JAVA LZW解压缩算法不是yeilding解压缩文件

Question

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.Map.Entry; 
import java.util.stream.Collectors;

public class LZW {

    private static Map<String, Integer> baseDict = new HashMap<String, Integer>();
    private static Map<Integer, String> revDict = new HashMap<Integer, String>();
    private static Scanner in = new Scanner(System.in);

    public static void makeText() {
        try {
            FileOutputStream fos = new FileOutputStream("text.txt");
            for (int n = 0; n < 5000; n++) {
                for (int i = 0; i < 256; i++) {
                    char ch = (char) i;
                    fos.write(ch);
                }
            }
            fos.close();
        } catch (IOException e) {
        // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    public static void deflate(String fileName) {

        Map<String, Integer> dict = baseDict;
        try {
            FileInputStream fis = new FileInputStream(fileName);
            FileOutputStream fos = new FileOutputStream("compressed.lzw");
            DataInputStream dis = new DataInputStream(fis);
            DataOutputStream dos = new DataOutputStream(fos);
            int iBuf;
            char cBuf;
            String sBuf = "";

            iBuf = fis.read();
            cBuf = (char) iBuf;
            sBuf += cBuf;

            while ((iBuf = fis.read()) != -1) {

                cBuf = (char) iBuf;
                String temp = sBuf + cBuf;

                if (dict.containsKey(temp)) {
                    sBuf += cBuf;
                } else {
                    fos.write(dict.get(sBuf));
                    dict.put(temp, dict.size());
                    sBuf = "";
                    sBuf += cBuf;
                }

            }
            fos.write(dict.get(sBuf));

            fis.close();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void inflate(String fileName) {

        Map<Integer, String> dict = revDict;
        try {
            FileInputStream fis = new FileInputStream(fileName);
            FileOutputStream fos = new FileOutputStream("decompressed.pdf");
            DataInputStream dis = new DataInputStream(fis);
            DataOutputStream dos = new DataOutputStream(fos);

            String entry, w;
            char ch;
            int prev, curr;

            prev = dis.read();
            w = dict.get(prev);
            dos.writeBytes(w);
            while ((curr = dis.read()) != -1) {
                if (dict.containsKey(curr)) {
                    entry = dict.get(curr);
                    dos.writeBytes(entry);
                    dict.put(dict.size(), (w + entry.charAt(0)));
                    w = entry;
                } else {
                    entry = w + w.charAt(0);
                    dos.writeBytes(entry);
                    dict.put(dict.size(), entry);
                    w = entry;
                }
            }

            dis.close();
            dos.close();
         } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void init() {
        for (int i = 0; i < 256; i++) {
            char ascii = (char) i;
            baseDict.put(("" + ascii), i);
            revDict.put(i, ("" + ascii));
        }
        deflate("original.pdf");
        inflate("compressed.lzw");
    }

    public static void main(String[] args) {
        init();
    }

}

所以我一直在努力使用LZW压缩来压缩不同的文件。我的压缩功能似乎工作正常，因为我能够将5000kb pdf压缩到大约2200kb。但是我的解压缩算法无法解压缩pdf。生成的文件仍然与压缩文件大小相同，并且pdf已损坏。我正在遵循一些伪代码：

read a character k;
output k;
w = k;
while ( read a character k )    
/* k could be a character or a code. */
{
    if k exists in the dictionary
        entry = dictionary entry for k;
        output entry;
        add w + entry[0] to dictionary;
        w = entry;
    else
        output entry = w + firstCharacterOf(w);
        add entry to dictionary;
        w = entry;
}

有人能引导我朝正确的方向指导为什么我的减压功能是错误的吗？