unipdf/internal/jbig2/reader/streamreader.go

/*
 * This file is subject to the terms and conditions defined in
 * file 'LICENSE.md', which is part of this source code package.
 */

package reader

import (
	"io"
)

// StreamReader is the interface that allows to read bit, bits, byte,
// bytes, integers change and get the stream position, align the bits.
type StreamReader interface {
	io.Reader
	io.ByteReader
	io.Seeker

	// Align resets the bits position of the given reader.
	// It returns how many bits left were skipped.
	Align() byte
	// BitPosition gets the current bit position.
	BitPosition() int
	// Mark marks a position in the stream to be returned to by a subsequent call to 'Reset'.
	Mark()
	// Length returns the length of the total data used by the reader.
	Length() uint64

	// ReadBit reads the next binary value from the current cache.
	// Equivalent of ReadBool method but returns an integer.
	ReadBit() (int, error)
	// ReadBits reads the bits of size 'n' from the reader.
	ReadBits(n byte) (uint64, error)
	// ReadBool reads the next binary value from the current cache.
	ReadBool() (bool, error)
	// ReadUint32 reads the unsigned uint32 from the reader.
	ReadUint32() (uint32, error)

	// Reset returns the stream pointer to its previous position, including the bit offset,
	// at the time of the most recent unmatched call to mark.
	Reset()
	// StreamPosition gets the stream position of the stream reader.
	StreamPosition() int64
}