Support PDIC/Unicode format

- Borrowed from monodict copyright wak by apache-2.0

Signed-off-by: Hiroshi Miura <miurahr@linux.com>

README.md

@@ -8,6 +8,7 @@ Very simple dictionary search application supporting;
 - LingvoDSL dz compression (.dsl.dz)
 - StarDict (.ifo .dict)
 - StarDict (.dict.dz)
+- PDIC
 
 ![Application image](https://raw.githubusercontent.com/eb4j/ebviewer/main/docs/img/screen_image.png)
 
@@ -81,6 +82,8 @@ Copyright (C) 2015-2020 Aaron Madlon-Kay
 
 Copyright (C) 2007-2015 Didier Briel
 
+Copyright (C) 2014 wak
+
 Copyright (C) 2008-2010 Alex Buloichik
 
 Copyright (C) 2007 Zoltan Bartko

build.gradle.kts

@@ -74,6 +74,7 @@ dependencies {
     implementation("commons-io:commons-io:2.11.0")
     implementation("org.apache.commons:commons-lang3:3.12.0")
     implementation("tokyo.northside:url-protocol-handler:0.1.4")
+    implementation("com.ibm.icu:icu4j-charset:69.1")
 
     implementation("io.github.dictzip:dictzip:0.9.5")
     implementation("com.github.takawitter:trie4j:0.9.8")

src/main/java/io/github/eb4j/ebview/dictionary/DictionariesManager.java

@@ -35,6 +35,7 @@ public DictionariesManager() {
         factories.add(new EPWING());
         factories.add(new LingvoDSL());
         factories.add(new StarDict());
+        factories.add(new PDic());
         stemmer = new Stemmer();
     }
 

src/main/java/io/github/eb4j/ebview/dictionary/PDic.java

@@ -0,0 +1,42 @@
+package io.github.eb4j.ebview.dictionary;
+
+import io.github.eb4j.ebview.data.IDictionary;
+import io.github.eb4j.ebview.dictionary.pdic.PdicDictionary;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Set;
+
+public class PDic implements IDictionaryFactory {
+    /**
+     * Determine whether or not the supplied file is supported by this factory.
+     * This is intended to be a lightweight check, e.g. looking for a file
+     * extension.
+     *
+     * @param file The file to check
+     * @return Whether or not the file is supported
+     */
+    @Override
+    public boolean isSupportedFile(File file) {
+        return file.getPath().endsWith(".DIC") || file.getPath().endsWith(".dic");
+    }
+
+    /**
+     * Load the given file and return an {@link IDictionary} that wraps it.
+     *
+     * @param file The file to load
+     * @return An IDictionary file that can read articles from the file
+     */
+    @Override
+    public Set<IDictionary> loadDict(File file) {
+        Set<IDictionary> result = new HashSet<>();
+        try {
+            IDictionary dictionary = new PdicDictionary(file);
+            result.add(dictionary);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return result;
+    }
+}

src/main/java/io/github/eb4j/ebview/dictionary/pdic/PdicDictionary.java

@@ -0,0 +1,111 @@
+package io.github.eb4j.ebview.dictionary.pdic;
+
+import io.github.eb4j.ebview.data.DictionaryEntry;
+import io.github.eb4j.ebview.data.IDictionary;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.util.ArrayList;
+import java.util.List;
+
+public class PdicDictionary implements IDictionary {
+
+    static final Logger LOG = LoggerFactory.getLogger(PdicDictionary.class.getName());
+
+    private final File srcFile;
+    private final String cachePath;
+    private PdicInfo dicInfo;
+
+    public PdicDictionary(final File file) throws IOException {
+        this.srcFile = file;
+        cachePath = file.getPath() + ".idx";
+        final int headerSize = 256;
+        PdicHeader header; // ヘッダー
+
+        ByteBuffer headerbuff = ByteBuffer.allocate(headerSize);
+        try (FileInputStream srcStream = new FileInputStream(srcFile);
+             FileChannel srcChannel = srcStream.getChannel()) {
+            int len = srcChannel.read(headerbuff);
+            srcChannel.close();
+            if (len == headerSize) {
+                header = new PdicHeader();
+                if (header.load(headerbuff) != 0) {
+                    // Unicode辞書 かつ ver6以上のみ許容
+                    if ((header.version & 0xFF00) < 0x0600 || header.os != 0x20) {
+                        LOG.warn("Unsupported dictionary version" + srcFile.getName());
+                        throw new RuntimeException();
+                    }
+                    dicInfo = new PdicInfo(srcFile, header.header_size + header.extheader,
+                            header.block_size * header.index_block, header.nindex2, header.index_blkbit,
+                            header.block_size);
+                    if (!dicInfo.readIndexBlock(cachePath)) {
+                        LOG.warn("Failed to load dictionary index of " + srcFile.getName());
+                        throw new RuntimeException();
+                    }
+                    dicInfo.SetDicName(file.getName());
+                }
+            }
+        }
+    }
+
+    @Override
+    public String getDictionaryName() {
+        return dicInfo.GetDicName();
+    }
+
+    /**
+     * Read article's text.
+     *
+     * @param word The word to look up in the dictionary
+     * @return List of entries. May be empty, but cannot be null.
+     */
+    @Override
+    public List<DictionaryEntry> readArticles(String word) {
+        List<DictionaryEntry> lists = new ArrayList<>();
+        if (dicInfo.searchWord(word.toLowerCase())) {
+            PdicResult result = dicInfo.getResult();
+            for (int i = 0; i < result.getCount(); i ++) {
+                String disp = result.getDisp(i);
+                if (disp.equals("")) {
+                    disp = result.getIndex(i);
+                }
+                StringBuilder sb = new StringBuilder();
+                String phone = result.getPhone(i);
+                if (phone != null) {
+                    sb.append(phone).append(" / ");
+                }
+                sb.append(result.getTrans(i)).append("<br/>");
+                String sample = result.getSample(i);
+                if (sample != null) {
+                    sb.append(sample);
+                }
+                lists.add(new DictionaryEntry(disp, sb.toString(), getDictionaryName()));
+            }
+        }
+        return lists;
+    }
+
+    /**
+     * Read article's text. Matching is predictive, so e.g. supplying "term"
+     * will return articles for "term", "terminology", "termite", etc.
+     *
+     * @param word The word to look up in the dictionary
+     * @return List of entries. May be empty, but cannot be null.
+     */
+    @Override
+    public List<DictionaryEntry> readArticlesPredictive(String word) {
+        return readArticles(word);
+    }
+
+    /**
+     * Dispose IDictionary. Default is no action.
+     */
+    @Override
+    public void close() throws IOException {
+    }
+}

src/main/java/io/github/eb4j/ebview/dictionary/pdic/PdicElement.java

@@ -0,0 +1,18 @@
+/**
+ * Copyright (C) 2014 wak (Apache-2.0)
+ */
+package io.github.eb4j.ebview.dictionary.pdic;
+
+final class PdicElement {
+    public byte mAttr = 0;
+    public String mIndex = null;
+    public String mDisp = null;
+    public String mTrans = null;
+    public String mSample = null;
+    public String mPhone = null;
+
+    public PdicElement() {
+    }
+
+}
+

src/main/java/io/github/eb4j/ebview/dictionary/pdic/PdicHeader.java

@@ -0,0 +1,156 @@
+/**
+ * Copyright (C) 2014 wak (Apache-2.0)
+ */
+package io.github.eb4j.ebview.dictionary.pdic;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.charset.Charset;
+
+final class PdicHeader {
+    private final int L_HEADERNAME = 100;    //   ヘッダー部文字列長
+    private final int L_DICTITLE = 40;        //   辞書タイトル名長
+
+    public String headername; //   辞書ヘッダータイトル
+    public String dictitle;   //   辞書名
+    public short version;      //   辞書のバージョン
+    public short lword;        //   見出語の最大長
+    public short ljapa;        //   訳語の最大長
+    public short block_size;      //  (256 ) １ブロックのバイト数 固定
+    public short index_block;     //   インデックスブロック数
+    public short header_size;     //   ヘッダーのバイト数
+    public short index_size;  //  ( ) インデックスのバイト数 未使用
+
+    public short empty_block;     // 空きブロックの先頭物理ブロック番号（ないときは-1  ）
+    public short nindex;       //  ( ) インデックスの要素の数 未使用
+    public short nblock;       //  ( ) 使用データブロック数 未使用
+    public int nword;    //   登録単語数
+
+    public byte dicorder;      //   辞書の順番
+    public byte dictype;       //   辞書の種別
+
+    public byte attrlen;       //   単語属性の長さ
+    public byte os;          // OS
+    public int olenumber;      // OLE  用シリアル番号
+    public short lid_word;      //  ID 見出語言語
+
+    public short lid_japa;      //  ID 訳語部言語
+    public short lid_exp;      //  ID 用例部言語
+    public short lid_pron;      //  ID 発音記号言語
+    public short lid_other;      //  ID その他言語
+    public boolean index_blkbit;   // false:16bit, true:32bit
+    public int extheader;      //   拡張ヘッダーサイズ
+    public int empty_block2;     //   空きブロック先頭物理ブロック番号
+    public int nindex2;       //   インデックス要素の数
+    public int nblock2;       //   使用データブロック数
+
+    public int update_count;    //   辞書更新回数
+    public String dicident;      //   辞書識別子
+
+    /**
+     * コンストラクタ.
+     */
+    public PdicHeader() {
+    }
+
+    /**
+     * @param header_block ヘッダーデータ部分
+     * @return 辞書バージョン
+     */
+    public int load(ByteBuffer header_block) throws RuntimeException {
+        int ret = 0;
+        Charset sjisset = Charset.forName("X-SJIS");
+
+        byte[] headernamebuff = new byte[L_HEADERNAME];
+        byte[] dictitlebuff = new byte[L_DICTITLE];
+
+        header_block.flip();
+        header_block.order(ByteOrder.LITTLE_ENDIAN);
+        header_block.get(headernamebuff);
+        headername = sjisset.decode(ByteBuffer.wrap(headernamebuff))
+                .toString();
+        header_block.get(dictitlebuff);
+        dictitle = sjisset.decode(ByteBuffer.wrap(dictitlebuff)).toString();
+        version = header_block.getShort();
+        if ((version & 0xFF00) == 0x0500 || (version & 0xFF00) == 0x0600) {
+            lword = header_block.getShort();
+            ljapa = header_block.getShort();
+
+            block_size = header_block.getShort();
+            index_block = header_block.getShort();
+            header_size = header_block.getShort();
+            index_size = header_block.getShort();
+            empty_block = header_block.getShort();
+            nindex = header_block.getShort();
+            nblock = header_block.getShort();
+
+            nword = header_block.getInt();
+
+            dicorder = header_block.get();
+            dictype = header_block.get();
+            attrlen = header_block.get();
+            os = header_block.get();
+
+            olenumber = header_block.getInt();
+            lid_word = header_block.getShort();
+
+            lid_japa = header_block.getShort();
+            lid_exp = header_block.getShort();
+            lid_pron = header_block.getShort();
+            lid_other = header_block.getShort();
+            index_blkbit = (header_block.get() != 0);
+            header_block.get(); // dummy0
+            extheader = header_block.getInt();
+            empty_block2 = header_block.getInt();
+            nindex2 = header_block.getInt();
+            nblock2 = header_block.getInt();
+
+            // 固定部分チェック
+            if (attrlen == 1) {
+                ret = version >> 8;
+            }
+        } else if ((version & 0xFF00) == 0x0400) {
+
+            lword = header_block.getShort();
+            ljapa = header_block.getShort();
+
+            block_size = header_block.getShort();
+            index_block = header_block.getShort();
+            header_size = header_block.getShort();
+            index_size = header_block.getShort();
+            empty_block = header_block.getShort();
+            nindex = header_block.getShort();
+            nblock = header_block.getShort();
+
+            nword = header_block.getInt();
+
+            dicorder = header_block.get();
+            dictype = header_block.get();
+            attrlen = header_block.get();
+
+            olenumber = header_block.getInt();
+            os = header_block.get();
+
+            lid_word = header_block.getShort();
+            lid_japa = header_block.getShort();
+            lid_exp = header_block.getShort();
+            lid_pron = header_block.getShort();
+            lid_other = header_block.getShort();
+            extheader = header_block.getInt();
+            empty_block2 = header_block.getInt();
+            nindex2 = header_block.getInt();
+            nblock2 = header_block.getInt();
+            index_blkbit = (header_block.get() != 0);
+            // 固定部分チェック
+            if (block_size == 0x100 &&
+                    header_size == 0x100 &&
+                    attrlen == 1) {
+                ret = version >> 8;
+            }
+        } else {
+            throw new RuntimeException("Unsupported format");
+        }
+        return ret;
+    }
+
+}