leave.ash

开源的压缩算法 lzo 源码 ,open VPN 就是用这个算法

/* leave.ash -- LZO assembler stuff

   This file is part of the LZO real-time data compression library.

   Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
   Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
   All Rights Reserved.

   The LZO library is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License,
   version 2, as published by the Free Software Foundation.

   The LZO library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with the LZO library; see the file COPYING.
   If not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

   Markus F.X.J. Oberhumer
   <[e-mail]>
   http://www.oberhumer.com/opensource/lzo/
 */


/***********************************************************************
//
************************************************************************/

/* check uncompressed size */
#if defined(LZO_TEST_DECOMPRESS_OVERRUN_OUTPUT)
        cmpl    OUTEND,%edi
        ja      .L_output_overrun
#endif

/* check compressed size */
        movl    INP,%edx
        addl    INS,%edx
        cmpl    %edx,%esi       /* check compressed size */
        ja      .L_input_overrun
        jb      .L_input_not_consumed

.L_leave:
        subl    OUTP,%edi       /* write back the uncompressed size */
        movl    OUTS,%edx
        movl    %edi,(%edx)

        negl    %eax
        addl    $12,%esp
        popl    %edx
        popl    %ecx
        popl    %ebx
        popl    %esi
        popl    %edi
        popl    %ebp
#if 1
        ret
#else
        jmp     .L_end
#endif


.L_error:
        movl    $1,%eax         /* LZO_E_ERROR */
        jmp     .L_leave

.L_input_not_consumed:
        movl    $8,%eax         /* LZO_E_INPUT_NOT_CONSUMED */
        jmp     .L_leave

.L_input_overrun:
        movl    $4,%eax         /* LZO_E_INPUT_OVERRUN */
        jmp     .L_leave

#if defined(LZO_TEST_DECOMPRESS_OVERRUN_OUTPUT)
.L_output_overrun:
        movl    $5,%eax         /* LZO_E_OUTPUT_OVERRUN */
        jmp     .L_leave
#endif

#if defined(LZO_TEST_DECOMPRESS_OVERRUN_LOOKBEHIND)
.L_lookbehind_overrun:
        movl    $6,%eax         /* LZO_E_LOOKBEHIND_OVERRUN */
        jmp     .L_leave
#endif

#if defined(LZO_DEBUG)
.L_assert_fail:
        movl    $99,%eax
        jmp     .L_leave
#endif

.L_end:


/*
vi:ts=4
*/