png

Documentation

Index

• type Chunk
• type Parser
  • func New() *Parser
  • func (p *Parser) Detect(r io.ReaderAt) bool
  • func (p *Parser) Name() string
  • func (p *Parser) Parse(r io.ReaderAt) ([]parser.Directory, *parser.ParseError)

Types

type Chunk

type Chunk struct {
	Length     uint32
	Type       string
	DataOffset int64
}

Chunk represents a PNG chunk

type Parser

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

Parser parses PNG image files.

Supported metadata:

• EXIF (eXIf chunk)
• XMP (iTXt chunk with keyword "XML:com.adobe.xmp")
• ICC Profile (iCCP chunk)
• Text metadata (tEXt, zTXt, iTXt chunks)

PNG uses a chunk-based format.

func New

func New() *Parser

New creates a new PNG parser

func (*Parser) Detect

func (p *Parser) Detect(r io.ReaderAt) bool

Detect checks if the data is a PNG file

func (*Parser) Name

func (p *Parser) Name() string

Name returns the parser name

func (*Parser) Parse

func (p *Parser) Parse(r io.ReaderAt) ([]parser.Directory, *parser.ParseError)

Parse extracts metadata from a PNG file