mirror of
https://github.com/google/brotli.git
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301 lines
9.3 KiB
C
301 lines
9.3 KiB
C
/* 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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/* Transformations on dictionary words. */
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#ifndef BROTLI_DEC_TRANSFORM_H_
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#define BROTLI_DEC_TRANSFORM_H_
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#include <brotli/types.h>
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#include "./port.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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enum WordTransformType {
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kIdentity = 0,
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kOmitLast1 = 1,
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kOmitLast2 = 2,
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kOmitLast3 = 3,
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kOmitLast4 = 4,
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kOmitLast5 = 5,
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kOmitLast6 = 6,
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kOmitLast7 = 7,
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kOmitLast8 = 8,
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kOmitLast9 = 9,
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kUppercaseFirst = 10,
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kUppercaseAll = 11,
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kOmitFirst1 = 12,
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kOmitFirst2 = 13,
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kOmitFirst3 = 14,
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kOmitFirst4 = 15,
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kOmitFirst5 = 16,
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kOmitFirst6 = 17,
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kOmitFirst7 = 18,
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kOmitFirst8 = 19,
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kOmitFirst9 = 20
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};
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typedef struct {
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const uint8_t prefix_id;
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const uint8_t transform;
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const uint8_t suffix_id;
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} Transform;
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static const char kPrefixSuffix[208] =
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"\0 \0, \0 of the \0 of \0s \0.\0 and \0 in \0\"\0 to \0\">\0\n\0. \0]\0"
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" for \0 a \0 that \0\'\0 with \0 from \0 by \0(\0. The \0 on \0 as \0"
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" is \0ing \0\n\t\0:\0ed \0=\"\0 at \0ly \0,\0=\'\0.com/\0. This \0"
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" not \0er \0al \0ful \0ive \0less \0est \0ize \0\xc2\xa0\0ous ";
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enum {
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/* EMPTY = ""
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SP = " "
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DQUOT = "\""
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SQUOT = "'"
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CLOSEBR = "]"
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OPEN = "("
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SLASH = "/"
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NBSP = non-breaking space "\0xc2\xa0"
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*/
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kPFix_EMPTY = 0,
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kPFix_SP = 1,
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kPFix_COMMASP = 3,
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kPFix_SPofSPtheSP = 6,
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kPFix_SPtheSP = 9,
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kPFix_eSP = 12,
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kPFix_SPofSP = 15,
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kPFix_sSP = 20,
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kPFix_DOT = 23,
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kPFix_SPandSP = 25,
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kPFix_SPinSP = 31,
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kPFix_DQUOT = 36,
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kPFix_SPtoSP = 38,
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kPFix_DQUOTGT = 43,
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kPFix_NEWLINE = 46,
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kPFix_DOTSP = 48,
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kPFix_CLOSEBR = 51,
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kPFix_SPforSP = 53,
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kPFix_SPaSP = 59,
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kPFix_SPthatSP = 63,
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kPFix_SQUOT = 70,
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kPFix_SPwithSP = 72,
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kPFix_SPfromSP = 79,
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kPFix_SPbySP = 86,
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kPFix_OPEN = 91,
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kPFix_DOTSPTheSP = 93,
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kPFix_SPonSP = 100,
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kPFix_SPasSP = 105,
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kPFix_SPisSP = 110,
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kPFix_ingSP = 115,
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kPFix_NEWLINETAB = 120,
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kPFix_COLON = 123,
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kPFix_edSP = 125,
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kPFix_EQDQUOT = 129,
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kPFix_SPatSP = 132,
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kPFix_lySP = 137,
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kPFix_COMMA = 141,
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kPFix_EQSQUOT = 143,
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kPFix_DOTcomSLASH = 146,
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kPFix_DOTSPThisSP = 152,
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kPFix_SPnotSP = 160,
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kPFix_erSP = 166,
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kPFix_alSP = 170,
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kPFix_fulSP = 174,
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kPFix_iveSP = 179,
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kPFix_lessSP = 184,
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kPFix_estSP = 190,
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kPFix_izeSP = 195,
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kPFix_NBSP = 200,
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kPFix_ousSP = 203
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};
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static const Transform kTransforms[] = {
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{ kPFix_EMPTY, kIdentity, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_SP },
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{ kPFix_SP, kIdentity, kPFix_SP },
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{ kPFix_EMPTY, kOmitFirst1, kPFix_EMPTY },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_SP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPtheSP },
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{ kPFix_SP, kIdentity, kPFix_EMPTY },
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{ kPFix_sSP, kIdentity, kPFix_SP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPofSP },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_SPandSP },
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{ kPFix_EMPTY, kOmitFirst2, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitLast1, kPFix_EMPTY },
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{ kPFix_COMMASP, kIdentity, kPFix_SP },
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{ kPFix_EMPTY, kIdentity, kPFix_COMMASP },
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{ kPFix_SP, kUppercaseFirst, kPFix_SP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPinSP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPtoSP },
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{ kPFix_eSP, kIdentity, kPFix_SP },
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{ kPFix_EMPTY, kIdentity, kPFix_DQUOT },
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{ kPFix_EMPTY, kIdentity, kPFix_DOT },
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{ kPFix_EMPTY, kIdentity, kPFix_DQUOTGT },
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{ kPFix_EMPTY, kIdentity, kPFix_NEWLINE },
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{ kPFix_EMPTY, kOmitLast3, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_CLOSEBR },
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{ kPFix_EMPTY, kIdentity, kPFix_SPforSP },
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{ kPFix_EMPTY, kOmitFirst3, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitLast2, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_SPaSP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPthatSP },
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{ kPFix_SP, kUppercaseFirst, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_DOTSP },
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{ kPFix_DOT, kIdentity, kPFix_EMPTY },
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{ kPFix_SP, kIdentity, kPFix_COMMASP },
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{ kPFix_EMPTY, kOmitFirst4, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_SPwithSP },
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{ kPFix_EMPTY, kIdentity, kPFix_SQUOT },
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{ kPFix_EMPTY, kIdentity, kPFix_SPfromSP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPbySP },
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{ kPFix_EMPTY, kOmitFirst5, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitFirst6, kPFix_EMPTY },
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{ kPFix_SPtheSP, kIdentity, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitLast4, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_DOTSPTheSP },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_SPonSP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPasSP },
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{ kPFix_EMPTY, kIdentity, kPFix_SPisSP },
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{ kPFix_EMPTY, kOmitLast7, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitLast1, kPFix_ingSP },
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{ kPFix_EMPTY, kIdentity, kPFix_NEWLINETAB },
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{ kPFix_EMPTY, kIdentity, kPFix_COLON },
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{ kPFix_SP, kIdentity, kPFix_DOTSP },
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{ kPFix_EMPTY, kIdentity, kPFix_edSP },
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{ kPFix_EMPTY, kOmitFirst9, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitFirst7, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitLast6, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_OPEN },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_COMMASP },
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{ kPFix_EMPTY, kOmitLast8, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_SPatSP },
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{ kPFix_EMPTY, kIdentity, kPFix_lySP },
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{ kPFix_SPtheSP, kIdentity, kPFix_SPofSP },
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{ kPFix_EMPTY, kOmitLast5, kPFix_EMPTY },
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{ kPFix_EMPTY, kOmitLast9, kPFix_EMPTY },
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{ kPFix_SP, kUppercaseFirst, kPFix_COMMASP },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_DQUOT },
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{ kPFix_DOT, kIdentity, kPFix_OPEN },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_SP },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_DQUOTGT },
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{ kPFix_EMPTY, kIdentity, kPFix_EQDQUOT },
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{ kPFix_SP, kIdentity, kPFix_DOT },
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{ kPFix_DOTcomSLASH, kIdentity, kPFix_EMPTY },
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{ kPFix_SPtheSP, kIdentity, kPFix_SPofSPtheSP },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_SQUOT },
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{ kPFix_EMPTY, kIdentity, kPFix_DOTSPThisSP },
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{ kPFix_EMPTY, kIdentity, kPFix_COMMA },
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{ kPFix_DOT, kIdentity, kPFix_SP },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_OPEN },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_DOT },
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{ kPFix_EMPTY, kIdentity, kPFix_SPnotSP },
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{ kPFix_SP, kIdentity, kPFix_EQDQUOT },
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{ kPFix_EMPTY, kIdentity, kPFix_erSP },
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{ kPFix_SP, kUppercaseAll, kPFix_SP },
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{ kPFix_EMPTY, kIdentity, kPFix_alSP },
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{ kPFix_SP, kUppercaseAll, kPFix_EMPTY },
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{ kPFix_EMPTY, kIdentity, kPFix_EQSQUOT },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_DQUOT },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_DOTSP },
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{ kPFix_SP, kIdentity, kPFix_OPEN },
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{ kPFix_EMPTY, kIdentity, kPFix_fulSP },
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{ kPFix_SP, kUppercaseFirst, kPFix_DOTSP },
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{ kPFix_EMPTY, kIdentity, kPFix_iveSP },
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{ kPFix_EMPTY, kIdentity, kPFix_lessSP },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_SQUOT },
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{ kPFix_EMPTY, kIdentity, kPFix_estSP },
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{ kPFix_SP, kUppercaseFirst, kPFix_DOT },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_DQUOTGT },
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{ kPFix_SP, kIdentity, kPFix_EQSQUOT },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_COMMA },
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{ kPFix_EMPTY, kIdentity, kPFix_izeSP },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_DOT },
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{ kPFix_NBSP, kIdentity, kPFix_EMPTY },
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{ kPFix_SP, kIdentity, kPFix_COMMA },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_EQDQUOT },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_EQDQUOT },
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{ kPFix_EMPTY, kIdentity, kPFix_ousSP },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_COMMASP },
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{ kPFix_EMPTY, kUppercaseFirst, kPFix_EQSQUOT },
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{ kPFix_SP, kUppercaseFirst, kPFix_COMMA },
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{ kPFix_SP, kUppercaseAll, kPFix_EQDQUOT },
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{ kPFix_SP, kUppercaseAll, kPFix_COMMASP },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_COMMA },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_OPEN },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_DOTSP },
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{ kPFix_SP, kUppercaseAll, kPFix_DOT },
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{ kPFix_EMPTY, kUppercaseAll, kPFix_EQSQUOT },
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{ kPFix_SP, kUppercaseAll, kPFix_DOTSP },
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{ kPFix_SP, kUppercaseFirst, kPFix_EQDQUOT },
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{ kPFix_SP, kUppercaseAll, kPFix_EQSQUOT },
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{ kPFix_SP, kUppercaseFirst, kPFix_EQSQUOT },
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};
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static const int kNumTransforms = sizeof(kTransforms) / sizeof(kTransforms[0]);
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static int ToUpperCase(uint8_t* p) {
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if (p[0] < 0xc0) {
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if (p[0] >= 'a' && p[0] <= 'z') {
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p[0] ^= 32;
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}
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return 1;
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}
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/* An overly simplified uppercasing model for UTF-8. */
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if (p[0] < 0xe0) {
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p[1] ^= 32;
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return 2;
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}
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/* An arbitrary transform for three byte characters. */
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p[2] ^= 5;
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return 3;
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}
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static BROTLI_NOINLINE int TransformDictionaryWord(
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uint8_t* dst, const uint8_t* word, int len, int transform) {
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int idx = 0;
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{
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const char* prefix = &kPrefixSuffix[kTransforms[transform].prefix_id];
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while (*prefix) { dst[idx++] = (uint8_t)*prefix++; }
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}
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{
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const int t = kTransforms[transform].transform;
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int i = 0;
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int skip = t - (kOmitFirst1 - 1);
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if (skip > 0) {
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word += skip;
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len -= skip;
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} else if (t <= kOmitLast9) {
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len -= t;
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}
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while (i < len) { dst[idx++] = word[i++]; }
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if (t == kUppercaseFirst) {
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ToUpperCase(&dst[idx - len]);
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} else if (t == kUppercaseAll) {
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uint8_t* uppercase = &dst[idx - len];
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while (len > 0) {
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int step = ToUpperCase(uppercase);
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uppercase += step;
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len -= step;
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}
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}
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}
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{
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const char* suffix = &kPrefixSuffix[kTransforms[transform].suffix_id];
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while (*suffix) { dst[idx++] = (uint8_t)*suffix++; }
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return idx;
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}
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}
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#if defined(__cplusplus) || defined(c_plusplus)
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} /* extern "C" */
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#endif
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#endif /* BROTLI_DEC_TRANSFORM_H_ */
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