保证源大小

🌐 Pledged Source Size

可以通过 opts.pledgedSrcSize 指定未压缩输入的预计总大小，该值必须是非负的安全整数。如果输入结束时大小不匹配，压缩将失败，并返回代码 ZSTD_error_srcSize_wrong。

🌐 It's possible to specify the expected total size of the uncompressed input via opts.pledgedSrcSize, which must be a non-negative safe integer. If the size doesn't match at the end of the input, compression will fail with the code ZSTD_error_srcSize_wrong.