exif 0.0.1

Rust wrapper for libexif
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use libc::c_uint;
use exif_sys::*;

use data::Data;
use internal::*;

pub struct Loader {
    inner: *mut ExifLoader,
}

impl Drop for Loader {
    fn drop(&mut self) {
        unsafe {
            exif_loader_unref(self.inner);
        }
    }
}

impl Loader {
    pub fn new() -> Self {
        let ptr = unsafe { exif_loader_new() };

        assert!(!ptr.is_null());

        Loader { inner: ptr }
    }

    pub fn data(&self) -> Option<Data> {
        let ptr = unsafe { exif_loader_get_data(self.inner) };

        if !ptr.is_null() {
            Some(Data::from_libexif(ptr))
        }
        else {
            None
        }
    }

    pub fn write_data(&mut self, data: &[u8]) -> bool {
        unsafe {
            exif_loader_write(self.inner,
                              data.as_ptr(),
                              data.len() as c_uint) != 0
        }
    }
}