--- /dev/null
+unit ParserIO;
+interface
+
+type
+ tDUMMY_BUFF = array[0..PRED(655350)] of Byte;
+
+function Scan(var buf; skip,size: Longint; str: String): Longint;
+function SensitiveScan(var buf; skip,size: Longint; str: String): Longint;
+function Compare(var buf1,buf2; size: Longint): Boolean;
+function Empty(var buf; size: Longint): Boolean;
+function CountLines(var buf; size: Longint): Longint;
+function Update16(var buf; size: Longint; crc: Word): Word;
+function Update32(var buf; size: Longint; crc: Longint): Longint;
+
+implementation
+
+var
+ CRC16_table: array[BYTE] of Word;
+ CRC32_table: array[BYTE] of Longint;
+
+function Scan(var buf; skip,size: Longint; str: String): Longint; assembler;
+asm
+ mov edi,[str]
+ mov esi,[str]
+ xor eax,eax
+ lodsb
+ stosb
+ xor ecx,ecx
+ mov ecx,eax
+ xor ebx,ebx
+ mov ebx,eax
+ jecxz @@9
+@@1: lodsb
+ cmp al,'a'
+ jb @@2
+ cmp al,'z'
+ ja @@2
+ sub al,20h
+@@2: stosb
+ loop @@1
+ sub edi,ebx
+ mov esi,[buf]
+ add esi,skip
+ mov ecx,size
+ sub ecx,skip
+ jecxz @@8
+ cld
+ sub ecx,ebx
+ jb @@8
+ inc ecx
+@@4: mov ah,[edi]
+ and ah,NOT 20h
+@@5: lodsb
+ and al,NOT 20h
+ cmp al,ah
+ loopne @@5
+ jne @@8
+ dec esi
+ mov edx,ecx
+ mov ecx,ebx
+@@6: repe cmpsb
+ je @@10
+ mov al,[esi-1]
+ cmp al,'a'
+ jb @@7
+ cmp al,'z'
+ ja @@7
+ sub al,20h
+@@7: cmp al,[edi-1]
+ je @@6
+ sub ecx,ebx
+ add esi,ecx
+ add edi,ecx
+ inc esi
+ mov ecx,edx
+ jne @@4
+@@8: xor eax,eax
+ jmp @@11
+@@9: mov eax,1
+ jmp @@11
+@@10: sub esi,ebx
+ mov eax,esi
+ sub eax,dword ptr buf
+ inc eax
+@@11: dec eax
+end;
+
+function SensitiveScan(var buf; skip,size: Longint; str: String): Longint; assembler;
+asm
+ mov edi,[buf]
+ add edi,skip
+ mov esi,[str]
+ mov ecx,size
+ sub ecx,skip
+ xor eax,eax
+ jecxz @@3
+ cld
+ lodsb
+ cmp al,1
+ jb @@5
+ ja @@1
+ lodsb
+ repne scasb
+ jne @@3
+ jmp @@5
+@@1: xor ah,ah
+ mov ebx,eax
+ dec ebx
+ mov edx,ecx
+ sub edx,eax
+ jb @@3
+ lodsb
+ add edx,2
+@@2: dec edx
+ mov ecx,edx
+ repne scasb
+ jne @@3
+ mov edx,ecx
+ mov ecx,ebx
+ rep cmpsb
+ je @@4
+ sub ecx,ebx
+ add esi,ecx
+ add edi,ecx
+ inc edi
+ or edx,edx
+ jne @@2
+@@3: xor eax,eax
+ jmp @@6
+@@4: sub edi,ebx
+@@5: mov eax,edi
+ sub eax,dword ptr buf
+@@6: dec eax
+end;
+
+function Compare(var buf1,buf2; size: Longint): Boolean; assembler;
+asm
+ xor edx,edx
+ mov eax,size
+ cmp eax,16
+ jb @@3
+ mov ecx,4
+ div ecx
+ mov ecx,eax
+ jecxz @@1
+ mov esi,[buf1]
+ mov edi,[buf2]
+ cld
+ repz cmpsd
+ jnz @@2
+ mov ecx,edx
+ jecxz @@1
+ repz cmpsb
+ jnz @@2
+@@1: mov al,1
+ jmp @@6
+@@2: xor al,al
+ jmp @@6
+@@3: mov ecx,size
+ jecxz @@4
+ mov esi,[buf1]
+ mov edi,[buf2]
+ cld
+ repz cmpsb
+ jnz @@5
+@@4: mov al,1
+ jmp @@6
+@@5: xor al,al
+@@6:
+end;
+
+function Empty(var buf; size: Longint): Boolean; assembler;
+asm
+ xor edx,edx
+ mov eax,size
+ cmp eax,16
+ jb @@3
+ mov ecx,4
+ div ecx
+ mov ecx,eax
+ jecxz @@1
+ mov edi,[buf]
+ xor eax,eax
+ repz scasd
+ jnz @@2
+ mov ecx,edx
+ jecxz @@1
+ repz scasb
+ jnz @@2
+@@1: mov al,1
+ jmp @@6
+@@2: xor al,al
+ jmp @@6
+@@3: mov ecx,size
+ jecxz @@4
+ mov edi,[buf]
+ xor eax,eax
+ repz scasb
+ jnz @@5
+@@4: mov al,1
+ jmp @@6
+@@5: xor al,al
+@@6:
+end;
+
+function CountLines(var buf; size: Longint): Longint; assembler;
+asm
+ mov edi,[buf]
+ mov ecx,size
+ mov edx,edi
+ add edx,ecx
+ xor ebx,ebx
+ jecxz @@3
+@@1: mov al,0dh
+ repnz scasb
+ jnz @@3
+ cmp byte ptr [edi],0ah
+ jnz @@2
+ inc edi
+ inc ebx
+@@2: cmp edi,edx
+ jb @@1
+@@3: mov eax,ebx
+end;
+
+function Update16(var buf; size: Longint; crc: Word): Word; assembler;
+asm
+ mov esi,[buf]
+ lea edi,[CRC16_table]
+ mov bx,crc
+ mov ecx,size
+ jecxz @@2
+@@1: xor ax,ax
+ lodsb
+ mov dl,bh
+ xor dh,dh
+ xor bh,bh
+ xor bx,ax
+ and ebx,000000ffh
+ shl ebx,1
+ mov bx,[edi+ebx]
+ xor bx,dx
+ loop @@1
+@@2: mov ax,bx
+end;
+
+function Update32(var buf; size: Longint; crc: Longint): Longint; assembler;
+asm
+ mov esi,[buf]
+ lea edi,[CRC32_table]
+ mov ebx,crc
+ mov ecx,size
+ jecxz @@2
+@@1: xor eax,eax
+ lodsb
+ xor ebx,eax
+ mov edx,ebx
+ and ebx,000000ffh
+ shl ebx,2
+ mov ebx,[edi+ebx]
+ shr edx,8
+ and edx,00ffffffh
+ xor ebx,edx
+ loop @@1
+@@2: mov eax,ebx
+end;
+
+procedure make_table_16bit;
+
+var
+ crc: Word;
+ n,index: Byte;
+
+begin
+ For index := 0 to 255 do
+ begin
+ crc := index;
+ For n := 1 to 8 do
+ If Odd(crc) then crc := crc SHR 1 XOR $0a001
+ else crc := crc SHR 1;
+ CRC16_table[index] := crc;
+ end;
+end;
+
+procedure make_table_32bit;
+
+var
+ crc: DWord;
+ n,index: Byte;
+
+begin
+ For index := 0 to 255 do
+ begin
+ crc := index;
+ For n := 1 to 8 do
+ If Odd(crc) then crc := crc SHR 1 XOR $0edb88320
+ else crc := crc SHR 1;
+ CRC32_table[index] := crc;
+ end;
+end;
+
+begin
+ make_table_16bit;
+ make_table_32bit;
+end.
projects / 16.git / blobdiff