diff options
Diffstat (limited to 'win32/crc_lcc.asm')
| -rw-r--r-- | win32/crc_lcc.asm | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/win32/crc_lcc.asm b/win32/crc_lcc.asm new file mode 100644 index 0000000..1538d32 --- /dev/null +++ b/win32/crc_lcc.asm @@ -0,0 +1,166 @@ +;=========================================================================== +; 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 |