AlarmServer/Image/JpegImage.h

#ifndef JPEGIMAGE_H
#define JPEGIMAGE_H

#include <string>
#include <vector>
#include <jpeglib.h>


namespace Image {

class JpegImage
{
public:
	JpegImage();

	void SetImageData(const std::string& data);

	unsigned int Width() const;
	unsigned int Height() const;
	unsigned int StrideX() const;
	unsigned int StrideY() const;
	const std::vector<char>& Data() const;

private:
	struct SourceMgr
	{
		struct jpeg_source_mgr pub;
		const JOCTET *data;
		size_t len;
	};
	typedef SourceMgr* SourceMgrPtr;

private:
	static void InitSource(j_decompress_ptr pCinfo);
	static boolean FillInputBuffer(j_decompress_ptr pCinfo);
	static void SkipInputData(j_decompress_ptr pCinfo, long numBytes);
	static void TermSource(j_decompress_ptr pCinfo);

	void SetSourceMgr(j_decompress_ptr pCinfo, const char* pData, size_t len) const;

	void DecompressImage(const char* pData, size_t len);

private:
	unsigned int m_width;
	unsigned int m_height;
	unsigned int m_strideX;
	unsigned int m_strideY;

	std::vector<char> m_data;
};

} // namespace Image

#endif // JPEGIMAGE_H