Enum Chunk 

pub enum Chunk {
    Raw {
        start: u64,
        size: u64,
    },
    Fill {
        start: u64,
        size: u64,
        value: u32,
    },
    DontCare {
        start: u64,
        size: u64,
    },
    Crc32 {
        checksum: u32,
    },
}

Variants

Raw

Raw represents a set of blocks to be written to disk as-is. start is the offset in the expanded image at which the Raw section starts. start and size are in bytes, but must be block-aligned.

Fields

start: u64

size: u64

Fill

Fill represents a Chunk that has the value repeated enough to fill size bytes. start is the offset in the expanded image at which the Fill section starts. start and size are in bytes, but must be block-aligned.

Fields

start: u64

size: u64

value: u32

DontCare

DontCare represents a set of blocks that need to be “offset” by the image recipient. If an image needs to be broken up into two sparse images, and we flash n bytes for Sparse Image 1, Sparse Image 2 needs to start with a DontCareChunk with (n/blocksize) blocks as its “size” property. start is the offset in the expanded image at which the DontCare section starts. start and size are in bytes, but must be block-aligned.

Fields

start: u64

size: u64

Crc32

Crc32Chunk is used as a checksum of a given set of Chunks for a SparseImage. This is not required and unused in most implementations of the Sparse Image format. The type is included for completeness. It has 4 bytes of CRC32 checksum as describable in a u32.

Fields

checksum: u32

Implementations

impl Chunk

pub fn read_metadata<R: Read>( reader: &mut R, offset: u64, block_size: u32, ) -> Result<Self>

Attempts to read a Chunk from reader. The reader will be positioned at the first byte following the chunk header and any extra data; for a Raw chunk this means it will point at the data payload, and for other chunks it will point at the next chunk header (or EOF). offset is the current offset in the logical volume.

Trait Implementations

impl Clone for Chunk

fn clone(&self) -> Chunk

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Chunk

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

Formats the value using the given formatter.

impl Display for Chunk

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

Formats the value using the given formatter.

impl PartialEq for Chunk

fn eq(&self, other: &Chunk) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Chunk