package com.fzzy.igds.utils;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;

/**
 * @Description 图片Base处理
 * @Author CZT
 * @Date 2026/1/7 11:07
 */
public class Base64Util {

	public static String BASE_IMG_START = "data:image/jpg;base64,";

	/**
	 * 根据地址，把图片转换为Base64字符串
	 * <p>
	 * data:image/jpg;base64,
	 *
	 * @param diskFile
	 * @return
	 */
	public static String getImageStr(String diskFile) {
		InputStream in = null;
		byte[] data = null;
		// 读取图片字节数组
		try {
			in = new FileInputStream(diskFile);
			data = new byte[in.available()];
			in.read(data);
			// in.close();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (null != in)
					in.close();
			} catch (Exception e) {
			}
		}
		BASE64Encoder encoder = new BASE64Encoder();
		return BASE_IMG_START + encoder.encode(data);
	}

	/**
	 * 对字节数组字符串进行Base64解码并生成图片
	 *
	 * @param imgStr
	 * @return
	 */
	public static boolean generateImage(String imgStr, String diskFile) {
		if (imgStr == null)
			return false;

		if (imgStr.startsWith("data:")) {
			imgStr = imgStr.substring(BASE_IMG_START.length());
		}
		BASE64Decoder decoder = new BASE64Decoder();
		OutputStream out = null;
		try {
			// Base64解码
			byte[] b = decoder.decodeBuffer(imgStr);
			for (int i = 0; i < b.length; ++i) {
				if (b[i] < 0) {
					b[i] += 256;
				}
			}
			// 生成jpeg图片
			out = new FileOutputStream(diskFile);
			out.write(b);
			out.flush();
			// out.close();
			return true;
		} catch (Exception e) {
			return false;
		} finally {
			try {
				if (null != out)
					out.close();
			} catch (Exception e) {

			}
		}
	}

}