fn read_block_metadata()

in crates/core/src/file_group/log_file/reader.rs [162:195]

• 34 lines of code
• 4 McCabe index (conditional complexity)

    fn read_block_metadata(
        &mut self,
        metadata_type: BlockMetadataType,
        format_version: &LogFormatVersion,
    ) -> Result<HashMap<BlockMetadataKey, String>> {
        match metadata_type {
            BlockMetadataType::Header if !format_version.has_header() => {
                return Ok(HashMap::new());
            }
            BlockMetadataType::Footer if !format_version.has_footer() => {
                return Ok(HashMap::new());
            }
            _ => {}
        }
        let mut num_entries_buf = [0u8; 4];
        self.reader.read_exact(&mut num_entries_buf)?;
        let num_entries = u32::from_be_bytes(num_entries_buf);
        let mut metadata: HashMap<BlockMetadataKey, String> =
            HashMap::with_capacity(num_entries as usize);
        for _ in 0..num_entries {
            let mut key_buf = [0u8; 4];
            self.reader.read_exact(&mut key_buf)?;
            let key = BlockMetadataKey::try_from(key_buf)?;
            let mut value_len_buf = [0u8; 4];
            self.reader.read_exact(&mut value_len_buf)?;
            let value_len = u32::from_be_bytes(value_len_buf);
            let mut value_buf = vec![0u8; value_len as usize];
            self.reader.read_exact(&mut value_buf)?;
            let value =
                String::from_utf8(value_buf).map_err(|e| CoreError::Utf8Error(e.utf8_error()))?;
            metadata.insert(key, value);
        }
        Ok(metadata)
    }