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fix matcher for woff & woff2 #70

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fix matcher for woff & woff2 #70

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a80c9bd
fix matcher for woff & woff2
zimond Jul 13, 2022
9d3bd2a
support ttc
zimond Oct 26, 2022
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12 changes: 2 additions & 10 deletions src/matchers/font.rs
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Original file line number Diff line number Diff line change
@@ -1,27 +1,19 @@
/// Returns whether a buffer is WOFF font data.
pub fn is_woff(buf: &[u8]) -> bool {
buf.len() > 7
buf.len() > 3
&& buf[0] == 0x77
&& buf[1] == 0x4F
&& buf[2] == 0x46
&& buf[3] == 0x46
&& buf[4] == 0x00
&& buf[5] == 0x01
&& buf[6] == 0x00
&& buf[7] == 0x00
}

/// Returns whether a buffer is WOFF2 font data.
pub fn is_woff2(buf: &[u8]) -> bool {
buf.len() > 7
buf.len() > 3
&& buf[0] == 0x77
&& buf[1] == 0x4F
&& buf[2] == 0x46
&& buf[3] == 0x32
&& buf[4] == 0x00
&& buf[5] == 0x01
&& buf[6] == 0x00
&& buf[7] == 0x00
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@yisibl yisibl Jul 13, 2022 •
edited

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I think it should be the difference between TrueType(0x00010000) and OTF(OTTO, 0x4F54544F)

https://github.com/junmer/is-woff/blob/f66b0846497788bbb6d8f78e2d07106919232089/index.js#L9-L27

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Spec: https://www.w3.org/TR/WOFF/#WOFFHeader

The flavor field corresponds to the "sfnt version" field found at the beginning of an sfnt file, indicating the type of font data contained. Although only fonts of type 0x00010000 (the version number 1.0 as a 16.16 fixed-point value, indicating TrueType glyph data) and 0x4F54544F (the tag 'OTTO', indicating CFF glyph data) are widely supported at present, it is not an error in the WOFF file if the flavor field contains a different value, indicating a WOFF-packaged version of a different sfnt flavor. (The value 0x74727565 'true' has been used for some TrueType-flavored fonts on Mac OS, for example.) Whether client software will actually support other types of sfnt font data is outside the scope of the WOFF specification, which simply describes how the sfnt is repackaged for Web use.

}

/// Returns whether a buffer is TTF font data.
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