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Apply suggestions from code review
Co-authored-by: Waffle Maybe <waffle.lapkin@gmail.com>
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@ -85,8 +85,8 @@ fn read_section<'a>(dylib_binary: &'a [u8], section_name: &str) -> io::Result<&'
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}
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/// Check the version of rustc that was used to compile a proc macro crate's
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///
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/// binary file.
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///
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/// A proc macro crate binary's ".rustc" section has following byte layout:
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/// * [b'r',b'u',b's',b't',0,0,0,5] is the first 8 bytes
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/// * ff060000 734e6150 is followed, it's the snappy format magic bytes,
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@ -96,8 +96,8 @@ fn read_section<'a>(dylib_binary: &'a [u8], section_name: &str) -> io::Result<&'
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/// The bytes you get after decompressing the snappy format portion has
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/// following layout:
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/// * [b'r',b'u',b's',b't',0,0,0,5] is the first 8 bytes(again)
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/// * [crate root bytes] next 4 bytes is to store crate root position,
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/// according to rustc's source code comment
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/// * [crate root bytes] next 8 bytes (4 in old versions) is to store
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/// crate root position, according to rustc's source code comment
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/// * [length byte] next 1 byte tells us how many bytes we should read next
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/// for the version string's utf8 bytes
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/// * [version string bytes encoded in utf8] <- GET THIS BOI
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@ -119,7 +119,7 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
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}
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let version = u32::from_be_bytes([dot_rustc[4], dot_rustc[5], dot_rustc[6], dot_rustc[7]]);
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// Last supported version is:
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// https://github.com/rust-lang/rust/commit/0696e79f2740ad89309269b460579e548a5cd632
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// https://github.com/rust-lang/rust/commit/b94cfefc860715fb2adf72a6955423d384c69318
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let (snappy_portion, bytes_before_version) = match version {
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5 | 6 => (&dot_rustc[8..], 13),
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7 | 8 => {
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@ -153,9 +153,9 @@ pub fn read_version(dylib_path: &AbsPath) -> io::Result<String> {
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// 1 byte for length of version string
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// so 13 or 17 bytes in total, and we should check the last of those bytes
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// to know the length
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let mut bytes_before_version = vec![0u8; bytes_before_version];
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uncompressed.read_exact(&mut bytes_before_version)?;
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let length = *bytes_before_version.last().unwrap();
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let mut bytes = [0u8; 17];
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uncompressed.read_exact(&mut bytes[..bytes_before_version])?;
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let length = bytes[bytes_before_version - 1];
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let mut version_string_utf8 = vec![0u8; length as usize];
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uncompressed.read_exact(&mut version_string_utf8)?;
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