# define LZX_DEBUG(format, ...)
#endif
-
-/* Constants, some defined by the LZX specification: */
+/* Constants, most of which are defined by the LZX specification: */
/* The smallest and largest allowed match lengths. */
#define LZX_MIN_MATCH 2
/* Number of values an uncompressed literal byte can represent. */
#define LZX_NUM_CHARS 256
-/* Each LZX block begins with 3 bits that determines the block type: */
+/* Each LZX block begins with 3 bits that determines the block type. Below are
+ * the valid block types. Values 0, and 4 through 7, are invalid. */
#define LZX_BLOCKTYPE_VERBATIM 1
#define LZX_BLOCKTYPE_ALIGNED 2
#define LZX_BLOCKTYPE_UNCOMPRESSED 3
-/* values 0, and 4 through 7, are invalid. */
-
#define LZX_NUM_PRIMARY_LENS 7 /* this one missing from spec! */
-/* Only valid for 32768 block size! */
+/* NOTE: There are really 51 position slots in the LZX format as a whole, but
+ * only 30 are needed to allow for the window to be up to 32768 bytes long,
+ * which is the maximum in the WIM format. */
#define LZX_NUM_POSITION_SLOTS 30
/* Read the LZX specification for information about the Huffman trees used in
#define LZX_PRETREE_TABLEBITS 6
#define LZX_PRETREE_ELEMENT_SIZE 4
-
#define LZX_ALIGNEDTREE_NUM_SYMBOLS 8
#define LZX_ALIGNEDTREE_TABLEBITS 7
#define LZX_ALIGNEDTREE_ELEMENT_SIZE 3
* different as well. */
#define LZX_MAGIC_FILESIZE 12000000
-extern const u8 lzx_extra_bits[51];
-extern const u32 lzx_position_base[51];
+extern const u8 lzx_extra_bits[LZX_NUM_POSITION_SLOTS];
+extern const u32 lzx_position_base[LZX_NUM_POSITION_SLOTS];
/* Least-recently used queue for match offsets. */
struct lru_queue {