The pkg-config variables have no default value.

[libucw.git] / lib / lizard.c

diff --git a/lib/lizard.c b/lib/lizard.c
index 945fe877242cd377e7979e53852912b238c2ac67..1da67ccddfc57dde8067e04689b9cbf034d39a8d 100644 (file)
--- a/lib/lizard.c
+++ b/lib/lizard.c
@@ -6,7 +6,7 @@
  *     This software may be freely distributed and used according to the terms
  *     of the GNU Lesser General Public License.
  *
- *     The file format is based on LZO1X and 
+ *     The file format is based on LZO1X and
  *     the compression method is based on zlib.
  */
 
@@ -28,25 +28,25 @@ struct hash_record {
 #define        CHAIN_GOOD_MATCH        32      // we already have a good match => end
 
 static inline uns
-hashf(byte *string)
+hashf(const byte *string)
   /* 0..HASH_SIZE-1 */
 {
     return string[0] ^ (string[1]<<3) ^ (string[2]<<6);
 }
 
 static inline byte *
-locate_string(byte *string, int record_id, int head)
+locate_string(const byte *string, int record_id, int head)
   /* The strings are recorded into the hash-table regularly, hence there is no
    * need to store the pointer there.  */
 {
   string += record_id - head;
   if (record_id >= head)
     string -= HASH_RECORDS-1;
-  return string;
+  return (byte *)string;
 }
 
 static inline uns
-find_match(uns record_id, struct hash_record *hash_rec, byte *string, byte *string_end, byte **best_ptr, uns head)
+find_match(uns record_id, struct hash_record *hash_rec, const byte *string, const byte *string_end, byte **best_ptr, uns head)
   /* hash_tab[hash] == record_id points to the head of the double-linked
    * link-list of strings with the same hash.  The records are statically
    * stored in circular array hash_rec (with the 1st entry unused), and the
@@ -68,7 +68,7 @@ find_match(uns record_id, struct hash_record *hash_rec, byte *string, byte *stri
        if (*cmp++ == string[4] && *cmp++ == string[5]
            && *cmp++ == string[6] && *cmp++ == string[7])
        {
-         byte *str = string + 8;
+         const byte *str = string + 8;
          while (str <= string_end && *cmp++ == *str++);
        }
       }
@@ -128,7 +128,7 @@ dump_unary_value(byte *out, uns l)
 }
 
 static byte *
-flush_copy_command(uns bof, byte *out, byte *start, uns len)
+flush_copy_command(uns bof, byte *out, const byte *start, uns len)
 {
   if (bof && len <= 238)
     *out++ = len + 17;
@@ -161,23 +161,23 @@ flush_copy_command(uns bof, byte *out, byte *start, uns len)
 }
 
 int
-lizard_compress(byte *in, uns in_len, byte *out)
+lizard_compress(const byte *in, uns in_len, byte *out)
   /* Requires out being allocated for at least in_len * LIZARD_MAX_MULTIPLY +
    * LIZARD_MAX_ADD.  There must be at least LIZARD_NEEDS_CHARS characters
    * allocated after in.  Returns the actual compressed length. */
 {
   hash_ptr_t hash_tab[HASH_SIZE];
   struct hash_record hash_rec[HASH_RECORDS];
-  byte *in_end = in + in_len;
+  const byte *in_end = in + in_len;
   byte *out_start = out;
-  byte *copy_start = in;
+  const byte *copy_start = in;
   uns head = 1;                                        /* 0 in unused */
   uns to_delete = 0, bof = 1;
   bzero(hash_tab, sizeof(hash_tab));           /* init the hash-table */
   while (in < in_end)
   {
     uns hash = hashf(in);
-    byte *best;
+    byte *best = NULL;
     uns len = find_match(hash_tab[hash], hash_rec, in, in_end, &best, head);
     if (len < 3)
 #if 0                  // TODO: now, our routine does not detect matches of length 2
@@ -280,18 +280,18 @@ dump_2sequence:
 }
 
 static inline byte *
-read_unary_value(byte *in, uns *val)
+read_unary_value(const byte *in, uns *val)
 {
   uns l = 0;
   while (!*in++)
     l += 255;
   l += in[-1];
   *val = l;
-  return in;
+  return (byte *)in;
 }
 
 int
-lizard_decompress(byte *in, byte *out)
+lizard_decompress(const byte *in, byte *out)
   /* Requires out being allocated for the decompressed length must be known
    * beforehand.  It is desirable to lock the following memory page for
    * read-only access to prevent buffer overflow.  Returns the actual
@@ -450,7 +450,7 @@ long.  Decode sequences of these types until the EOF or END marker is read.
     C following characters will be copied from the compressed text to the
     output.  The number CC is always stored in the 2 least significant bits of
     the second last byte of the sequence.
-    
+
     If END is read, the algorithm switches to the copy mode.
 
 pattern                                        length          position