1 files changed, 187 insertions, 0 deletions
diff --git a/src/api/caca/libcaca.rs b/src/api/caca/libcaca.rs
new file mode 100644
index 0000000..ce2d281
--- /dev/null
+++ b/src/api/caca/libcaca.rs
@@ -0,0 +1,187 @@
+use libc;
+use std::ffi::CStr;
+use std::mem;
+use api::dlopen;
+
+pub type caca_display_t = libc::c_void;
+pub type caca_canvas_t = libc::c_void;
+pub type caca_dither_t = libc::c_void;
+
+pub struct LibCaca {
+    lib: *mut libc::c_void,
+
+    caca_create_display: unsafe extern fn(*mut caca_canvas_t) -> *mut caca_display_t,
+    caca_free_display: unsafe extern fn(*mut caca_display_t) -> libc::c_int,
+    caca_get_canvas: unsafe extern fn(*mut caca_display_t) -> *mut caca_canvas_t,
+    caca_refresh_display: unsafe extern fn(*mut caca_display_t) -> libc::c_int,
+    caca_dither_bitmap: unsafe extern fn(*mut caca_canvas_t, libc::c_int, libc::c_int, libc::c_int,
+                                         libc::c_int, *const caca_dither_t, *const libc::c_void)
+                                         -> libc::c_int,
+    caca_free_dither: unsafe extern fn(*mut caca_dither_t) -> libc::c_int,
+    caca_create_dither: unsafe extern fn(libc::c_int, libc::c_int, libc::c_int, libc::c_int,
+                                         libc::uint32_t, libc::uint32_t, libc::uint32_t,
+                                         libc::uint32_t) -> *mut caca_dither_t,
+    caca_get_canvas_width: unsafe extern fn(*mut caca_canvas_t) -> libc::c_int,
+    caca_get_canvas_height: unsafe extern fn(*mut caca_canvas_t) -> libc::c_int,
+}
+
+#[derive(Debug)]
+pub struct OpenError {
+    reason: String
+}
+
+impl LibCaca {
+    pub fn open() -> Result<LibCaca, OpenError> {
+        let lib = unsafe { dlopen::dlopen(b"libcaca.so.0\0".as_ptr() as *const _,
+                                          dlopen::RTLD_NOW) };
+
+        if lib.is_null() {
+            let cstr = unsafe { CStr::from_ptr(dlopen::dlerror()) };
+            let reason = String::from_utf8(cstr.to_bytes().to_vec()).unwrap();
+            return Err(OpenError { reason: reason });
+        }
+
+        let caca_create_display = match unsafe { dlopen::dlsym(lib,
+                                        b"caca_create_display\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_create_display".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_free_display = match unsafe { dlopen::dlsym(lib,
+                                      b"caca_free_display\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_free_display".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_get_canvas = match unsafe { dlopen::dlsym(lib,
+                                    b"caca_get_canvas\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_get_canvas".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_refresh_display = match unsafe { dlopen::dlsym(lib,
+                                         b"caca_refresh_display\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_refresh_display".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_dither_bitmap = match unsafe { dlopen::dlsym(lib,
+                                       b"caca_dither_bitmap\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_dither_bitmap".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_free_dither = match unsafe { dlopen::dlsym(lib,
+                                     b"caca_free_dither\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_free_dither".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_create_dither = match unsafe { dlopen::dlsym(lib,
+                                       b"caca_create_dither\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_create_dither".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_get_canvas_width = match unsafe { dlopen::dlsym(lib,
+                                          b"caca_get_canvas_width\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_get_canvas_width".to_string()
+            }),
+            ptr => ptr
+        };
+
+        let caca_get_canvas_height = match unsafe { dlopen::dlsym(lib,
+                                           b"caca_get_canvas_height\0".as_ptr() as *const _) }
+        {
+            ptr if ptr.is_null() => return Err(OpenError {
+                reason: "Could not load caca_get_canvas_height".to_string()
+            }),
+            ptr => ptr
+        };
+
+        Ok(LibCaca {
+            lib: lib,
+
+            caca_create_display: unsafe { mem::transmute(caca_create_display) },
+            caca_free_display: unsafe { mem::transmute(caca_free_display) },
+            caca_get_canvas: unsafe { mem::transmute(caca_get_canvas) },
+            caca_refresh_display: unsafe { mem::transmute(caca_refresh_display) },
+            caca_dither_bitmap: unsafe { mem::transmute(caca_dither_bitmap) },
+            caca_free_dither: unsafe { mem::transmute(caca_free_dither) },
+            caca_create_dither: unsafe { mem::transmute(caca_create_dither) },
+            caca_get_canvas_width: unsafe { mem::transmute(caca_get_canvas_width) },
+            caca_get_canvas_height: unsafe { mem::transmute(caca_get_canvas_height) },
+        })
+    }
+
+    pub unsafe fn caca_create_display(&self, cv: *mut caca_canvas_t) -> *mut caca_display_t {
+        (self.caca_create_display)(cv)
+    }
+
+    pub unsafe fn caca_free_display(&self, dp: *mut caca_display_t) -> libc::c_int {
+        (self.caca_free_display)(dp)
+    }
+
+    pub unsafe fn caca_get_canvas(&self, dp: *mut caca_display_t) -> *mut caca_canvas_t {
+        (self.caca_get_canvas)(dp)
+    }
+
+    pub unsafe fn caca_refresh_display(&self, dp: *mut caca_display_t) -> libc::c_int {
+        (self.caca_refresh_display)(dp)
+    }
+
+    pub unsafe fn caca_dither_bitmap(&self, cv: *mut caca_canvas_t, x: libc::c_int, y: libc::c_int,
+                                     w: libc::c_int, h: libc::c_int, d: *const caca_dither_t,
+                                     pixels: *const libc::c_void) -> libc::c_int
+    {
+        (self.caca_dither_bitmap)(cv, x, y, w, h, d, pixels)
+    }
+
+    pub unsafe fn caca_free_dither(&self, d: *mut caca_dither_t) -> libc::c_int {
+        (self.caca_free_dither)(d)
+    }
+
+    pub unsafe fn caca_create_dither(&self, bpp: libc::c_int, w: libc::c_int, h: libc::c_int,
+                                     pitch: libc::c_int, rmask: libc::uint32_t, gmask: libc::uint32_t,
+                                     bmask: libc::uint32_t, amask: libc::uint32_t) -> *mut caca_dither_t
+    {
+        (self.caca_create_dither)(bpp, w, h, pitch, rmask, gmask, bmask, amask)
+    }
+
+    pub unsafe fn caca_get_canvas_width(&self, cv: *mut caca_canvas_t) -> libc::c_int {
+        (self.caca_get_canvas_width)(cv)
+    }
+
+    pub unsafe fn caca_get_canvas_height(&self, cv: *mut caca_canvas_t) -> libc::c_int {
+        (self.caca_get_canvas_height)(cv)
+    }
+}
+
+impl Drop for LibCaca {
+    fn drop(&mut self) {
+        unsafe { dlopen::dlclose(self.lib); }
+    }
+}