运行font-spider命令，执行成功！但是生成的文件部分字体为NaN，导致font-family失效。
思源黑体，生成文件如下：
File font/SourceHanSans-ExtraLight.eot created: NaN KB
File font/SourceHanSans-ExtraLight.woff2 created: 1.024 KB
File font/SourceHanSans-ExtraLight.woff created: NaN KB
File font/SourceHanSans-ExtraLight.ttf created: 0 KB
File font/SourceHanSans-ExtraLight.svg created: NaN KB

Undefined offset: 1056 in /php-font-lib-master/src/FontLib/Table/Type/post.php
This happens when using the following font file:
https://s3-us-west-2.amazonaws.com/app.getstencil.com/upld86d1d1bf

Here's a screenshot of my OSX, showing that the file seems to be a proper font file:

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First I'm not a native English speaking person.
so you can correct it where it is wrong grammar/ wrong intention or not proper.

You CAN HELP ME create the topics that you want to know.
so I will create a description for it

:)

https://github.com/w3c/woff/blob/4b08e75f0e7ae78353985d6b6b109438f6beb921/woff2/index.html#L1077

The most significant bit of a flag indicates whether the point is on- or off-curve point, the remaining seven bits of the flag determine the format of X and Y coordinate values and specify 128 possible combinations of indices that have been assigned taking into consideration typical statistical di