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remove map_struct helper 

if we ever need this it should be marked as unsafe!

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2020-08-17 11:53:01 +02:00
parent 3fa2b983c1
commit c1d7d708d4
1 changed files with 0 additions and 26 deletions
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26
src/tools.rs
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@ -62,32 +62,6 @@ pub trait BufferedRead {
fn buffered_read(&mut self, offset: u64) -> Result<&[u8], Error>; fn buffered_read(&mut self, offset: u64) -> Result<&[u8], Error>;
} }
/// Directly map a type into a binary buffer. This is mostly useful
/// for reading structured data from a byte stream (file). You need to
/// make sure that the buffer location does not change, so please
/// avoid vec resize while you use such map.
///
/// This function panics if the buffer is not large enough.
pub fn map_struct<T>(buffer: &[u8]) -> Result<&T, Error> {
if buffer.len() < ::std::mem::size_of::<T>() {
bail!("unable to map struct - buffer too small");
}
Ok(unsafe { &*(buffer.as_ptr() as *const T) })
}
/// Directly map a type into a mutable binary buffer. This is mostly
/// useful for writing structured data into a byte stream (file). You
/// need to make sure that the buffer location does not change, so
/// please avoid vec resize while you use such map.
///
/// This function panics if the buffer is not large enough.
pub fn map_struct_mut<T>(buffer: &mut [u8]) -> Result<&mut T, Error> {
if buffer.len() < ::std::mem::size_of::<T>() {
bail!("unable to map struct - buffer too small");
}
Ok(unsafe { &mut *(buffer.as_ptr() as *mut T) })
}
/// Split a file into equal sized chunks. The last chunk may be /// Split a file into equal sized chunks. The last chunk may be
/// smaller. Note: We cannot implement an `Iterator`, because iterators /// smaller. Note: We cannot implement an `Iterator`, because iterators
/// cannot return a borrowed buffer ref (we want zero-copy) /// cannot return a borrowed buffer ref (we want zero-copy)