The Tor Browser: browser/components/translation/cld2/internal/utf8statetable.h@6474c204b198 (annotated)

browser/components/translation/cld2/internal/utf8statetable.h@6474c204b198 (annotated)

browser/components/translation/cld2/internal/utf8statetable.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright 2013 Google Inc. All Rights Reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
 // State Table follower for scanning UTF-8 strings without converting to
 // 32- or 16-bit Unicode values.
 //
 // Author: dsites@google.com (Dick Sites)
 //
 #ifndef UTIL_UTF8_UTF8STATETABLE_H_
 #define UTIL_UTF8_UTF8STATETABLE_H_
 #include <string>
 #include "integral_types.h"             // for uint8, uint32, uint16
 #include "stringpiece.h"
 namespace CLD2 {
 class OffsetMap;
 // These four-byte entries compactly encode how many bytes 0..255 to delete
 // in making a string replacement, how many bytes to add 0..255, and the offset
 // 0..64k-1 of the replacement string in remap_string.
 struct RemapEntry {
   uint8 delete_bytes;
   uint8 add_bytes;
   uint16 bytes_offset;
 };
 // Exit type codes for state tables. All but the first get stuffed into
 // signed one-byte entries. The first is only generated by executable code.
 // To distinguish from next-state entries, these must be contiguous and
 // all <= kExitNone
 typedef enum {
   kExitDstSpaceFull = 239,
   kExitIllegalStructure,  // 240
   kExitOK,                // 241
   kExitReject,            // ...
   kExitReplace1,
   kExitReplace2,
   kExitReplace3,
   kExitReplace21,
   kExitReplace31,
   kExitReplace32,
   kExitReplaceOffset1,
   kExitReplaceOffset2,
   kExitReplace1S0,
   kExitSpecial,
   kExitDoAgain,
   kExitRejectAlt,
   kExitNone               // 255
 } ExitReason;
 typedef enum {
   kExitDstSpaceFull_2 = 32767,       // 0x7fff
   kExitIllegalStructure_2,  // 32768    0x8000
   kExitOK_2,                // 32769    0x8001
   kExitReject_2,            // ...
   kExitReplace1_2,
   kExitReplace2_2,
   kExitReplace3_2,
   kExitReplace21_2,
   kExitReplace31_2,
   kExitReplace32_2,
   kExitReplaceOffset1_2,
   kExitReplaceOffset2_2,
   kExitReplace1S0_2,
   kExitSpecial_2,
   kExitDoAgain_2,
   kExitRejectAlt_2,
   kExitNone_2               // 32783    0x800f
 } ExitReason_2;
 // This struct represents one entire state table. The three initialized byte
 // areas are state_table, remap_base, and remap_string. state0 and state0_size
 // give the byte offset and length within state_table of the initial state --
 // table lookups are expected to start and end in this state, but for
 // truncated UTF-8 strings, may end in a different state. These allow a quick
 // test for that condition. entry_shift is 8 for tables subscripted by a full
 // byte value and 6 for space-optimized tables subscripted by only six
 // significant bits in UTF-8 continuation bytes.
 typedef struct {
   const uint32 state0;
   const uint32 state0_size;
   const uint32 total_size;
   const int max_expand;
   const int entry_shift;
   const int bytes_per_entry;
   const uint32 losub;
   const uint32 hiadd;
   const uint8* state_table;
   const RemapEntry* remap_base;
   const uint8* remap_string;
   const uint8* fast_state;
 } UTF8StateMachineObj;
 // Near-duplicate declaration for tables with two-byte entries
 typedef struct {
   const uint32 state0;
   const uint32 state0_size;
   const uint32 total_size;
   const int max_expand;
   const int entry_shift;
   const int bytes_per_entry;
   const uint32 losub;
   const uint32 hiadd;
   const unsigned short* state_table;
   const RemapEntry* remap_base;
   const uint8* remap_string;
   const uint8* fast_state;
 } UTF8StateMachineObj_2;
 typedef UTF8StateMachineObj UTF8PropObj;
 typedef UTF8StateMachineObj UTF8ScanObj;
 typedef UTF8StateMachineObj UTF8ReplaceObj;
 typedef UTF8StateMachineObj_2 UTF8PropObj_2;
 typedef UTF8StateMachineObj_2 UTF8ReplaceObj_2;
 // NOT IMPLEMENTED typedef UTF8StateMachineObj_2 UTF8ScanObj_2;
 // Look up property of one UTF-8 character and advance over it
 // Return 0 if input length is zero
 // Return 0 and advance one byte if input is ill-formed
 uint8 UTF8GenericProperty(const UTF8PropObj* st,
                           const uint8** src,
                           int* srclen);
 // Look up property of one UTF-8 character (assumed to be valid).
 // (This is a faster version of UTF8GenericProperty.)
 bool UTF8HasGenericProperty(const UTF8PropObj& st, const char* src);
 // BigOneByte versions are needed for tables > 240 states, but most
 // won't need the TwoByte versions.
 // Look up property of one UTF-8 character and advance over it
 // Return 0 if input length is zero
 // Return 0 and advance one byte if input is ill-formed
 uint8 UTF8GenericPropertyBigOneByte(const UTF8PropObj* st,
                           const uint8** src,
                           int* srclen);
 // TwoByte versions are needed for tables > 240 states that don't fit onto
 // BigOneByte -- rare ultimate fallback
 // Look up property of one UTF-8 character (assumed to be valid).
 // (This is a faster version of UTF8GenericProperty.)
 bool UTF8HasGenericPropertyBigOneByte(const UTF8PropObj& st, const char* src);
 // Look up property of one UTF-8 character and advance over it
 // Return 0 if input length is zero
 // Return 0 and advance one byte if input is ill-formed
 uint8 UTF8GenericPropertyTwoByte(const UTF8PropObj_2* st,
                           const uint8** src,
                           int* srclen);
 // Look up property of one UTF-8 character (assumed to be valid).
 // (This is a faster version of UTF8GenericProperty.)
 bool UTF8HasGenericPropertyTwoByte(const UTF8PropObj_2& st, const char* src);
 // Scan a UTF-8 stringpiece based on a state table.
 // Always scan complete UTF-8 characters
 // Set number of bytes scanned. Return reason for exiting
 int UTF8GenericScan(const UTF8ScanObj* st,
                     const StringPiece& str,
                     int* bytes_consumed);
 // Scan a UTF-8 stringpiece based on state table, copying to output stringpiece
 //   and doing text replacements.
 // Always scan complete UTF-8 characters
 // Set number of bytes consumed from input, number filled to output.
 // Return reason for exiting
 // Also writes an optional OffsetMap. Pass NULL to skip writing one.
 int UTF8GenericReplace(const UTF8ReplaceObj* st,
                     const StringPiece& istr,
                     StringPiece& ostr,
                     bool is_plain_text,
                     int* bytes_consumed,
                     int* bytes_filled,
                     int* chars_changed,
                     OffsetMap* offsetmap);
 // Older version without offsetmap
 int UTF8GenericReplace(const UTF8ReplaceObj* st,
                     const StringPiece& istr,
                     StringPiece& ostr,
                     bool is_plain_text,
                     int* bytes_consumed,
                     int* bytes_filled,
                     int* chars_changed);
 // Older version without is_plain_text or offsetmap
 int UTF8GenericReplace(const UTF8ReplaceObj* st,
                     const StringPiece& istr,
                     StringPiece& ostr,
                     int* bytes_consumed,
                     int* bytes_filled,
                     int* chars_changed);
 // TwoByte version is needed for tables > about 256 states, such
 // as the table for full Unicode 4.1 canonical + compatibility mapping
 // Scan a UTF-8 stringpiece based on state table with two-byte entries,
 //   copying to output stringpiece
 //   and doing text replacements.
 // Always scan complete UTF-8 characters
 // Set number of bytes consumed from input, number filled to output.
 // Return reason for exiting
 // Also writes an optional OffsetMap. Pass NULL to skip writing one.
 int UTF8GenericReplaceTwoByte(const UTF8ReplaceObj_2* st,
                     const StringPiece& istr,
                     StringPiece& ostr,
                     bool is_plain_text,
                     int* bytes_consumed,
                     int* bytes_filled,
                     int* chars_changed,
                     OffsetMap* offsetmap);
 // Older version without offsetmap
 int UTF8GenericReplaceTwoByte(const UTF8ReplaceObj_2* st,
                     const StringPiece& istr,
                     StringPiece& ostr,
                     bool is_plain_text,
                     int* bytes_consumed,
                     int* bytes_filled,
                     int* chars_changed);
 // Older version without is_plain_text or offsetmap
 int UTF8GenericReplaceTwoByte(const UTF8ReplaceObj_2* st,
                     const StringPiece& istr,
                     StringPiece& ostr,
                     int* bytes_consumed,
                     int* bytes_filled,
                     int* chars_changed);
 static const unsigned char kUTF8LenTbl[256] = {
 ,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
 ,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
 ,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
 ,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
 ,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
 ,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,
 ,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,
 ,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3, 4,4,4,4,4,4,4,4, 4,4,4,4,4,4,4,4
 };
 inline int UTF8OneCharLen(const char* in) {
   return kUTF8LenTbl[*reinterpret_cast<const uint8*>(in)];
 }
 // Adjust a stringpiece to encompass complete UTF-8 characters.
 // The data pointer will be increased by 0..3 bytes to get to a character
 // boundary, and the length will then be decreased by 0..3 bytes
 // to encompass the last complete character.
 // This is useful especially when a UTF-8 string must be put into a fixed-
 // maximum-size buffer cleanly, such as a MySQL buffer.
 void UTF8TrimToChars(StringPiece* istr);
 }       // End namespace CLD2
 #endif  // UTIL_UTF8_UTF8STATETABLE_H_

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browser/components/translation/cld2/internal/utf8statetable.h@6474c204b198 (annotated)

browser/components/translation/cld2/internal/utf8statetable.h