core::mem instead of std::mem

src/pe/header.rs

@@ -439,7 +439,7 @@ impl DosStub {
     /// The DOS stub is a small program that prints the message "This program cannot be run in DOS mode" and exits; and
     /// is not really read for the PECOFF file format. It's a relic from the MS-DOS era.
     pub fn new(bytes: &[u8], pe_pointer: u32) -> error::Result<Self> {
-        let start_offset = std::mem::size_of::<DosHeader>();
+        let start_offset = core::mem::size_of::<DosHeader>();
         let end_offset = pe_pointer as usize;
         if bytes.len() < end_offset as usize {
             return Err(error::Error::Malformed(format!(
@@ -940,7 +940,7 @@ impl RichHeader {
     pub fn parse(bytes: &[u8]) -> error::Result<Option<Self>> {
         // Parse the DOS header; some fields are required to locate the Rich header.
         let dos_header = DosHeader::parse(bytes)?;
-        let dos_header_end_offset = std::mem::size_of::<DosHeader>();
+        let dos_header_end_offset = core::mem::size_of::<DosHeader>();
         let pe_header_start_offset = dos_header.pe_pointer as usize;
 
         // The Rich header is not present in all PE files.