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gif 0.3.0

GIF de- and encoder
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use std::io::{self, Read};
use std::mem;
use std::ops;
use std::slice;

use libc::{malloc, size_t, c_int, read, close};

use common::Block;
use reader::{Decoded, DecodingError, PLTE_CHANNELS};
use c_api::{GifFileType, SavedImage, ColorMapObject, GifColorType, _Bool,
		   InputFunc
};
use util;

pub trait CInterface {
    fn read_screen_desc(&mut self, &mut GifFileType);
	fn current_image_buffer(&mut self) -> Result<(&[u8], &mut usize), DecodingError>;
    //fn seek_to(&mut self, position: Progress) -> Result<(), DecodingError>;
    fn last_ext(&self) -> (u8, &[u8], bool);
    fn next_record_type(&mut self) -> Result<Block, DecodingError>;
    fn decode_next(&mut self) -> Result<Option<Decoded>, DecodingError>;
    //unsafe fn read_to_end(&mut self, &mut GifFileType) -> Result<(), DecodingError>;
}

pub unsafe fn saved_images_new(count: usize) -> *mut SavedImage {
	mem::transmute::<_, *mut SavedImage>(malloc(
		(mem::size_of::<SavedImage>() *  count) as size_t
	))
}

pub unsafe fn copy_data(buf: &[u8]) -> *mut u8 {
	let data = mem::transmute::<_, *mut u8>(malloc(
		(mem::size_of::<SavedImage>() *  buf.len()) as size_t
	));
	util::copy_memory(buf, slice::from_raw_parts_mut(data, buf.len()));
	//for (i, &b) in buf.iter().enumerate() {
	//	*data.offset(i as isize) = b
	//}
	data
}

pub unsafe fn copy_colormap(map: &Option<Vec<u8>>) -> *mut ColorMapObject {
	let map: &[u8] = match *map {
		Some(ref map) => &*map,
		None => &[]
	};
	let new_map = mem::transmute::<_, *mut ColorMapObject>(malloc(mem::size_of::<ColorMapObject>() as size_t));
	(*new_map).ColorCount = (map.len()/PLTE_CHANNELS) as c_int;
	(*new_map).BitsPerPixel = 8;
	(*new_map).SortFlag = _Bool::False;
	let colors = mem::transmute::<_, *mut GifColorType>(malloc(
		(mem::size_of::<GifColorType>() *  (*new_map).ColorCount as usize) as size_t
	));
	for (i, c) in map.chunks(PLTE_CHANNELS).enumerate() {
		*colors.offset(i as isize) = GifColorType {
			Red: c[0],
			Green: c[1],
			Blue: c[2],
		}
	}
	(*new_map).Colors = colors;
	new_map
}

/// A simple wrapper around a C file handle
pub struct CFile {
	fp: c_int
}

impl CFile {
	pub fn new(fp: c_int) -> CFile {
		CFile {
			fp: fp
		}
	}
}

impl Read for CFile {
	fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
		let count = unsafe { read(
			self.fp,
			mem::transmute(buf.as_mut_ptr()),
			buf.len() as size_t
		) };
		match count {
			-1 => Err(io::Error::last_os_error()),
			n => Ok(n as usize)
		}
	}
}

impl ops::Drop for CFile {
	fn drop(&mut self) {
		unsafe {close(self.fp)};
	}
}

/// A wrapper around `InputFunc`
pub struct FnInputFile {
	func: InputFunc,
	file: *mut GifFileType
}

impl FnInputFile {
	pub fn new(func: InputFunc, file: *mut GifFileType) -> FnInputFile {
		FnInputFile {
			func: func,
			file: file
		}
	}
}

impl Read for FnInputFile {
	fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
		let count = unsafe { (self.func)(
			self.file,
			mem::transmute(buf.as_mut_ptr()),
			buf.len() as c_int
		) };
		match count {
			-1 => Err(io::Error::from_raw_os_error(count)),
			n => Ok(n as usize)
		}
	}
}