forked from KolibriOS/kolibrios
167 lines
3.3 KiB
NASM
167 lines
3.3 KiB
NASM
|
;===========================================================================
|
||
|
|
; Copyright (c) 1990-2006 Info-ZIP. All rights reserved.
|
||
|
|
;
|
||
|
|
; See the accompanying file LICENSE, version 2000-Apr-09 or later
|
||
|
|
; (the contents of which are also included in zip.h) for terms of use.
|
||
|
|
; If, for some reason, all these files are missing, the Info-ZIP license
|
||
|
|
; also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
|
||
|
|
;===========================================================================
|
||
|
|
; crc_lcc.asm, optimized CRC calculation function for Zip and UnZip,
|
||
|
|
; created by Paul Kienitz and Christian Spieler. Last revised 02 Jan 2006.
|
||
|
|
;
|
||
|
|
; The code in this file has been copied verbatim from crc_i386.{asm|S};
|
||
|
|
; only the assembler syntax and metacommands have been adapted to
|
||
|
|
; the habits of the free LCC-Win32 C compiler package.
|
||
|
|
; This version of the code uses the "optimized for i686" variant of
|
||
|
|
; crc_i386.{asm|S}.
|
||
|
|
; IMPORTANT NOTE to the Info-ZIP editors:
|
||
|
|
; The TAB characters in this source file are required by the parser of
|
||
|
|
; the LCC-Win32 assembler program and MUST NOT be removed!!
|
||
|
|
;
|
||
|
|
; For more information (and a revision log), look into the original
|
||
|
|
; source files.
|
||
|
|
;
|
||
|
|
.text
|
||
|
|
.file "crc32.c"
|
||
|
|
.text
|
||
|
|
.type _crc32,function
|
||
|
|
_crc32:
|
||
|
|
pushl %ebp
|
||
|
|
movl %esp,%ebp
|
||
|
|
pushl %ecx
|
||
|
|
pushl %ebx
|
||
|
|
pushl %esi
|
||
|
|
pushl %edi
|
||
|
|
.line 34
|
||
|
|
.line 37
|
||
|
|
movl 12(%ebp),%esi
|
||
|
|
subl %eax,%eax
|
||
|
|
testl %esi,%esi
|
||
|
|
jz _$3
|
||
|
|
.line 39
|
||
|
|
call _get_crc_table
|
||
|
|
movl %eax,%edi
|
||
|
|
.line 41
|
||
|
|
movl 8(%ebp),%eax
|
||
|
|
movl 16(%ebp),%ecx
|
||
|
|
notl %eax
|
||
|
|
testl %ecx,%ecx
|
||
|
|
jz _$4
|
||
|
|
_$5:
|
||
|
|
testl $3,%esi
|
||
|
|
jz _$6
|
||
|
|
xorb (%esi),%al
|
||
|
|
incl %esi
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
decl %ecx
|
||
|
|
jnz _$5
|
||
|
|
_$6:
|
||
|
|
movl %ecx,%edx
|
||
|
|
shrl $4,%ecx
|
||
|
|
jz _$8
|
||
|
|
_$7:
|
||
|
|
xorl (%esi),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
xorl 4(%esi),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
xorl 8(%esi),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
xorl 12(%esi),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
addl $16,%esi
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
decl %ecx
|
||
|
|
jnz _$7
|
||
|
|
_$8:
|
||
|
|
movl %edx,%ecx
|
||
|
|
andl $0x0f,%ecx
|
||
|
|
shrl $2,%ecx
|
||
|
|
jz _$10
|
||
|
|
_$9:
|
||
|
|
xorl (%esi),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
addl $4,%esi
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
decl %ecx
|
||
|
|
jnz _$9
|
||
|
|
_$10:
|
||
|
|
movl %edx,%ecx
|
||
|
|
andl $0x03,%ecx
|
||
|
|
jz _$4
|
||
|
|
_$11:
|
||
|
|
xorb (%esi),%al
|
||
|
|
incl %esi
|
||
|
|
movzbl %al,%ebx
|
||
|
|
shrl $8,%eax
|
||
|
|
xorl (%edi,%ebx,4),%eax
|
||
|
|
decl %ecx
|
||
|
|
jnz _$11
|
||
|
|
_$4:
|
||
|
|
xorl $0xffffffff,%eax
|
||
|
|
_$3:
|
||
|
|
.line 52
|
||
|
|
popl %edi
|
||
|
|
popl %esi
|
||
|
|
popl %ebx
|
||
|
|
leave
|
||
|
|
ret
|
||
|
|
_$34:
|
||
|
|
.size _crc32,_$34-_crc32
|
||
|
|
.globl _crc32
|
||
|
|
.extern _get_crc_table
|