macho2 0.6.2

A better MachO parser library
Documentation 
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use nom::number::complete::{le_u32, le_u64};

use crate::{helpers::string_upto_null_terminator, macho::MachOResult};

use super::{pad_to_size, LCLoadCommand, LoadCommandBase, LoadCommandParser};

#[derive(Debug, PartialEq, Eq)]
pub struct FilesetEntryCommand {
    pub cmd: LCLoadCommand,
    pub cmdsize: u32,
    pub vmaddr: u64,
    pub fileoff: u64,
    pub entry_id: String,
    pub reserved: u32,
}

impl LoadCommandParser for FilesetEntryCommand {
    fn parse(ldcmd: &[u8]) -> MachOResult<Self> {
        let (cursor, base) = LoadCommandBase::parse(ldcmd)?;
        let (cursor, vmaddr) = le_u64(cursor)?;
        let (cursor, fileoff) = le_u64(cursor)?;
        let (cursor, entry_id_offset) = le_u32(cursor)?;
        let (_, reserved) = le_u32(cursor)?;

        let (_, entry_id) = string_upto_null_terminator(&ldcmd[entry_id_offset as usize..])?;

        Ok(
            FilesetEntryCommand {
                cmd: base.cmd,
                cmdsize: base.cmdsize,
                vmaddr,
                fileoff,
                entry_id,
                reserved,
            },
        )
    }

    fn serialize(&self) -> Vec<u8> {
        let mut buf = Vec::new();
        buf.extend(self.cmd.serialize());
        buf.extend(self.cmdsize.to_le_bytes());
        buf.extend(self.vmaddr.to_le_bytes());
        buf.extend(self.fileoff.to_le_bytes());
        buf.extend((0x20 as u32).to_le_bytes()); // entry_id offset
        buf.extend(self.reserved.to_le_bytes());
        buf.extend(self.entry_id.as_bytes());
        buf.push(0);
        pad_to_size(&mut buf, self.cmdsize as usize);
        buf
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::command::LCLoadCommand;

    #[test]
    fn test_fileset_entry_serialise() {
        let cmd = FilesetEntryCommand {
            cmd: LCLoadCommand::LcFilesetEntry,
            cmdsize: 47,
            vmaddr: 1,
            fileoff: 2,
            entry_id: "com.apple.dyld".to_string(),
            reserved: 3,
        };

        let serialized = cmd.serialize();
        let deserialized = FilesetEntryCommand::parse(&serialized).unwrap();
        assert_eq!(cmd, deserialized);
    }
}