/*
	CONSOLE PICTURE FORMAT CONVERSION TOOL, COPYRIGHT@2017~2019 BY HAPPY, VERSION 1.0
	IMGCONV.EXE
*/

#include <stdio.h>
#include <windows.h>
#include <gdiplus.h>
#pragma comment(lib, "GdiPlus.lib")
//使用GDI+
using namespace Gdiplus;

//定义帮助说明
#define HELP_INFORMATION "\
-----------------------------------------------------------------\n\
CONSOLE PICTURE FORMAT CONVERSION TOOL, VERSION 1.0\n\
-----------------------------------------------------------------\n\
imgconv [input] [output]\n\
-----------------------------------------------------------------\n\
        Support bmp png gif jpg  jpeg tiff exif ico\n\
-----------------------------------------------------------------\n\
COPYRIGHT@2017~2019 BY HAPPY,2017-02-06"

//转码宽字符
WCHAR* L(const CHAR* str)
{
	if(!str){return NULL;}
	int wLen=MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, NULL, 0);
	WCHAR* wstr=(WCHAR*)malloc(sizeof(WCHAR)*wLen + 1);
	MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, str, -1, wstr, wLen);
	wstr[wLen]='\0';
	return wstr;
}

//获取编码器CLSID
BOOL GetEncoderClsid(const WCHAR* format, CLSID* pClsid)
{
	UINT j, n=0, s=0;
	ImageCodecInfo* pInfo=NULL;
	GetImageEncodersSize(&n, &s);
	if(s==0){return FALSE;}
	pInfo=(ImageCodecInfo*)(malloc(s));
	if(pInfo==NULL){return FALSE;}
	GetImageEncoders(n, s, pInfo);
	for(j=0; j<n; j++){
		if(wcscmp(pInfo[j].MimeType, format)==0){
			*pClsid=pInfo[j].Clsid;
			free(pInfo);
			return TRUE;
		}    
	}
	free(pInfo);
	return FALSE;
}

//主函数入口
int main(int argc, char** argv)
{
	if(argc!=3){
		//输入错误，则抛出使用说明
		fputs(HELP_INFORMATION, stderr);
		exit(1);
	}
	CHAR *p=argv[2], *formatSTR=NULL;
	while(*p!='\0'){p++;}
	int   l=p-argv[2];
	if(l<4){
		//扩展名过于短小
		fputs("The extension is too short", stderr);
		exit(1);
	}
	if(argv[2][l-4]=='.'){
		switch(argv[2][l-3]){
			case 'b':
				formatSTR="image/bmp";
				break;
			case 'p':
				formatSTR="image/png";
				break;
			case 'g':
				formatSTR="image/gif";
				break;
			case 'i':
				formatSTR="image/ico";
				break;
			case 'j':
				formatSTR="image/jpeg";
				break;
			default:
				//错误的图片转换格式
				fputs("Wrong picture conversion format", stderr);
				exit(1);
		}
	}else if(argv[2][l-5]=='.'){
		switch(argv[2][l-4]){
			case 'j':
				formatSTR="image/jpeg";
				break;
			case 't':
				formatSTR="image/tiff";
				break;
			case 'e':
				formatSTR="image/exif";
				break;
			default:
				//错误的图片转换格式
				fputs("Wrong picture conversion format", stderr);
				exit(1);
		}
	}else{
		//错误的图片转换格式
		fputs("Wrong picture conversion format", stderr);
		exit(1);
	}	

	//初始化GDI+
	ULONG_PTR gdipludToken;
	GdiplusStartupInput gdiplusInput;
	GdiplusStartup(&gdipludToken,&gdiplusInput,NULL);
	//读取图像
	Image* srcIMG=Image::FromFile(L(argv[1]));
	CLSID  clsid;
	if(GetEncoderClsid(L(formatSTR), &clsid)){
		//保存位图
		srcIMG->Save(L(argv[2]), &clsid, NULL);
	}else{
		//无法转换图片格式
		fputs("Can't conversion format", stderr);
		exit(1);
	}
	//关闭GDI+
	GdiplusShutdown(gdipludToken);
	return 0;
}
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