保证源大小

¥Pledged Source Size

可以通过 opts.pledgedSrcSize 指定未压缩输入的预期总大小。如果输入末尾的大小不匹配，则压缩将失败，代码为 ZSTD_error_srcSize_wrong。

¥It's possible to specify the expected total size of the uncompressed input via opts.pledgedSrcSize. If the size doesn't match at the end of the input, compression will fail with the code ZSTD_error_srcSize_wrong.