663 lines
17 KiB
Go
663 lines
17 KiB
Go
package brotli
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import "encoding/binary"
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/* Copyright 2013 Google Inc. All Rights Reserved.
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Distributed under MIT license.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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/* Class to model the static dictionary. */
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const maxStaticDictionaryMatchLen = 37
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const kInvalidMatch uint32 = 0xFFFFFFF
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/* Copyright 2013 Google Inc. All Rights Reserved.
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Distributed under MIT license.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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func hash(data []byte) uint32 {
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var h uint32 = binary.LittleEndian.Uint32(data) * kDictHashMul32
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/* The higher bits contain more mixture from the multiplication,
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so we take our results from there. */
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return h >> uint(32-kDictNumBits)
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}
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func addMatch(distance uint, len uint, len_code uint, matches []uint32) {
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var match uint32 = uint32((distance << 5) + len_code)
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matches[len] = brotli_min_uint32_t(matches[len], match)
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}
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func dictMatchLength(dict *dictionary, data []byte, id uint, len uint, maxlen uint) uint {
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var offset uint = uint(dict.offsets_by_length[len]) + len*id
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return findMatchLengthWithLimit(dict.data[offset:], data, brotli_min_size_t(uint(len), maxlen))
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}
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func isMatch(d *dictionary, w dictWord, data []byte, max_length uint) bool {
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if uint(w.len) > max_length {
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return false
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} else {
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var offset uint = uint(d.offsets_by_length[w.len]) + uint(w.len)*uint(w.idx)
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var dict []byte = d.data[offset:]
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if w.transform == 0 {
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/* Match against base dictionary word. */
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return findMatchLengthWithLimit(dict, data, uint(w.len)) == uint(w.len)
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} else if w.transform == 10 {
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/* Match against uppercase first transform.
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Note that there are only ASCII uppercase words in the lookup table. */
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return dict[0] >= 'a' && dict[0] <= 'z' && (dict[0]^32) == data[0] && findMatchLengthWithLimit(dict[1:], data[1:], uint(w.len)-1) == uint(w.len-1)
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} else {
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/* Match against uppercase all transform.
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Note that there are only ASCII uppercase words in the lookup table. */
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var i uint
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for i = 0; i < uint(w.len); i++ {
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if dict[i] >= 'a' && dict[i] <= 'z' {
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if (dict[i] ^ 32) != data[i] {
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return false
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}
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} else {
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if dict[i] != data[i] {
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return false
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}
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}
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}
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return true
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}
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}
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}
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func findAllStaticDictionaryMatches(dict *encoderDictionary, data []byte, min_length uint, max_length uint, matches []uint32) bool {
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var has_found_match bool = false
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{
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var offset uint = uint(dict.buckets[hash(data)])
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var end bool = offset == 0
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for !end {
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w := dict.dict_words[offset]
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offset++
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var l uint = uint(w.len) & 0x1F
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var n uint = uint(1) << dict.words.size_bits_by_length[l]
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var id uint = uint(w.idx)
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end = !(w.len&0x80 == 0)
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w.len = byte(l)
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if w.transform == 0 {
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var matchlen uint = dictMatchLength(dict.words, data, id, l, max_length)
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var s []byte
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var minlen uint
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var maxlen uint
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var len uint
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/* Transform "" + BROTLI_TRANSFORM_IDENTITY + "" */
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if matchlen == l {
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addMatch(id, l, l, matches)
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has_found_match = true
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}
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/* Transforms "" + BROTLI_TRANSFORM_OMIT_LAST_1 + "" and
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"" + BROTLI_TRANSFORM_OMIT_LAST_1 + "ing " */
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if matchlen >= l-1 {
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addMatch(id+12*n, l-1, l, matches)
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if l+2 < max_length && data[l-1] == 'i' && data[l] == 'n' && data[l+1] == 'g' && data[l+2] == ' ' {
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addMatch(id+49*n, l+3, l, matches)
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}
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has_found_match = true
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}
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/* Transform "" + BROTLI_TRANSFORM_OMIT_LAST_# + "" (# = 2 .. 9) */
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minlen = min_length
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if l > 9 {
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minlen = brotli_max_size_t(minlen, l-9)
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}
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maxlen = brotli_min_size_t(matchlen, l-2)
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for len = minlen; len <= maxlen; len++ {
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var cut uint = l - len
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var transform_id uint = (cut << 2) + uint((dict.cutoffTransforms>>(cut*6))&0x3F)
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addMatch(id+transform_id*n, uint(len), l, matches)
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has_found_match = true
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}
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if matchlen < l || l+6 >= max_length {
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continue
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}
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s = data[l:]
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/* Transforms "" + BROTLI_TRANSFORM_IDENTITY + <suffix> */
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if s[0] == ' ' {
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addMatch(id+n, l+1, l, matches)
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if s[1] == 'a' {
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if s[2] == ' ' {
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addMatch(id+28*n, l+3, l, matches)
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} else if s[2] == 's' {
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if s[3] == ' ' {
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addMatch(id+46*n, l+4, l, matches)
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}
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} else if s[2] == 't' {
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if s[3] == ' ' {
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addMatch(id+60*n, l+4, l, matches)
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}
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} else if s[2] == 'n' {
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if s[3] == 'd' && s[4] == ' ' {
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addMatch(id+10*n, l+5, l, matches)
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}
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}
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} else if s[1] == 'b' {
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if s[2] == 'y' && s[3] == ' ' {
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addMatch(id+38*n, l+4, l, matches)
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}
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} else if s[1] == 'i' {
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if s[2] == 'n' {
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if s[3] == ' ' {
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addMatch(id+16*n, l+4, l, matches)
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}
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} else if s[2] == 's' {
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if s[3] == ' ' {
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addMatch(id+47*n, l+4, l, matches)
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}
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}
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} else if s[1] == 'f' {
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if s[2] == 'o' {
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if s[3] == 'r' && s[4] == ' ' {
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addMatch(id+25*n, l+5, l, matches)
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}
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} else if s[2] == 'r' {
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if s[3] == 'o' && s[4] == 'm' && s[5] == ' ' {
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addMatch(id+37*n, l+6, l, matches)
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}
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}
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} else if s[1] == 'o' {
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if s[2] == 'f' {
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if s[3] == ' ' {
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addMatch(id+8*n, l+4, l, matches)
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}
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} else if s[2] == 'n' {
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if s[3] == ' ' {
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addMatch(id+45*n, l+4, l, matches)
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}
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}
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} else if s[1] == 'n' {
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if s[2] == 'o' && s[3] == 't' && s[4] == ' ' {
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addMatch(id+80*n, l+5, l, matches)
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}
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} else if s[1] == 't' {
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if s[2] == 'h' {
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if s[3] == 'e' {
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if s[4] == ' ' {
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addMatch(id+5*n, l+5, l, matches)
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}
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} else if s[3] == 'a' {
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if s[4] == 't' && s[5] == ' ' {
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addMatch(id+29*n, l+6, l, matches)
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}
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}
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} else if s[2] == 'o' {
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if s[3] == ' ' {
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addMatch(id+17*n, l+4, l, matches)
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}
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}
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} else if s[1] == 'w' {
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if s[2] == 'i' && s[3] == 't' && s[4] == 'h' && s[5] == ' ' {
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addMatch(id+35*n, l+6, l, matches)
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}
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}
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} else if s[0] == '"' {
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addMatch(id+19*n, l+1, l, matches)
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if s[1] == '>' {
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addMatch(id+21*n, l+2, l, matches)
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}
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} else if s[0] == '.' {
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addMatch(id+20*n, l+1, l, matches)
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if s[1] == ' ' {
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addMatch(id+31*n, l+2, l, matches)
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if s[2] == 'T' && s[3] == 'h' {
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if s[4] == 'e' {
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if s[5] == ' ' {
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addMatch(id+43*n, l+6, l, matches)
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}
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} else if s[4] == 'i' {
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if s[5] == 's' && s[6] == ' ' {
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addMatch(id+75*n, l+7, l, matches)
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}
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}
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}
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}
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} else if s[0] == ',' {
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addMatch(id+76*n, l+1, l, matches)
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if s[1] == ' ' {
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addMatch(id+14*n, l+2, l, matches)
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}
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} else if s[0] == '\n' {
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addMatch(id+22*n, l+1, l, matches)
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if s[1] == '\t' {
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addMatch(id+50*n, l+2, l, matches)
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}
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} else if s[0] == ']' {
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addMatch(id+24*n, l+1, l, matches)
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} else if s[0] == '\'' {
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addMatch(id+36*n, l+1, l, matches)
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} else if s[0] == ':' {
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addMatch(id+51*n, l+1, l, matches)
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} else if s[0] == '(' {
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addMatch(id+57*n, l+1, l, matches)
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} else if s[0] == '=' {
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if s[1] == '"' {
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addMatch(id+70*n, l+2, l, matches)
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} else if s[1] == '\'' {
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addMatch(id+86*n, l+2, l, matches)
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}
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} else if s[0] == 'a' {
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if s[1] == 'l' && s[2] == ' ' {
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addMatch(id+84*n, l+3, l, matches)
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}
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} else if s[0] == 'e' {
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if s[1] == 'd' {
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if s[2] == ' ' {
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addMatch(id+53*n, l+3, l, matches)
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}
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} else if s[1] == 'r' {
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if s[2] == ' ' {
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addMatch(id+82*n, l+3, l, matches)
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}
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} else if s[1] == 's' {
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if s[2] == 't' && s[3] == ' ' {
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addMatch(id+95*n, l+4, l, matches)
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}
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}
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} else if s[0] == 'f' {
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if s[1] == 'u' && s[2] == 'l' && s[3] == ' ' {
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addMatch(id+90*n, l+4, l, matches)
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}
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} else if s[0] == 'i' {
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if s[1] == 'v' {
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if s[2] == 'e' && s[3] == ' ' {
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addMatch(id+92*n, l+4, l, matches)
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}
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} else if s[1] == 'z' {
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if s[2] == 'e' && s[3] == ' ' {
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addMatch(id+100*n, l+4, l, matches)
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}
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}
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} else if s[0] == 'l' {
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if s[1] == 'e' {
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if s[2] == 's' && s[3] == 's' && s[4] == ' ' {
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addMatch(id+93*n, l+5, l, matches)
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}
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} else if s[1] == 'y' {
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if s[2] == ' ' {
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addMatch(id+61*n, l+3, l, matches)
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}
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}
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} else if s[0] == 'o' {
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if s[1] == 'u' && s[2] == 's' && s[3] == ' ' {
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addMatch(id+106*n, l+4, l, matches)
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}
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}
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} else {
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var is_all_caps bool = (w.transform != transformUppercaseFirst)
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/* Set is_all_caps=0 for BROTLI_TRANSFORM_UPPERCASE_FIRST and
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is_all_caps=1 otherwise (BROTLI_TRANSFORM_UPPERCASE_ALL)
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transform. */
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var s []byte
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if !isMatch(dict.words, w, data, max_length) {
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continue
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}
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/* Transform "" + kUppercase{First,All} + "" */
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var tmp int
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if is_all_caps {
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tmp = 44
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} else {
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tmp = 9
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}
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addMatch(id+uint(tmp)*n, l, l, matches)
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has_found_match = true
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if l+1 >= max_length {
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continue
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}
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/* Transforms "" + kUppercase{First,All} + <suffix> */
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s = data[l:]
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if s[0] == ' ' {
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var tmp int
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if is_all_caps {
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tmp = 68
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} else {
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tmp = 4
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}
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addMatch(id+uint(tmp)*n, l+1, l, matches)
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} else if s[0] == '"' {
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var tmp int
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if is_all_caps {
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tmp = 87
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} else {
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tmp = 66
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}
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addMatch(id+uint(tmp)*n, l+1, l, matches)
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if s[1] == '>' {
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var tmp int
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if is_all_caps {
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tmp = 97
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} else {
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tmp = 69
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}
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addMatch(id+uint(tmp)*n, l+2, l, matches)
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}
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} else if s[0] == '.' {
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var tmp int
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if is_all_caps {
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tmp = 101
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} else {
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tmp = 79
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}
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addMatch(id+uint(tmp)*n, l+1, l, matches)
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if s[1] == ' ' {
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var tmp int
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if is_all_caps {
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tmp = 114
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} else {
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tmp = 88
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}
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addMatch(id+uint(tmp)*n, l+2, l, matches)
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}
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} else if s[0] == ',' {
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var tmp int
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if is_all_caps {
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tmp = 112
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} else {
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tmp = 99
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}
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addMatch(id+uint(tmp)*n, l+1, l, matches)
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if s[1] == ' ' {
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var tmp int
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if is_all_caps {
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tmp = 107
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} else {
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tmp = 58
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}
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addMatch(id+uint(tmp)*n, l+2, l, matches)
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}
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} else if s[0] == '\'' {
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var tmp int
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if is_all_caps {
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tmp = 94
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} else {
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tmp = 74
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}
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addMatch(id+uint(tmp)*n, l+1, l, matches)
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} else if s[0] == '(' {
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var tmp int
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if is_all_caps {
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tmp = 113
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} else {
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tmp = 78
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}
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addMatch(id+uint(tmp)*n, l+1, l, matches)
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} else if s[0] == '=' {
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if s[1] == '"' {
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var tmp int
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if is_all_caps {
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tmp = 105
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} else {
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tmp = 104
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}
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addMatch(id+uint(tmp)*n, l+2, l, matches)
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} else if s[1] == '\'' {
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var tmp int
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if is_all_caps {
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tmp = 116
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} else {
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tmp = 108
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}
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addMatch(id+uint(tmp)*n, l+2, l, matches)
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}
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}
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}
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}
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}
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/* Transforms with prefixes " " and "." */
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if max_length >= 5 && (data[0] == ' ' || data[0] == '.') {
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var is_space bool = (data[0] == ' ')
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var offset uint = uint(dict.buckets[hash(data[1:])])
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var end bool = offset == 0
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for !end {
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w := dict.dict_words[offset]
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offset++
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var l uint = uint(w.len) & 0x1F
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var n uint = uint(1) << dict.words.size_bits_by_length[l]
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var id uint = uint(w.idx)
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end = !(w.len&0x80 == 0)
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w.len = byte(l)
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if w.transform == 0 {
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var s []byte
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if !isMatch(dict.words, w, data[1:], max_length-1) {
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continue
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}
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/* Transforms " " + BROTLI_TRANSFORM_IDENTITY + "" and
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"." + BROTLI_TRANSFORM_IDENTITY + "" */
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var tmp int
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if is_space {
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tmp = 6
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} else {
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tmp = 32
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}
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addMatch(id+uint(tmp)*n, l+1, l, matches)
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has_found_match = true
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if l+2 >= max_length {
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continue
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}
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/* Transforms " " + BROTLI_TRANSFORM_IDENTITY + <suffix> and
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"." + BROTLI_TRANSFORM_IDENTITY + <suffix>
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*/
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s = data[l+1:]
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if s[0] == ' ' {
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var tmp int
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if is_space {
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tmp = 2
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} else {
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tmp = 77
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}
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addMatch(id+uint(tmp)*n, l+2, l, matches)
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} else if s[0] == '(' {
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var tmp int
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if is_space {
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tmp = 89
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} else {
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tmp = 67
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}
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addMatch(id+uint(tmp)*n, l+2, l, matches)
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} else if is_space {
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if s[0] == ',' {
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addMatch(id+103*n, l+2, l, matches)
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if s[1] == ' ' {
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addMatch(id+33*n, l+3, l, matches)
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}
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} else if s[0] == '.' {
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addMatch(id+71*n, l+2, l, matches)
|
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if s[1] == ' ' {
|
|
addMatch(id+52*n, l+3, l, matches)
|
|
}
|
|
} else if s[0] == '=' {
|
|
if s[1] == '"' {
|
|
addMatch(id+81*n, l+3, l, matches)
|
|
} else if s[1] == '\'' {
|
|
addMatch(id+98*n, l+3, l, matches)
|
|
}
|
|
}
|
|
}
|
|
} else if is_space {
|
|
var is_all_caps bool = (w.transform != transformUppercaseFirst)
|
|
/* Set is_all_caps=0 for BROTLI_TRANSFORM_UPPERCASE_FIRST and
|
|
is_all_caps=1 otherwise (BROTLI_TRANSFORM_UPPERCASE_ALL)
|
|
transform. */
|
|
|
|
var s []byte
|
|
if !isMatch(dict.words, w, data[1:], max_length-1) {
|
|
continue
|
|
}
|
|
|
|
/* Transforms " " + kUppercase{First,All} + "" */
|
|
var tmp int
|
|
if is_all_caps {
|
|
tmp = 85
|
|
} else {
|
|
tmp = 30
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+1, l, matches)
|
|
|
|
has_found_match = true
|
|
if l+2 >= max_length {
|
|
continue
|
|
}
|
|
|
|
/* Transforms " " + kUppercase{First,All} + <suffix> */
|
|
s = data[l+1:]
|
|
|
|
if s[0] == ' ' {
|
|
var tmp int
|
|
if is_all_caps {
|
|
tmp = 83
|
|
} else {
|
|
tmp = 15
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+2, l, matches)
|
|
} else if s[0] == ',' {
|
|
if !is_all_caps {
|
|
addMatch(id+109*n, l+2, l, matches)
|
|
}
|
|
|
|
if s[1] == ' ' {
|
|
var tmp int
|
|
if is_all_caps {
|
|
tmp = 111
|
|
} else {
|
|
tmp = 65
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+3, l, matches)
|
|
}
|
|
} else if s[0] == '.' {
|
|
var tmp int
|
|
if is_all_caps {
|
|
tmp = 115
|
|
} else {
|
|
tmp = 96
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+2, l, matches)
|
|
if s[1] == ' ' {
|
|
var tmp int
|
|
if is_all_caps {
|
|
tmp = 117
|
|
} else {
|
|
tmp = 91
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+3, l, matches)
|
|
}
|
|
} else if s[0] == '=' {
|
|
if s[1] == '"' {
|
|
var tmp int
|
|
if is_all_caps {
|
|
tmp = 110
|
|
} else {
|
|
tmp = 118
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+3, l, matches)
|
|
} else if s[1] == '\'' {
|
|
var tmp int
|
|
if is_all_caps {
|
|
tmp = 119
|
|
} else {
|
|
tmp = 120
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+3, l, matches)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if max_length >= 6 {
|
|
/* Transforms with prefixes "e ", "s ", ", " and "\xC2\xA0" */
|
|
if (data[1] == ' ' && (data[0] == 'e' || data[0] == 's' || data[0] == ',')) || (data[0] == 0xC2 && data[1] == 0xA0) {
|
|
var offset uint = uint(dict.buckets[hash(data[2:])])
|
|
var end bool = offset == 0
|
|
for !end {
|
|
w := dict.dict_words[offset]
|
|
offset++
|
|
var l uint = uint(w.len) & 0x1F
|
|
var n uint = uint(1) << dict.words.size_bits_by_length[l]
|
|
var id uint = uint(w.idx)
|
|
end = !(w.len&0x80 == 0)
|
|
w.len = byte(l)
|
|
if w.transform == 0 && isMatch(dict.words, w, data[2:], max_length-2) {
|
|
if data[0] == 0xC2 {
|
|
addMatch(id+102*n, l+2, l, matches)
|
|
has_found_match = true
|
|
} else if l+2 < max_length && data[l+2] == ' ' {
|
|
var t uint = 13
|
|
if data[0] == 'e' {
|
|
t = 18
|
|
} else if data[0] == 's' {
|
|
t = 7
|
|
}
|
|
addMatch(id+t*n, l+3, l, matches)
|
|
has_found_match = true
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if max_length >= 9 {
|
|
/* Transforms with prefixes " the " and ".com/" */
|
|
if (data[0] == ' ' && data[1] == 't' && data[2] == 'h' && data[3] == 'e' && data[4] == ' ') || (data[0] == '.' && data[1] == 'c' && data[2] == 'o' && data[3] == 'm' && data[4] == '/') {
|
|
var offset uint = uint(dict.buckets[hash(data[5:])])
|
|
var end bool = offset == 0
|
|
for !end {
|
|
w := dict.dict_words[offset]
|
|
offset++
|
|
var l uint = uint(w.len) & 0x1F
|
|
var n uint = uint(1) << dict.words.size_bits_by_length[l]
|
|
var id uint = uint(w.idx)
|
|
end = !(w.len&0x80 == 0)
|
|
w.len = byte(l)
|
|
if w.transform == 0 && isMatch(dict.words, w, data[5:], max_length-5) {
|
|
var tmp int
|
|
if data[0] == ' ' {
|
|
tmp = 41
|
|
} else {
|
|
tmp = 72
|
|
}
|
|
addMatch(id+uint(tmp)*n, l+5, l, matches)
|
|
has_found_match = true
|
|
if l+5 < max_length {
|
|
var s []byte = data[l+5:]
|
|
if data[0] == ' ' {
|
|
if l+8 < max_length && s[0] == ' ' && s[1] == 'o' && s[2] == 'f' && s[3] == ' ' {
|
|
addMatch(id+62*n, l+9, l, matches)
|
|
if l+12 < max_length && s[4] == 't' && s[5] == 'h' && s[6] == 'e' && s[7] == ' ' {
|
|
addMatch(id+73*n, l+13, l, matches)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return has_found_match
|
|
}
|