FileSource class final

A DataSource backed by a file on disk. Native platforms only.

Reads arbitrary offsets via pread-style positioned reads — each call returns only the bytes asked for, so the source holds one chunk at a time, never the whole file. The engine pulls a 7 GB PDF in the same small (≤64KB) bites as a 7 KB one.

import 'package:pdf_manipulator/io.dart';

final doc = await pdf.open(FileSource(File('/path/to/big.pdf')));

Web has no filesystem; this class is exported from package:pdf_manipulator/io.dart (not the main library) so web builds never pull in dart:io. On web, back the source with a Blob instead.

Implemented types

• DataSource

Constructors

FileSource(File _file)

Wraps file. Its length is read synchronously at construction; the file must exist and not be truncated while operations are reading it.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

length → int

Total size in bytes.

final

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) → Future<Uint8List>

Read count bytes starting at offset.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited