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use serde::{ser::SerializeSeq, Serialize, Serializer};
use std::fmt;
/// # SMBIOS Strings
///
/// The strings part/section of a structure
pub struct Strings {
strings: Vec<Vec<u8>>,
current_string_index: usize,
}
impl Strings {
/// Creates a new strings section of a structure
pub fn new(string_area: Vec<u8>) -> Strings {
Strings {
strings: {
if string_area == &[] {
vec![]
} else {
string_area
.split(|num| *num == 0)
.into_iter()
.map(|string_slice| string_slice.to_vec())
.collect()
}
},
current_string_index: 0,
}
}
fn reset(&mut self) {
self.current_string_index = 0;
}
/// Returns a [String] at the given `index`
///
/// BIOS strings are 1 based indexing
pub fn get_string(&self, index: u8) -> Option<String> {
let index_usize = index as usize;
if index_usize == 0 || index_usize > self.strings.len() {
// BIOS strings are 1 based indexing, ignore bad input
return None;
}
// Create an ISO-8859-1 String. Each `u8 as char` operation maps a u8
// value (0xNN) to a Unicode code point (0x00NN).
//
// SMBIOS specification does not state that a BIOS string is ISO-8859-1 or
// ASCII (or anything else). The reason it is important to use ISO-8859-1
// is that every u8 value (0-255) is represented and mapped 1:1 with a Unicode
// value. Therefore, it is possible to reverse the process, starting from a
// Rust String or str and produce the original u8 array of values.
//
// Presently there is no need to convert back to a u8 array. If there were,
// the Rust char functions len_utf8() and encode_utf8() can be used. If len_utf8()
// == 2 then the original u8 can be arrived at by combining bits from the two bytes.
Some(
self.strings[index_usize - 1]
.iter()
.map(|x| *x as char)
.collect(),
)
}
/// Iterates the raw bytes of the strings. The terminating 0 is not included in each string.
pub fn iter(&self) -> std::slice::Iter<'_, Vec<u8>> {
self.strings.iter()
}
}
impl Iterator for Strings {
type Item = String;
fn next(&mut self) -> Option<Self::Item> {
if self.current_string_index == self.strings.len() {
self.reset();
return None;
}
// "*x as char" is ISO-8859-1.
let result: String = self.strings[self.current_string_index]
.iter()
.map(|x| *x as char)
.collect();
self.current_string_index = self.current_string_index + 1;
Some(result)
}
}
impl IntoIterator for &Strings {
type Item = String;
type IntoIter = Strings;
fn into_iter(self) -> Self::IntoIter {
Strings {
strings: self.strings.clone(),
current_string_index: 0,
}
}
}
impl fmt::Debug for Strings {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_list().entries(self.into_iter()).finish()
}
}
impl Serialize for Strings {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let strings: Vec<String> = self.into_iter().collect();
let mut seq = serializer.serialize_seq(Some(strings.len()))?;
for e in strings {
seq.serialize_element(&e)?;
}
seq.end()
}
}