elf64 0.1.2

Parse elf format
Documentation 
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use core::fmt;
use super::{Address, Offset, Error, Encoding, Entry};

#[derive(Clone, Debug, Eq, PartialEq)]
pub enum Index {
    Undefined,
    ProcessorSecific(u8),
    EnvironmentSpecific(u8),
    AbsoluteValue,
    Common,
    Regular(u16),
}

impl From<u16> for Index {
    fn from(v: u16) -> Self {
        match v {
            0x0000 => Index::Undefined,
            t @ 0xff00..=0xff1f => Index::ProcessorSecific((t & 0x001f) as u8),
            t @ 0xff20..=0xff3f => Index::EnvironmentSpecific((t & 0x001f) as u8),
            0xfff1 => Index::AbsoluteValue,
            0xfff2 => Index::Common,
            t => Index::Regular(t),
        }
    }
}

#[derive(Clone, Debug, Eq, PartialEq)]
pub enum SectionType {
    Null,
    ProgramBits,
    SymbolTable,
    StringTable,
    Rela,
    Hash,
    Dynamic,
    Note,
    NoBits,
    Rel,
    Shlib,
    DynamicSymbolTable,
    OsSpecific(u32),
    ProcessorSprcific(u32),
    Unknown(u32),
}

impl From<u32> for SectionType {
    fn from(v: u32) -> Self {
        match v {
            0x00000000 => SectionType::Null,
            0x00000001 => SectionType::ProgramBits,
            0x00000002 => SectionType::SymbolTable,
            0x00000003 => SectionType::StringTable,
            0x00000004 => SectionType::Rela,
            0x00000005 => SectionType::Hash,
            0x00000006 => SectionType::Dynamic,
            0x00000007 => SectionType::Note,
            0x00000008 => SectionType::NoBits,
            0x00000009 => SectionType::Rel,
            0x0000000a => SectionType::Shlib,
            0x0000000b => SectionType::DynamicSymbolTable,
            t @ 0x60000000..=0x6fffffff => SectionType::OsSpecific(t),
            t @ 0x70000000..=0x7fffffff => SectionType::ProcessorSprcific(t),
            t => SectionType::Unknown(t),
        }
    }
}

bitflags! {
    pub struct SectionFlags: u32 {
        const WRITE = 0b00000001;
        const ALLOC = 0b00000010;
        const EXECINSTR = 0b00000100;
    }
}

#[derive(Clone, Eq, PartialEq)]
pub struct SectionHeader {
    pub name: u32,
    pub ty: SectionType,
    pub flags: SectionFlags,
    pub address: Address,
    pub offset: Offset,
    pub size: u64,
    pub link: Index,
    pub info: u32,
    pub address_alignment: u64,
    pub number_of_entries: u64,
}

impl fmt::Debug for SectionHeader {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("SectionHeader")
            .field("name", &self.name)
            .field("type", &self.ty)
            .field("flags", &self.flags)
            .field("address", &format_args!("0x{:016x}", self.address))
            .field("offset", &format_args!("0x{:016x}", self.offset))
            .field("size", &format_args!("0x{:016x}", self.size))
            .field("link", &self.link)
            .field("info", &self.info)
            .field(
                "address_alignment",
                &format_args!("0x{:016x}", self.address_alignment),
            )
            .field("number_of_entries", &self.number_of_entries)
            .finish()
    }
}

impl Entry for SectionHeader {
    type Error = Error;

    const SIZE: usize = 0x40;

    fn new(slice: &[u8], encoding: Encoding) -> Result<Self, Self::Error> {
        if slice.len() < Self::SIZE {
            return Err(Error::SliceTooShort);
        }

        // WARNING:
        //  slice[0x0c..0x10]
        //  slice[0x2a..0x2c]
        // ignored
        Ok(SectionHeader {
            name: read_int!(&slice[0x00..], &encoding, u32),
            ty: read_int!(&slice[0x04..], &encoding, u32).into(),
            flags: SectionFlags::from_bits_truncate(read_int!(&slice[0x08..], &encoding, u32)),
            address: read_int!(&slice[0x10..], &encoding, u64),
            offset: read_int!(&slice[0x18..], &encoding, u64),
            size: read_int!(&slice[0x20..], &encoding, u64),
            link: read_int!(&slice[0x28..], &encoding, u16).into(),
            info: read_int!(&slice[0x2c..], &encoding, u32),
            address_alignment: read_int!(&slice[0x30..], &encoding, u64),
            number_of_entries: read_int!(&slice[0x38..], &encoding, u64),
        })
    }
}