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Remove duplicate kBlockLengthPrefixCode constants.

This commit is contained in:
Andy Balholm 2019-03-15 17:27:29 -07:00
parent 7b66c0a2f2
commit 4e6528a75b
2 changed files with 4 additions and 124 deletions
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8
decode.go
View File

@ -925,8 +925,8 @@ func readBlockLength(table []huffmanCode, br *bitReader) uint32 {
var code uint32 var code uint32
var nbits uint32 var nbits uint32
code = readSymbol(table, br) code = readSymbol(table, br)
nbits = uint32(kBlockLengthPrefixCode1[code].nbits) /* nbits == 2..24 */ nbits = kBlockLengthPrefixCode[code].nbits /* nbits == 2..24 */
return uint32(kBlockLengthPrefixCode1[code].offset) + readBits(br, nbits) return kBlockLengthPrefixCode[code].offset + readBits(br, nbits)
} }
/* WARNING: if state is not BROTLI_STATE_READ_BLOCK_LENGTH_NONE, then /* WARNING: if state is not BROTLI_STATE_READ_BLOCK_LENGTH_NONE, then
@ -942,14 +942,14 @@ func safeReadBlockLength(s *Reader, result *uint32, table []huffmanCode, br *bit
} }
{ {
var bits uint32 /* nbits == 2..24 */ var bits uint32 /* nbits == 2..24 */
var nbits uint32 = uint32(kBlockLengthPrefixCode1[index].nbits) var nbits uint32 = kBlockLengthPrefixCode[index].nbits
if !safeReadBits(br, nbits, &bits) { if !safeReadBits(br, nbits, &bits) {
s.block_length_index = index s.block_length_index = index
s.substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_SUFFIX s.substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_SUFFIX
return false return false
} }
*result = uint32(kBlockLengthPrefixCode1[index].offset) + bits *result = kBlockLengthPrefixCode[index].offset + bits
s.substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_NONE s.substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_NONE
return true return true
} }

120
prefix_dec.go
View File

@ -6,126 +6,6 @@ package brotli
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/ */
/* Lookup tables to map prefix codes to value ranges. This is used during
decoding of the block lengths, literal insertion lengths and copy lengths. */
/* Represents the range of values belonging to a prefix code:
[offset, offset + 2^nbits) */
type prefixCodeRange1 struct {
offset uint16
nbits byte
}
var kBlockLengthPrefixCode1 = [numBlockLenSymbols]struct {
offset uint16
nbits byte
}{
struct {
offset uint16
nbits byte
}{1, 2},
struct {
offset uint16
nbits byte
}{5, 2},
struct {
offset uint16
nbits byte
}{9, 2},
struct {
offset uint16
nbits byte
}{13, 2},
struct {
offset uint16
nbits byte
}{17, 3},
struct {
offset uint16
nbits byte
}{25, 3},
struct {
offset uint16
nbits byte
}{33, 3},
struct {
offset uint16
nbits byte
}{41, 3},
struct {
offset uint16
nbits byte
}{49, 4},
struct {
offset uint16
nbits byte
}{65, 4},
struct {
offset uint16
nbits byte
}{81, 4},
struct {
offset uint16
nbits byte
}{97, 4},
struct {
offset uint16
nbits byte
}{113, 5},
struct {
offset uint16
nbits byte
}{145, 5},
struct {
offset uint16
nbits byte
}{177, 5},
struct {
offset uint16
nbits byte
}{209, 5},
struct {
offset uint16
nbits byte
}{241, 6},
struct {
offset uint16
nbits byte
}{305, 6},
struct {
offset uint16
nbits byte
}{369, 7},
struct {
offset uint16
nbits byte
}{497, 8},
struct {
offset uint16
nbits byte
}{753, 9},
struct {
offset uint16
nbits byte
}{1265, 10},
struct {
offset uint16
nbits byte
}{2289, 11},
struct {
offset uint16
nbits byte
}{4337, 12},
struct {
offset uint16
nbits byte
}{8433, 13},
struct {
offset uint16
nbits byte
}{16625, 24},
}
type CmdLutElement struct { type CmdLutElement struct {
insert_len_extra_bits byte insert_len_extra_bits byte
copy_len_extra_bits byte copy_len_extra_bits byte