 32bit integer.
$checksum_int = crc32_data_int('data string');
#or
$checksum_int = crc32_data_int('any data', 'more data', 'even more data');
crc32_file
Returns checksum as raw octects.
$checksum_raw = crc32_file('filename.dat');
#or
$checksum_raw = crc32_file(*FILEHANDLE);
crc32_file_hex
Returns checksum as a hexadecimal string.
$checksum_hex = crc32_file_hex('filename.dat');
#or
$checksum_hex = crc32_file_hex(*FILEHANDLE);
crc32_file_int
Returns checksum as unsigned 32bit integer.
$checksum_int = crc32_file_int('filename.dat');
#or
$checksum_int = crc32_file_int(*FILEHANDLE);
METHODS
new
Constructor, returns a reference to the checksum object.
$d = Crypt::Checksum::CRC32->new;
clone
Creates a copy of the checksum object state and returns a reference to
the copy.
$d->clone();
reset
Reinitialize the checksum object state and returns a reference to the
checksum object.
$d->reset();
add
All arguments are appended to the message we calculate checksum for.
The return value is the checksum object itself.
$d->add('any data');
#or
$d->add('any data', 'more data', 'even more data');
addfile
The content of the file (or filehandle) is appended to the message we
calculate checksum for. The return value is the checksum object
itself.
$d->addfile('filename.dat');
#or
$d->addfile(*FILEHANDLE);
BEWARE: You have to make sure that the filehandle is in binary mode
before you pass it as argument to the addfile() method.
digest
Returns the binary checksum (raw bytes).
$result_raw = $d->digest();
hexdigest
Returns the checksum encoded as a hexadecimal string.
$result_hex = $d->hexdigest();
intdigest
Returns the checksum encoded as unsigned 32bit integer.
$result_int = $d->intdigest();
SEE ALSO
o CryptX(3)
o <https://en.wikipedia.org/wiki/Cyclic_redundancy_check>
perl v5.30.3 2022-01-07 Crypt::Checksum::CRC32(3)
cryptx 0.76.0 - Generated Mon Feb 14 06:15:01 CST 2022