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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use libc::size_t;
use std::boxed::Box;
use std::convert::TryInto;
use std::error::Error;
use std::ffi::CStr;
use std::{slice, str};
use nserror::{nsresult, NS_ERROR_INVALID_ARG, NS_OK};
use rsdparsa::attribute_type::SdpAttributeSsrc;
#[repr(C)]
#[derive(Clone, Copy)]
pub struct StringView {
buffer: *const u8,
len: size_t,
}
pub const NULL_STRING: StringView = StringView {
buffer: 0 as *const u8,
len: 0,
};
impl<'a> From<&'a str> for StringView {
fn from(input: &str) -> StringView {
StringView {
buffer: input.as_ptr(),
len: input.len(),
}
}
}
impl TryInto<String> for StringView {
type Error = Box<dyn Error>;
fn try_into(self) -> Result<String, Box<dyn Error>> {
// This block must be unsafe as it converts a StringView, most likly provided from the
// C++ code, into a rust String and thus needs to operate with raw pointers.
let string_slice: &[u8];
unsafe {
// Add one to the length as the length passed in the StringView is the length of
// the string and is missing the null terminator
string_slice = slice::from_raw_parts(self.buffer, self.len + 1 as usize);
}
let c_str = match CStr::from_bytes_with_nul(string_slice) {
Ok(string) => string,
Err(x) => {
return Err(Box::new(x));
}
};
let str_slice: &str = match str::from_utf8(c_str.to_bytes()) {
Ok(string) => string,
Err(x) => {
return Err(Box::new(x));
}
};
Ok(str_slice.to_string())
}
}
impl<'a, T: AsRef<str>> From<&'a Option<T>> for StringView {
fn from(input: &Option<T>) -> StringView {
match *input {
Some(ref x) => StringView {
buffer: x.as_ref().as_ptr(),
len: x.as_ref().len(),
},
None => NULL_STRING,
}
}
}
#[no_mangle]
pub unsafe extern "C" fn string_vec_len(vec: *const Vec<String>) -> size_t {
(*vec).len() as size_t
}
#[no_mangle]
pub unsafe extern "C" fn string_vec_get_view(
vec: *const Vec<String>,
index: size_t,
ret: *mut StringView,
) -> nsresult {
match (*vec).get(index) {
Some(ref string) => {
*ret = StringView::from(string.as_str());
NS_OK
}
None => NS_ERROR_INVALID_ARG,
}
}
#[no_mangle]
pub unsafe extern "C" fn free_boxed_string_vec(ptr: *mut Vec<String>) -> nsresult {
drop(Box::from_raw(ptr));
NS_OK
}
#[no_mangle]
pub unsafe extern "C" fn f32_vec_len(vec: *const Vec<f32>) -> size_t {
(*vec).len()
}
#[no_mangle]
pub unsafe extern "C" fn f32_vec_get(
vec: *const Vec<f32>,
index: size_t,
ret: *mut f32,
) -> nsresult {
match (*vec).get(index) {
Some(val) => {
*ret = *val;
NS_OK
}
None => NS_ERROR_INVALID_ARG,
}
}
#[no_mangle]
pub unsafe extern "C" fn u32_vec_len(vec: *const Vec<u32>) -> size_t {
(*vec).len()
}
#[no_mangle]
pub unsafe extern "C" fn u32_vec_get(
vec: *const Vec<u32>,
index: size_t,
ret: *mut u32,
) -> nsresult {
match (*vec).get(index) {
Some(val) => {
*ret = *val;
NS_OK
}
None => NS_ERROR_INVALID_ARG,
}
}
#[no_mangle]
pub unsafe extern "C" fn u16_vec_len(vec: *const Vec<u16>) -> size_t {
(*vec).len()
}
#[no_mangle]
pub unsafe extern "C" fn u16_vec_get(
vec: *const Vec<u16>,
index: size_t,
ret: *mut u16,
) -> nsresult {
match (*vec).get(index) {
Some(val) => {
*ret = *val;
NS_OK
}
None => NS_ERROR_INVALID_ARG,
}
}
#[no_mangle]
pub unsafe extern "C" fn u8_vec_len(vec: *const Vec<u8>) -> size_t {
(*vec).len()
}
#[no_mangle]
pub unsafe extern "C" fn u8_vec_get(vec: *const Vec<u8>, index: size_t, ret: *mut u8) -> nsresult {
match (*vec).get(index) {
Some(val) => {
*ret = *val;
NS_OK
}
None => NS_ERROR_INVALID_ARG,
}
}
#[no_mangle]
pub unsafe extern "C" fn ssrc_vec_len(vec: *const Vec<SdpAttributeSsrc>) -> size_t {
(*vec).len()
}
#[no_mangle]
pub unsafe extern "C" fn ssrc_vec_get_id(
vec: *const Vec<SdpAttributeSsrc>,
index: size_t,
ret: *mut u32,
) -> nsresult {
match (*vec).get(index) {
Some(val) => {
*ret = val.id;
NS_OK
}
None => NS_ERROR_INVALID_ARG,
}
}
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