cn_font_utils/
lib.rs

1/// 计算给定的 `Vec<u8>` 在千字节（KB）中的大小。
2pub fn u8_size_in_kb(vec: &Vec<u8>) -> f64 {
3    let size_in_bytes = vec.len();
4    let size_in_kb = size_in_bytes as f64 / 1024.0;
5    size_in_kb
6}
7
8/// 将 `Vec<u32>` 转换为 `String`，每个 `u32` 值被视为一个 Unicode 代码点。
9pub fn vec_u32_to_string(vec: &Vec<u32>) -> String {
10    let chars: Vec<char> = vec
11        .iter()
12        .map(|u| std::char::from_u32(u.clone()).unwrap_or(' '))
13        .collect();
14    chars.into_iter().collect()
15}
16
17/// 读取指定路径的完成二进制文件，并返回 Vec<u8>。
18pub fn read_binary_file(file_path: &str) -> std::io::Result<Vec<u8>> {
19    use std::io::Read;
20    let mut file = std::fs::File::open(file_path)?;
21    let mut buffer = Vec::new();
22    file.read_to_end(&mut buffer)?;
23    Ok(buffer)
24}
25
26// 将 Vec<u32> 转换为 Vec<u8>
27pub fn u32_array_to_u8_array(input: &[u32]) -> Vec<u8> {
28    let mut output = Vec::with_capacity(input.len() * 4);
29    for &num in input {
30        output.push(num as u8);
31        output.push((num >> 8) as u8);
32        output.push((num >> 16) as u8);
33        output.push((num >> 24) as u8);
34    }
35    output
36}
37
38// 将 Vec<u8> 转换为 Vec<u32>
39pub fn u8_array_to_u32_array(arr: &[u8]) -> Vec<u32> {
40    assert!(arr.len() % 4 == 0, "File length is not a multiple of 4");
41    arr.chunks(4)
42        .map(|chunk| {
43            u32::from_be_bytes([chunk[3], chunk[2], chunk[1], chunk[0]])
44        })
45        .collect()
46}
47// 将 Vec<u8> 转换为 Vec<u16>
48pub fn u8_array_to_u16_array(arr: &[u8]) -> Vec<u16> {
49    assert!(arr.len() % 2 == 0, "Array length is not a multiple of 2");
50    arr.chunks(2)
51        .map(|chunk| u16::from_be_bytes([chunk[1], chunk[0]]))
52        .collect()
53}
54/// 输出一个文件，会自动创建文件夹
55pub fn output_file(file_path: &str, buffer: &Vec<u8>) -> std::io::Result<()> {
56    use std::fs::File;
57    use std::io::Write;
58    use std::path::Path;
59    let path = Path::new(file_path);
60
61    if let Some(parent) = path.parent() {
62        std::fs::create_dir_all(parent)?;
63    }
64    let mut file = File::create(path)?;
65    file.write_all(buffer)?;
66    Ok(())
67}
68
69// 直接获取切片字符串，类似于 slice 方法
70pub fn slice_string(s: &str, start: isize, end: isize) -> String {
71    let len = s.chars().count() as isize;
72    let start = if start < 0 { len + start } else { start } as usize;
73    let end = if end < 0 { len + end } else { end } as usize;
74
75    // Ensure indices are within bounds and start <= end
76    let start = start.min(len as usize).max(0);
77    let end = end.min(len as usize).max(start);
78
79    s.chars().skip(start).take(end - start).collect()
80}
81
82#[test]
83fn test_slice() {
84    let text = "Hello, world!";
85    assert_eq!("ello, worl", slice_string(text, 1, -2)); // Should print "ello, world"
86}
87
88#[cfg(test)]
89mod tests {
90    use super::*;
91
92    #[test]
93    fn test_u8_size_in_kb() {
94        let vec = vec![0; 2048]; // 2048 bytes
95        assert_eq!(u8_size_in_kb(&vec), 2.0);
96    }
97
98    #[test]
99    fn test_vec_u32_to_string() {
100        let vec = vec![72, 101, 108, 108, 111]; // "Hello"
101        assert_eq!(vec_u32_to_string(&vec), "Hello");
102
103        let vec_with_invalid = vec![72, 101, 108, 108, 111, 0x110000]; // "Hello "
104        assert_eq!(vec_u32_to_string(&vec_with_invalid), "Hello ");
105    }
106
107    #[test]
108    fn test_read_binary_file() {
109        use std::io::Write;
110        let file_path = "test.bin";
111        let data = vec![1, 2, 3, 4, 5];
112
113        // 创建一个测试文件
114        {
115            let mut file = std::fs::File::create(file_path).unwrap();
116            file.write_all(&data).unwrap();
117        }
118
119        // 读取文件并验证内容
120        let result = read_binary_file(file_path).unwrap();
121        assert_eq!(result, data);
122
123        // 删除测试文件
124        std::fs::remove_file(file_path).unwrap();
125    }
126
127    #[test]
128    fn test_u32_array_to_u8_array() {
129        let input = vec![0x12345678, 0x90abcdef];
130        let expected_output =
131            vec![0x78, 0x56, 0x34, 0x12, 0xef, 0xcd, 0xab, 0x90];
132        let output = u32_array_to_u8_array(&input);
133        assert_eq!(output, expected_output);
134    }
135
136    #[test]
137    fn test_u8_array_to_u32_array() {
138        let input = vec![0x78, 0x56, 0x34, 0x12, 0xef, 0xcd, 0xab, 0x90];
139        let expected_output = vec![0x12345678, 0x90abcdef];
140        let output = u8_array_to_u32_array(&input);
141        assert_eq!(output, expected_output);
142    }
143
144    #[test]
145    fn test_round_trip_conversion() {
146        let input = vec![0x12345678, 0x90abcdef, 0xdeadbeef];
147        let u8_array = u32_array_to_u8_array(&input);
148        let output = u8_array_to_u32_array(&u8_array);
149        assert_eq!(input, output);
150    }
151}
cn_font_utils/lib.rs

cn_font_utils/
lib.rs
