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

• CryptX

• https://en.wikipedia.org/wiki/Cyclic_redundancy_check

cpanm CryptX

perl -MCPAN -e shell
install CryptX