Struct BlobRangeReader 

pub struct BlobRangeReader { /* private fields */ }

Serves plaintext ranges of one stored blob by fetching only the sealed chunks that cover them. A read costs the chunks it touches and nothing else — never the whole object, however many ranges the stream asks for.

Opening a sealed blob reads its [key tag][header] prefix once, which is what names the key and the chunk size; every later range is arithmetic over that header plus one ranged request per window-worth of chunks. A chunk that opens is authentic — its tag covers its bytes, its index, and the header — so there is nothing else to check and no whole-object pass to amortize.

Implementations

impl BlobRangeReader

pub fn plaintext_size(&self) -> u64

The blob’s whole plaintext length, as its row declares it.

pub async fn read_at( &self, offset: u64, len: u64, ) -> Result<Vec<u8>, StorageError>

Read exactly len plaintext bytes at offset. A range past the blob’s end is an error, never a short read.