added resizer

lib/danbooru_image_resizer/JPEGReader.h

@@ -0,0 +1,47 @@
+#ifndef JPEG_READER_H
+#define JPEG_READER_H
+
+#include <stdio.h>
+#include <stdint.h>
+#include <setjmp.h>
+#include "jpeglib-extern.h"
+#include "Reader.h"
+
+struct jpeg_error
+{
+	struct jpeg_error_mgr pub;
+	jmp_buf setjmp_buffer;
+	char *buffer;
+};
+
+class JPEG: public Reader
+{
+public:
+	bool Read(FILE *f, Resizer *resizer, char error[1024]);
+
+private:
+	Resizer *m_Resizer;
+	struct jpeg_error m_JErr;
+};
+
+class JPEGCompressor
+{
+public:
+	JPEGCompressor(FILE *f);
+	~JPEGCompressor();
+
+	bool Init(int width, int height, int quality);
+	bool WriteRow(uint8_t *row);
+	bool Finish();
+
+	int GetWidth() const;
+	int GetHeight() const;
+	const char *GetError() const;
+
+private:
+	FILE *m_File;
+	struct jpeg_compress_struct m_CInfo;
+	struct jpeg_error m_JErr;
+};
+
+#endif