mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-12-23 04:26:27 +00:00
56cc260a5c
Initial effort to reduce or eliminate the use of assertions in the production code (i.e. not test code). See issue 43 for an example of how this can cause an application (thread) to panic when reading an unusual file. Not all of the changes were as simple as returning an Err, since some functions did not return a Result. Also, the error type used (InvalidData) is just a catch-all with a message, and in some cases a more refined error type may be in order. cargo test passes
128 lines
3.3 KiB
Rust
128 lines
3.3 KiB
Rust
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
|
|
use std::io::{Read, Seek, Write};
|
|
use serde::{Serialize};
|
|
|
|
use crate::mp4box::*;
|
|
|
|
#[derive(Debug, Clone, PartialEq, Default, Serialize)]
|
|
pub struct HdlrBox {
|
|
pub version: u8,
|
|
pub flags: u32,
|
|
pub handler_type: FourCC,
|
|
pub name: String,
|
|
}
|
|
|
|
impl HdlrBox {
|
|
pub fn get_type(&self) -> BoxType {
|
|
BoxType::HdlrBox
|
|
}
|
|
|
|
pub fn get_size(&self) -> u64 {
|
|
HEADER_SIZE + HEADER_EXT_SIZE + 20 + self.name.len() as u64 + 1
|
|
}
|
|
}
|
|
|
|
impl Mp4Box for HdlrBox {
|
|
fn box_type(&self) -> BoxType {
|
|
return self.get_type();
|
|
}
|
|
|
|
fn box_size(&self) -> u64 {
|
|
return self.get_size();
|
|
}
|
|
|
|
fn to_json(&self) -> Result<String> {
|
|
Ok(serde_json::to_string(&self).unwrap())
|
|
}
|
|
|
|
fn summary(&self) -> Result<String> {
|
|
let s = format!("handler_type={} name={}", self.handler_type.to_string(), self.name);
|
|
Ok(s)
|
|
}
|
|
}
|
|
|
|
impl<R: Read + Seek> ReadBox<&mut R> for HdlrBox {
|
|
fn read_box(reader: &mut R, size: u64) -> Result<Self> {
|
|
let start = box_start(reader)?;
|
|
|
|
let (version, flags) = read_box_header_ext(reader)?;
|
|
|
|
reader.read_u32::<BigEndian>()?; // pre-defined
|
|
let handler = reader.read_u32::<BigEndian>()?;
|
|
|
|
skip_bytes(reader, 12)?; // reserved
|
|
|
|
let buf_size = size - HEADER_SIZE - HEADER_EXT_SIZE - 20 - 1;
|
|
let mut buf = vec![0u8; buf_size as usize];
|
|
reader.read_exact(&mut buf)?;
|
|
|
|
let handler_string = match String::from_utf8(buf) {
|
|
Ok(t) => {
|
|
if t.len() != buf_size as usize {
|
|
return Err(Error::InvalidData("string too small"))
|
|
}
|
|
t
|
|
}
|
|
_ => String::from("null"),
|
|
};
|
|
|
|
skip_bytes_to(reader, start + size)?;
|
|
|
|
Ok(HdlrBox {
|
|
version,
|
|
flags,
|
|
handler_type: From::from(handler),
|
|
name: handler_string,
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<W: Write> WriteBox<&mut W> for HdlrBox {
|
|
fn write_box(&self, writer: &mut W) -> Result<u64> {
|
|
let size = self.box_size();
|
|
BoxHeader::new(self.box_type(), size).write(writer)?;
|
|
|
|
write_box_header_ext(writer, self.version, self.flags)?;
|
|
|
|
writer.write_u32::<BigEndian>(0)?; // pre-defined
|
|
writer.write_u32::<BigEndian>((&self.handler_type).into())?;
|
|
|
|
// 12 bytes reserved
|
|
for _ in 0..3 {
|
|
writer.write_u32::<BigEndian>(0)?;
|
|
}
|
|
|
|
writer.write(self.name.as_bytes())?;
|
|
writer.write_u8(0)?;
|
|
|
|
Ok(size)
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use crate::mp4box::BoxHeader;
|
|
use std::io::Cursor;
|
|
|
|
#[test]
|
|
fn test_hdlr() {
|
|
let src_box = HdlrBox {
|
|
version: 0,
|
|
flags: 0,
|
|
handler_type: str::parse::<FourCC>("vide").unwrap(),
|
|
name: String::from("VideoHandler"),
|
|
};
|
|
let mut buf = Vec::new();
|
|
src_box.write_box(&mut buf).unwrap();
|
|
assert_eq!(buf.len(), src_box.box_size() as usize);
|
|
|
|
let mut reader = Cursor::new(&buf);
|
|
let header = BoxHeader::read(&mut reader).unwrap();
|
|
assert_eq!(header.name, BoxType::HdlrBox);
|
|
assert_eq!(src_box.box_size(), header.size);
|
|
|
|
let dst_box = HdlrBox::read_box(&mut reader, header.size).unwrap();
|
|
assert_eq!(src_box, dst_box);
|
|
}
|
|
}
|