gstreamer_sys/
manual.rs

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1use glib_sys::gpointer;
2use std::{fmt, mem};
3
4cfg_if::cfg_if! {
5    if #[cfg(target_pointer_width = "64")] {
6        const GST_ID_STR_PADDING_LEN: usize = 8;
7    } else if #[cfg(target_pointer_width = "32")] {
8        const GST_ID_STR_PADDING_LEN: usize = 12;
9    } else {
10        panic!("Only 32 bit and 64 bit pointers supported currently");
11    }
12}
13
14#[derive(Copy, Clone)]
15#[repr(C)]
16pub struct GstIdStr {
17    // Internal representation is private
18    pointer: gpointer,
19    padding: [u8; GST_ID_STR_PADDING_LEN],
20}
21
22impl fmt::Debug for GstIdStr {
23    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
24        use fmt::Write;
25
26        unsafe {
27            let pointer =
28                &*(&self.pointer as *const *mut _ as *const [u8; mem::size_of::<gpointer>()]);
29
30            let is_pretty = f.alternate();
31
32            f.write_str("GstIdStr(")?;
33            if is_pretty {
34                f.write_str("\n    ")?;
35            }
36
37            f.write_str("ascii: \"")?;
38            for &b in pointer.iter().chain(self.padding.iter()) {
39                match b {
40                    0 => break,
41                    c if c.is_ascii() => f.write_char(char::from(b))?,
42                    _ => f.write_char('�')?,
43                }
44            }
45
46            if is_pretty {
47                f.write_str("\",\n    ")?;
48            } else {
49                f.write_str("\", ")?;
50            }
51
52            f.write_str("hex: ")?;
53            for (i, b) in pointer.iter().chain(self.padding.iter()).enumerate() {
54                if i > 0 {
55                    f.write_char(' ')?;
56                }
57                f.write_fmt(format_args!("{b:02x}"))?;
58            }
59
60            if is_pretty {
61                f.write_str(",\n")?;
62            }
63
64            f.write_char(')')
65        }
66    }
67}
68
69#[cfg(test)]
70mod tests {
71    #[cfg(feature = "v1_26")]
72    #[test]
73    fn gstidstr_debug() {
74        unsafe {
75            use std::{ffi::c_char, mem};
76
77            let mut s = mem::MaybeUninit::uninit();
78            crate::gst_id_str_init(s.as_mut_ptr());
79            let mut s = s.assume_init();
80
81            crate::gst_id_str_set(&mut s as *mut _, b"short\0" as *const u8 as *const c_char);
82            assert_eq!(
83                format!("{s:?}"),
84                r#"GstIdStr(ascii: "short", hex: 73 68 6f 72 74 00 00 00 00 00 00 00 00 00 00 00)"#,
85            );
86            assert_eq!(
87                format!("{s:#?}"),
88                r#"GstIdStr(
89    ascii: "short",
90    hex: 73 68 6f 72 74 00 00 00 00 00 00 00 00 00 00 00,
91)"#
92            );
93
94            crate::gst_id_str_set(
95                &mut s as *mut _,
96                b"utf8\xc3\xa7\0" as *const u8 as *const c_char,
97            );
98            assert_eq!(
99                format!("{s:?}"),
100                r#"GstIdStr(ascii: "utf8��", hex: 75 74 66 38 c3 a7 00 00 00 00 00 00 00 00 00 00)"#,
101            );
102            assert_eq!(
103                format!("{s:#?}"),
104                r#"GstIdStr(
105    ascii: "utf8��",
106    hex: 75 74 66 38 c3 a7 00 00 00 00 00 00 00 00 00 00,
107)"#
108            );
109        }
110    }
111}
gstreamer_sys/manual.rs

gstreamer_sys/
manual.rs
