Initial import

1 files changed, 282 insertions, 0 deletions

diff --git a/lzo/src/lzo1b_d.ch b/lzo/src/lzo1b_d.ch
new file mode 100644
index 00000000..e38fad58
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+++ b/lzo/src/lzo1b_d.ch
@@ -0,0 +1,282 @@
+/* lzo1b_d.ch -- implementation of the LZO1B decompression algorithm
+
+   This file is part of the LZO real-time data compression library.
+
+   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 {
+                        * (lzo_uint32p) (op+0) = * (const lzo_uint32p) (ip+0);
+                        * (lzo_uint32p) (op+4) = * (const lzo_uint32p) (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 {
+                    * (lzo_uint32p) op = * (const lzo_uint32p) 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)
+            {
+                * (lzo_uint32p) op = * (const lzo_uint32p) m_pos;
+                op += 4; m_pos += 4; t -= 4 - (M3_MIN_LEN - 1);
+                do {
+                    * (lzo_uint32p) op = * (const lzo_uint32p) 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
+*/
+