diff options
Diffstat (limited to 'src/pkg/compress/flate/token.go')
| -rw-r--r-- | src/pkg/compress/flate/token.go | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/src/pkg/compress/flate/token.go b/src/pkg/compress/flate/token.go deleted file mode 100644 index 4d4917687..000000000 --- a/src/pkg/compress/flate/token.go +++ /dev/null @@ -1,102 +0,0 @@ -// Copyright 2009 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package flate - -const ( - // 2 bits: type 0 = literal 1=EOF 2=Match 3=Unused - // 8 bits: xlength = length - MIN_MATCH_LENGTH - // 22 bits xoffset = offset - MIN_OFFSET_SIZE, or literal - lengthShift = 22 - offsetMask = 1<<lengthShift - 1 - typeMask = 3 << 30 - literalType = 0 << 30 - matchType = 1 << 30 -) - -// The length code for length X (MIN_MATCH_LENGTH <= X <= MAX_MATCH_LENGTH) -// is lengthCodes[length - MIN_MATCH_LENGTH] -var lengthCodes = [...]uint32{ - 0, 1, 2, 3, 4, 5, 6, 7, 8, 8, - 9, 9, 10, 10, 11, 11, 12, 12, 12, 12, - 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, - 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, - 17, 17, 17, 17, 17, 17, 17, 17, 18, 18, - 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, - 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, - 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, - 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, - 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, - 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, - 22, 22, 23, 23, 23, 23, 23, 23, 23, 23, - 23, 23, 23, 23, 23, 23, 23, 23, 24, 24, - 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, - 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, - 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, - 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, - 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, - 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, - 25, 25, 26, 26, 26, 26, 26, 26, 26, 26, - 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, - 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, - 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, - 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, - 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, - 27, 27, 27, 27, 27, 28, -} - -var offsetCodes = [...]uint32{ - 0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, - 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, - 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, - 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, - 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, - 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, - 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, - 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, -} - -type token uint32 - -// Convert a literal into a literal token. -func literalToken(literal uint32) token { return token(literalType + literal) } - -// Convert a < xlength, xoffset > pair into a match token. -func matchToken(xlength uint32, xoffset uint32) token { - return token(matchType + xlength<<lengthShift + xoffset) -} - -// Returns the type of a token -func (t token) typ() uint32 { return uint32(t) & typeMask } - -// Returns the literal of a literal token -func (t token) literal() uint32 { return uint32(t - literalType) } - -// Returns the extra offset of a match token -func (t token) offset() uint32 { return uint32(t) & offsetMask } - -func (t token) length() uint32 { return uint32((t - matchType) >> lengthShift) } - -func lengthCode(len uint32) uint32 { return lengthCodes[len] } - -// Returns the offset code corresponding to a specific offset -func offsetCode(off uint32) uint32 { - const n = uint32(len(offsetCodes)) - switch { - case off < n: - return offsetCodes[off] - case off>>7 < n: - return offsetCodes[off>>7] + 14 - default: - return offsetCodes[off>>14] + 28 - } -} |