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我想知道如何在Delphi中将big-endian数字转换为本机数字.我正在移植一些我遇到的C++代码:

unsigned long blockLength  = *blockLengthPtr++ << 24;
blockLength |= *blockLengthPtr++ << 16;
blockLength |= *blockLengthPtr++ << 8;
blockLength |= *blockLengthPtr;

unsigned long dataLength  = *dataLengthPtr++ << 24;
dataLength |= *dataLengthPtr++ << 16;
dataLength |= *dataLengthPtr++ << 8;
dataLength |= *dataLengthPtr;

我不熟悉C++,所以我不明白这些运算符是做什么的.