Exiv2::Internal::PngChunk Class Reference

Stateless parser class for data in PNG chunk format. Images use this class to decode and encode PNG-based data. More...

#include <pngchunk_int.hpp>

List of all members.

Public Types
enum	TxtChunkType { tEXt_Chunk = 0, zTXt_Chunk = 1, iTXt_Chunk = 2 }
	Text Chunk types.
Static Public Member Functions
void	decodeIHDRChunk (const DataBuf &data, int *outWidth, int *outHeight)
	Decode PNG IHDR chunk data from a data buffer data and return image size to outWidth and outHeight.
void	decodeTXTChunk (Image *pImage, const DataBuf &data, TxtChunkType type)
	Decode PNG tEXt, zTXt, or iTXt chunk data from pImage passed by data buffer data and extract Comment, Exif, Iptc, Xmp metadata accordingly.
DataBuf	keyTXTChunk (const DataBuf &data, bool stripHeader=false)
	Return PNG TXT chunk key as data buffer.
std::string	makeMetadataChunk (const std::string &metadata, MetadataId type)
	Return a complete PNG chunk data compressed or not as buffer. Data returned is formated accordingly with metadata type to host passed by metadata.

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Detailed Description

Stateless parser class for data in PNG chunk format. Images use this class to decode and encode PNG-based data.

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Member Function Documentation

void Exiv2::Internal::PngChunk::decodeIHDRChunk (  const DataBuf &  data, int *  outWidth, int *  outHeight )  [static]

Decode PNG IHDR chunk data from a data buffer data and return image size to outWidth and outHeight. Parameters: data  PNG Chunk data buffer. outWidth  Integer pointer to be set to the width of the image. outHeight  Integer pointer to be set to the height of the image.

void Exiv2::Internal::PngChunk::decodeTXTChunk (  Image *  pImage, const DataBuf &  data, TxtChunkType  type )  [static]

Decode PNG tEXt, zTXt, or iTXt chunk data from pImage passed by data buffer data and extract Comment, Exif, Iptc, Xmp metadata accordingly. Parameters: pImage  Pointer to the image to hold the metadata data  PNG Chunk data buffer. type  PNG Chunk TXT type.

DataBuf Exiv2::Internal::PngChunk::keyTXTChunk (  const DataBuf &  data, bool  stripHeader = false )  [static]

Return PNG TXT chunk key as data buffer. Parameters: data  PNG Chunk data buffer. stripHeader  Set true if chunk data start with header bytes, else false (default).

std::string Exiv2::Internal::PngChunk::makeMetadataChunk (  const std::string &  metadata, MetadataId  type )  [static]

Return a complete PNG chunk data compressed or not as buffer. Data returned is formated accordingly with metadata type to host passed by metadata. Parameters: metadata  metadata buffer. type  metadata type.

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The documentation for this class was generated from the following files:

• pngchunk_int.hpp
• pngchunk.cpp

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