Java：从流更新 CRC32

发布于 2024-12-12 19:45:30 字数 797 浏览 2 评论 0原文

我是否误解了使用 CRC32 或 CheckedInputStream 类通过不断更新最新输入来计算校验和？当输入 <= 128KiB 时，会生成有效的 CRC32。任何大于 128KiB 的内容都会导致校验和失败。下面是我正在使用的一些代码（使用 CRC32 对象和 BufferedInputStream 但如果我使用 CheckedInputStream 来跟踪，也会发生同样的问题CRC32）。

我将不胜感激任何建议或意见，谢谢

private static long calcCRC32() throws IOException {
    BufferedInputStream inStream = new BufferedInputStream(System.in);
    int BLOCK_SIZE = 128*1024; //128KiB
    int len;
    byte[] buffer = new byte[BLOCK_SIZE];

    CRC32 crc32 = new CRC32();
    crc32.reset();

    while((len = bufferedInputStream.read(buffer, 0, BLOCK_SIZE)) > 0){         
        crc32.update(buffer, 0, len);
        buffer = new byte[BLOCK_SIZE];
    }

    return crc32.getValue();
}

原文

Am I misunderstanding the use of either of the CRC32 or CheckedInputStream classes to calculate a checksum by continuously updating with the latest input? When the input is <= 128KiB a valid CRC32 is generated. Anything larger than 128KiB and the checksum fails. Below is some code I am working with (using a CRC32 object and BufferedInputStream but the same problem happens if I use a CheckedInputStream to keep track of the CRC32).

I would appreciate any advice or comments, thank you

private static long calcCRC32() throws IOException {
    BufferedInputStream inStream = new BufferedInputStream(System.in);
    int BLOCK_SIZE = 128*1024; //128KiB
    int len;
    byte[] buffer = new byte[BLOCK_SIZE];

    CRC32 crc32 = new CRC32();
    crc32.reset();

    while((len = bufferedInputStream.read(buffer, 0, BLOCK_SIZE)) > 0){         
        crc32.update(buffer, 0, len);
        buffer = new byte[BLOCK_SIZE];
    }

    return crc32.getValue();
}

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