| Version 49 (modified by os, 11 years ago) (diff) |
|---|
Programming Languages
Hash code is based on Media Player Classic. In natural language it calculates: size + 64bit chksum of the first and last 64k (even if they overlap because the file is smaller than 128k). On opensubtitles.org is movie file size limited to 9000000000 > $moviebytesize > 131072 bytes, if is there any reason to change these sizes, let us know. Licence of hashing source codes is GPL. Source codes was tested on Little Endian - DEC, Intel and compatible
Feel free to edit/add source-codes if you have faster/better implementation. Also don't forget to check, if hash is right for test. Test these 2 files please to ensure your algo is completely OK:
- AVI file (12 909 756 bytes)
- hash: 8e245d9679d31e12
- DUMMY RAR file (2 565 922 bytes, 4 295 033 890 after RAR unpacking, test on UNPACKED file)
- hash: 61f7751fc2a72bfb (for UNPACKED file)
C
#include <stdio.h> #include <stdlib.h> #define MAX(x,y) (((x) > (y)) ? (x) : (y)) #ifndef uint64_t #define uint64_t unsigned long long #endif uint64_t compute_hash(FILE * handle) { uint64_t hash, fsize; fseek(handle, 0, SEEK_END); fsize = ftell(handle); fseek(handle, 0, SEEK_SET); hash = fsize; for(uint64_t tmp = 0, i = 0; i < 65536/sizeof(tmp) && fread((char*)&tmp, sizeof(tmp), 1, handle); hash += tmp, i++); fseek(handle, (long)MAX(0, fsize - 65536), SEEK_SET); for(uint64_t tmp = 0, i = 0; i < 65536/sizeof(tmp) && fread((char*)&tmp, sizeof(tmp), 1, handle); hash += tmp, i++); return hash; } int main(int argc, char *argv) { FILE * handle; uint64_t myhash; handle = fopen("breakdance.avi", "rb"); if (!handle) { printf("Error openning file!"); return 1; } myhash = compute_hash(handle); printf("%I64x", myhash); fclose(handle); return 0; }
C - Public Domain License
#include <stdio.h> #include <stdlib.h> unsigned long long analizefileOSHahs(char *fileName){ /* * Public Domain implementation by Kamil Dziobek. turbos11(at)gmail.com * This code implements Gibest hash algorithm first use in Media Player Classics * For more implementation(various languages and authors) see: * http://trac.opensubtitles.org/projects/opensubtitles/wiki/HashSourceCodes * * -works only on little-endian procesor DEC, Intel and compatible * -sizeof(unsigned long long) must be 8 */ FILE *file; int i; unsigned long long t1=0; unsigned long long buffer1[8192*2]; file = fopen(fileName, "rb"); fread(buffer1, 8192, 8, file); fseek(file, -65536, SEEK_END); fread(&buffer1[8192], 8192, 8, file); for (i=0;i<8192*2;i++) t1+=buffer1[i]; t1+= ftell(file); //add filesize fclose(file); return t1; }; int main(int argc, char *argv){ unsigned long long myhash=analizefileOSHahs("C://tomaszkokowskizoofiliamovies.avi"); printf("hash is %16I64x",myhash); }
C++
#include <iostream> #include <fstream> typedef unsigned __int64 uint64_t; using namespace std; int MAX(int x, int y) { if((x) > (y)) return x; else return y; } uint64_t compute_hash(ifstream& f) { uint64_t hash, fsize; f.seekg(0, ios::end); fsize = f.tellg(); f.seekg(0, ios::beg); hash = fsize; for(uint64_t tmp = 0, i = 0; i < 65536/sizeof(tmp) && f.read((char*)&tmp, sizeof(tmp)); i++, hash += tmp); f.seekg(MAX(0, (uint64_t)fsize - 65536), ios::beg); for(tmp = 0, i = 0; i < 65536/sizeof(tmp) && f.read((char*)&tmp, sizeof(tmp)); i++, hash += tmp); return hash; } int main(int argc, char *argv) { ifstream f; uint64_t myhash; f.open("c:\\test.avi", ios::in|ios::binary|ios::ate); if (!f.is_open()) { cerr << "Error opening file" << endl; return 1; } myhash = compute_hash(f); cout << setw(16) << setfill('0') << hex << myhash; f.close(); return 0; }
About C and C++ implementation
This only work on little-endian processor: DEC, Intel and compatible
Java
/** * Hash code is based on Media Player Classic. In natural language it calculates: size + 64bit * checksum of the first and last 64k (even if they overlap because the file is smaller than * 128k). */ public class OpenSubtitlesHasher { /** * Size of the chunks that will be hashed in bytes (64 KB) */ private static final int HASH_CHUNK_SIZE = 64 * 1024; public static String computeHash(File file) throws IOException { long size = file.length(); long chunkSizeForFile = Math.min(HASH_CHUNK_SIZE, size); FileChannel fileChannel = new FileInputStream(file).getChannel(); try { long head = computeHashForChunk(fileChannel.map(MapMode.READ_ONLY, 0, chunkSizeForFile)); long tail = computeHashForChunk(fileChannel.map(MapMode.READ_ONLY, Math.max(size - HASH_CHUNK_SIZE, 0), chunkSizeForFile)); return String.format("%016x", size + head + tail); } finally { fileChannel.close(); } } public static String computeHash(InputStream stream, long length) throws IOException { int chunkSizeForFile = (int) Math.min(HASH_CHUNK_SIZE, length); // buffer that will contain the head and the tail chunk, chunks will overlap if length is smaller than two chunks byte[] chunkBytes = new byte[(int) Math.min(2 * HASH_CHUNK_SIZE, length)]; DataInputStream in = new DataInputStream(stream); // first chunk in.readFully(chunkBytes, 0, chunkSizeForFile); long position = chunkSizeForFile; long tailChunkPosition = length - chunkSizeForFile; // seek to position of the tail chunk, or not at all if length is smaller than two chunks while (position < tailChunkPosition && (position += in.skip(tailChunkPosition - position)) >= 0); // second chunk, or the rest of the data if length is smaller than two chunks in.readFully(chunkBytes, chunkSizeForFile, chunkBytes.length - chunkSizeForFile); long head = computeHashForChunk(ByteBuffer.wrap(chunkBytes, 0, chunkSizeForFile)); long tail = computeHashForChunk(ByteBuffer.wrap(chunkBytes, chunkBytes.length - chunkSizeForFile, chunkSizeForFile)); return String.format("%016x", length + head + tail); } private static long computeHashForChunk(ByteBuffer buffer) { LongBuffer longBuffer = buffer.order(ByteOrder.LITTLE_ENDIAN).asLongBuffer(); long hash = 0; while (longBuffer.hasRemaining()) { hash += longBuffer.get(); } return hash; } }
C#
You can use GetHash?.dll.
http://trac.opensubtitles.org/projects/opensubtitles/attachment/wiki/HashSourceCodes/GetHash.dll
Use Example:
private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
{
byte[] hash = GetHash.Main.ComputeHash(openFileDialog1.FileName);
label1.Text = GetHash.Main.ToHexadecimal(hash);
}
or without using GetHash?.dll:
using System; using System.Text; using System.IO; namespace MovieHasher { class Program { private static byte[] ComputeMovieHash(string filename) { byte[] result; using (Stream input = File.OpenRead(filename)) { result = ComputeMovieHash(input); } return result; } private static byte[] ComputeMovieHash(Stream input) { long lhash, streamsize; streamsize = input.Length; lhash = streamsize; long i = 0; byte[] buffer = new byte[sizeof(long)]; while (i < 65536 / sizeof(long) && (input.Read(buffer, 0, sizeof(long)) > 0)) { i++; lhash += BitConverter.ToInt64(buffer, 0); } input.Position = Math.Max(0, streamsize - 65536); i = 0; while (i < 65536 / sizeof(long) && (input.Read(buffer, 0, sizeof(long)) > 0)) { i++; lhash += BitConverter.ToInt64(buffer, 0); } input.Close(); byte[] result = BitConverter.GetBytes(lhash); Array.Reverse(result); return result; } private static string ToHexadecimal(byte[] bytes) { StringBuilder hexBuilder = new StringBuilder(); for(int i = 0; i < bytes.Length; i++) { hexBuilder.Append(bytes[i].ToString("x2")); } return hexBuilder.ToString(); } static void Main(string[] args) { byte[] moviehash = ComputeMovieHash(@"C:\test.avi"); Console.WriteLine("The hash of the movie-file is: {0}", ToHexadecimal(moviehash)); } } }
If you get overflow error read this.
VB.Net
Imports System Imports System.Text Imports System.IO 'Note: you must remove integer overflow checking. Namespace MovieHasher Class Program Private Shared Function ComputeMovieHash(ByVal filename As String) As Byte() Dim result As Byte() Using input As Stream = File.OpenRead(filename) result = ComputeMovieHash(input) End Using Return result End Function Private Function ComputeMovieHash(ByVal input As Stream) As Byte() Dim lhash As System.Int64, streamsize As Long streamsize = input.Length lhash = streamsize Dim i As Long = 0 Dim buffer As Byte() = New Byte(Marshal.SizeOf(GetType(Long)) - 1) {} While i < 65536 / Marshal.SizeOf(GetType(Long)) AndAlso (input.Read(buffer, 0, Marshal.SizeOf(GetType(Long))) > 0) i += 1 lhash += BitConverter.ToInt64(buffer, 0) End While input.Position = Math.Max(0, streamsize - 65536) i = 0 While i < 65536 / Marshal.SizeOf(GetType(Long)) AndAlso (input.Read(buffer, 0, Marshal.SizeOf(GetType(Long))) > 0) i += 1 lhash += BitConverter.ToInt64(buffer, 0) End While input.Close() Dim result As Byte() = BitConverter.GetBytes(lhash) Array.Reverse(result) Return result End Function Private Shared Function ToHexadecimal(ByVal bytes As Byte()) As String Dim hexBuilder As New StringBuilder() For i As Integer = 0 To bytes.Length - 1 hexBuilder.Append(bytes(i).ToString("x2")) Next Return hexBuilder.ToString() End Function Private Shared Sub Main(ByVal args As String()) Dim moviehash As Byte() = ComputeMovieHash("C:\test.avi") Console.WriteLine("The hash of the movie-file is: {0}", ToHexadecimal(moviehash)) End Sub End Class End Namespace
Python
import struct, os def hashFile(name): try: longlongformat = 'q' # long long bytesize = struct.calcsize(longlongformat) f = open(name, "rb") filesize = os.path.getsize(name) hash = filesize if filesize < 65536 * 2: return "SizeError" for x in range(65536/bytesize): buffer = f.read(bytesize) (l_value,)= struct.unpack(longlongformat, buffer) hash += l_value hash = hash & 0xFFFFFFFFFFFFFFFF #to remain as 64bit number f.seek(max(0,filesize-65536),0) for x in range(65536/bytesize): buffer = f.read(bytesize) (l_value,)= struct.unpack(longlongformat, buffer) hash += l_value hash = hash & 0xFFFFFFFFFFFFFFFF f.close() returnedhash = "%016x" % hash return returnedhash except(IOError): return "IOError"
Delphi
This is just a quick conversion of Gabest's original C code. Anyone who can come up with a cleaner code, please feel free to do so and post here.
function CalcGabestHash(const fname: string): string;
var
i : integer;
s : array[1..8] of char;
tmp : Int64 absolute s;
hash : Int64;
readed : integer;
aStream: TFileStream;
begin
result := '';
if not FileExists(fname) then Exit;
aStream := TFileStream.Create(fName, fmShareDenyNone);
hash := aStream.Size;
i := 0; readed := 1;
while ((i < 8192) and (readed > 0)) do begin
readed := aStream.Read(s, sizeof(s));
if readed > 0 then
begin
hash := hash + tmp;
end;
i := i + 1;
end;
aStream.Seek(-65536, soFromEnd); // 65536
i := 0; readed:= 1;
while ((i < 8192) and (readed > 0)) do begin
readed := aStream.Read(s, sizeof(s));
if readed > 0 then
hash := hash + tmp;
i := i + 1;
end;
aStream.Free;
result := Format('%.16x',[hash]);
end;
alternate version by TRP
unction CalcGabestHash(const Stream: TStream): Int64; overload;
const HashPartSize = 1 shl 16; // 64 KiB
procedure UpdateHashFromStream(const Stream: TStream; var Hash:
Int64); inline;
var buffer: Array[0..HashPartSize div SizeOf(Int64) - 1] of Int64;
i : integer;
begin
Stream.ReadBuffer(buffer[0], SizeOf(buffer));
for i := Low(buffer) to High(buffer) do
Inc(Hash, buffer[i]);
end;
begin
result:= Stream.Size;
if result < HashPartSize then
begin
// stream too small return invalid hash
result:= 0;
exit;
end;
// first 64 KiB
Stream.Position:= 0;
UpdateHashFromStream(Stream, result);
// last 64 KiB
Stream.Seek(-HashPartSize, soEnd);
UpdateHashFromStream(Stream, result);
// use "IntToHex(result, 16);" to get a string and "StrToInt64('$' +
hash);" to get your Int64 back
end;
function CalcGabestHash(const FileName: TFileName): Int64; overload;
var stream: TStream;
begin
stream:= TFileStream.Create(FileName, fmOpenRead or fmShareDenyWrite);
try
result:= CalcGabestHash(stream);
finally
stream.Free;
end;
end;
Lua
-- will produce a correct hash regardless of architecture (big vs little endian) local function movieHash(fileName) local fil = io.open(fileName, "rb") local lo,hi=0,0 for i=1,8192 do local a,b,c,d = fil:read(4):byte(1,4) lo = lo + a + b*256 + c*65536 + d*16777216 a,b,c,d = fil:read(4):byte(1,4) hi = hi + a + b*256 + c*65536 + d*16777216 while lo>=4294967296 do lo = lo-4294967296 hi = hi+1 end while hi>=4294967296 do hi = hi-4294967296 end end local size = fil:seek("end", -65536) + 65536 for i=1,8192 do local a,b,c,d = fil:read(4):byte(1,4) lo = lo + a + b*256 + c*65536 + d*16777216 a,b,c,d = fil:read(4):byte(1,4) hi = hi + a + b*256 + c*65536 + d*16777216 while lo>=4294967296 do lo = lo-4294967296 hi = hi+1 end while hi>=4294967296 do hi = hi-4294967296 end end lo = lo + size while lo>=4294967296 do lo = lo-4294967296 hi = hi+1 end while hi>=4294967296 do hi = hi-4294967296 end fil:close() return string.format("%08x%08x", hi,lo), size end print("breakdance.avi:") print(movieHash("breakdance.avi")) print("8e245d9679d31e12 <- should be") print("") print("dummy.rar:") print(movieHash("dummy.rar")) print("61f7751fc2a72bfb <- should be according to wiki") print("2a527d74d45f5b1b <- what other hash tools actually report")
RealBasic
Combined routine that will calculate a fast hash for videofiles over 65K and a normal md5 for subtitles
dim b as BinaryStream
dim mb as MemoryBlock
dim hash,bytesize as UINT64
dim i, x, chunksize, filelen, difference as integer
hash = 0 //Reset Hash
difference = 0
if f <> nil and f.Exists then
b= f.OpenAsBinaryFile
hash = b.Length
bytesize = b.Length
bytesizestr = str(bytesize)
if bytesize >= 65536 and routine = "video" then
chunksize = 65536
mb = b.Read(65536)
mb.LittleEndian = True
for i= 0 to chunksize -1 step 8
hash = hash+ mb.UINT64Value(i)
next
b.Position = max(b.Length-chunksize, 0)
mb= b.Read(chunksize)
mb.LittleEndian = True
for i= 0 to chunksize -1 step 8
hash = hash+ mb.UINT64Value(i)
next
myhash = Lowercase(str(hex(hash)))
elseif routine = "subtitle" then
dim c,result as string
mb = md5(b.Read(b.Length))
mb.LittleEndian = True
for i = 0 to mb.size-1
x = mb.byte( i )
c = right( "00"+hex( x ), 2 )
result = result + c
next
result = lowercase( result )
myhash = result
end
PHP 4/5
function OpenSubtitlesHash($file)
{
$handle = fopen($file, "rb");
$fsize = filesize($file);
$hash = array(3 => 0,
2 => 0,
1 => ($fsize >> 16) & 0xFFFF,
0 => $fsize & 0xFFFF);
for ($i = 0; $i < 8192; $i++)
{
$tmp = ReadUINT64($handle);
$hash = AddUINT64($hash, $tmp);
}
$offset = $fsize - 65536;
fseek($handle, $offset > 0 ? $offset : 0, SEEK_SET);
for ($i = 0; $i < 8192; $i++)
{
$tmp = ReadUINT64($handle);
$hash = AddUINT64($hash, $tmp);
}
fclose($handle);
return UINT64FormatHex($hash);
}
function ReadUINT64($handle)
{
$u = unpack("va/vb/vc/vd", fread($handle, 8));
return array(0 => $u["a"], 1 => $u["b"], 2 => $u["c"], 3 => $u["d"]);
}
function AddUINT64($a, $b)
{
$o = array(0 => 0, 1 => 0, 2 => 0, 3 => 0);
$carry = 0;
for ($i = 0; $i < 4; $i++)
{
if (($a[$i] + $b[$i] + $carry) > 0xffff )
{
$o[$i] += ($a[$i] + $b[$i] + $carry) & 0xffff;
$carry = 1;
}
else
{
$o[$i] += ($a[$i] + $b[$i] + $carry);
$carry = 0;
}
}
return $o;
}
function UINT64FormatHex($n)
{
return sprintf("%04x%04x%04x%04x", $n[3], $n[2], $n[1], $n[0]);
}
Perl
#!/usr/bin/perl use strict; use warnings; print OpenSubtitlesHash('breakdance.avi'); sub OpenSubtitlesHash { my $filename = shift or die("Need video filename"); open my $handle, "<", $filename or die $!; binmode $handle; my $fsize = -s $filename; my $hash = [$fsize & 0xFFFF, ($fsize >> 16) & 0xFFFF, 0, 0]; $hash = AddUINT64($hash, ReadUINT64($handle)) for (1..8192); my $offset = $fsize - 65536; seek($handle, $offset > 0 ? $offset : 0, 0) or die $!; $hash = AddUINT64($hash, ReadUINT64($handle)) for (1..8192); close $handle or die $!; return UINT64FormatHex($hash); } sub ReadUINT64 { read($_[0], my $u, 8); return [unpack("vvvv", $u)]; } sub AddUINT64 { my $o = [0,0,0,0]; my $carry = 0; for my $i (0..3) { if (($_[0]->[$i] + $_[1]->[$i] + $carry) > 0xffff ) { $o->[$i] += ($_[0]->[$i] + $_[1]->[$i] + $carry) & 0xffff; $carry = 1; } else { $o->[$i] += ($_[0]->[$i] + $_[1]->[$i] + $carry); $carry = 0; } } return $o; } sub UINT64FormatHex { return sprintf("%04x%04x%04x%04x", $_[0]->[3], $_[0]->[2], $_[0]->[1], $_[0]->[0]); }
Ruby
This is a quick translation/transliteration of the Perl script.
class Hasher def open_subtitles_hash(filename) raise "Need video filename" unless filename fh = File.open(filename) fsize = File.size(filename) hash = [fsize & 0xffff, (fsize >> 16) & 0xffff, 0, 0] 8192.times { hash = add_unit_64(hash, read_uint_64(fh)) } offset = fsize - 65536 fh.seek([0,offset].max, 0) 8192.times { hash = add_unit_64(hash, read_uint_64(fh)) } fh.close return uint_64_format_hex(hash) end def read_uint_64(stream) stream.read(8).unpack("vvvv") end def add_unit_64(hash, input) res = [0,0,0,0] carry = 0 hash.zip(input).each_with_index do |(h,i),n| sum = h + i + carry if sum > 0xffff res[n] += sum & 0xffff carry = 1 else res[n] += sum carry = 0 end end return res end def uint_64_format_hex(hash) sprintf("%04x%04x%04x%04x", *hash.reverse) end end if __FILE__ == $0 require 'test/unit' class HashTester < Test::Unit::TestCase def setup @h = Hasher.new end def test_test_file_hash assert_equal("8e245d9679d31e12", @h.open_subtitles_hash('breakdance.avi')) end end end
Another more "rubyesque" implementation.
module MovieHasher CHUNK_SIZE = 64 * 1024 # in bytes def self.compute_hash(filename) filesize = File.size(filename) hash = filesize # Read 64 kbytes, divide up into 64 bits and add each # to hash. Do for beginning and end of file. File.open(filename, 'rb') do |f| # Q = unsigned long long = 64 bit f.read(CHUNK_SIZE).unpack("Q*").each do |n| hash = hash + n & 0xffffffffffffffff # to remain as 64 bit number end f.seek([0, filesize - CHUNK_SIZE].max, IO::SEEK_SET) # And again for the end of the file f.read(CHUNK_SIZE).unpack("Q*").each do |n| hash = hash + n & 0xffffffffffffffff end end sprintf("%016x", hash) end end if __FILE__ == $0 require 'test/unit' class MovieHasherTest < Test::Unit::TestCase def test_compute_hash assert_equal("8e245d9679d31e12", MovieHasher::compute_hash('breakdance.avi')) end def test_compute_hash_large_file assert_equal("61f7751fc2a72bfb", MovieHasher::compute_hash('dummy.bin')) end end end
Haskell
import IO(bracket) import System.Environment(getArgs) import System.IO(openBinaryFile,hClose,hFileSize,hSeek,IOMode(ReadMode),SeekMode(AbsoluteSeek,SeekFromEnd)) import qualified Data.ByteString.Lazy as L(hGet,unpack) import Data.Binary.Get(runGet,getWord64le) import Data.Binary.Put(runPut,putWord64le) import Data.Word(Word64) import Control.Monad(foldM) import Data.Bits.Utils(w82s) import Data.Hex(hex) shortsum :: FilePath -> IO Word64 shortsum filename = bracket (openBinaryFile filename ReadMode) hClose $ \h -> do fs <- hFileSize h hSeek h AbsoluteSeek 0 ; begin <- L.hGet h chunksize hSeek h SeekFromEnd (-(toInteger chunksize)) ; end <- L.hGet h chunksize return $ (flip runGet $ begin) $ chunksum $ (flip runGet $ end) (chunksum . fromInteger $ fs) where chunksize = 0x10000 chunksum n = foldM (\a _ -> getWord64le >>= return . (+a)) n [1..(chunksize`div`8)] main :: IO () main = do args <- getArgs let fn = head $ args p <- shortsum fn putStrLn $ "The hash of file " ++ fn ++ ": " ++ (hex $ w82s $ reverse (L.unpack $ runPut $ putWord64le p))
AutoIT
#cs
Hash code is based on Media Player Classic. It calculates: size + 64bit
checksum of the first and last 64k (even if they overlap because the file is smaller than 128k).
Authors: Authenticity & Emanuel "Datenshi" Lindgren @ AutoIT Forums.
AutoIT v3.3.2.0
#ce
Func _Compute_Hash($sFileName)
Local $hFile, $tRet, $tTmp, $iFileSize, $iRead, $iChunk, $iI
$hFile = FileOpen($sFileName, 16)
If Not $hFile Then Return SetError(1, 0, 0)
$iFileSize = FileGetSize($sFileName)
$iChunk = 65536
If $iFileSize < $iChunk * 2 Then
FileClose($hFile)
Return SetError(2, 0, 0)
EndIf
$tRet = DllStructCreate("uint64")
$tTmp = DllStructCreate("uint64")
DllStructSetData($tRet, 1, $iFileSize)
For $iI = 0 To ($iChunk / 8) - 1
DllStructSetData($tTmp, 1, FileRead($hFile, 8))
DllStructSetData($tRet, 1, DllStructGetData($tRet, 1) + DllStructGetData($tTmp, 1))
Next
FileSetPos($hFile, $iFileSize - $iChunk, 0)
For $iI = 0 To ($iChunk / 8) - 1
DllStructSetData($tTmp, 1, FileRead($hFile, 8))
DllStructSetData($tRet, 1, DllStructGetData($tRet, 1) + DllStructGetData($tTmp, 1))
Next
FileClose($hFile)
Return SetError(0, 0, _HEX(DllStructGetData($tRet, 1)))
EndFunc
Func _HEX($iValue)
Return StringFormat("%#.8x%.8x", $iValue / 4294967296, $iValue)
EndFunc
FoxPro
PARAMETERS cfile
PRIVATE ALL
*******
* enviroment setup
*******
cret=''
glTalk=(SET("TALK")="ON")
IF vartype(cfile)<>'C'
cfile='breakdance.avi'
ENDIF
IF glTalk
? cfile
? cfile=''
? LEN(cfile)
endif
nfile=FOPEN(cfile)
nsize=FSEEK(nfile,0,2)
IF gltalk
? cfile
? 'size?>'
?? nsize
endif
FSEEK(nfile,0,0)
******
* length reencode to 64 uint
*****
chash=hashsize(nsize)
cempty=chr(0)
cret=''
IF LEN(chash)<8
FOR i=1 TO 8-LEN(chash)
cret=cret+cempty
ENDFOR
ENDIF
cret=cret+chash
nSum=0
*******
* first 64kb
******
FOR i=1 TO 8192
cpom=FREAD(nfile,8)
cpom=reverse(cpom)
nSum=nSum+LEN(cpom)
IF gltalk
do buildhex WITH cret
?? '+'
DO buildhex WITH cpom
? '='
ENDIF
cret=adint64(cret,cpom)
ENDFOR
*******
* last 64kb
*******
FSEEK(nfile,-65536,2)
FOR i=1 TO 8192
cpom=FREAD(nfile,8)
cpom=reverse(cpom)
cret=adint64(cret,cpom)
nSum=nSum+LEN(cpom)
ENDFOR
FCLOSE(nfile)
****
* build hexa
****
IF gltalk
DO buildhex WITH cret
?
? 'Spocital som'
?? nSum
ENDIF
RETURN buildhex(cret)
FUNCTION reverse
PARAMETERS cstring
PRIVATE ALL
cret=''
FOR i=1 TO LEN(cstring)
cret=cret+SUBSTR(cstring,LEN(cstring)-i+1,1)
ENDFOR
RETURN cret
FUNCTION buildhex
PARAMETERS cstring,lkam
PRIVATE ALL
gcTalk=SET("TALK")
cret=''
FOR i=1 TO LEN(cstring)
cpom=dec2basx(ASC(SUBSTR(cstring,i,1)),16)
IF LEN(cpom)<2
cout='0'+cpom
cpom=cout
ENDIF
cret=cret+cpom
IF gcTALK="ON"
?? cpom
?? ':'
ENDIF
ENDFOR
RETURN cret
FUNCTION adint64
PARAMETERS cstring1,cstring2
PRIVATE ALL
DIMENSION car (8,1) as Character
***
* 8 bytes both
***
nincrement=0
cret=''
FOR i=8 TO 1 STEP -1
nfir=ASC(SUBSTR(cstring1,i,1))
nsec=ASC(SUBSTR(cstring2,i,1))
nout=nincrement+nfir+nsec
IF nout>255
nincrement=INT(nout/256)
nout=nout-(nincrement*256)
ELSE
nincrement=0
ENDIF
car(i)=CHR(nout)
ENDFOR
FOR i=1 TO 8
cret=cret+car(i)
ENDFOR
RETURN cret
FUNCTION hashsize
PARAMETERS ncislo
PRIVATE ALL
cret=''
creverse=''
DO WHILE .t.
npom=INT(ncislo/256)
npom2=ncislo-npom*256
creverse=creverse+CHR(npom2)
ncislo=npom
IF ncislo=0
EXIT
ENDIF
ENDDO
FOR i=1 TO LEN(creverse)
cret=cret+SUBSTR(creverse,LEN(creverse)-i+1,1)
ENDFOR
RETURN cret
*..............................................................................
* Function: DEC2BASX
* Purpose: Convert whole number 0-?, to base 2-16
*
* Parameters: nTempNum - number to convert (0-9007199254740992)
* base - base to convert to i.e., 2 4 8 16...
* returns: string
* Usage: cresult=Dec2BasX(nParm1, nParm2)
* STORE Dec2BasX(255, 16) TO cMyString &&... cMyString contains 'ff'
*..............................................................................
FUNCTION dec2basx
PARAMETERS nTempNum, nNewBase
STORE 0 TO nWorkVal,;
remainder,;
dividend,;
nextnum,;
digit
nWorkVal = nTempNum
ret_str = ''
DO WHILE .T.
digit = MOD(nWorkVal, nNewBase)
dividend = nWorkVal / nNewBase
nWorkVal = INT(dividend)
DO CASE
CASE digit = 10
ret_str = 'a' + ret_str
CASE digit = 11
ret_str = 'b' + ret_str
CASE digit = 12
ret_str = 'c' + ret_str
CASE digit = 13
ret_str = 'd' + ret_str
CASE digit = 14
ret_str = 'e' + ret_str
CASE digit = 15
ret_str = 'f' + ret_str
OTHERWISE
ret_str = LTRIM(STR(digit)) + ret_str
ENDCASE
IF nWorkVal = 0
EXIT
ENDIF ( nWorkVal = 0 )
ENDDO ( .T. )
RETURN ret_str
Powershell 2.0
You can use GetHash?.dll.
http://trac.opensubtitles.org/projects/opensubtitles/attachment/wiki/HashSourceCodes/GetHash.dll
Use Example:
Add-Type -Path "GetHash.dll"
function MovieHash([string]$path) {
$hash = [GetHash.Main]
$hash::ToHexadecimal($hash::ComputeHash($path))
}
MovieHash $filename
or without using GetHash?.dll:
$dataLength = 65536
function LongSum([UInt64]$a, [UInt64]$b) {
[UInt64](([Decimal]$a + $b) % ([Decimal]([UInt64]::MaxValue) + 1))
}
function StreamHash([IO.Stream]$stream) {
$hashLength = 8
[UInt64]$lhash = 0
[byte[]]$buffer = New-Object byte[] $hashLength
$i = 0
while ( ($i -lt ($dataLength / $hashLength)) -and ($stream.Read($buffer,0,$hashLength) -gt 0) ) {
$i++
$lhash = LongSum $lhash ([BitConverter]::ToUInt64($buffer,0))
}
$lhash
}
function MovieHash([string]$path) {
try {
$stream = [IO.File]::OpenRead($path)
[UInt64]$lhash = $stream.Length
$lhash = LongSum $lhash (StreamHash $stream)
$stream.Position = [Math]::Max(0L, $stream.Length - $dataLength)
$lhash = LongSum $lhash (StreamHash $stream)
"{0:X}" -f $lhash
}
finally { $stream.Close() }
}
MovieHash $filename
MASM
Calc_Hash proc uses esi ebx edx pFile:dword, pBuf:dword LOCAL hFile:dword, fSize:dword, NBR:dword, pMem:dword invoke CreateFile,pFile,GENERIC_ALL,0,0,OPEN_EXISTING,0,0 mov hFile,eax cmp eax,INVALID_HANDLE_VALUE jz @Error invoke SetFilePointer,hFile,0,NULL,FILE_END mov fSize,eax push eax invoke GlobalAlloc,GPTR,131072 mov pMem,eax invoke SetFilePointer,hFile,0,NULL,FILE_BEGIN invoke ReadFile,hFile,pMem,65536,addr NBR,NULL sub fSize,65536 add pMem,65536 invoke SetFilePointer,hFile,fSize,NULL,FILE_BEGIN invoke ReadFile,hFile,pMem,65536,addr NBR,NULL sub pMem,65536 mov esi,pMem mov ecx,131072 pop eax mov edx,eax push eax @@: add edx,[esi] adc ebx,[esi+4] add esi,8 sub ecx,8 jnz @B push edx push ebx invoke wsprintf,pBuf,addr HashFormat pop eax pop eax invoke CloseHandle,hFile invoke GlobalFree,pMem pop ecx @Error: ; If error eax returns (INVALID_HANDLE_VALUE) ; Hash value is copied to pBuf ; eax returns Movie Filesize ret Calc_Hash endp
Objective-C
This is implementation of hash for Objective-C for Mac by subsmarine.com
OSHashAlgorithm.m
#import "OSHashAlgorithm.h" @implementation OSHashAlgorithm +(NSString*)stringForHash:(uint64_t)hash { return [[NSString stringWithFormat:@"%qx", hash ] autorelease]; } +(VideoHash)hashForPath:(NSString*)path { VideoHash hash; hash.fileHash =0; hash.fileSize =0; NSFileHandle *readFile = [NSFileHandle fileHandleForReadingAtPath:path]; hash = [OSHashAlgorithm hashForFile:readFile]; [readFile closeFile]; return hash; } +(VideoHash)hashForURL:(NSURL*)url { VideoHash hash; hash.fileHash =0; hash.fileSize =0; NSFileHandle *readfile = [NSFileHandle fileHandleForReadingFromURL:url error:NULL]; hash = [OSHashAlgorithm hashForFile:readfile]; return hash; } +(VideoHash)hashForFile:(NSFileHandle*)handle { VideoHash retHash; retHash.fileHash =0; retHash.fileSize =0; if( handle == nil ) return retHash; const NSUInteger CHUNK_SIZE=65536; NSData *fileDataBegin, *fileDataEnd; uint64_t hash=0; fileDataBegin = [handle readDataOfLength:(NSUInteger)CHUNK_SIZE]; [handle seekToEndOfFile]; unsigned long long fileSize = [handle offsetInFile]; if(fileSize < CHUNK_SIZE ) return retHash; [handle seekToFileOffset:MAX(0,fileSize-CHUNK_SIZE) ]; fileDataEnd = [handle readDataOfLength:(NSUInteger)CHUNK_SIZE]; // // Calculate hash // // 1st. File size hash += fileSize; // 2nd. Begining data block uint64_t * data_bytes= (uint64_t*)[fileDataBegin bytes]; for( int i=0; i< CHUNK_SIZE/sizeof(uint64_t); i++ ) hash+=data_bytes[i];; // 3rd. Ending data block data_bytes= (uint64_t*)[fileDataEnd bytes]; for( int i=0; i< CHUNK_SIZE/sizeof(uint64_t); i++ ) hash+= data_bytes[i]; retHash.fileHash = hash; retHash.fileSize = fileSize; return retHash; } @end
OSHashAlgorithm.h
#import <Cocoa/Cocoa.h> typedef struct { uint64_t fileHash; uint64_t fileSize; } VideoHash; @interface OSHashAlgorithm : NSObject { } +(VideoHash)hashForPath:(NSString*)path; +(VideoHash)hashForURL:(NSURL*)url; +(VideoHash)hashForFile:(NSFileHandle*)handle; +(NSString*)stringForHash:(uint64_t)hash; @end
Vala
public uint64 hash(File file) {
try {
uint64 h;
//get filesize and add it to hash
var file_info = file.query_info("*", FileQueryInfoFlags.NONE);
h = file_info.get_size();
//add first 64kB of file to hash
var dis = new DataInputStream(file.read());
dis.set_byte_order(DataStreamByteOrder.LITTLE_ENDIAN);
for(int i=0; i<65536/sizeof(uint64); i++) {
h += dis.read_uint64();
}
//add last 64kB of file to hash
dis = new DataInputStream(file.read());
dis.set_byte_order(DataStreamByteOrder.LITTLE_ENDIAN);
dis.skip((size_t)(file_info.get_size() - 65536));
for(int i=0; i<65536/sizeof(uint64); i++) {
h += dis.read_uint64();
}
return h;
} catch (Error e) {
error("%s", e.message);
}
}
int main () {
var file = File.new_for_path ("breakdance.avi");
if (!file.query_exists ()) {
stderr.printf ("File '%s' doesn't exist.\n", file.get_path ());
return 1;
}
stdout.printf("%016llx\n", hash(file));
file = File.new_for_path ("dummy.bin");
if (!file.query_exists ()) {
stderr.printf ("File '%s' doesn't exist.\n", file.get_path ());
return 1;
}
stdout.printf("%016llx\n", hash(file));
return 0;
}
Build with: valac --pkg gio-2.0 hash.vala
AutoHotKey
#NoEnv
SetBatchLines, -1
; http://www.opensubti.../breakdance.avi
; OpenSubtitles Hash = 8E245D9679D31E12
FilePath := "Breakdance.avi"
MsgBox, 0, OpenSubtitlesHash, % Filepath . ":`r`n" . GetOpenSubtitlesHash(FilePath)
ExitApp
; ==================================================================================================
GetOpenSubtitlesHash(FilePath) {
; http://trac.opensubt...HashSourceCodes
Static X := { 0: "0", 1: "1", 2: "2", 3: "3", 4: "4", 5: "5", 6: "6", 7: "7"
, 8: "8", 9: "9", 10: "A", 11: "B", 12: "C", 13: "D", 14: "E", 15: "F"}
; Check the file size ---------------------------------------------------------------------------
; 9000000000 > $moviebytesize >= 131072 bytes (changed > to >= for the lower limit)
FileGetSize, FileSize, %FilePath%
If (FileSize < 131072) || (FileSize >= 9000000000)
Return ""
; Read the first and last 64 KB -----------------------------------------------------------------
VarSetCapacity(FileParts, 131072) ; allocate sufficient memory
File := FileOpen(FilePath, "r") ; open the file
File.Seek(0, 0) ; set the file pointer (just for balance)
File.RawRead(FileParts, 65536) ; read the first 64 KB
File.Seek(-65536, 2) ; set the file pointer for the last 64 KB
File.RawRead(&FileParts + 65536, 65536) ; read the last 64 KB
File.Close() ; got all we need, so the file can be closed
; Now calculate the hash using two UINTs for the low- and high-order parts of an UINT64 ---------
LoUINT := FileSize & 0xFFFFFFFF ; store low-order UINT of file size
HiUINT := FileSize >> 32 ; store high-order UINT of file size
Offset := -4 ; to allow adding 4 on first iteration
Loop, 16384 { ; 131072 / 8
LoUINT += NumGet(FileParts, Offset += 4, "UInt") ; add first UINT value to low-order UINT
HiUINT += NumGet(FileParts, Offset += 4, "UInt") ; add second UINT value to high-order UINT
}
; Adjust the probable overflow of the low-order UINT
HiUINT += LoUINT >> 32 ; add the overflow to the high-order UINT
LoUINT &= 0xFFFFFFFF ; remove the overflow from the low-order UINT
; Now get the hex string, i.e. the hash ---------------------------------------------------------
Hash := ""
VarSetCapacity(UINT64, 8, 0)
NumPut((HiUINT << 32) | LoUINT, UINT64, 0, "UInt64")
Loop, 8
Hash .= X[(Byte := NumGet(UINT64, 8 - A_Index, "UChar")) >> 4] . X[Byte & 0x0F]
Return Hash
}
; ==================================================================================================
Lisp
; opensubtitle hash, common lisp, sbcl
; sean langton 2013
(defun get-lvalue(stream)
(let ((c)(n 0)(m 1))
(loop for x from 0 to 7 do
(setf c (read-byte stream))
(setf n (+ n (* c m)))
(setf m (* m 256))
) n))
(defun hashfile(path)
(let ((hash '(unsigned-byte 64))(len))
(with-open-file (in path :element-type '(unsigned-byte 8))
(setf len (file-length in))
(setf hash len)
(cond ((< len (* 2 65536))
(print "file too small to hash")
(return-from hashfile nil)))
(loop for x from 0 to 8191 do
(setf hash (logand (+ hash (get-lvalue in)) #xFFFFFFFFFFFFFFFF )))
(file-position in (- len 65536))
(loop for x from 0 to 8191 do
(setf hash (logand (+ hash (get-lvalue in)) #xFFFFFFFFFFFFFFFF )))
(format t "~&~16,'0x" hash))))
; (hashfile #p"~/Downloads/breakdance.avi")
; (hashfile #p"~/Downloads/dummy/dummy.bin")
Pascal
procedure ComputeHash(const Stream : TStream;
out Size : qword;
out Hash : string);
var
hashQ : qword;
fsize : qword;
i : integer;
read : integer;
s : array[0..7] of char;
tmp : qword absolute s;
begin
Stream.Seek(0, soFromBeginning);
Size := Stream.Size;
hashQ := size;;
i := 0;
read := 1;
while ((i < 8192) and (read > 0)) do begin
read := Stream.Read(s, sizeof(s));
if read > 0 then begin
hashQ := hashQ + tmp;
end;
i := i + 1;
end;
Stream.Seek(-65536, soFromEnd);
i := 0;
read := 1;
while ((i < 8192) and (read > 0)) do begin
read := Stream.Read(s, sizeof(s));
if read > 0 then begin
hashQ := hashQ + tmp;
end;
i := i + 1;
end;
Hash := lowercase(Format('%.16x',[hashQ]));
end;
Scala
import java.io.{FileInputStream, File}
import java.nio.{LongBuffer, ByteOrder, ByteBuffer}
import java.nio.channels.FileChannel.MapMode
import scala.math._
class OpenSubtitlesHasher {
private val hashChunkSize = 64L * 1024L
def computeHash(file: File) : String = {
val fileSize = file.length
val chunkSizeForFile = min(fileSize, hashChunkSize)
val fileChannel = new FileInputStream(file).getChannel
try {
val head = computeHashForChunk(fileChannel.map(MapMode.READ_ONLY, 0, chunkSizeForFile))
val tail = computeHashForChunk(fileChannel.map(MapMode.READ_ONLY, max(fileSize - hashChunkSize, 0), chunkSizeForFile))
"%016x".format(fileSize + head + tail)
} finally {
fileChannel.close()
}
}
private def computeHashForChunk(buffer: ByteBuffer) : Long = {
def doCompute(longBuffer: LongBuffer, hash: Long) : Long = {
longBuffer.hasRemaining match {
case false => hash
case true => doCompute(longBuffer, hash + longBuffer.get)
}
}
val longBuffer = buffer.order(ByteOrder.LITTLE_ENDIAN).asLongBuffer()
doCompute(longBuffer, 0L)
}
}
Javascript
Download example. Key is using Javascript LONG library. Thanks to Oscar Brito for fixing the code.
//be sure Long.min.js is already included
/*
* Calculate OpenSubtitles hash
* (Oscar Brito - aetheon@gmail.com)
*
* @param {File} file - a File obj contained on a DataTransfer
* @param {Function} onComplete - the result callback
*/
var OpenSubtitlesHash = function(file, onComplete){
var HASH_CHUNK_SIZE = 64 * 1024;
if(file.size<HASH_CHUNK_SIZE)
HASH_CHUNK_SIZE = file.size;
// sum chunk long values
var sumChunk = function(arrayBuffer){
var view = new DataView(arrayBuffer);
var hNumber = new dcodeIO.Long();
for(var i=0; i<arrayBuffer.byteLength; i+=8){
var low = view.getUint32(i, true);
var high = view.getUint32(i+4, true);
var n = new dcodeIO.Long(low, high);
hNumber = hNumber.add(n);
}
return hNumber;
};
// read chunk
var readChunk = function(start, end, callback){
var reader = new FileReader();
reader.onload = function(e){
// sum all long values on the chunk
var number = sumChunk(e.currentTarget.result);
if(callback)
callback(number);
}
var blob = file.slice(start, end);
reader.readAsArrayBuffer(blob);
};
// read the first chunk
readChunk(0, HASH_CHUNK_SIZE, function(head){
// read the tail chunk
var start = file.size-HASH_CHUNK_SIZE;
if(start < 0)
start = 0;
readChunk(start, file.size, function(tail){
// sum all values
var sum = head.add(tail).add(new dcodeIO.Long(file.size));
// convert to hex
var sumHex = sum.toString(16);
if(onComplete)
onComplete(sumHex);
});
});
};
// TODO
$(document).ready(function() {
$('#search_field').bind('drop', function(e, ev) {
e.preventDefault();
var files = e.originalEvent.dataTransfer.files;
$.each(files, function(index, file) {
OpenSubtitlesHash(file, function(hash){
// TODO
document.write(hash);
})
});
});
});
Attachments (1)
-
GetHash.dll
(4.5 KB) -
added by guest 15 years ago.
GetHash?.dll
Download all attachments as: .zip
