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use crate::read::{Architecture, Error, ReadError, ReadRef, Result};
use crate::{macho, BigEndian, Pod};
pub use macho::{FatArch32, FatArch64, FatHeader};
impl FatHeader {
/// Attempt to parse a fat header.
///
/// Does not validate the magic value.
pub fn parse<'data, R: ReadRef<'data>>(file: R) -> Result<&'data FatHeader> {
file.read_at::<FatHeader>(0)
.read_error("Invalid fat header size or alignment")
}
/// Attempt to parse a fat header and 32-bit fat arches.
pub fn parse_arch32<'data, R: ReadRef<'data>>(file: R) -> Result<&'data [FatArch32]> {
let mut offset = 0;
let header = file
.read::<FatHeader>(&mut offset)
.read_error("Invalid fat header size or alignment")?;
if header.magic.get(BigEndian) != macho::FAT_MAGIC {
return Err(Error("Invalid 32-bit fat magic"));
}
file.read_slice::<FatArch32>(&mut offset, header.nfat_arch.get(BigEndian) as usize)
.read_error("Invalid nfat_arch")
}
/// Attempt to parse a fat header and 64-bit fat arches.
pub fn parse_arch64<'data, R: ReadRef<'data>>(file: R) -> Result<&'data [FatArch64]> {
let mut offset = 0;
let header = file
.read::<FatHeader>(&mut offset)
.read_error("Invalid fat header size or alignment")?;
if header.magic.get(BigEndian) != macho::FAT_MAGIC_64 {
return Err(Error("Invalid 64-bit fat magic"));
}
file.read_slice::<FatArch64>(&mut offset, header.nfat_arch.get(BigEndian) as usize)
.read_error("Invalid nfat_arch")
}
}
/// A trait for generic access to `FatArch32` and `FatArch64`.
#[allow(missing_docs)]
pub trait FatArch: Pod {
type Word: Into<u64>;
fn cputype(&self) -> u32;
fn cpusubtype(&self) -> u32;
fn offset(&self) -> Self::Word;
fn size(&self) -> Self::Word;
fn align(&self) -> u32;
fn architecture(&self) -> Architecture {
match self.cputype() {
macho::CPU_TYPE_ARM => Architecture::Arm,
macho::CPU_TYPE_ARM64 => Architecture::Aarch64,
macho::CPU_TYPE_X86 => Architecture::I386,
macho::CPU_TYPE_X86_64 => Architecture::X86_64,
macho::CPU_TYPE_MIPS => Architecture::Mips,
macho::CPU_TYPE_POWERPC => Architecture::PowerPc,
macho::CPU_TYPE_POWERPC64 => Architecture::PowerPc64,
_ => Architecture::Unknown,
}
}
fn file_range(&self) -> (u64, u64) {
(self.offset().into(), self.size().into())
}
fn data<'data, R: ReadRef<'data>>(&self, file: R) -> Result<&'data [u8]> {
file.read_bytes_at(self.offset().into(), self.size().into())
.read_error("Invalid fat arch offset or size")
}
}
impl FatArch for FatArch32 {
type Word = u32;
fn cputype(&self) -> u32 {
self.cputype.get(BigEndian)
}
fn cpusubtype(&self) -> u32 {
self.cpusubtype.get(BigEndian)
}
fn offset(&self) -> Self::Word {
self.offset.get(BigEndian)
}
fn size(&self) -> Self::Word {
self.size.get(BigEndian)
}
fn align(&self) -> u32 {
self.align.get(BigEndian)
}
}
impl FatArch for FatArch64 {
type Word = u64;
fn cputype(&self) -> u32 {
self.cputype.get(BigEndian)
}
fn cpusubtype(&self) -> u32 {
self.cpusubtype.get(BigEndian)
}
fn offset(&self) -> Self::Word {
self.offset.get(BigEndian)
}
fn size(&self) -> Self::Word {
self.size.get(BigEndian)
}
fn align(&self) -> u32 {
self.align.get(BigEndian)
}
}