我有一个带有一些固定大小数组的结构:
struct PublicHeaderBlock_LAS14 {
file_signature: [u8; 4],
file_source_id: u16,
global_encoding: u16,
project_id_data_1: u32,
project_id_data_2: u16,
project_id_data_3: u16,
project_id_data_4: [u8; 8],
version_major: u8,
version_minor: u8,
systemIdentifier: [u8; 32], // ...
}
我正在从文件中以字节为单位读取数据,将其复制到固定大小的数组中,并将这些字节逐位地复制到结构体中。
fn create_header_struct_las14(&self, buff: &[u8; 373]) -> PublicHeaderBlock_LAS14 {
PublicHeaderBlock_LAS14 {
file_signature: [buff[0], buff[1], buff[2], buff[3]],
file_source_id: (buff[4] | buff[5] << 7) as u16,
global_encoding: (buff[6] | buff[7] << 7) as u16,
project_id_data_1: (buff[8] | buff[9] << 7 | buff[10] << 7 | buff[11] << 7) as u32,
project_id_data_2: (buff[12] | buff[13] << 7) as u16,
project_id_data_3: (buff[14] | buff[15] << 7) as u16,
project_id_data_4: [buff[16], buff[17], buff[18], buff[19], buff[20], buff[21], buff[22], buff[23]],
version_major: buff[24],
version_minor: buff[25],
systemIdentifier: buff[26..58]
}
}
最后一行(systemIdentifier
)无效,因为在结构体中它是一个[u8; 32]
,而buff[26..58]
是一个切片。我可以将一个切片转换为一个固定大小的数组,并覆盖指定范围内的值,而不是像对file_signature
所做的那样手动赋值吗?
make_array<A>(slice: &[T]) -> A
...但到目前为止,我还没有成功。 - Matthieu M.