1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
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: 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: 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 { ((*self.raw).free)(self.raw) }
        }
    }
}

impl<'repo> io::Write for BlobWriter<'repo> {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        unsafe {
            let res = ((*self.raw).write)(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())
            }
        }
    }
    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();
    }
}