ndb

Documentation

Overview

Package ndb provides support for read-only access to an RPM "ndb" database.

The support for ndb's native indexes is probably unneeded, but is implemented for completeness.

Index

• func CheckMagic(ctx context.Context, r io.Reader) bool
• type Index
  • func (i *Index) Lookup(s string) (pg []IndexPair, err error)
  • func (i *Index) Parse(r io.ReaderAt) error
  • func (i *Index) UnmarshalBinary(b []byte) error
• type IndexPair
• type PackageDB
  • func (db *PackageDB) AllHeaders(_ context.Context) ([]io.ReaderAt, error)
  • func (db *PackageDB) GetHeader(pkgID uint32) (io.ReaderAt, error)
  • func (db *PackageDB) Parse(r io.ReaderAt) error
  • func (h *PackageDB) UnmarshalBinary(b []byte) error
• type XDB
  • func (db *XDB) Index(tag rpm.Tag) (*Index, error)
  • func (db *XDB) Parse(r io.ReaderAt) error
  • func (h *XDB) UnmarshalBinary(b []byte) error

Functions

func CheckMagic

func CheckMagic(ctx context.Context, r io.Reader) bool

CheckMagic reports whether the Reader starts with a magic header for a file format supported by this package.

Types

type Index

type Index struct {
	// contains filtered or unexported fields
}

Index is an index over an RPM tag.

func (*Index) Lookup

func (i *Index) Lookup(s string) (pg []IndexPair, err error)

Lookup returns the pair (if any) for the provided key.

func (*Index) Parse

func (i *Index) Parse(r io.ReaderAt) error

Parse closes over the provided io.ReaderAt and populates the provided Index.

func (*Index) UnmarshalBinary

func (i *Index) UnmarshalBinary(b []byte) error

UnmarshalBinary implements encoding.BinaryUnmarshaler for an Index header.

type IndexPair

type IndexPair struct {
	Package uint32
	Data    uint32
}

IndexPair is the package index and data offset.

type PackageDB

type PackageDB struct {
	// contains filtered or unexported fields
}

PackageDB is the "pkgdb" a.k.a. "Packages.db", the raw package data.

func (*PackageDB) AllHeaders

func (db *PackageDB) AllHeaders(_ context.Context) ([]io.ReaderAt, error)

AllHeaders returns ReaderAts for all RPM headers in the PackageDB.

func (*PackageDB) GetHeader

func (db *PackageDB) GetHeader(pkgID uint32) (io.ReaderAt, error)

GetHeader returns an io.ReaderAt populated with rpm.Header data or reports an error.

func (*PackageDB) Parse

func (db *PackageDB) Parse(r io.ReaderAt) error

Parse closes over the provided io.ReaderAt and populates the provided PackageDB.

func (*PackageDB) UnmarshalBinary

func (h *PackageDB) UnmarshalBinary(b []byte) error

UnmarshalBinary implements encoding.BinaryUnmarshaler for a PackageDB header.

type XDB

type XDB struct {
	// contains filtered or unexported fields
}

XDB is the "xdb" a.k.a. "Index.db", the ndb mechanism for creating indexes.

func (*XDB) Index

func (db *XDB) Index(tag rpm.Tag) (*Index, error)

Index reports the index for the specifed tag.

func (*XDB) Parse

func (db *XDB) Parse(r io.ReaderAt) error

Parse closes over the passed io.ReaderAt and populates the XDB.

func (*XDB) UnmarshalBinary

func (h *XDB) UnmarshalBinary(b []byte) error

UnmarshalBinary implements encoding.BinaryUnmarshaler for the xdb header.