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use std::fmt;
use std::cmp::Ordering;
use std::hash::{Hasher, Hash};
use std::str;
use std::path::Path;
use libc;
use {raw, Error, ObjectType, IntoCString};
use util::Binding;
#[derive(Copy, Clone)]
pub struct Oid {
raw: raw::git_oid
}
impl Oid {
pub fn from_str(s: &str) -> Result<Oid, Error> {
::init();
let mut raw = raw::git_oid { id: [0; raw::GIT_OID_RAWSZ] };
unsafe {
try_call!(raw::git_oid_fromstrn(&mut raw,
s.as_bytes().as_ptr()
as *const libc::c_char,
s.len() as libc::size_t));
}
Ok(Oid { raw: raw })
}
pub fn from_bytes(bytes: &[u8]) -> Result<Oid, Error> {
::init();
let mut raw = raw::git_oid { id: [0; raw::GIT_OID_RAWSZ] };
if bytes.len() != raw::GIT_OID_RAWSZ {
Err(Error::from_str("raw byte array must be 20 bytes"))
} else {
unsafe { raw::git_oid_fromraw(&mut raw, bytes.as_ptr()) }
Ok(Oid { raw: raw })
}
}
pub fn zero() -> Oid {
let out = raw::git_oid { id: [0; raw::GIT_OID_RAWSZ] };
Oid { raw: out }
}
pub fn hash_object(kind: ObjectType, bytes: &[u8]) -> Result<Oid, Error> {
::init();
let mut out = raw::git_oid { id: [0; raw::GIT_OID_RAWSZ] };
unsafe {
try_call!(raw::git_odb_hash(&mut out,
bytes.as_ptr()
as *const libc::c_void,
bytes.len(),
kind.raw()));
}
Ok(Oid { raw: out })
}
pub fn hash_file<P: AsRef<Path>>(kind: ObjectType, path: P) -> Result<Oid, Error> {
::init();
let rpath = try!(path.as_ref().into_c_string());
let mut out = raw::git_oid { id: [0; raw::GIT_OID_RAWSZ] };
unsafe {
try_call!(raw::git_odb_hashfile(&mut out,
rpath,
kind.raw()));
}
Ok(Oid { raw: out })
}
pub fn as_bytes(&self) -> &[u8] { &self.raw.id }
pub fn is_zero(&self) -> bool {
unsafe { raw::git_oid_iszero(&self.raw) == 1 }
}
}
impl Binding for Oid {
type Raw = *const raw::git_oid;
unsafe fn from_raw(oid: *const raw::git_oid) -> Oid {
Oid { raw: *oid }
}
fn raw(&self) -> *const raw::git_oid { &self.raw as *const _ }
}
impl fmt::Debug for Oid {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
fmt::Display::fmt(self, f)
}
}
impl fmt::Display for Oid {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut dst = [0u8; raw::GIT_OID_HEXSZ + 1];
unsafe {
raw::git_oid_tostr(dst.as_mut_ptr() as *mut libc::c_char,
dst.len() as libc::size_t, &self.raw);
}
let s = &dst[..dst.iter().position(|&a| a == 0).unwrap()];
str::from_utf8(s).unwrap().fmt(f)
}
}
impl str::FromStr for Oid {
type Err = Error;
fn from_str(s: &str) -> Result<Oid, Error> {
Oid::from_str(s)
}
}
impl PartialEq for Oid {
fn eq(&self, other: &Oid) -> bool {
unsafe { raw::git_oid_equal(&self.raw, &other.raw) != 0 }
}
}
impl Eq for Oid {}
impl PartialOrd for Oid {
fn partial_cmp(&self, other: &Oid) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for Oid {
fn cmp(&self, other: &Oid) -> Ordering {
match unsafe { raw::git_oid_cmp(&self.raw, &other.raw) } {
0 => Ordering::Equal,
n if n < 0 => Ordering::Less,
_ => Ordering::Greater,
}
}
}
impl Hash for Oid {
fn hash<H: Hasher>(&self, into: &mut H) {
self.raw.id.hash(into)
}
}
impl AsRef<[u8]> for Oid {
fn as_ref(&self) -> &[u8] { self.as_bytes() }
}
#[cfg(test)]
mod tests {
use std::io::prelude::*;
use std::fs::File;
use tempdir::TempDir;
use {ObjectType};
use super::Oid;
#[test]
fn conversions() {
assert!(Oid::from_str("foo").is_err());
assert!(Oid::from_str("decbf2be529ab6557d5429922251e5ee36519817").is_ok());
assert!(Oid::from_bytes(b"foo").is_err());
assert!(Oid::from_bytes(b"00000000000000000000").is_ok());
}
#[test]
fn zero_is_zero() {
assert!(Oid::zero().is_zero());
}
#[test]
fn hash_object() {
let bytes = "Hello".as_bytes();
assert!(Oid::hash_object(ObjectType::Blob, bytes).is_ok());
}
#[test]
fn hash_file() {
let td = TempDir::new("test").unwrap();
let path = td.path().join("hello.txt");
let mut file = File::create(&path).unwrap();
file.write_all("Hello".as_bytes()).unwrap();
assert!(Oid::hash_file(ObjectType::Blob, &path).is_ok());
}
}