无法使用NodeJS解压zlib压缩文件

Question

我有一个用 ZLIB 压缩的 22 字节有效负载。我可以使用以下代码片段在 Java 中将文件解压缩为原始 14 字节字符串：

public static void main(String[] args) throws Exception {
    byte[] compressedData = readFile(INPUT_FILE);
    System.out.println("Compressed data (hex): " + bytesToHex(compressedData));
    System.out.println("Compressed data length: " + compressedData.length);

    byte[] uncompressedData = inflateData(compressedData, UNCOMPRESSED_LENGTH);
    String outputString = new String(uncompressedData);
    System.out.println("Uncompressed data: " + outputString);
}

public static byte[] readFile(String filePath) throws IOException {
    try (FileInputStream fis = new FileInputStream(filePath); FileChannel fileChannel = fis.getChannel()) {
        ByteBuffer buffer = ByteBuffer.allocate((int) fileChannel.size());
        fileChannel.read(buffer);
        return buffer.array();
    }
}

public static byte[] inflateData(byte[] compressedData, int uncompressedLength) throws DataFormatException, IOException {
    Inflater inflater = new Inflater();
    inflater.setInput(compressedData);
    byte[] uncompressedData = new byte[uncompressedLength];
    int resultLength = inflater.inflate(uncompressedData);
    if (resultLength != uncompressedLength) {
        throw new IOException("Unexpected uncompressed length: expected " + uncompressedLength + ", got " + resultLength);
    }
    inflater.end();
    return uncompressedData;
}

但是在 NodeJS 中我无法膨胀这个文件。我尝试过使用这些选项，也尝试过 Pako，但没有成功。

const compressed = fs.readFileSync(INPUT_FILE);
console.log(`Compressed data (hex): ${compressed.toString('hex')}`);
console.log(`Compressed data length: ${compressed.length}`);

const uncompressedData: Buffer = await inflateAsync(compressed);
console.log(`Decompressed data length: ${uncompressedData.length}`);

if (uncompressedData.length !== UNCOMPRESSED_LENGTH) {
  throw new Error(`Unexpected uncompressed length: expected ${UNCOMPRESSED_LENGTH}, got ${uncompressedData.length}`);
}

当前错误是

Error: unexpected end of file

。我对此有点困惑，你知道发生了什么事吗？

仅供参考：这个 22 字节文件的十六进制字符串是

789cf2cacfc8cbab5408c928cd4b492d02000000ffff

，并且在 Java 和 NodeJS 代码中输出相同。

Answer 1

您的数据是不完整的 zlib 流。报告的错误是正确的。