1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
extern crate bindgen;
use bindgen::builder;
use std::fs::{self, File};
use std::io::Write;
use std::path::Path;
use std::str;
fn copy_headers(src_dir: &Path, dst_dir: &Path) -> Result<(), String> {
if dst_dir.is_file() {
fs::remove_file(&dst_dir).or_else(|e| {
Err(format!(
"failed to remove existing file at {:?}: {}",
dst_dir, e
))
})?;
}
if !dst_dir.is_dir() {
fs::create_dir(&dst_dir).or_else(|e| {
Err(format!(
"failed to create destination directory: {:?}: {}",
dst_dir, e
))
})?;
}
let header_files = vec![
"cras_audio_format.h",
"cras_iodev_info.h",
"cras_messages.h",
"cras_shm.h",
"cras_types.h",
"cras_util.h",
];
for header in &header_files {
let src = src_dir.join(&header);
let dst = dst_dir.join(&header);
fs::copy(&src, &dst).or_else(|e| {
Err(format!(
"failed to copy header file {:?} to {:?}: {}",
src, dst, e
))
})?;
}
Ok(())
}
/*
* If we use both `packed` and `align(4)` for a struct, bindgen will generate
* it as an opaque struct.
*
* `cras_server_state` is created from C with `packed` and `aligned(4)` and
* shared through a shared memory area.
*
* Structs with `packed` and `align(4)` have the same memory layout as those
* with `packed` except for some extra alignment bytes at the end.
*
* Therefore, using only `packed` for `cras_server_state` from Rust side is safe.
*
* This function modifies `cras_server_state` from
* `__attribute__ ((packed, aligned(4)))` to `__attribute__ ((packed))`
*/
fn modify_server_state_attributes(dir: &Path) -> Result<(), String> {
let cras_types_path = dir.join("cras_types.h");
let bytes = fs::read(&cras_types_path)
.or_else(|e| Err(format!("failed to read {:?}: {}", cras_types_path, e)))?;
let old = str::from_utf8(&bytes).or_else(|e| {
Err(format!(
"failed to parse {:?} as utf8: {}",
cras_types_path, e
))
})?;
let new = old.replacen(
"struct __attribute__((packed, aligned(4))) cras_server_state {",
"struct __attribute__((packed)) cras_server_state {",
1,
);
if new.len() >= old.len() {
return Err("failed to remove 'aligned(4)' from cras_server_state".to_string());
}
fs::write(&cras_types_path, new).or_else(|e| {
Err(format!(
"failed to write updated contents to {:?}: {}",
cras_types_path, e
))
})?;
Ok(())
}
fn gen() -> String {
let name = "cras_gen";
let bindings = builder()
.header("c_headers/cras_messages.h")
.header("c_headers/cras_types.h")
.header("c_headers/cras_audio_format.h")
.header("c_headers/cras_shm.h")
.whitelist_type("cras_.*")
.whitelist_var("cras_.*")
.whitelist_type("CRAS_.*")
.whitelist_var("CRAS_.*")
.whitelist_type("audio_message")
.rustified_enum("CRAS_.*")
.rustified_enum("_snd_pcm_.*")
.generate()
.expect(format!("Unable to generate {} code", name).as_str());
bindings.to_string()
}
fn write_output(output_path: &Path, output: String) -> std::io::Result<()> {
let header = b"// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/*
* generated from files in cras/src/common in adhd:
* cras_audio_format.h
* cras_iodev_info.h
* cras_messages.h
* cras_shm.h
* cras_types.h
* cras_util.h
*/
";
let mut output_file = File::create(output_path)?;
output_file.write_all(header)?;
output_file.write_all(output.as_bytes())?;
Ok(())
}
fn main() {
let src_header_dir = Path::new("../../../src/common");
let dst_header_dir = Path::new("./c_headers");
copy_headers(src_header_dir, dst_header_dir).expect("failed to copy C headers");
modify_server_state_attributes(dst_header_dir)
.expect("failed to modify cras_server_state's attributes");
let generated_code = gen();
write_output(Path::new("lib_gen.rs"), generated_code).expect("failed to write generated code");
}
|
