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use std::io;
use std::marker;
use std::mem;
use std::slice;
use crate::util::Binding;
use crate::{raw, Error, Object, Oid};
/// A structure to represent a git [blob][1]
///
/// [1]: http://git-scm.com/book/en/Git-Internals-Git-Objects
pub struct Blob<'repo> {
raw: *mut raw::git_blob,
_marker: marker::PhantomData<Object<'repo>>,
}
impl<'repo> Blob<'repo> {
/// Get the id (SHA1) of a repository blob
pub fn id(&self) -> Oid {
unsafe { Binding::from_raw(raw::git_blob_id(&*self.raw)) }
}
/// Determine if the blob content is most certainly binary or not.
pub fn is_binary(&self) -> bool {
unsafe { raw::git_blob_is_binary(&*self.raw) == 1 }
}
/// Get the content of this blob.
pub fn content(&self) -> &[u8] {
unsafe {
let data = raw::git_blob_rawcontent(&*self.raw) as *const u8;
let len = raw::git_blob_rawsize(&*self.raw) as usize;
slice::from_raw_parts(data, len)
}
}
/// Get the size in bytes of the contents of this blob.
pub fn size(&self) -> usize {
unsafe { raw::git_blob_rawsize(&*self.raw) as usize }
}
/// Casts this Blob to be usable as an `Object`
pub fn as_object(&self) -> &Object<'repo> {
unsafe { &*(self as *const _ as *const Object<'repo>) }
}
/// Consumes Blob to be returned as an `Object`
pub fn into_object(self) -> Object<'repo> {
assert_eq!(mem::size_of_val(&self), mem::size_of::<Object<'_>>());
unsafe { mem::transmute(self) }
}
}
impl<'repo> Binding for Blob<'repo> {
type Raw = *mut raw::git_blob;
unsafe fn from_raw(raw: *mut raw::git_blob) -> Blob<'repo> {
Blob {
raw,
_marker: marker::PhantomData,
}
}
fn raw(&self) -> *mut raw::git_blob {
self.raw
}
}
impl<'repo> std::fmt::Debug for Blob<'repo> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
f.debug_struct("Blob").field("id", &self.id()).finish()
}
}
impl<'repo> Clone for Blob<'repo> {
fn clone(&self) -> Self {
self.as_object().clone().into_blob().ok().unwrap()
}
}
impl<'repo> Drop for Blob<'repo> {
fn drop(&mut self) {
unsafe { raw::git_blob_free(self.raw) }
}
}
/// A structure to represent a git writestream for blobs
pub struct BlobWriter<'repo> {
raw: *mut raw::git_writestream,
need_cleanup: bool,
_marker: marker::PhantomData<Object<'repo>>,
}
impl<'repo> BlobWriter<'repo> {
/// Finalize blob writing stream and write the blob to the object db
pub fn commit(mut self) -> Result<Oid, Error> {
// After commit we already doesn't need cleanup on drop
self.need_cleanup = false;
let mut raw = raw::git_oid {
id: [0; raw::GIT_OID_RAWSZ],
};
unsafe {
try_call!(raw::git_blob_create_fromstream_commit(&mut raw, self.raw));
Ok(Binding::from_raw(&raw as *const _))
}
}
}
impl<'repo> Binding for BlobWriter<'repo> {
type Raw = *mut raw::git_writestream;
unsafe fn from_raw(raw: *mut raw::git_writestream) -> BlobWriter<'repo> {
BlobWriter {
raw,
need_cleanup: true,
_marker: marker::PhantomData,
}
}
fn raw(&self) -> *mut raw::git_writestream {
self.raw
}
}
impl<'repo> Drop for BlobWriter<'repo> {
fn drop(&mut self) {
// We need cleanup in case the stream has not been committed
if self.need_cleanup {
unsafe {
if let Some(f) = (*self.raw).free {
f(self.raw)
}
}
}
}
}
impl<'repo> io::Write for BlobWriter<'repo> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
unsafe {
if let Some(f) = (*self.raw).write {
let res = f(self.raw, buf.as_ptr() as *const _, buf.len());
if res < 0 {
Err(io::Error::new(io::ErrorKind::Other, "Write error"))
} else {
Ok(buf.len())
}
} else {
Err(io::Error::new(io::ErrorKind::Other, "no write callback"))
}
}
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
#[cfg(test)]
mod tests {
use crate::Repository;
use std::fs::File;
use std::io::prelude::*;
use std::path::Path;
use tempfile::TempDir;
#[test]
fn buffer() {
let td = TempDir::new().unwrap();
let repo = Repository::init(td.path()).unwrap();
let id = repo.blob(&[5, 4, 6]).unwrap();
let blob = repo.find_blob(id).unwrap();
assert_eq!(blob.id(), id);
assert_eq!(blob.size(), 3);
assert_eq!(blob.content(), [5, 4, 6]);
assert!(blob.is_binary());
repo.find_object(id, None).unwrap().as_blob().unwrap();
repo.find_object(id, None)
.unwrap()
.into_blob()
.ok()
.unwrap();
}
#[test]
fn path() {
let td = TempDir::new().unwrap();
let path = td.path().join("foo");
File::create(&path).unwrap().write_all(&[7, 8, 9]).unwrap();
let repo = Repository::init(td.path()).unwrap();
let id = repo.blob_path(&path).unwrap();
let blob = repo.find_blob(id).unwrap();
assert_eq!(blob.content(), [7, 8, 9]);
blob.into_object();
}
#[test]
fn stream() {
let td = TempDir::new().unwrap();
let repo = Repository::init(td.path()).unwrap();
let mut ws = repo.blob_writer(Some(Path::new("foo"))).unwrap();
let wl = ws.write(&[10, 11, 12]).unwrap();
assert_eq!(wl, 3);
let id = ws.commit().unwrap();
let blob = repo.find_blob(id).unwrap();
assert_eq!(blob.content(), [10, 11, 12]);
blob.into_object();
}
}
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