Use LGPLv3+ for src/*.c

[wimlib] / src / lzx-decompress.c

diff --git a/src/lzx-decompress.c b/src/lzx-decompress.c
index c8ce9b049c025aa713367d74775c4920c0fe8f71..4c7694b6ceace040d84040d3c49064cba119fd57 100644 (file)
--- a/src/lzx-decompress.c
+++ b/src/lzx-decompress.c
@@ -7,20 +7,18 @@
 /*
  * Copyright (C) 2012, 2013, 2014 Eric Biggers
  *
- * This file is part of wimlib, a library for working with WIM files.
+ * This file is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your option) any
+ * later version.
  *
- * wimlib 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 3 of the License, or (at your option)
- * any later version.
- *
- * wimlib 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
+ * This file 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 Lesser General Public License for more
  * details.
  *
- * You should have received a copy of the GNU General Public License
- * along with wimlib; if not, see http://www.gnu.org/licenses/.
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this file; if not, see http://www.gnu.org/licenses/.
  */
 
 /*
@@ -427,9 +425,10 @@ lzx_decompress_block(int block_type, u32 block_size,
        u8 *window_end = window_ptr + block_size;
        unsigned mainsym;
        u32 match_len;
-       unsigned position_slot;
+       unsigned offset_slot;
        u32 match_offset;
        unsigned num_extra_bits;
+       unsigned ones_if_aligned = 0U - (block_type == LZX_BLOCKTYPE_ALIGNED);
 
        while (window_ptr != window_end) {
 
@@ -442,40 +441,42 @@ lzx_decompress_block(int block_type, u32 block_size,
 
                /* Match  */
 
-               /* Decode the length header and position slot.  */
+               /* Decode the length header and offset slot.  */
                mainsym -= LZX_NUM_CHARS;
                match_len = mainsym & 0x7;
-               position_slot = mainsym >> 3;
+               offset_slot = mainsym >> 3;
 
                /* If needed, read a length symbol to decode the full length. */
                if (match_len == 0x7)
                        match_len += read_huffsym_using_lencode(istream, tables);
                match_len += LZX_MIN_MATCH_LEN;
 
-               if (position_slot <= 2) {
+               if (offset_slot <= 2) {
                        /* Repeat offset  */
 
                        /* Note: This isn't a real LRU queue, since using the R2
                         * offset doesn't bump the R1 offset down to R2.  This
                         * quirk allows all 3 recent offsets to be handled by
                         * the same code.  (For R0, the swap is a no-op.)  */
-                       match_offset = queue->R[position_slot];
-                       queue->R[position_slot] = queue->R[0];
+                       match_offset = queue->R[offset_slot];
+                       queue->R[offset_slot] = queue->R[0];
                        queue->R[0] = match_offset;
                } else {
                        /* Explicit offset  */
 
                        /* Look up the number of extra bits that need to be read
-                        * to decode offsets with this position slot.  */
-                       num_extra_bits = lzx_get_num_extra_bits(position_slot);
+                        * to decode offsets with this offset slot.  */
+                       num_extra_bits = lzx_extra_offset_bits[offset_slot];
 
-                       /* Start with the position slot base value.  */
-                       match_offset = lzx_position_base[position_slot];
+                       /* Start with the offset slot base value.  */
+                       match_offset = lzx_offset_slot_base[offset_slot];
 
                        /* In aligned offset blocks, the low-order 3 bits of
                         * each offset are encoded using the aligned offset
                         * code.  Otherwise, all the extra bits are literal.  */
-                       if (block_type == LZX_BLOCKTYPE_ALIGNED && num_extra_bits >= 3) {
+
+                       /*if (block_type == LZX_BLOCKTYPE_ALIGNED && num_extra_bits >= 3) {*/
+                       if ((num_extra_bits & ones_if_aligned) >= 3) {
                                match_offset += bitstream_read_bits(istream, num_extra_bits - 3) << 3;
                                match_offset += read_huffsym_using_alignedcode(istream, tables);
                        } else {