isa-l/igzip/lz0a_const.asm

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%include "options.asm"

%assign K      1024
%assign D      IGZIP_HIST_SIZE        ;; Amount of history
%assign LA     18 * 16      ;; Max look-ahead, rounded up to 32 byte boundary
%assign BSIZE  2*IGZIP_HIST_SIZE + LA     ;; Nominal buffer size

;; Constants for stateless compression
%define LAST_BYTES_COUNT	3 ;; Bytes to prevent reading out of array bounds
%define LA_STATELESS	258	;; No round up since no data is copied to a buffer

%assign IGZIP_LVL0_HASH_SIZE  (8 * K)
%assign IGZIP_HASH8K_HASH_SIZE  (8 * K)
%assign IGZIP_HASH_HIST_HASH_SIZE IGZIP_HIST_SIZE
%assign IGZIP_HASH_MAP_HASH_SIZE  IGZIP_HIST_SIZE

%xdefine LVL0_HASH_MASK  (IGZIP_LVL0_HASH_SIZE - 1)
%xdefine HASH8K_HASH_MASK  (IGZIP_HASH8K_HASH_SIZE - 1)
%xdefine HASH_HIST_HASH_MASK  (IGZIP_HASH_HIST_HASH_SIZE - 1)
%xdefine HASH_MAP_HASH_MASK  (IGZIP_HASH_MAP_HASH_SIZE - 1)

%assign MIN_DEF_MATCH 3 	; Minimum length of a match in deflate
%assign SHORTEST_MATCH  4

%assign SLOP 8

%define ICF_CODE_BYTES 4
%define LIT_LEN_BIT_COUNT 10
%define DIST_LIT_BIT_COUNT 9

%define LIT_LEN_MASK ((1 << LIT_LEN_BIT_COUNT) - 1)
%define LIT_DIST_MASK ((1 << DIST_LIT_BIT_COUNT) - 1)

%define DIST_OFFSET	LIT_LEN_BIT_COUNT
%define EXTRA_BITS_OFFSET	(DIST_OFFSET + DIST_LIT_BIT_COUNT)
%define LIT (0x1E << DIST_OFFSET)