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+/* lzo2a_d.ch -- implementation of the LZO2A decompression algorithm
+
+ This file is part of the LZO real-time data compression library.
+
+ Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
+ Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
+ 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 as
+ published by the Free Software Foundation; either version 2 of
+ the License, or (at your option) any later version.
+
+ 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
+ <markus@oberhumer.com>
+ http://www.oberhumer.com/opensource/lzo/
+ */
+
+
+#include "lzo1_d.ch"
+
+
+/***********************************************************************
+// decompress a block of data.
+************************************************************************/
+
+#define _NEEDBYTE NEED_IP(1)
+#define _NEXTBYTE (*ip++)
+
+LZO_PUBLIC(int)
+DO_DECOMPRESS ( const lzo_bytep in , lzo_uint in_len,
+ lzo_bytep out, lzo_uintp out_len,
+ lzo_voidp wrkmem )
+{
+ register lzo_bytep op;
+ register const lzo_bytep ip;
+ register const lzo_bytep m_pos;
+
+ lzo_uint t;
+ const lzo_bytep const ip_end = in + in_len;
+#if defined(HAVE_ANY_OP)
+ lzo_bytep const op_end = out + *out_len;
+#endif
+
+ lzo_uint32 b = 0; /* bit buffer */
+ unsigned k = 0; /* bits in bit buffer */
+
+ LZO_UNUSED(wrkmem);
+
+ op = out;
+ ip = in;
+
+ while (TEST_IP && TEST_OP)
+ {
+ NEEDBITS(1);
+ if (MASKBITS(1) == 0)
+ {
+ DUMPBITS(1);
+ /* a literal */
+ NEED_IP(1); NEED_OP(1);
+ *op++ = *ip++;
+ continue;
+ }
+ DUMPBITS(1);
+
+ NEEDBITS(1);
+ if (MASKBITS(1) == 0)
+ {
+ DUMPBITS(1);
+ /* a M1 match */
+ NEEDBITS(2);
+ t = M1_MIN_LEN + (lzo_uint) MASKBITS(2);
+ DUMPBITS(2);
+ NEED_IP(1); NEED_OP(t);
+ m_pos = op - 1 - *ip++;
+ assert(m_pos >= out); assert(m_pos < op);
+ TEST_LB(m_pos);
+ MEMCPY_DS(op,m_pos,t);
+ continue;
+ }
+ DUMPBITS(1);
+
+ NEED_IP(2);
+ t = *ip++;
+ m_pos = op;
+ m_pos -= (t & 31) | (((lzo_uint) *ip++) << 5);
+ t >>= 5;
+ if (t == 0)
+ {
+#if (SWD_N >= 8192)
+ NEEDBITS(1);
+ t = MASKBITS(1);
+ DUMPBITS(1);
+ if (t == 0)
+ t = 10 - 1;
+ else
+ {
+ /* a M3 match */
+ m_pos -= 8192; /* t << 13 */
+ t = M3_MIN_LEN - 1;
+ }
+#else
+ t = 10 - 1;
+#endif
+ NEED_IP(1);
+ while (*ip == 0)
+ {
+ t += 255;
+ ip++;
+ NEED_IP(1);
+ }
+ t += *ip++;
+ }
+ else
+ {
+#if defined(LZO_EOF_CODE)
+ if (m_pos == op)
+ goto eof_found;
+#endif
+ t += 2;
+ }
+ assert(m_pos >= out); assert(m_pos < op);
+ TEST_LB(m_pos);
+ NEED_OP(t);
+ MEMCPY_DS(op,m_pos,t);
+ }
+
+
+#if defined(LZO_EOF_CODE)
+#if defined(HAVE_TEST_IP) || defined(HAVE_TEST_OP)
+ /* no EOF code was found */
+ *out_len = pd(op, out);
+ return LZO_E_EOF_NOT_FOUND;
+#endif
+
+eof_found:
+ assert(t == 1);
+#endif
+ *out_len = pd(op, out);
+ return (ip == ip_end ? LZO_E_OK :
+ (ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
+
+
+#if defined(HAVE_NEED_IP)
+input_overrun:
+ *out_len = pd(op, out);
+ return LZO_E_INPUT_OVERRUN;
+#endif
+
+#if defined(HAVE_NEED_OP)
+output_overrun:
+ *out_len = pd(op, out);
+ return LZO_E_OUTPUT_OVERRUN;
+#endif
+
+#if defined(LZO_TEST_OVERRUN_LOOKBEHIND)
+lookbehind_overrun:
+ *out_len = pd(op, out);
+ return LZO_E_LOOKBEHIND_OVERRUN;
+#endif
+}
+
+
+/*
+vi:ts=4:et
+*/
+