使用zlib解压时总是得到Z_DATA_ERROR

[lgw15046]

有一个文件，大小为2024096字节，该文件的前2323个字节没有经过zlib库压缩，从第2323位后直到文件结尾用zlib压缩，我现在想把从第2323位后直到文件结尾的这些字符解压出来，但是总得到Z_DATA_ERROR，我的代码如下：

int inf(FILE *source, FILE *dest)
{
    int ret;
    unsigned have;
    z_stream strm;
    unsigned char in[CHUNK];
    unsigned char out[CHUNK];

    /* allocate inflate state */
    strm.zalloc = Z_NULL;
    strm.zfree = Z_NULL;
    strm.opaque = Z_NULL;
    strm.avail_in = 0;
    strm.next_in = Z_NULL;
    ret = inflateInit(&strm);
 //   ret = inflateInit2(&strm,8);

    if (ret != Z_OK)
        return ret;

    /* decompress until deflate stream ends or end of file */
    do {
        strm.avail_in = fread(in, 1, CHUNK, source);
        printf("strm.avail_in=%d\n",strm.avail_in);
        if (ferror(source)) {
            (void)inflateEnd(&strm);
            return Z_ERRNO;
        }
        printf("can go\n");
        if (strm.avail_in == 0)
            break;
        strm.next_in = in;

        /* run inflate() on input until output buffer not full */
        do {
            strm.avail_out = CHUNK;
            strm.next_out = out;
            ret = inflate(&strm, Z_NO_FLUSH);
            printf("ret=%d\n;Z_NEED_DICT = %d;Z_DATA_ERROR=%d;",ret,Z_NEED_DICT,Z_DATA_ERROR);
            assert(ret != Z_STREAM_ERROR);  /* state not clobbered */
            switch (ret) {
            case Z_NEED_DICT:
                ret = Z_DATA_ERROR;     /* and fall through */
            case Z_DATA_ERROR:
            case Z_MEM_ERROR:
                (void)inflateEnd(&strm);
                return ret;
            }
            have = CHUNK - strm.avail_out;
            if (fwrite(out, 1, have, dest) != have || ferror(dest)) {
                (void)inflateEnd(&strm);
                return Z_ERRNO;
            }
        } while (strm.avail_out == 0);

        /* done when inflate() says it's done */
    } while (ret != Z_STREAM_END);

    /* clean up and return */
    (void)inflateEnd(&strm);
    return ret == Z_STREAM_END ? Z_OK : Z_DATA_ERROR;
}
void zerr(int ret)
{
    printf("zpipe: \n", stderr);
    switch (ret) {
    case Z_ERRNO:
        if (ferror(stdin))
            printf("error reading stdin\n", stderr);
        if (ferror(stdout))
            printf("error writing stdout\n", stderr);
        break;
    case Z_STREAM_ERROR:
        printf("invalid compression level\n", stderr);
        break;
    case Z_DATA_ERROR:
        printf("invalid or incomplete deflate data\n", stderr);
        break;
    case Z_MEM_ERROR:
        printf("out of memory\n", stderr);
        break;
    case Z_VERSION_ERROR:
        printf("zlib version mismatch!\n", stderr);
    }
}
int main()
{
  　FILE *originalFile = fopen("/root/Desktop/lgw_file_write/folder/jiangbei_original.lg4","a+");
    FILE *tempFile = fopen("/root/Desktop/lgw_file_write/folder/1010_change.lg4","a+");
    char largeBuf[5000000];
    fseek(originalFile,2323,0);
    int readLeng =fread(largeBuf,1,2024096-2323,originalFile);
    int writeLeng = fwrite(largeBuf,1,readLeng,tempFile);
    printf("readLeng = %d;writeLeng =%d\n",readLeng,writeLeng);
    if(originalFile != NULL)
    {
        fclose(originalFile);
        originalFile = NULL;
    }
    if(tempFile != NULL)
    {
        fclose(tempFile);
        tempFile = NULL;
    }
    FILE *originalFile2 = fopen("/root/Desktop/lgw_file_write/folder/1010_change.lg4","ab+");
    FILE *uncompressFile = fopen("/root/Desktop/lgw_file_write/folder/1010_change_uncompress.lg4","ab+");
   int infRet = inf(originalFile2,uncompressFile);//使用这个函数解压
    printf("the infRet = %d\n",infRet);
    if(originalFile2 != NULL)
    {
        fclose(originalFile2);
        originalFile2 = NULL;
    }
    printf("segment?\n");
    if(uncompressFile != NULL)
    {
        fclose(uncompressFile);
        uncompressFile = NULL;
    }
}

请教各位使用过zlib压缩库的朋友们，多谢了！

[cydenghua]

哥们， 解决了吗， 我也有这个问题。

[赵4老师]

推荐使用WinHex软件查看硬盘或文件或内存中的原始字节内容。 不要把 fopen("...","...");fscanf,fprintf,fclose //读时把\r\n替换成\n，写时把\n替换成\r\n;读到\x1a就设置EOF;读写的内容当字符看待 和 fopen("...","...b");fread,fwrite,fclose //不作以上替换，遇到\x1a仍继续读;读写的内容当字节看待 弄混了

[bu进ze退]

可能是参数之间转换时出现的错误，http://www.360doc.com/content/11/1025/11/6979751_159010908.shtml