directxtex/
blob.rs

1use crate::{ffi, Result};
2use core::{ffi::c_void, ptr};
3
4#[derive(Debug)]
5#[repr(C)]
6pub struct Blob {
7    m_buffer: *mut c_void,
8    m_size: usize,
9}
10
11impl Blob {
12    pub fn initialize(&mut self, size: usize) -> Result<()> {
13        unsafe { ffi::DirectXTexFFI_Blob_Initialize(self.into(), size) }.success(())
14    }
15
16    pub fn release(&mut self) {
17        unsafe { ffi::DirectXTexFFI_Blob_Release(self.into()) }
18    }
19
20    #[must_use]
21    pub fn buffer(&self) -> &[u8] {
22        unsafe { ffi::from_raw_ffi_parts(self.m_buffer.cast(), self.m_size) }
23    }
24
25    #[must_use]
26    pub fn buffer_mut(&mut self) -> &[u8] {
27        unsafe { ffi::from_raw_ffi_parts_mut(self.m_buffer.cast(), self.m_size) }
28    }
29
30    /// Reallocate for a new size
31    pub fn resize(&mut self, size: usize) -> Result<()> {
32        unsafe { ffi::DirectXTexFFI_Blob_Resize(self.into(), size) }.success(())
33    }
34
35    /// Shorten size without reallocation
36    pub fn trim(&mut self, size: usize) -> Result<()> {
37        unsafe { ffi::DirectXTexFFI_Blob_Trim(self.into(), size) }.success(())
38    }
39}
40
41impl Default for Blob {
42    fn default() -> Self {
43        Self {
44            m_buffer: ptr::null_mut(),
45            m_size: 0,
46        }
47    }
48}
49
50impl Drop for Blob {
51    fn drop(&mut self) {
52        self.release();
53    }
54}
55
56#[cfg(test)]
57mod tests {
58    use crate::{ffi, Blob};
59    use core::mem;
60
61    #[test]
62    fn verify_layout() {
63        assert_eq!(mem::size_of::<Blob>(), unsafe {
64            ffi::DirectXTexFFI_Blob_Sizeof()
65        });
66        assert_eq!(mem::align_of::<Blob>(), unsafe {
67            ffi::DirectXTexFFI_Blob_Alignof()
68        });
69    }
70
71    #[test]
72    fn verify_api() {
73        let mut blob = Blob::default();
74
75        blob.initialize(256).unwrap();
76        assert_eq!(blob.buffer().len(), 256);
77        assert_eq!(blob.buffer_mut().len(), 256);
78
79        blob.resize(128).unwrap();
80        assert_eq!(blob.buffer().len(), 128);
81
82        blob.trim(64).unwrap();
83        assert_eq!(blob.buffer().len(), 64);
84
85        assert!(blob.trim(128).is_err());
86    }
87}
directxtex/blob.rs

directxtex/
blob.rs
