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

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 Co64Box {
    pub version: u8,
    pub flags: u32,

    #[serde(skip_serializing)]
    pub entries: Vec<u64>,
}

impl Co64Box {
    pub fn get_type(&self) -> BoxType {
        BoxType::Co64Box
    }

    pub fn get_size(&self) -> u64 {
        HEADER_SIZE + HEADER_EXT_SIZE + 4 + (8 * self.entries.len() as u64)
    }
}

impl Mp4Box for Co64Box {
    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!("entries_count={}", self.entries.len());
        Ok(s)
    }
}

impl<R: Read + Seek> ReadBox<&mut R> for Co64Box {
    fn read_box(reader: &mut R, size: u64) -> Result<Self> {
        let start = box_start(reader)?;

        let (version, flags) = read_box_header_ext(reader)?;

        let entry_count = reader.read_u32::<BigEndian>()?;
        let mut entries = Vec::with_capacity(entry_count as usize);
        for _i in 0..entry_count {
            let chunk_offset = reader.read_u64::<BigEndian>()?;
            entries.push(chunk_offset);
        }

        skip_bytes_to(reader, start + size)?;

        Ok(Co64Box {
            version,
            flags,
            entries,
        })
    }
}

impl<W: Write> WriteBox<&mut W> for Co64Box {
    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>(self.entries.len() as u32)?;
        for chunk_offset in self.entries.iter() {
            writer.write_u64::<BigEndian>(*chunk_offset)?;
        }

        Ok(size)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::mp4box::BoxHeader;
    use std::io::Cursor;

    #[test]
    fn test_co64() {
        let src_box = Co64Box {
            version: 0,
            flags: 0,
            entries: vec![267, 1970, 2535, 2803, 11843, 22223, 33584],
        };
        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::Co64Box);
        assert_eq!(src_box.box_size(), header.size);

        let dst_box = Co64Box::read_box(&mut reader, header.size).unwrap();
        assert_eq!(src_box, dst_box);
    }
}