unit CRC;interfacefunction UpdateCRC16(InitCRC: Word; var Buffer;
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
{ I believe this is the CRC used by the XModem protocol.
The transmitting end should initialize with zero, UpdateCRC16 for
the block, Continue the UpdateCRC16 for two nulls, and append the
result (hi order byte first) to the transmitted block. The receiver
should initialize with zero and UpdateCRC16 for the received block
including the two byte CRC. The result will be zero (why?) if there
were no transmission errors. (I have not tested this function with
an actual XModem implementation, though I did verify the behavior
just described. See TESTCRC.DPR.) }function UpdateCRCArc(InitCRC: Word; var Buffer;
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
{ This function computes the CRC used by SEA's ARC utility.
Initialize with zero.}function UpdateCRC32(InitCRC: LongInt; var Buffer;
{$IFDEF Win32} Length: LongInt {$ELSE} Length: Word {$ENDIF}): LongInt;
{ This function computes the CRC used by PKZIP and Forsberg's ZModem.
Initialize with high-values ($FFFFFFFF), and finish by inverting
allbits (Not). }function FileCRC16(FileName: String; var CRC16: Word): Boolean; { Return True if ok }
function FileCRCArc(FileName: String; var CRCArc: Word): Boolean; { Return True if ok }
function FileCRC32(FileName: String; var CRC32: LongInt): Boolean; { Return True if ok }implementationconst
CrcArcTab: Array[0..$FF] of Word =
($00000, $0C0C1, $0C181, $00140, $0C301, $003C0, $00280, $0C241,
$0C601, $006C0, $00780, $0C741, $00500, $0C5C1, $0C481, $00440,
$0CC01, $00CC0, $00D80, $0CD41, $00F00, $0CFC1, $0CE81, $00E40,
$00A00, $0CAC1, $0CB81, $00B40, $0C901, $009C0, $00880, $0C841,
$0D801, $018C0, $01980, $0D941, $01B00, $0DBC1, $0DA81, $01A40,
$01E00, $0DEC1, $0DF81, $01F40, $0DD01, $01DC0, $01C80, $0DC41,
$01400, $0D4C1, $0D581, $01540, $0D701, $017C0, $01680, $0D641,
$0D201, $012C0, $01380, $0D341, $01100, $0D1C1, $0D081, $01040,
$0F001, $030C0, $03180, $0F141, $03300, $0F3C1, $0F281, $03240,
$03600, $0F6C1, $0F781, $03740, $0F501, $035C0, $03480, $0F441,
$03C00, $0FCC1, $0FD81, $03D40, $0FF01, $03FC0, $03E80, $0FE41,
$0FA01, $03AC0, $03B80, $0FB41, $03900, $0F9C1, $0F881, $03840,
$02800, $0E8C1, $0E981, $02940, $0EB01, $02BC0, $02A80, $0EA41,
$0EE01, $02EC0, $02F80, $0EF41, $02D00, $0EDC1, $0EC81, $02C40,
$0E401, $024C0, $02580, $0E541, $02700, $0E7C1, $0E681, $02640,
$02200, $0E2C1, $0E381, $02340, $0E101, $021C0, $02080, $0E041,
$0A001, $060C0, $06180, $0A141, $06300, $0A3C1, $0A281, $06240,
$06600, $0A6C1, $0A781, $06740, $0A501, $065C0, $06480, $0A441,
$06C00, $0ACC1, $0AD81, $06D40, $0AF01, $06FC0, $06E80, $0AE41,
$0AA01, $06AC0, $06B80, $0AB41, $06900, $0A9C1, $0A881, $06840,
$07800, $0B8C1, $0B981, $07940, $0BB01, $07BC0, $07A80, $0BA41,
$0BE01, $07EC0, $07F80, $0BF41, $07D00, $0BDC1, $0BC81, $07C40,
$0B401, $074C0, $07580, $0B541, $07700, $0B7C1, $0B681, $07640,
$07200, $0B2C1, $0B381, $07340, $0B101, $071C0, $07080, $0B041,
$05000, $090C1, $09181, $05140, $09301, $053C0, $05280, $09241,
$09601, $056C0, $05780, $09741, $05500, $095C1, $09481, $05440,
$09C01, $05CC0, $05D80, $09D41, $05F00, $09FC1, $09E81, $05E40,
$05A00, $09AC1, $09B81, $05B40, $09901, $059C0, $05880, $09841,
$08801, $048C0, $04980, $08941, $04B00, $08BC1, $08A81, $04A40,
$04E00, $08EC1, $08F81, $04F40, $08D01, $04DC0, $04C80, $08C41,
$04400, $084C1, $08581, $04540, $08701, $047C0, $04680, $08641,
$08201, $042C0, $04380, $08341, $04100, $081C1, $08081, $04040); Crc16Tab: Array[0..$FF] of Word =
($00000, $01021, $02042, $03063, $04084, $050a5, $060c6, $070e7,
$08108, $09129, $0a14a, $0b16b, $0c18c, $0d1ad, $0e1ce, $0f1ef,
$01231, $00210, $03273, $02252, $052b5, $04294, $072f7, $062d6,
$09339, $08318, $0b37b, $0a35a, $0d3bd, $0c39c, $0f3ff, $0e3de,
$02462, $03443, $00420, $01401, $064e6, $074c7, $044a4, $05485,
$0a56a, $0b54b, $08528, $09509, $0e5ee, $0f5cf, $0c5ac, $0d58d,
$03653, $02672, $01611, $00630, $076d7, $066f6, $05695, $046b4,
$0b75b, $0a77a, $09719, $08738, $0f7df, $0e7fe, $0d79d, $0c7bc,
$048c4, $058e5, $06886, $078a7, $00840, $01861, $02802, $03823,
$0c9cc, $0d9ed, $0e98e, $0f9af, $08948, $09969, $0a90a, $0b92b,
$05af5, $04ad4, $07ab7, $06a96, $01a71, $00a50, $03a33, $02a12,
$0dbfd, $0cbdc, $0fbbf, $0eb9e, $09b79, $08b58, $0bb3b, $0ab1a,
$06ca6, $07c87, $04ce4, $05cc5, $02c22, $03c03, $00c60, $01c41,
$0edae, $0fd8f, $0cdec, $0ddcd, $0ad2a, $0bd0b, $08d68, $09d49,
$07e97, $06eb6, $05ed5, $04ef4, $03e13, $02e32, $01e51, $00e70,
$0ff9f, $0efbe, $0dfdd, $0cffc, $0bf1b, $0af3a, $09f59, $08f78,
$09188, $081a9, $0b1ca, $0a1eb, $0d10c, $0c12d, $0f14e, $0e16f,
$01080, $000a1, $030c2, $020e3, $05004, $04025, $07046, $06067,
$083b9, $09398, $0a3fb, $0b3da, $0c33d, $0d31c, $0e37f, $0f35e,
$002b1, $01290, $022f3, $032d2, $04235, $05214, $06277, $07256,
$0b5ea, $0a5cb, $095a8, $08589, $0f56e, $0e54f, $0d52c, $0c50d,
$034e2, $024c3, $014a0, $00481, $07466, $06447, $05424, $04405,
$0a7db, $0b7fa, $08799, $097b8, $0e75f, $0f77e, $0c71d, $0d73c,
$026d3, $036f2, $00691, $016b0, $06657, $07676, $04615, $05634,
$0d94c, $0c96d, $0f90e, $0e92f, $099c8, $089e9, $0b98a, $0a9ab,
$05844, $04865, $07806, $06827, $018c0, $008e1, $03882, $028a3,
$0cb7d, $0db5c, $0eb3f, $0fb1e, $08bf9, $09bd8, $0abbb, $0bb9a,
$04a75, $05a54, $06a37, $07a16, $00af1, $01ad0, $02ab3, $03a92,
$0fd2e, $0ed0f, $0dd6c, $0cd4d, $0bdaa, $0ad8b, $09de8, $08dc9,
$07c26, $06c07, $05c64, $04c45, $03ca2, $02c83, $01ce0, $00cc1,
$0ef1f, $0ff3e, $0cf5d, $0df7c, $0af9b, $0bfba, $08fd9, $09ff8,
$06e17, $07e36, $04e55, $05e74, $02e93, $03eb2, $00ed1, $01ef0); Crc32Tab: Array[0..$FF] of LongInt =
($00000000, $77073096, $ee0e612c, $990951ba, $076dc419, $706af48f,
$e963a535, $9e6495a3, $0edb8832, $79dcb8a4, $e0d5e91e, $97d2d988,
$09b64c2b, $7eb17cbd, $e7b82d07, $90bf1d91, $1db71064, $6ab020f2,
$f3b97148, $84be41de, $1adad47d, $6ddde4eb, $f4d4b551, $83d385c7,
$136c9856, $646ba8c0, $fd62f97a, $8a65c9ec, $14015c4f, $63066cd9,
$fa0f3d63, $8d080df5, $3b6e20c8, $4c69105e, $d56041e4, $a2677172,
$3c03e4d1, $4b04d447, $d20d85fd, $a50ab56b, $35b5a8fa, $42b2986c,
$dbbbc9d6, $acbcf940, $32d86ce3, $45df5c75, $dcd60dcf, $abd13d59,
$26d930ac, $51de003a, $c8d75180, $bfd06116, $21b4f4b5, $56b3c423,
$cfba9599, $b8bda50f, $2802b89e, $5f058808, $c60cd9b2, $b10be924,
$2f6f7c87, $58684c11, $c1611dab, $b6662d3d, $76dc4190, $01db7106,
$98d220bc, $efd5102a, $71b18589, $06b6b51f, $9fbfe4a5, $e8b8d433,
$7807c9a2, $0f00f934, $9609a88e, $e10e9818, $7f6a0dbb, $086d3d2d,
$91646c97, $e6635c01, $6b6b51f4, $1c6c6162, $856530d8, $f262004e,
$6c0695ed, $1b01a57b, $8208f4c1, $f50fc457, $65b0d9c6, $12b7e950,
$8bbeb8ea, $fcb9887c, $62dd1ddf, $15da2d49, $8cd37cf3, $fbd44c65,
$4db26158, $3ab551ce, $a3bc0074, $d4bb30e2, $4adfa541, $3dd895d7,
$a4d1c46d, $d3d6f4fb, $4369e96a, $346ed9fc, $ad678846, $da60b8d0,
$44042d73, $33031de5, $aa0a4c5f, $dd0d7cc9, $5005713c, $270241aa,
$be0b1010, $c90c2086, $5768b525, $206f85b3, $b966d409, $ce61e49f,
$5edef90e, $29d9c998, $b0d09822, $c7d7a8b4, $59b33d17, $2eb40d81,
$b7bd5c3b, $c0ba6cad, $edb88320, $9abfb3b6, $03b6e20c, $74b1d29a,
$ead54739, $9dd277af, $04db2615, $73dc1683, $e3630b12, $94643b84,
$0d6d6a3e, $7a6a5aa8, $e40ecf0b, $9309ff9d, $0a00ae27, $7d079eb1,
$f00f9344, $8708a3d2, $1e01f268, $6906c2fe, $f762575d, $806567cb,
$196c3671, $6e6b06e7, $fed41b76, $89d32be0, $10da7a5a, $67dd4acc,
$f9b9df6f, $8ebeeff9, $17b7be43, $60b08ed5, $d6d6a3e8, $a1d1937e,
$38d8c2c4, $4fdff252, $d1bb67f1, $a6bc5767, $3fb506dd, $48b2364b,
$d80d2bda, $af0a1b4c, $36034af6, $41047a60, $df60efc3, $a867df55,
$316e8eef, $4669be79, $cb61b38c, $bc66831a, $256fd2a0, $5268e236,
$cc0c7795, $bb0b4703, $220216b9, $5505262f, $c5ba3bbe, $b2bd0b28,
$2bb45a92, $5cb36a04, $c2d7ffa7, $b5d0cf31, $2cd99e8b, $5bdeae1d,
$9b64c2b0, $ec63f226, $756aa39c, $026d930a, $9c0906a9, $eb0e363f,
$72076785, $05005713, $95bf4a82, $e2b87a14, $7bb12bae, $0cb61b38,
$92d28e9b, $e5d5be0d, $7cdcefb7, $0bdbdf21, $86d3d2d4, $f1d4e242,
$68ddb3f8, $1fda836e, $81be16cd, $f6b9265b, $6fb077e1, $18b74777,
$88085ae6, $ff0f6a70, $66063bca, $11010b5c, $8f659eff, $f862ae69,
$616bffd3, $166ccf45, $a00ae278, $d70dd2ee, $4e048354, $3903b3c2,
$a7672661, $d06016f7, $4969474d, $3e6e77db, $aed16a4a, $d9d65adc,
$40df0b66, $37d83bf0, $a9bcae53, $debb9ec5, $47b2cf7f, $30b5ffe9,
$bdbdf21c, $cabac28a, $53b39330, $24b4a3a6, $bad03605, $cdd70693,
$54de5729, $23d967bf, $b3667a2e, $c4614ab8, $5d681b02, $2a6f2b94,
$b40bbe37, $c30c8ea1, $5a05df1b, $2d02ef8d);function UpdateCRC16(InitCRC: Word; var Buffer;
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
begin
asm
{$IFDEF Win32}
push esi
push edi
push eax
push ebx
push ecx
push edx
lea edi, Crc16Tab
mov esi, Buffer
mov ax, InitCrc
mov ecx, Length
or ecx, ecx
jz @@done
@@loop:
xor ebx, ebx
mov bl, ah
mov ah, al
lodsb
shl bx, 1
add ebx, edi
xor ax, [ebx]
loop @@loop
@@done:
mov Result, ax
pop edx
pop ecx
pop ebx
pop eax
pop edi
pop esi
{$ELSE}
lea di, Crc16Tab
push ds
pop es
push ds
lds si, Buffer
mov ax, InitCrc
mov cx, Length
or cx, cx
jz @@done
@@loop:
xor bx, bx
mov bl, ah
mov ah, al
lodsb
shl bx, 1
xor ax, es:[di + bx]
loop @@loop
pop ds
@@done:
mov Result, ax
{$ENDIF}
end;
end;function UpdateCRCArc(InitCRC: Word; var Buffer;
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
begin
asm
{$IFDEF Win32}
push esi
push edi
push eax
push ebx
push ecx
push edx
lea edi, CrcArcTab
mov esi, Buffer
mov ax, InitCrc
mov ecx, Length
or ecx, ecx
jz @@done
@@loop:
xor ebx, ebx
mov bl, al
lodsb
xor bl, al
shl bx, 1
add ebx, edi
mov bx, [ebx]
xor bl, ah
mov ax, bx
loop @@loop
@@done:
mov Result, ax
pop edx
pop ecx
pop ebx
pop eax
pop edi
pop esi
{$ELSE}
lea di, CrcArcTab
push ds
pop es
push ds
lds si, Buffer
mov ax, InitCrc
mov cx, Length
or cx, cx
jz @@done
@@loop:
xor bx, bx
mov bl, al
lodsb
xor bl, al
shl bx, 1
mov bx, es:[di + bx]
xor bl, ah
mov ax, bx
loop @@loop
pop ds
@@done:
mov Result, ax
{$ENDIF}
end;
end;function UpdateCRC32(InitCRC: LongInt; var Buffer;
{$IFDEF Win32} Length: LongInt {$ELSE} Length: Word {$ENDIF}): LongInt;
begin
asm
{$IFDEF Win32}
push esi
push edi
push eax
push ebx
push ecx
push edx
lea edi, Crc32Tab
mov esi, Buffer
mov ax, word ptr InitCRC
mov dx, word ptr InitCRC + 2
mov ecx, Length
or ecx, ecx
jz @@done
@@loop:
xor ebx, ebx
mov bl, al
lodsb
xor bl, al
mov al, ah
mov ah, dl
mov dl, dh
xor dh, dh
shl bx, 1
shl bx, 1
add ebx, edi
xor ax, [ebx]
xor dx, [ebx + 2]
loop @@loop
@@done:
mov word ptr Result, ax
mov word ptr Result + 2, dx
pop edx
pop ecx
pop ebx
pop eax
pop edi
pop esi
{$ELSE}
push ds
pop es
push ds
lea di, CRC32Tab
lds si, Buffer
mov ax, word ptr InitCRC
mov dx, word ptr InitCRC + 2
mov cx, Length
or cx, cx
jz @@done
@@loop:
xor bh, bh
mov bl, al
lodsb
xor bl, al
mov al, ah
mov ah, dl
mov dl, dh
xor dh, dh
shl bx, 1
shl bx, 1
xor ax, es:[di + bx]
xor dx, es:[di + bx + 2]
loop @@loop
@@done:
pop ds
mov word ptr Result, ax
mov word ptr Result + 2, dx
{$ENDIF}
end;
end;function FileCRC16(FileName: String; var CRC16: Word): Boolean; { Return True if ok }
var
f: File;
p: Pointer;
FSize: LongInt;
{$IFNDEF Win32}
tmp: Word;
{$ENDIF}
begin
{$I+}
try
AssignFile(f, FileName);
Reset(f, 1);
FSize := FileSize(f);
if FSize <> 0 then
begin
{$IFDEF Win32}
GetMem(p, FSize);
BlockRead(f, p^, FSize);
CRC16 := UpdateCrc16(0, p^, FSize); {!}
FreeMem(p, FSize);
{$ELSE}
CRC16 := 0; { Usualy from zero }
while FSize <> 0 do
begin
if FSize > $FFFF then tmp := $FFFF else tmp := FSize;
dec(FSize, tmp);
GetMem(p, tmp);
BlockRead(f, p^, tmp);
CRC16 := UpdateCrc16(Crc16, p^, tmp); {!}
FreeMem(p, tmp);
end;
{$ENDIF} GetMem(p, 2); { Finish XModem crc with two nulls }
FillChar(p^, 2, 0);
Crc16 := UpdateCrc16(Crc16, p^, 2);
FreeMem(p, 2); end;
Result := True;
except
Result := False;
end;
try
CloseFile(f);
except
end;
{$I-}
end;function FileCRCArc(FileName: String; var CRCArc: Word): Boolean; { Return True if ok }
var
f: File;
p: Pointer;
FSize: LongInt;
{$IFNDEF Win32}
tmp: Word;
{$ENDIF}
begin
{$I+}
try
AssignFile(f, FileName);
Reset(f, 1);
FSize := FileSize(f);
if FSize <> 0 then
begin
{$IFDEF Win32}
GetMem(p, FSize);
BlockRead(f, p^, FSize);
CRCArc := UpdateCrcArc(0, p^, FSize); {!}
FreeMem(p, FSize);
{$ELSE}
CRCArc := 0; { Usualy from zero }
while FSize <> 0 do
begin
if FSize > $FFFF then tmp := $FFFF else tmp := FSize;
dec(FSize, tmp);
GetMem(p, tmp);
BlockRead(f, p^, tmp);
CRCArc := UpdateCrcArc(CrcArc, p^, tmp); {!}
FreeMem(p, tmp);
end;
{$ENDIF}
end;
Result := True;
except
Result := False;
end;
try
CloseFile(f);
except
end;
{$I-}
end;function FileCRC32(FileName: String; var CRC32: LongInt): Boolean; { Return True if ok }
var
f: File;
p: Pointer;
FSize: LongInt;
{$IFNDEF Win32}
tmp: Word;
{$ENDIF}
begin
{$I+}
try
AssignFile(f, FileName);
Reset(f, 1);
FSize := FileSize(f);
if FSize <> 0 then
begin
{$IFDEF Win32}
GetMem(p, FSize);
BlockRead(f, p^, FSize);
CRC32 := UpdateCrc32($FFFFFFFF, p^, FSize); {!}
FreeMem(p, FSize);
{$ELSE}
CRC32 := $FFFFFFFF; { Usualy }
while FSize <> 0 do
begin
if FSize > $FFFF then tmp := $FFFF else tmp := FSize;
dec(FSize, tmp);
GetMem(p, tmp);
BlockRead(f, p^, tmp);
CRC32 := UpdateCrc32(Crc32, p^, tmp); {!}
FreeMem(p, tmp);
end;
{$ENDIF}
CRC32 := not CRC32; { Finish 32 bit crc by inverting all bits }
end;
Result := True;
except
Result := False;
end;
try
CloseFile(f);
except
end;
{$I-}
end;end.
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
{ I believe this is the CRC used by the XModem protocol.
The transmitting end should initialize with zero, UpdateCRC16 for
the block, Continue the UpdateCRC16 for two nulls, and append the
result (hi order byte first) to the transmitted block. The receiver
should initialize with zero and UpdateCRC16 for the received block
including the two byte CRC. The result will be zero (why?) if there
were no transmission errors. (I have not tested this function with
an actual XModem implementation, though I did verify the behavior
just described. See TESTCRC.DPR.) }function UpdateCRCArc(InitCRC: Word; var Buffer;
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
{ This function computes the CRC used by SEA's ARC utility.
Initialize with zero.}function UpdateCRC32(InitCRC: LongInt; var Buffer;
{$IFDEF Win32} Length: LongInt {$ELSE} Length: Word {$ENDIF}): LongInt;
{ This function computes the CRC used by PKZIP and Forsberg's ZModem.
Initialize with high-values ($FFFFFFFF), and finish by inverting
allbits (Not). }function FileCRC16(FileName: String; var CRC16: Word): Boolean; { Return True if ok }
function FileCRCArc(FileName: String; var CRCArc: Word): Boolean; { Return True if ok }
function FileCRC32(FileName: String; var CRC32: LongInt): Boolean; { Return True if ok }implementationconst
CrcArcTab: Array[0..$FF] of Word =
($00000, $0C0C1, $0C181, $00140, $0C301, $003C0, $00280, $0C241,
$0C601, $006C0, $00780, $0C741, $00500, $0C5C1, $0C481, $00440,
$0CC01, $00CC0, $00D80, $0CD41, $00F00, $0CFC1, $0CE81, $00E40,
$00A00, $0CAC1, $0CB81, $00B40, $0C901, $009C0, $00880, $0C841,
$0D801, $018C0, $01980, $0D941, $01B00, $0DBC1, $0DA81, $01A40,
$01E00, $0DEC1, $0DF81, $01F40, $0DD01, $01DC0, $01C80, $0DC41,
$01400, $0D4C1, $0D581, $01540, $0D701, $017C0, $01680, $0D641,
$0D201, $012C0, $01380, $0D341, $01100, $0D1C1, $0D081, $01040,
$0F001, $030C0, $03180, $0F141, $03300, $0F3C1, $0F281, $03240,
$03600, $0F6C1, $0F781, $03740, $0F501, $035C0, $03480, $0F441,
$03C00, $0FCC1, $0FD81, $03D40, $0FF01, $03FC0, $03E80, $0FE41,
$0FA01, $03AC0, $03B80, $0FB41, $03900, $0F9C1, $0F881, $03840,
$02800, $0E8C1, $0E981, $02940, $0EB01, $02BC0, $02A80, $0EA41,
$0EE01, $02EC0, $02F80, $0EF41, $02D00, $0EDC1, $0EC81, $02C40,
$0E401, $024C0, $02580, $0E541, $02700, $0E7C1, $0E681, $02640,
$02200, $0E2C1, $0E381, $02340, $0E101, $021C0, $02080, $0E041,
$0A001, $060C0, $06180, $0A141, $06300, $0A3C1, $0A281, $06240,
$06600, $0A6C1, $0A781, $06740, $0A501, $065C0, $06480, $0A441,
$06C00, $0ACC1, $0AD81, $06D40, $0AF01, $06FC0, $06E80, $0AE41,
$0AA01, $06AC0, $06B80, $0AB41, $06900, $0A9C1, $0A881, $06840,
$07800, $0B8C1, $0B981, $07940, $0BB01, $07BC0, $07A80, $0BA41,
$0BE01, $07EC0, $07F80, $0BF41, $07D00, $0BDC1, $0BC81, $07C40,
$0B401, $074C0, $07580, $0B541, $07700, $0B7C1, $0B681, $07640,
$07200, $0B2C1, $0B381, $07340, $0B101, $071C0, $07080, $0B041,
$05000, $090C1, $09181, $05140, $09301, $053C0, $05280, $09241,
$09601, $056C0, $05780, $09741, $05500, $095C1, $09481, $05440,
$09C01, $05CC0, $05D80, $09D41, $05F00, $09FC1, $09E81, $05E40,
$05A00, $09AC1, $09B81, $05B40, $09901, $059C0, $05880, $09841,
$08801, $048C0, $04980, $08941, $04B00, $08BC1, $08A81, $04A40,
$04E00, $08EC1, $08F81, $04F40, $08D01, $04DC0, $04C80, $08C41,
$04400, $084C1, $08581, $04540, $08701, $047C0, $04680, $08641,
$08201, $042C0, $04380, $08341, $04100, $081C1, $08081, $04040); Crc16Tab: Array[0..$FF] of Word =
($00000, $01021, $02042, $03063, $04084, $050a5, $060c6, $070e7,
$08108, $09129, $0a14a, $0b16b, $0c18c, $0d1ad, $0e1ce, $0f1ef,
$01231, $00210, $03273, $02252, $052b5, $04294, $072f7, $062d6,
$09339, $08318, $0b37b, $0a35a, $0d3bd, $0c39c, $0f3ff, $0e3de,
$02462, $03443, $00420, $01401, $064e6, $074c7, $044a4, $05485,
$0a56a, $0b54b, $08528, $09509, $0e5ee, $0f5cf, $0c5ac, $0d58d,
$03653, $02672, $01611, $00630, $076d7, $066f6, $05695, $046b4,
$0b75b, $0a77a, $09719, $08738, $0f7df, $0e7fe, $0d79d, $0c7bc,
$048c4, $058e5, $06886, $078a7, $00840, $01861, $02802, $03823,
$0c9cc, $0d9ed, $0e98e, $0f9af, $08948, $09969, $0a90a, $0b92b,
$05af5, $04ad4, $07ab7, $06a96, $01a71, $00a50, $03a33, $02a12,
$0dbfd, $0cbdc, $0fbbf, $0eb9e, $09b79, $08b58, $0bb3b, $0ab1a,
$06ca6, $07c87, $04ce4, $05cc5, $02c22, $03c03, $00c60, $01c41,
$0edae, $0fd8f, $0cdec, $0ddcd, $0ad2a, $0bd0b, $08d68, $09d49,
$07e97, $06eb6, $05ed5, $04ef4, $03e13, $02e32, $01e51, $00e70,
$0ff9f, $0efbe, $0dfdd, $0cffc, $0bf1b, $0af3a, $09f59, $08f78,
$09188, $081a9, $0b1ca, $0a1eb, $0d10c, $0c12d, $0f14e, $0e16f,
$01080, $000a1, $030c2, $020e3, $05004, $04025, $07046, $06067,
$083b9, $09398, $0a3fb, $0b3da, $0c33d, $0d31c, $0e37f, $0f35e,
$002b1, $01290, $022f3, $032d2, $04235, $05214, $06277, $07256,
$0b5ea, $0a5cb, $095a8, $08589, $0f56e, $0e54f, $0d52c, $0c50d,
$034e2, $024c3, $014a0, $00481, $07466, $06447, $05424, $04405,
$0a7db, $0b7fa, $08799, $097b8, $0e75f, $0f77e, $0c71d, $0d73c,
$026d3, $036f2, $00691, $016b0, $06657, $07676, $04615, $05634,
$0d94c, $0c96d, $0f90e, $0e92f, $099c8, $089e9, $0b98a, $0a9ab,
$05844, $04865, $07806, $06827, $018c0, $008e1, $03882, $028a3,
$0cb7d, $0db5c, $0eb3f, $0fb1e, $08bf9, $09bd8, $0abbb, $0bb9a,
$04a75, $05a54, $06a37, $07a16, $00af1, $01ad0, $02ab3, $03a92,
$0fd2e, $0ed0f, $0dd6c, $0cd4d, $0bdaa, $0ad8b, $09de8, $08dc9,
$07c26, $06c07, $05c64, $04c45, $03ca2, $02c83, $01ce0, $00cc1,
$0ef1f, $0ff3e, $0cf5d, $0df7c, $0af9b, $0bfba, $08fd9, $09ff8,
$06e17, $07e36, $04e55, $05e74, $02e93, $03eb2, $00ed1, $01ef0); Crc32Tab: Array[0..$FF] of LongInt =
($00000000, $77073096, $ee0e612c, $990951ba, $076dc419, $706af48f,
$e963a535, $9e6495a3, $0edb8832, $79dcb8a4, $e0d5e91e, $97d2d988,
$09b64c2b, $7eb17cbd, $e7b82d07, $90bf1d91, $1db71064, $6ab020f2,
$f3b97148, $84be41de, $1adad47d, $6ddde4eb, $f4d4b551, $83d385c7,
$136c9856, $646ba8c0, $fd62f97a, $8a65c9ec, $14015c4f, $63066cd9,
$fa0f3d63, $8d080df5, $3b6e20c8, $4c69105e, $d56041e4, $a2677172,
$3c03e4d1, $4b04d447, $d20d85fd, $a50ab56b, $35b5a8fa, $42b2986c,
$dbbbc9d6, $acbcf940, $32d86ce3, $45df5c75, $dcd60dcf, $abd13d59,
$26d930ac, $51de003a, $c8d75180, $bfd06116, $21b4f4b5, $56b3c423,
$cfba9599, $b8bda50f, $2802b89e, $5f058808, $c60cd9b2, $b10be924,
$2f6f7c87, $58684c11, $c1611dab, $b6662d3d, $76dc4190, $01db7106,
$98d220bc, $efd5102a, $71b18589, $06b6b51f, $9fbfe4a5, $e8b8d433,
$7807c9a2, $0f00f934, $9609a88e, $e10e9818, $7f6a0dbb, $086d3d2d,
$91646c97, $e6635c01, $6b6b51f4, $1c6c6162, $856530d8, $f262004e,
$6c0695ed, $1b01a57b, $8208f4c1, $f50fc457, $65b0d9c6, $12b7e950,
$8bbeb8ea, $fcb9887c, $62dd1ddf, $15da2d49, $8cd37cf3, $fbd44c65,
$4db26158, $3ab551ce, $a3bc0074, $d4bb30e2, $4adfa541, $3dd895d7,
$a4d1c46d, $d3d6f4fb, $4369e96a, $346ed9fc, $ad678846, $da60b8d0,
$44042d73, $33031de5, $aa0a4c5f, $dd0d7cc9, $5005713c, $270241aa,
$be0b1010, $c90c2086, $5768b525, $206f85b3, $b966d409, $ce61e49f,
$5edef90e, $29d9c998, $b0d09822, $c7d7a8b4, $59b33d17, $2eb40d81,
$b7bd5c3b, $c0ba6cad, $edb88320, $9abfb3b6, $03b6e20c, $74b1d29a,
$ead54739, $9dd277af, $04db2615, $73dc1683, $e3630b12, $94643b84,
$0d6d6a3e, $7a6a5aa8, $e40ecf0b, $9309ff9d, $0a00ae27, $7d079eb1,
$f00f9344, $8708a3d2, $1e01f268, $6906c2fe, $f762575d, $806567cb,
$196c3671, $6e6b06e7, $fed41b76, $89d32be0, $10da7a5a, $67dd4acc,
$f9b9df6f, $8ebeeff9, $17b7be43, $60b08ed5, $d6d6a3e8, $a1d1937e,
$38d8c2c4, $4fdff252, $d1bb67f1, $a6bc5767, $3fb506dd, $48b2364b,
$d80d2bda, $af0a1b4c, $36034af6, $41047a60, $df60efc3, $a867df55,
$316e8eef, $4669be79, $cb61b38c, $bc66831a, $256fd2a0, $5268e236,
$cc0c7795, $bb0b4703, $220216b9, $5505262f, $c5ba3bbe, $b2bd0b28,
$2bb45a92, $5cb36a04, $c2d7ffa7, $b5d0cf31, $2cd99e8b, $5bdeae1d,
$9b64c2b0, $ec63f226, $756aa39c, $026d930a, $9c0906a9, $eb0e363f,
$72076785, $05005713, $95bf4a82, $e2b87a14, $7bb12bae, $0cb61b38,
$92d28e9b, $e5d5be0d, $7cdcefb7, $0bdbdf21, $86d3d2d4, $f1d4e242,
$68ddb3f8, $1fda836e, $81be16cd, $f6b9265b, $6fb077e1, $18b74777,
$88085ae6, $ff0f6a70, $66063bca, $11010b5c, $8f659eff, $f862ae69,
$616bffd3, $166ccf45, $a00ae278, $d70dd2ee, $4e048354, $3903b3c2,
$a7672661, $d06016f7, $4969474d, $3e6e77db, $aed16a4a, $d9d65adc,
$40df0b66, $37d83bf0, $a9bcae53, $debb9ec5, $47b2cf7f, $30b5ffe9,
$bdbdf21c, $cabac28a, $53b39330, $24b4a3a6, $bad03605, $cdd70693,
$54de5729, $23d967bf, $b3667a2e, $c4614ab8, $5d681b02, $2a6f2b94,
$b40bbe37, $c30c8ea1, $5a05df1b, $2d02ef8d);function UpdateCRC16(InitCRC: Word; var Buffer;
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
begin
asm
{$IFDEF Win32}
push esi
push edi
push eax
push ebx
push ecx
push edx
lea edi, Crc16Tab
mov esi, Buffer
mov ax, InitCrc
mov ecx, Length
or ecx, ecx
jz @@done
@@loop:
xor ebx, ebx
mov bl, ah
mov ah, al
lodsb
shl bx, 1
add ebx, edi
xor ax, [ebx]
loop @@loop
@@done:
mov Result, ax
pop edx
pop ecx
pop ebx
pop eax
pop edi
pop esi
{$ELSE}
lea di, Crc16Tab
push ds
pop es
push ds
lds si, Buffer
mov ax, InitCrc
mov cx, Length
or cx, cx
jz @@done
@@loop:
xor bx, bx
mov bl, ah
mov ah, al
lodsb
shl bx, 1
xor ax, es:[di + bx]
loop @@loop
pop ds
@@done:
mov Result, ax
{$ENDIF}
end;
end;function UpdateCRCArc(InitCRC: Word; var Buffer;
Length: {$IFDEF Win32} LongInt {$ELSE} Word {$ENDIF}): Word;
begin
asm
{$IFDEF Win32}
push esi
push edi
push eax
push ebx
push ecx
push edx
lea edi, CrcArcTab
mov esi, Buffer
mov ax, InitCrc
mov ecx, Length
or ecx, ecx
jz @@done
@@loop:
xor ebx, ebx
mov bl, al
lodsb
xor bl, al
shl bx, 1
add ebx, edi
mov bx, [ebx]
xor bl, ah
mov ax, bx
loop @@loop
@@done:
mov Result, ax
pop edx
pop ecx
pop ebx
pop eax
pop edi
pop esi
{$ELSE}
lea di, CrcArcTab
push ds
pop es
push ds
lds si, Buffer
mov ax, InitCrc
mov cx, Length
or cx, cx
jz @@done
@@loop:
xor bx, bx
mov bl, al
lodsb
xor bl, al
shl bx, 1
mov bx, es:[di + bx]
xor bl, ah
mov ax, bx
loop @@loop
pop ds
@@done:
mov Result, ax
{$ENDIF}
end;
end;function UpdateCRC32(InitCRC: LongInt; var Buffer;
{$IFDEF Win32} Length: LongInt {$ELSE} Length: Word {$ENDIF}): LongInt;
begin
asm
{$IFDEF Win32}
push esi
push edi
push eax
push ebx
push ecx
push edx
lea edi, Crc32Tab
mov esi, Buffer
mov ax, word ptr InitCRC
mov dx, word ptr InitCRC + 2
mov ecx, Length
or ecx, ecx
jz @@done
@@loop:
xor ebx, ebx
mov bl, al
lodsb
xor bl, al
mov al, ah
mov ah, dl
mov dl, dh
xor dh, dh
shl bx, 1
shl bx, 1
add ebx, edi
xor ax, [ebx]
xor dx, [ebx + 2]
loop @@loop
@@done:
mov word ptr Result, ax
mov word ptr Result + 2, dx
pop edx
pop ecx
pop ebx
pop eax
pop edi
pop esi
{$ELSE}
push ds
pop es
push ds
lea di, CRC32Tab
lds si, Buffer
mov ax, word ptr InitCRC
mov dx, word ptr InitCRC + 2
mov cx, Length
or cx, cx
jz @@done
@@loop:
xor bh, bh
mov bl, al
lodsb
xor bl, al
mov al, ah
mov ah, dl
mov dl, dh
xor dh, dh
shl bx, 1
shl bx, 1
xor ax, es:[di + bx]
xor dx, es:[di + bx + 2]
loop @@loop
@@done:
pop ds
mov word ptr Result, ax
mov word ptr Result + 2, dx
{$ENDIF}
end;
end;function FileCRC16(FileName: String; var CRC16: Word): Boolean; { Return True if ok }
var
f: File;
p: Pointer;
FSize: LongInt;
{$IFNDEF Win32}
tmp: Word;
{$ENDIF}
begin
{$I+}
try
AssignFile(f, FileName);
Reset(f, 1);
FSize := FileSize(f);
if FSize <> 0 then
begin
{$IFDEF Win32}
GetMem(p, FSize);
BlockRead(f, p^, FSize);
CRC16 := UpdateCrc16(0, p^, FSize); {!}
FreeMem(p, FSize);
{$ELSE}
CRC16 := 0; { Usualy from zero }
while FSize <> 0 do
begin
if FSize > $FFFF then tmp := $FFFF else tmp := FSize;
dec(FSize, tmp);
GetMem(p, tmp);
BlockRead(f, p^, tmp);
CRC16 := UpdateCrc16(Crc16, p^, tmp); {!}
FreeMem(p, tmp);
end;
{$ENDIF} GetMem(p, 2); { Finish XModem crc with two nulls }
FillChar(p^, 2, 0);
Crc16 := UpdateCrc16(Crc16, p^, 2);
FreeMem(p, 2); end;
Result := True;
except
Result := False;
end;
try
CloseFile(f);
except
end;
{$I-}
end;function FileCRCArc(FileName: String; var CRCArc: Word): Boolean; { Return True if ok }
var
f: File;
p: Pointer;
FSize: LongInt;
{$IFNDEF Win32}
tmp: Word;
{$ENDIF}
begin
{$I+}
try
AssignFile(f, FileName);
Reset(f, 1);
FSize := FileSize(f);
if FSize <> 0 then
begin
{$IFDEF Win32}
GetMem(p, FSize);
BlockRead(f, p^, FSize);
CRCArc := UpdateCrcArc(0, p^, FSize); {!}
FreeMem(p, FSize);
{$ELSE}
CRCArc := 0; { Usualy from zero }
while FSize <> 0 do
begin
if FSize > $FFFF then tmp := $FFFF else tmp := FSize;
dec(FSize, tmp);
GetMem(p, tmp);
BlockRead(f, p^, tmp);
CRCArc := UpdateCrcArc(CrcArc, p^, tmp); {!}
FreeMem(p, tmp);
end;
{$ENDIF}
end;
Result := True;
except
Result := False;
end;
try
CloseFile(f);
except
end;
{$I-}
end;function FileCRC32(FileName: String; var CRC32: LongInt): Boolean; { Return True if ok }
var
f: File;
p: Pointer;
FSize: LongInt;
{$IFNDEF Win32}
tmp: Word;
{$ENDIF}
begin
{$I+}
try
AssignFile(f, FileName);
Reset(f, 1);
FSize := FileSize(f);
if FSize <> 0 then
begin
{$IFDEF Win32}
GetMem(p, FSize);
BlockRead(f, p^, FSize);
CRC32 := UpdateCrc32($FFFFFFFF, p^, FSize); {!}
FreeMem(p, FSize);
{$ELSE}
CRC32 := $FFFFFFFF; { Usualy }
while FSize <> 0 do
begin
if FSize > $FFFF then tmp := $FFFF else tmp := FSize;
dec(FSize, tmp);
GetMem(p, tmp);
BlockRead(f, p^, tmp);
CRC32 := UpdateCrc32(Crc32, p^, tmp); {!}
FreeMem(p, tmp);
end;
{$ENDIF}
CRC32 := not CRC32; { Finish 32 bit crc by inverting all bits }
end;
Result := True;
except
Result := False;
end;
try
CloseFile(f);
except
end;
{$I-}
end;end.
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