java - 如何反向工程此代码以将二进制图形表转换为可编辑的 png？

Question

我正在重新绘制这个 android 游戏，所有精灵都在一个名为 gt 的文件中，这是来自 apk 的代码，它将我假设的字节码文件转换为实际图像。

它接受一个参数，即该文件的路径。

Java 并不是我真正的语言，所以我希望有人能帮助我弄清楚这段代码在做什么，以及我如何使用它来将文件转换为我可以编辑的东西，比如 png。

这是对应的源代码：

    public static void readGraphicsTable(String paramString)
{
    InputStream localInputStream = Util.getResourceAsStream(paramString);
    if (localInputStream == null)
    {
    HG.logWarning("Config file not found: " + paramString);
    return;
    }
    int j;
    int k;
    for (;;)
    {
    try
    {
        paramString = new DataInputStream(localInputStream);
        j = paramString.readShort();
        k = paramString.readShort();
        if ((j != 18260) && (k != 1281))
        {
        try
        {
            localInputStream.close();
            return;
        }
        catch (Throwable paramString)
        {
            return;
        }
        createFontOffsets();
        }
    }
    catch (Throwable paramString)
    {
        label156:
        paramString = paramString;
        HG.handleError(paramString, "Gfx.readGraphicsTable()");
        try
        {
        localInputStream.close();
        return;
        }
        catch (Throwable paramString)
        {
        return;
        }
        k = paramString.readShort();
        colors = new int[k];
        j = 0;
        if (j >= k) {
        continue;
        }
        colors[j] = paramString.readInt();
        j += 1;
        continue;
        k = paramString.readShort();
        fonts = new Font[k];
        fontOffsets = (int[][])Array.newInstance(Integer.TYPE, new int[] { k, 4 });
        j = 0;
        if (j >= k) {
        continue;
        }
        m = paramString.readByte();
        if (m != -1) {
        continue;
        }
        fonts[j] = Font.getDefaultFont();
        fontOffsets[j][0] = paramString.readByte();
        fontOffsets[j][1] = paramString.readByte();
        fontOffsets[j][2] = paramString.readByte();
        fontOffsets[j][3] = paramString.readByte();
        j += 1;
        continue;
        fonts[j] = Font.getFont(m & 0x60, m & 0x7, m & 0x18);
        continue;
    }
    finally {}
    j = paramString.readShort();
    if (j == -1) {
        break label1144;
    }
    k = paramString.readShort();
    switch (j)
    {
    case 17231: 
        paramString.skip(k);
    }
    }
    for (;;)
    {
    int m;
    try
    {
        localInputStream.close();
        throw paramString;
        k = paramString.readShort();
        imageTable = new short[k + 4][];
        images = new Image[k + 4];
        j = 0;
        if (j < k)
        {
        m = (short)paramString.readByte();
        if (m == -1) {
            break label1160;
        }
        arrayOfShort = imageTable;
        arrayOfShort1 = new short[12];
        arrayOfShort[j] = arrayOfShort1;
        m = (short)(m << 8);
        if ((m & 0x200) != 0)
        {
            int i = paramString.readShort();
            System.arraycopy(imageTable[i], 0, arrayOfShort1, 0, arrayOfShort1.length);
            arrayOfShort1[7] = ((short)(arrayOfShort1[7] | m));
            arrayOfShort1[10] = i;
            break label1160;
        }
        n = paramString.readByte();
        int i1 = paramString.readByte();
        arrayOfShort1[7] = ((short)(m | n));
        arrayOfShort1[2] = ((short)(i1 >> 4 & 0xF));
        arrayOfShort1[3] = ((short)(i1 >> 0 & 0xF));
        arrayOfShort1[4] = ((short)paramString.readByte());
        arrayOfShort1[5] = paramString.readShort();
        arrayOfShort1[6] = paramString.readShort();
        arrayOfShort1[8] = paramString.readShort();
        paramString.readUTF();
        if ((m & 0x100) == 0) {
            break label1160;
        }
        arrayOfShort1[10] = paramString.readShort();
        arrayOfShort1[11] = ((short)paramString.readByte());
        break label1160;
        }
        short[][] arrayOfShort = imageTable;
        short[] arrayOfShort1 = new short[12];
        arrayOfShort['?'] = arrayOfShort1;
        arrayOfShort1[7] = 0;
        arrayOfShort1[10] = 0;
        arrayOfShort1[2] = 1;
        arrayOfShort1[3] = 1;
        arrayOfShort1[4] = 3;
        arrayOfShort1[5] = 0;
        arrayOfShort1[6] = 0;
        arrayOfShort1[8] = 0;
        arrayOfShort = imageTable;
        arrayOfShort1 = new short[12];
        arrayOfShort['?'] = arrayOfShort1;
        arrayOfShort1[7] = 0;
        arrayOfShort1[10] = 0;
        arrayOfShort1[2] = 1;
        arrayOfShort1[3] = 1;
        arrayOfShort1[4] = 3;
        arrayOfShort1[5] = 0;
        arrayOfShort1[6] = 0;
        arrayOfShort1[8] = 0;
        arrayOfShort = imageTable;
        arrayOfShort1 = new short[12];
        arrayOfShort['?'] = arrayOfShort1;
        arrayOfShort1[7] = 0;
        arrayOfShort1[10] = 0;
        arrayOfShort1[2] = 4;
        arrayOfShort1[3] = 1;
        arrayOfShort1[4] = 3;
        arrayOfShort1[5] = 0;
        arrayOfShort1[6] = 0;
        arrayOfShort1[8] = 0;
        arrayOfShort = imageTable;
        arrayOfShort1 = new short[12];
        arrayOfShort['?'] = arrayOfShort1;
        arrayOfShort1[7] = 0;
        arrayOfShort1[10] = 0;
        arrayOfShort1[2] = 1;
        arrayOfShort1[3] = 1;
        arrayOfShort1[4] = 3;
        arrayOfShort1[5] = 0;
        arrayOfShort1[6] = 0;
        arrayOfShort1[8] = 0;
        break;
        k = paramString.readShort();
        frameTable = new short[k * 7];
        j = 0;
        break label1167;
        frameTable[(m + 2)] = ((short)paramString.readUnsignedByte());
        frameTable[(m + 3)] = ((short)paramString.readUnsignedByte());
        frameTable[(m + 0)] = ((short)paramString.readUnsignedByte());
        frameTable[(m + 1)] = ((short)paramString.readUnsignedByte());
        frameTable[(m + 4)] = ((short)paramString.readByte());
        frameTable[(m + 5)] = ((short)paramString.readByte());
        frameTable[(m + 6)] = ((short)paramString.readByte());
        break label1208;
        frameTable[(m + 2)] = paramString.readShort();
        frameTable[(m + 3)] = paramString.readShort();
        frameTable[(m + 0)] = paramString.readShort();
        frameTable[(m + 1)] = paramString.readShort();
        frameTable[(m + 4)] = paramString.readShort();
        frameTable[(m + 5)] = paramString.readShort();
        frameTable[(m + 6)] = ((short)paramString.readByte());
        break label1208;
        m = paramString.readShort();
        animationTable = new short[m][];
        j = 0;
        if (j >= m) {
        break;
        }
        int n = paramString.readShort();
        arrayOfShort = animationTable;
        arrayOfShort1 = new short[n + 2];
        arrayOfShort[j] = arrayOfShort1;
        k = 0;
        if (k >= n + 2) {
        break label1215;
        }
        arrayOfShort1[k] = paramString.readShort();
        k += 1;
        continue;
        paramString.skip(k);
        break;
        try
        {
        label1144:
        localInputStream.close();
        return;
        }
        catch (Throwable paramString)
        {
        return;
        }
    }
    catch (Throwable localThrowable)
    {
        continue;
    }
    break label156;
    label1160:
    j += 1;
    continue;
    label1167:
    while (j < k)
    {
        m = j * 7;
        switch (8)
        {
        }
        label1208:
        j += 1;
    }
    break;
    label1215:
    j += 1;
    }
}

标签： javaandroid