Enum android_sparse::file::Chunk

pub enum Chunk {
    Raw {
        file: Rc<RefCell<StdFile>>,
        offset: u64,
        num_blocks: u32,
    },
    Fill {
        fill: [u8; 4],
        num_blocks: u32,
    },
    DontCare {
        num_blocks: u32,
    },
    Crc32 {
        crc: u32,
    },
}

A sparse file chunk.

A chunk represents either:

• a part of the raw image of size num_blocks * BLOCK_SIZE, or
• the CRC32 checksum of the raw image data up to this point

Variants

Raw

Chunk representing blocks of raw bytes.

To keep memory usage low, a raw chunk holds a reference to its backing file instead of the actual raw data.

Fields of Raw

file: Rc<RefCell<StdFile>>	Reference to the backing file.
offset: u64	Offset into the backing file to the start of the raw bytes.
num_blocks: u32	Number of blocks contained in this chunk.

Fill

Chunk representing blocks filled with the same 4-byte value.

Fields of Fill

fill: [u8; 4]	The 4-byte fill value.
num_blocks: u32	Number of blocks contained in this chunk.

DontCare

Chunk representing blocks of ignored data.

Fields of DontCare

num_blocks: u32

Number of blocks contained in this chunk.

Crc32

Chunk holding the CRC32 checksum value of all previous data chunks.

Fields of Crc32

crc: u32

The CRC32 checksum value.

Methods

impl Chunk

pub fn sparse_size(&self) -> u32

Returns this chunk's size in a sparse image.

pub fn raw_size(&self) -> u32

Returns the size of this chunk's decoded raw data.

pub fn num_blocks(&self) -> u32

Returns the number of blocks contained in this chunk.

Trait Implementations

impl Debug for Chunk

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.