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+/* lzo1b_d.ch -- implementation of the LZO1B 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.
+************************************************************************/
+
+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 lzo_uint t;
+ register const lzo_bytep m_pos;
+
+ const lzo_bytep const ip_end = in + in_len;
+#if defined(HAVE_ANY_OP)
+ lzo_bytep const op_end = out + *out_len;
+#endif
+
+ LZO_UNUSED(wrkmem);
+
+ op = out;
+ ip = in;
+
+ while (TEST_IP && TEST_OP)
+ {
+ t = *ip++; /* get marker */
+
+ if (t < R0MIN) /* a literal run */
+ {
+ if (t == 0) /* a R0 literal run */
+ {
+ NEED_IP(1);
+ t = *ip++;
+ if (t >= R0FAST - R0MIN) /* a long R0 run */
+ {
+ t -= R0FAST - R0MIN;
+ if (t == 0)
+ t = R0FAST;
+ else
+ {
+#if 0
+ t = 256u << ((unsigned) t);
+#else
+ /* help the optimizer */
+ lzo_uint tt = 256;
+ do tt <<= 1; while (--t > 0);
+ t = tt;
+#endif
+ }
+
+ NEED_IP(t); NEED_OP(t);
+#if 1 && defined(LZO_UNALIGNED_OK_4)
+ do {
+ UA_COPY32(op+0, ip+0);
+ UA_COPY32(op+4, ip+4);
+ op += 8; ip += 8;
+ t -= 8;
+ } while (t > 0);
+#else
+ MEMCPY8_DS(op,ip,t);
+#endif
+ continue;
+ }
+ t += R0MIN; /* a short R0 run */
+ }
+
+ NEED_IP(t); NEED_OP(t);
+ /* copy literal run */
+#if 1 && defined(LZO_UNALIGNED_OK_4)
+ if (t >= 4)
+ {
+ do {
+ UA_COPY32(op, ip);
+ op += 4; ip += 4; t -= 4;
+ } while (t >= 4);
+ if (t > 0) do *op++ = *ip++; while (--t > 0);
+ }
+ else
+#endif
+ {
+#if (M3O_BITS < 7)
+literal1:
+#endif
+ do *op++ = *ip++; while (--t > 0);
+ }
+
+#if (M3O_BITS == 7)
+literal2:
+#endif
+
+ /* after a literal a match must follow */
+ while (TEST_IP && TEST_OP)
+ {
+ t = *ip++; /* get R1 marker */
+ if (t >= R0MIN)
+ goto match;
+
+ NEED_IP(2); NEED_OP(M2_MIN_LEN + 1);
+
+ /* R1 match - a M2_MIN_LEN match + 1 byte literal */
+ assert((t & M2O_MASK) == t);
+ m_pos = op - M2_MIN_OFFSET;
+ m_pos -= t | (((lzo_uint) *ip++) << M2O_BITS);
+ assert(m_pos >= out); assert(m_pos < op);
+ TEST_LB(m_pos);
+ COPY_M2;
+ *op++ = *ip++;
+ }
+
+#if defined(HAVE_TEST_IP) || defined(HAVE_TEST_OP)
+ break;
+#endif
+ }
+
+match:
+
+ if (t >= M2_MARKER) /* a M2 match */
+ {
+ /* get match offset */
+ NEED_IP(1);
+ m_pos = op - M2_MIN_OFFSET;
+ m_pos -= (t & M2O_MASK) | (((lzo_uint) *ip++) << M2O_BITS);
+ assert(m_pos >= out); assert(m_pos < op);
+ TEST_LB(m_pos);
+
+ /* get match len */
+ t = (t >> M2O_BITS) - 1;
+ NEED_OP(t + M2_MIN_LEN - 1);
+ COPY_M2X;
+ MEMCPY_DS(op,m_pos,t);
+ }
+ else /* a M3 or M4 match */
+ {
+ /* get match len */
+ t &= M3L_MASK;
+ if (t == 0) /* a M4 match */
+ {
+ NEED_IP(1);
+ while (*ip == 0)
+ {
+ t += 255;
+ ip++;
+ NEED_IP(1);
+ }
+ t += (M4_MIN_LEN - M3_MIN_LEN) + *ip++;
+ }
+
+ /* get match offset */
+ NEED_IP(2);
+ m_pos = op - (M3_MIN_OFFSET - M3_EOF_OFFSET);
+ m_pos -= *ip++ & M3O_MASK;
+ m_pos -= (lzo_uint)(*ip++) << M3O_BITS;
+#if defined(LZO_EOF_CODE)
+ if (m_pos == op)
+ goto eof_found;
+#endif
+
+ /* copy match */
+ assert(m_pos >= out); assert(m_pos < op);
+ TEST_LB(m_pos); NEED_OP(t + M3_MIN_LEN - 1);
+#if defined(LZO_UNALIGNED_OK_4)
+ if (t >= 2 * 4 - (M3_MIN_LEN - 1) && (op - m_pos) >= 4)
+ {
+ UA_COPY32(op, m_pos);
+ op += 4; m_pos += 4; t -= 4 - (M3_MIN_LEN - 1);
+ do {
+ UA_COPY32(op, m_pos);
+ op += 4; m_pos += 4; t -= 4;
+ } while (t >= 4);
+ if (t > 0) do *op++ = *m_pos++; while (--t > 0);
+ }
+ else
+#endif
+ {
+ COPY_M3X;
+ MEMCPY_DS(op,m_pos,t);
+ }
+
+
+#if (M3O_BITS < 7)
+ t = ip[-2] >> M3O_BITS;
+ if (t)
+ {
+ NEED_IP(t); NEED_OP(t);
+ goto literal1;
+ }
+#elif (M3O_BITS == 7)
+ /* optimized version */
+ if (ip[-2] & (1 << M3O_BITS))
+ {
+ NEED_IP(1); NEED_OP(1);
+ *op++ = *ip++;
+ goto literal2;
+ }
+#endif
+ }
+ }
+
+
+#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
+*/
+