mirror of
https://github.com/storytold/craft-libs.git
synced 2026-11-14 06:22:24 +00:00
Dylan M. TaylorandMartin Ball
dbed0a83ea
The [MS-PST] reader of MailCraft crates/pst at a44a450, moved as it is: the node database, heap, property and table contexts, folders, messages, recipients, attachments, named properties, recurrence blobs and list streams, with its limits, salvage and tests. Left in MailCraft for now: the compressed-RTF and RTF text reading and the code-page name table, which are not part of the .pst format. Co-authored-by: Martin Ball <98639962+benandez@users.noreply.github.com>
51 lines
1.4 KiB
Rust
51 lines
1.4 KiB
Rust
//! Little-endian reads out of a byte slice that fail instead of panicking.
|
|
|
|
use crate::error::{Error, Result};
|
|
|
|
const SHORT: Error = Error::Corrupt("a structure runs past its end");
|
|
|
|
pub(crate) fn slice(b: &[u8], at: usize, len: usize) -> Result<&[u8]> {
|
|
let end = at.checked_add(len).ok_or(SHORT)?;
|
|
b.get(at..end).ok_or(SHORT)
|
|
}
|
|
|
|
pub(crate) fn u8_at(b: &[u8], at: usize) -> Result<u8> {
|
|
b.get(at).copied().ok_or(SHORT)
|
|
}
|
|
|
|
pub(crate) fn u16_at(b: &[u8], at: usize) -> Result<u16> {
|
|
let s = slice(b, at, 2)?;
|
|
Ok(u16::from_le_bytes([s.first().copied().unwrap_or(0), s.get(1).copied().unwrap_or(0)]))
|
|
}
|
|
|
|
pub(crate) fn u32_at(b: &[u8], at: usize) -> Result<u32> {
|
|
let s = slice(b, at, 4)?;
|
|
let mut a = [0u8; 4];
|
|
a.copy_from_slice(s);
|
|
Ok(u32::from_le_bytes(a))
|
|
}
|
|
|
|
pub(crate) fn u64_at(b: &[u8], at: usize) -> Result<u64> {
|
|
let s = slice(b, at, 8)?;
|
|
let mut a = [0u8; 8];
|
|
a.copy_from_slice(s);
|
|
Ok(u64::from_le_bytes(a))
|
|
}
|
|
|
|
pub(crate) fn array16(b: &[u8], at: usize) -> Result<[u8; 16]> {
|
|
let s = slice(b, at, 16)?;
|
|
let mut a = [0u8; 16];
|
|
a.copy_from_slice(s);
|
|
Ok(a)
|
|
}
|
|
|
|
/// UTF-16LE text, lossy; an odd last byte and trailing NULs are dropped.
|
|
pub(crate) fn utf16(b: &[u8]) -> String {
|
|
let units: Vec<u16> = b.as_chunks::<2>().0.iter().map(|c| u16::from_le_bytes(*c)).collect();
|
|
let mut s = String::from_utf16_lossy(&units);
|
|
while s.ends_with('\0') {
|
|
s.pop();
|
|
}
|
|
s
|
|
}
|