DataSource class abstract interface

Random-access byte source — any file, any backing store.

The engine reads arbitrary offsets on demand (xref at end of file, objects scattered throughout). This is NOT a forward-only stream — the engine seeks backward and forward. A one-shot socket or pipe that can only read sequentially cannot be a DataSource. Buffer the full content first, or use a backing store with random access.

Memory is O(1) per read (64KB max per call). The full file is never buffered by the engine — only the backing store holds it.

Implement with your backing store: file (pread), memory (sublistView), HTTP (Range header), IndexedDB, web Blob.slice.

Implementers

• FileSource
• MemorySource

Properties

hashCode → int

The hash code for this object.

no setter, inherited

length → int

Total size in bytes.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

readAt(int offset, int count) → FutureOr<Uint8List>

Read count bytes starting at offset.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited