cmap

Documentation

Index

• Variables
• func ExtractRaw(r pdf.Getter, ref pdf.Object) (postscript.Dict, error)
• func IsPredefined(cmap *Info) bool
• func OpenPredefined(name string) (io.ReadCloser, error)
• func ReadRaw(r io.Reader) (postscript.Dict, error)
• type CIDEncoder
  • func NewIdentityEncoder(g2c GIDToCID) CIDEncoder
  • func NewUTF8Encoder(g2c GIDToCID) CIDEncoder
• type GIDToCID
  • func NewIdentityGIDToCID() GIDToCID
  • func NewSequentialGIDToCID() GIDToCID
• type Info
  • func Extract(r pdf.Getter, obj pdf.Object) (*Info, error)
  • func New(ROS *type1.CIDSystemInfo, cs charcode.CodeSpaceRange, ...) *Info
  • func Read(r io.Reader, other map[string]*Info) (*Info, error)
  • func (info *Info) Embed(w pdf.Putter, ref pdf.Reference, other map[string]pdf.Reference) error
  • func (info *Info) GetMapping() map[charcode.CharCode]type1.CID
  • func (info *Info) IsIdentity() bool
  • func (info *Info) MaxCID() type1.CID
  • func (info *Info) SetMapping(m map[charcode.CharCode]type1.CID)
  • func (info *Info) Write(w io.Writer) error
• type Range
• type SimpleEncoder
  • func NewSimpleEncoder() *SimpleEncoder
  • func (e *SimpleEncoder) AppendEncoded(s pdf.String, gid glyph.ID, rr []rune) pdf.String
  • func (e *SimpleEncoder) Encoding() []glyph.ID
  • func (e *SimpleEncoder) Overflow() bool
  • func (e *SimpleEncoder) ToUnicode() map[charcode.CharCode][]rune
• type Single

Variables

var AllPredefined = []string{}/* 181 elements not displayed */

Functions

func ExtractRaw

func ExtractRaw(r pdf.Getter, ref pdf.Object) (postscript.Dict, error)

ExtractRaw extract the raw PostScript data of a CMap from a PDF file.

func IsPredefined

func IsPredefined(cmap *Info) bool

func OpenPredefined

func OpenPredefined(name string) (io.ReadCloser, error)

func ReadRaw

func ReadRaw(r io.Reader) (postscript.Dict, error)

ReadRaw reads the raw PostScript data of a CMap from an io.Reader.

Types

type CIDEncoder

type CIDEncoder interface {
	// AppendEncoded appends the character code for the given glyph ID
	// to the given PDF string (allocating new codes as needed).
	// It also records the fact that the character code corresponds to the
	// given unicode string.
	AppendEncoded(pdf.String, glyph.ID, []rune) pdf.String

	// CMap returns the mapping from character codes to CID values.
	// This can be used to construct a PDF CMap.
	CMap() map[charcode.CharCode]type1.CID

	// ToUnicode returns the mapping from character codes to unicode strings.
	// This can be used to construct a PDF ToUnicode CMap.
	ToUnicode() map[charcode.CharCode][]rune

	// CodeSpaceRange returns the range of character codes
	// used by this encoder.
	CodeSpaceRange() charcode.CodeSpaceRange

	// UsedGIDs is the set of all GIDs which have been used with AppendEncoded.
	// The returned slice is sorted and always starts with GID 0.
	UsedGIDs() []glyph.ID
}

CIDEncoder constructs and stores mappings from character codes to CID values and from character codes to unicode strings.

func NewIdentityEncoder

func NewIdentityEncoder(g2c GIDToCID) CIDEncoder

NewIdentityEncoder returns an encoder where two-byte codes are used directly as CID values.

func NewUTF8Encoder

func NewUTF8Encoder(g2c GIDToCID) CIDEncoder

NewUTF8Encoder returns an encoder where character codes equal the UTF-8 encoding of the text content, where possible.

type GIDToCID

type GIDToCID interface {
	CID(glyph.ID) type1.CID

	ROS() *type1.CIDSystemInfo

	GIDToCID(numGlyph int) []type1.CID
}

GIDToCID encodes a mapping from Glyph Identifier (GID) values to Character Identifier (CID) values.

func NewIdentityGIDToCID

func NewIdentityGIDToCID() GIDToCID

func NewSequentialGIDToCID

func NewSequentialGIDToCID() GIDToCID

NewSequentialGIDToCID returns a GIDToCID which assigns CID values sequentially, starting with 1.

type Info

type Info struct {
	Name     string
	Version  float64
	ROS      *type1.CIDSystemInfo
	CS       charcode.CodeSpaceRange
	CSFile   charcode.CodeSpaceRange
	WMode    int
	UseCMap  string
	Singles  []Single
	Ranges   []Range
	Comments bool
}

func Extract

func Extract(r pdf.Getter, obj pdf.Object) (*Info, error)

func New

func New(ROS *type1.CIDSystemInfo, cs charcode.CodeSpaceRange, m map[charcode.CharCode]type1.CID) *Info

func Read

func Read(r io.Reader, other map[string]*Info) (*Info, error)

func (*Info) Embed

func (info *Info) Embed(w pdf.Putter, ref pdf.Reference, other map[string]pdf.Reference) error

func (*Info) GetMapping

func (info *Info) GetMapping() map[charcode.CharCode]type1.CID

func (*Info) IsIdentity

func (info *Info) IsIdentity() bool

IsIdentity returns true if all codes are equal to the corresponding CID.

func (*Info) MaxCID

func (info *Info) MaxCID() type1.CID

func (*Info) SetMapping

func (info *Info) SetMapping(m map[charcode.CharCode]type1.CID)

SetMapping overwrites the mapping information in info with the given mapping.

To make efficient use of range entries, the generated mapping may be a superset of the original mapping, i.e. it may contain entries for charcodes which were not mapped in the original mapping.

func (*Info) Write

func (info *Info) Write(w io.Writer) error

type Range

type Range struct {
	First charcode.CharCode
	Last  charcode.CharCode
	Value type1.CID
}

Range describes a range of character codes with consecutive CIDs. First and Last are the first and last code points in the range. Value is the CID of the first code point in the range.

type SimpleEncoder

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

SimpleEncoder constructs and stores mappings from one-byte character codes to GID values and from one-byte character codes to unicode strings.

func NewSimpleEncoder

func NewSimpleEncoder() *SimpleEncoder

NewSimpleEncoder allocates a new SimpleEncoder.

func (*SimpleEncoder) AppendEncoded

func (e *SimpleEncoder) AppendEncoded(s pdf.String, gid glyph.ID, rr []rune) pdf.String

AppendEncoded appends the character code for the given glyph ID to the given PDF string (allocating new codes as needed). It also records the fact that the character code corresponds to the given unicode string.

func (*SimpleEncoder) Encoding

func (e *SimpleEncoder) Encoding() []glyph.ID

Encoding returns the glyph ID corresponding to each character code.

func (*SimpleEncoder) Overflow

func (e *SimpleEncoder) Overflow() bool

Overflow returns true if the encoder has run out of codes.

func (*SimpleEncoder) ToUnicode

func (e *SimpleEncoder) ToUnicode() map[charcode.CharCode][]rune

ToUnicode returns the mapping from character codes to unicode strings. This can be used to construct a PDF ToUnicode CMap.

type Single

type Single struct {
	Code  charcode.CharCode
	Value type1.CID
}

Single specifies that character code Code represents the given CID.