| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| package com.android.inputmethod.latin.makedict; |
| |
| import com.android.inputmethod.latin.Constants; |
| import com.android.inputmethod.latin.makedict.FusionDictionary.DictionaryOptions; |
| |
| /** |
| * Dictionary File Format Specification. |
| */ |
| public final class FormatSpec { |
| |
| /* |
| * Array of Node(FusionDictionary.Node) layout is as follows: |
| * |
| * g | |
| * r | the number of groups, 1 or 2 bytes. |
| * o | 1 byte = bbbbbbbb match |
| * u | case 1xxxxxxx => xxxxxxx << 8 + next byte |
| * p | otherwise => bbbbbbbb |
| * c | |
| * ount |
| * |
| * g | |
| * r | sequence of groups, |
| * o | the layout of each group is described below. |
| * u | |
| * ps |
| * |
| * f | |
| * o | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header) |
| * r | forward link address, 3byte |
| * w | 1 byte = bbbbbbbb match |
| * a | case 1xxxxxxx => -((xxxxxxx << 16) + (next byte << 8) + next byte) |
| * r | otherwise => (xxxxxxx << 16) + (next byte << 8) + next byte |
| * d | |
| * linkaddress |
| */ |
| |
| /* Node(CharGroup) layout is as follows: |
| * | IF !SUPPORTS_DYNAMIC_UPDATE |
| * | addressType xx : mask with MASK_GROUP_ADDRESS_TYPE |
| * | 2 bits, 00 = no children : FLAG_GROUP_ADDRESS_TYPE_NOADDRESS |
| * f | 01 = 1 byte : FLAG_GROUP_ADDRESS_TYPE_ONEBYTE |
| * l | 10 = 2 bytes : FLAG_GROUP_ADDRESS_TYPE_TWOBYTES |
| * a | 11 = 3 bytes : FLAG_GROUP_ADDRESS_TYPE_THREEBYTES |
| * g | ELSE |
| * s | is moved ? 2 bits, 11 = no : FLAG_IS_NOT_MOVED |
| * | This must be the same as FLAG_GROUP_ADDRESS_TYPE_THREEBYTES |
| * | 01 = yes : FLAG_IS_MOVED |
| * | the new address is stored in the same place as the parent address |
| * | is deleted? 10 = yes : FLAG_IS_DELETED |
| * | has several chars ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_MULTIPLE_CHARS |
| * | has a terminal ? 1 bit, 1 = yes, 0 = no : FLAG_IS_TERMINAL |
| * | has shortcut targets ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_SHORTCUT_TARGETS |
| * | has bigrams ? 1 bit, 1 = yes, 0 = no : FLAG_HAS_BIGRAMS |
| * | is not a word ? 1 bit, 1 = yes, 0 = no : FLAG_IS_NOT_A_WORD |
| * | is blacklisted ? 1 bit, 1 = yes, 0 = no : FLAG_IS_BLACKLISTED |
| * |
| * p | |
| * a | IF SUPPORTS_DYNAMIC_UPDATE (defined in the file header) |
| * r | parent address, 3byte |
| * e | 1 byte = bbbbbbbb match |
| * n | case 1xxxxxxx => -((0xxxxxxx << 16) + (next byte << 8) + next byte) |
| * t | otherwise => (bbbbbbbb << 16) + (next byte << 8) + next byte |
| * a | |
| * ddress |
| * |
| * c | IF FLAG_HAS_MULTIPLE_CHARS |
| * h | char, char, char, char n * (1 or 3 bytes) : use CharGroupInfo for i/o helpers |
| * a | end 1 byte, = 0 |
| * r | ELSE |
| * s | char 1 or 3 bytes |
| * | END |
| * |
| * f | |
| * r | IF FLAG_IS_TERMINAL |
| * e | frequency 1 byte |
| * q | |
| * |
| * c | IF 00 = FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = addressType |
| * h | // nothing |
| * i | ELSIF 01 = FLAG_GROUP_ADDRESS_TYPE_ONEBYTE == addressType |
| * l | children address, 1 byte |
| * d | ELSIF 10 = FLAG_GROUP_ADDRESS_TYPE_TWOBYTES == addressType |
| * r | children address, 2 bytes |
| * e | ELSE // 11 = FLAG_GROUP_ADDRESS_TYPE_THREEBYTES = addressType |
| * n | children address, 3 bytes |
| * A | END |
| * d |
| * dress |
| * |
| * | IF FLAG_IS_TERMINAL && FLAG_HAS_SHORTCUT_TARGETS |
| * | shortcut string list |
| * | IF FLAG_IS_TERMINAL && FLAG_HAS_BIGRAMS |
| * | bigrams address list |
| * |
| * Char format is: |
| * 1 byte = bbbbbbbb match |
| * case 000xxxxx: xxxxx << 16 + next byte << 8 + next byte |
| * else: if 00011111 (= 0x1F) : this is the terminator. This is a relevant choice because |
| * unicode code points range from 0 to 0x10FFFF, so any 3-byte value starting with |
| * 00011111 would be outside unicode. |
| * else: iso-latin-1 code |
| * This allows for the whole unicode range to be encoded, including chars outside of |
| * the BMP. Also everything in the iso-latin-1 charset is only 1 byte, except control |
| * characters which should never happen anyway (and still work, but take 3 bytes). |
| * |
| * bigram address list is: |
| * <flags> = | hasNext = 1 bit, 1 = yes, 0 = no : FLAG_ATTRIBUTE_HAS_NEXT |
| * | addressSign = 1 bit, : FLAG_ATTRIBUTE_OFFSET_NEGATIVE |
| * | 1 = must take -address, 0 = must take +address |
| * | xx : mask with MASK_ATTRIBUTE_ADDRESS_TYPE |
| * | addressFormat = 2 bits, 00 = unused : FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE |
| * | 01 = 1 byte : FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE |
| * | 10 = 2 bytes : FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES |
| * | 11 = 3 bytes : FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES |
| * | 4 bits : frequency : mask with FLAG_ATTRIBUTE_FREQUENCY |
| * <address> | IF (01 == FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE == addressFormat) |
| * | read 1 byte, add top 4 bits |
| * | ELSIF (10 == FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES == addressFormat) |
| * | read 2 bytes, add top 4 bits |
| * | ELSE // 11 == FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES == addressFormat |
| * | read 3 bytes, add top 4 bits |
| * | END |
| * | if (FLAG_ATTRIBUTE_OFFSET_NEGATIVE) then address = -address |
| * if (FLAG_ATTRIBUTE_HAS_NEXT) goto bigram_and_shortcut_address_list_is |
| * |
| * shortcut string list is: |
| * <byte size> = GROUP_SHORTCUT_LIST_SIZE_SIZE bytes, big-endian: size of the list, in bytes. |
| * <flags> = | hasNext = 1 bit, 1 = yes, 0 = no : FLAG_ATTRIBUTE_HAS_NEXT |
| * | reserved = 3 bits, must be 0 |
| * | 4 bits : frequency : mask with FLAG_ATTRIBUTE_FREQUENCY |
| * <shortcut> = | string of characters at the char format described above, with the terminator |
| * | used to signal the end of the string. |
| * if (FLAG_ATTRIBUTE_HAS_NEXT goto flags |
| */ |
| |
| static final int VERSION_1_MAGIC_NUMBER = 0x78B1; |
| public static final int VERSION_2_MAGIC_NUMBER = 0x9BC13AFE; |
| static final int MINIMUM_SUPPORTED_VERSION = 1; |
| static final int MAXIMUM_SUPPORTED_VERSION = 3; |
| static final int NOT_A_VERSION_NUMBER = -1; |
| static final int FIRST_VERSION_WITH_HEADER_SIZE = 2; |
| static final int FIRST_VERSION_WITH_DYNAMIC_UPDATE = 3; |
| |
| // These options need to be the same numeric values as the one in the native reading code. |
| static final int GERMAN_UMLAUT_PROCESSING_FLAG = 0x1; |
| // TODO: Make the native reading code read this variable. |
| static final int SUPPORTS_DYNAMIC_UPDATE = 0x2; |
| static final int FRENCH_LIGATURE_PROCESSING_FLAG = 0x4; |
| static final int CONTAINS_BIGRAMS_FLAG = 0x8; |
| |
| // TODO: Make this value adaptative to content data, store it in the header, and |
| // use it in the reading code. |
| static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH; |
| |
| static final int PARENT_ADDRESS_SIZE = 3; |
| static final int FORWARD_LINK_ADDRESS_SIZE = 3; |
| |
| // These flags are used only in the static dictionary. |
| static final int MASK_GROUP_ADDRESS_TYPE = 0xC0; |
| static final int FLAG_GROUP_ADDRESS_TYPE_NOADDRESS = 0x00; |
| static final int FLAG_GROUP_ADDRESS_TYPE_ONEBYTE = 0x40; |
| static final int FLAG_GROUP_ADDRESS_TYPE_TWOBYTES = 0x80; |
| static final int FLAG_GROUP_ADDRESS_TYPE_THREEBYTES = 0xC0; |
| |
| static final int FLAG_HAS_MULTIPLE_CHARS = 0x20; |
| |
| static final int FLAG_IS_TERMINAL = 0x10; |
| static final int FLAG_HAS_SHORTCUT_TARGETS = 0x08; |
| static final int FLAG_HAS_BIGRAMS = 0x04; |
| static final int FLAG_IS_NOT_A_WORD = 0x02; |
| static final int FLAG_IS_BLACKLISTED = 0x01; |
| |
| // These flags are used only in the dynamic dictionary. |
| static final int MASK_MOVE_AND_DELETE_FLAG = 0xC0; |
| static final int FIXED_BIT_OF_DYNAMIC_UPDATE_MOVE = 0x40; |
| static final int FLAG_IS_MOVED = 0x00 | FIXED_BIT_OF_DYNAMIC_UPDATE_MOVE; |
| static final int FLAG_IS_NOT_MOVED = 0x80 | FIXED_BIT_OF_DYNAMIC_UPDATE_MOVE; |
| static final int FLAG_IS_DELETED = 0x80; |
| |
| static final int FLAG_ATTRIBUTE_HAS_NEXT = 0x80; |
| static final int FLAG_ATTRIBUTE_OFFSET_NEGATIVE = 0x40; |
| static final int MASK_ATTRIBUTE_ADDRESS_TYPE = 0x30; |
| static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_ONEBYTE = 0x10; |
| static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_TWOBYTES = 0x20; |
| static final int FLAG_ATTRIBUTE_ADDRESS_TYPE_THREEBYTES = 0x30; |
| static final int FLAG_ATTRIBUTE_FREQUENCY = 0x0F; |
| |
| static final int GROUP_CHARACTERS_TERMINATOR = 0x1F; |
| |
| static final int GROUP_TERMINATOR_SIZE = 1; |
| static final int GROUP_FLAGS_SIZE = 1; |
| static final int GROUP_FREQUENCY_SIZE = 1; |
| static final int GROUP_MAX_ADDRESS_SIZE = 3; |
| static final int GROUP_ATTRIBUTE_FLAGS_SIZE = 1; |
| static final int GROUP_ATTRIBUTE_MAX_ADDRESS_SIZE = 3; |
| static final int GROUP_SHORTCUT_LIST_SIZE_SIZE = 2; |
| |
| static final int NO_CHILDREN_ADDRESS = Integer.MIN_VALUE; |
| static final int NO_PARENT_ADDRESS = 0; |
| static final int NO_FORWARD_LINK_ADDRESS = 0; |
| static final int INVALID_CHARACTER = -1; |
| |
| static final int MAX_CHARGROUPS_FOR_ONE_BYTE_CHARGROUP_COUNT = 0x7F; // 127 |
| static final int MAX_CHARGROUPS_IN_A_NODE = 0x7FFF; // 32767 |
| static final int MAX_BIGRAMS_IN_A_GROUP = 10000; |
| |
| static final int MAX_TERMINAL_FREQUENCY = 255; |
| static final int MAX_BIGRAM_FREQUENCY = 15; |
| |
| public static final int SHORTCUT_WHITELIST_FREQUENCY = 15; |
| |
| // This option needs to be the same numeric value as the one in binary_format.h. |
| static final int NOT_VALID_WORD = -99; |
| static final int SIGNED_CHILDREN_ADDRESS_SIZE = 3; |
| |
| /** |
| * Options about file format. |
| */ |
| public static final class FormatOptions { |
| public final int mVersion; |
| public final boolean mSupportsDynamicUpdate; |
| public FormatOptions(final int version) { |
| this(version, false); |
| } |
| public FormatOptions(final int version, final boolean supportsDynamicUpdate) { |
| mVersion = version; |
| if (version < FIRST_VERSION_WITH_DYNAMIC_UPDATE && supportsDynamicUpdate) { |
| throw new RuntimeException("Dynamic updates are only supported with versions " |
| + FIRST_VERSION_WITH_DYNAMIC_UPDATE + " and ulterior."); |
| } |
| mSupportsDynamicUpdate = supportsDynamicUpdate; |
| } |
| } |
| |
| /** |
| * Class representing file header. |
| */ |
| public static final class FileHeader { |
| public final int mHeaderSize; |
| public final DictionaryOptions mDictionaryOptions; |
| public final FormatOptions mFormatOptions; |
| private static final String DICTIONARY_VERSION_ATTRIBUTE = "version"; |
| private static final String DICTIONARY_LOCALE_ATTRIBUTE = "locale"; |
| private static final String DICTIONARY_ID_ATTRIBUTE = "dictionary"; |
| private static final String DICTIONARY_DESCRIPTION_ATTRIBUTE = "description"; |
| public FileHeader(final int headerSize, final DictionaryOptions dictionaryOptions, |
| final FormatOptions formatOptions) { |
| mHeaderSize = headerSize; |
| mDictionaryOptions = dictionaryOptions; |
| mFormatOptions = formatOptions; |
| } |
| |
| // Helper method to get the locale as a String |
| public String getLocaleString() { |
| return mDictionaryOptions.mAttributes.get(FileHeader.DICTIONARY_LOCALE_ATTRIBUTE); |
| } |
| |
| // Helper method to get the version String |
| public String getVersion() { |
| return mDictionaryOptions.mAttributes.get(FileHeader.DICTIONARY_VERSION_ATTRIBUTE); |
| } |
| |
| // Helper method to get the dictionary ID as a String |
| public String getId() { |
| return mDictionaryOptions.mAttributes.get(FileHeader.DICTIONARY_ID_ATTRIBUTE); |
| } |
| |
| // Helper method to get the description |
| public String getDescription() { |
| // TODO: Right now each dictionary file comes with a description in its own language. |
| // It will display as is no matter the device's locale. It should be internationalized. |
| return mDictionaryOptions.mAttributes.get(FileHeader.DICTIONARY_DESCRIPTION_ATTRIBUTE); |
| } |
| } |
| |
| private FormatSpec() { |
| // This utility class is not publicly instantiable. |
| } |
| } |
