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https://github.com/alfg/mp4-rust.git
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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
230 lines
6.5 KiB
Rust
230 lines
6.5 KiB
Rust
use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
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use std::char::{decode_utf16, REPLACEMENT_CHARACTER};
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use std::io::{Read, Seek, Write};
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use serde::{Serialize};
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use crate::mp4box::*;
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#[derive(Debug, Clone, PartialEq, Serialize)]
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pub struct MdhdBox {
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pub version: u8,
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pub flags: u32,
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pub creation_time: u64,
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pub modification_time: u64,
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pub timescale: u32,
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pub duration: u64,
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pub language: String,
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}
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impl MdhdBox {
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pub fn get_type(&self) -> BoxType {
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BoxType::MdhdBox
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}
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pub fn get_size(&self) -> u64 {
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let mut size = HEADER_SIZE + HEADER_EXT_SIZE;
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if self.version == 1 {
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size += 28;
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} else if self.version == 0 {
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size += 16;
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}
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size += 4;
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size
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}
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}
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impl Default for MdhdBox {
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fn default() -> Self {
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MdhdBox {
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version: 0,
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flags: 0,
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creation_time: 0,
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modification_time: 0,
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timescale: 1000,
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duration: 0,
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language: String::from("und"),
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}
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}
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}
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impl Mp4Box for MdhdBox {
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fn box_type(&self) -> BoxType {
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return self.get_type();
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}
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fn box_size(&self) -> u64 {
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return self.get_size();
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}
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fn to_json(&self) -> Result<String> {
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Ok(serde_json::to_string(&self).unwrap())
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}
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fn summary(&self) -> Result<String> {
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let s = format!("creation_time={} timescale={} duration={} language={}",
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self.creation_time, self.timescale, self.duration, self.language);
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Ok(s)
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}
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}
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impl<R: Read + Seek> ReadBox<&mut R> for MdhdBox {
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fn read_box(reader: &mut R, size: u64) -> Result<Self> {
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let start = box_start(reader)?;
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let (version, flags) = read_box_header_ext(reader)?;
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let (creation_time, modification_time, timescale, duration) = if version == 1 {
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(
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reader.read_u64::<BigEndian>()?,
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reader.read_u64::<BigEndian>()?,
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reader.read_u32::<BigEndian>()?,
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reader.read_u64::<BigEndian>()?,
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)
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} else if version == 0 {
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(
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reader.read_u32::<BigEndian>()? as u64,
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reader.read_u32::<BigEndian>()? as u64,
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reader.read_u32::<BigEndian>()?,
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reader.read_u32::<BigEndian>()? as u64,
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)
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} else {
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return Err(Error::InvalidData("version must be 0 or 1"));
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};
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let language_code = reader.read_u16::<BigEndian>()?;
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let language = language_string(language_code);
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skip_bytes_to(reader, start + size)?;
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Ok(MdhdBox {
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version,
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flags,
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creation_time,
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modification_time,
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timescale,
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duration,
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language,
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})
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}
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}
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impl<W: Write> WriteBox<&mut W> for MdhdBox {
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fn write_box(&self, writer: &mut W) -> Result<u64> {
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let size = self.box_size();
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BoxHeader::new(self.box_type(), size).write(writer)?;
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write_box_header_ext(writer, self.version, self.flags)?;
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if self.version == 1 {
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writer.write_u64::<BigEndian>(self.creation_time)?;
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writer.write_u64::<BigEndian>(self.modification_time)?;
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writer.write_u32::<BigEndian>(self.timescale)?;
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writer.write_u64::<BigEndian>(self.duration)?;
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} else if self.version == 0 {
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writer.write_u32::<BigEndian>(self.creation_time as u32)?;
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writer.write_u32::<BigEndian>(self.modification_time as u32)?;
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writer.write_u32::<BigEndian>(self.timescale)?;
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writer.write_u32::<BigEndian>(self.duration as u32)?;
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} else {
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return Err(Error::InvalidData("version must be 0 or 1"));
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}
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let language_code = language_code(&self.language);
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writer.write_u16::<BigEndian>(language_code)?;
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writer.write_u16::<BigEndian>(0)?; // pre-defined
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Ok(size)
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}
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}
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fn language_string(language: u16) -> String {
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let mut lang: [u16; 3] = [0; 3];
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lang[0] = ((language >> 10) & 0x1F) + 0x60;
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lang[1] = ((language >> 5) & 0x1F) + 0x60;
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lang[2] = ((language) & 0x1F) + 0x60;
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// Decode utf-16 encoded bytes into a string.
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let lang_str = decode_utf16(lang.iter().cloned())
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.map(|r| r.unwrap_or(REPLACEMENT_CHARACTER))
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.collect::<String>();
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return lang_str;
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}
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fn language_code(language: &str) -> u16 {
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let mut lang = language.encode_utf16();
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let mut code = (lang.next().unwrap_or(0) & 0x1F) << 10;
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code += (lang.next().unwrap_or(0) & 0x1F) << 5;
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code += lang.next().unwrap_or(0) & 0x1F;
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code
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::mp4box::BoxHeader;
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use std::io::Cursor;
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fn test_language_code(lang: &str) {
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let code = language_code(lang);
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let lang2 = language_string(code);
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assert_eq!(lang, lang2);
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}
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#[test]
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fn test_language_codes() {
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test_language_code("und");
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test_language_code("eng");
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test_language_code("kor");
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}
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#[test]
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fn test_mdhd32() {
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let src_box = MdhdBox {
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version: 0,
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flags: 0,
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creation_time: 100,
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modification_time: 200,
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timescale: 48000,
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duration: 30439936,
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language: String::from("und"),
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};
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let mut buf = Vec::new();
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src_box.write_box(&mut buf).unwrap();
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assert_eq!(buf.len(), src_box.box_size() as usize);
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let mut reader = Cursor::new(&buf);
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let header = BoxHeader::read(&mut reader).unwrap();
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assert_eq!(header.name, BoxType::MdhdBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = MdhdBox::read_box(&mut reader, header.size).unwrap();
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assert_eq!(src_box, dst_box);
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}
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#[test]
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fn test_mdhd64() {
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let src_box = MdhdBox {
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version: 0,
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flags: 0,
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creation_time: 100,
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modification_time: 200,
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timescale: 48000,
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duration: 30439936,
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language: String::from("eng"),
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};
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let mut buf = Vec::new();
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src_box.write_box(&mut buf).unwrap();
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assert_eq!(buf.len(), src_box.box_size() as usize);
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let mut reader = Cursor::new(&buf);
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let header = BoxHeader::read(&mut reader).unwrap();
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assert_eq!(header.name, BoxType::MdhdBox);
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assert_eq!(src_box.box_size(), header.size);
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let dst_box = MdhdBox::read_box(&mut reader, header.size).unwrap();
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assert_eq!(src_box, dst_box);
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}
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}
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