com.github.cosycode.bdmp.BdmpUtils Maven / Gradle / Ivy
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package com.github.cosycode.bdmp;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Description : 图片工具类
*
* @author CPF
* Date: 2020/5/21 9:35
*/
public class BdmpUtils {
private BdmpUtils() {
}
/**
* 获取不同种类的像素数量
*
* @param powerOf2 2的指数幂, 可选值为 1, 2, 4, 8, 以及8的倍数,
* 像素颜色类型为 2 ^ powerOf2 个,
* 如果为 1, 像素颜色为 2种, 每 1 个bit作为一个像素,
* 如果为 2, 像素颜色为 4种, 每 2 个bit作为一个像素存储.
* 如果为 4, 像素颜色为 16种, 每 4 个bit作为一个像素存储.
* 如果为 8, 像素颜色为256种, 每 8 个bit作为一个像素存储.
* 如果为8n, 像素颜色为 2 ^ 8n 种, 每 8n 个bit作为一个像素存储.
* @return 像素颜色数组
*/
@SuppressWarnings({"java:S3776", "all"})
public static Color[] getPxType(int powerOf2) {
Color[] colors;
switch (powerOf2) {
case 1:
colors = new Color[]{Color.RED, Color.BLUE};
break;
case 2:
colors = new Color[]{Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW};
break;
case 4: {
int[] rArr = {0x10, 0xe0};
int[] gArr = rArr;
int[] bArr = {0x00, 0x50, 0xa0, 0xf0};
colors = new Color[rArr.length * gArr.length * bArr.length];
int n = 0;
for (int r : rArr) {
for (int g : gArr) {
for (int b : bArr) {
colors[n++] = new Color(r, g, b);
}
}
}
}
break;
case 8: {
// 4进制
int[] rArr = {0x00, 0x50, 0xa0, 0xf0};
// 8进制
int[] gArr = {0x10, 0x30, 0x50, 0x70, 0x90, 0xb0, 0xd0, 0xf0};
int[] bArr = gArr;
colors = new Color[rArr.length * gArr.length * bArr.length];
int n = 0;
for (int r : rArr) {
for (int g : gArr) {
for (int b : bArr) {
colors[n++] = new Color(r, g, b);
}
}
}
}
break;
default:
throw new RuntimeException("不支持的类型");
}
return colors;
}
/**
* 将int转换为byte数组
*
* @param number 整形数据
* @return 转换后的byte数组
*/
public static byte[] toBytes(int number) {
byte[] bytes = new byte[4];
bytes[3] = (byte) number;
bytes[2] = (byte) (number >>> 8);
bytes[1] = (byte) (number >>> 16);
bytes[0] = (byte) (number >>> 24);
return bytes;
}
/**
* 将一个byte数组, 按照进制基数, 转换为另一个byte数组
*
* eg: 当powOf2 为4, 将 [bbbbbbbb] 转换为 [0000bbbb, 0000bbbb], b代表有含义的数
*
* @param powOf2 {@link BdmpUtils#deCodeToByte(int, byte[])}
*/
@SuppressWarnings("java:S127")
public static int[] convertByte(int powOf2, byte[] b, int len) {
int[] r = null;
if (powOf2 == 2) {
r = new int[len * 8];
for (int i = 0, j = 0; i < len; i++) {
r[j++] = ((b[i] & 0b10000000) >>> 7);
r[j++] = (byte) ((b[i] & 0b01000000) >>> 6);
r[j++] = (byte) ((b[i] & 0b00100000) >>> 5);
r[j++] = (byte) ((b[i] & 0b00010000) >>> 4);
r[j++] = (byte) ((b[i] & 0b00001000) >>> 3);
r[j++] = (byte) ((b[i] & 0b00000100) >>> 2);
r[j++] = (byte) ((b[i] & 0b00000010) >>> 1);
r[j++] = (byte) (b[i] & 0b00000001);
}
} else if (powOf2 == 4) {
r = new int[len * 4];
for (int i = 0, j = 0; i < len; i++) {
r[j++] = (byte) ((b[i] & 0b11000000) >>> 6);
r[j++] = (byte) ((b[i] & 0b00110000) >>> 4);
r[j++] = (byte) ((b[i] & 0b00001100) >>> 2);
r[j++] = (byte) (b[i] & 0b00000011);
}
} else if (powOf2 == 16) {
r = new int[len * 2];
for (int i = 0, j = 0; i < len; i++) {
r[j++] = (byte) ((b[i] & 0b11110000) >>> 4);
r[j++] = (byte) (b[i] & 0b00001111);
}
} else if (powOf2 == 256) {
r = new int[len];
for (int i = 0; i < len; i++) {
r[i] = Byte.toUnsignedInt(b[i]);
}
}
return r;
}
/**
* 将一个byte数组, 按照进制基数, 转换为另一个byte数组
*
* eg: 当powOf2 为4, 将 [bbbbbbbb] 转换为 [0000bbbb, 0000bbbb], b代表有含义的数
*
* @param bit {@link BdmpUtils#deCodeToByte(int, byte[])}
*/
@SuppressWarnings("java:S127")
public static int[] concatByte(int bit, byte[] b, int len) {
int[] r = null;
if (bit == 1) {
r = new int[len * 8];
for (int i = 0, j = 0; i < len; i++) {
r[j++] = ((b[i] & 0b10000000) >>> 7);
r[j++] = (byte) ((b[i] & 0b01000000) >>> 6);
r[j++] = (byte) ((b[i] & 0b00100000) >>> 5);
r[j++] = (byte) ((b[i] & 0b00010000) >>> 4);
r[j++] = (byte) ((b[i] & 0b00001000) >>> 3);
r[j++] = (byte) ((b[i] & 0b00000100) >>> 2);
r[j++] = (byte) ((b[i] & 0b00000010) >>> 1);
r[j++] = (byte) (b[i] & 0b00000001);
}
} else if (bit == 2) {
r = new int[len * 4];
for (int i = 0, j = 0; i < len; i++) {
r[j++] = (byte) ((b[i] & 0b11000000) >>> 6);
r[j++] = (byte) ((b[i] & 0b00110000) >>> 4);
r[j++] = (byte) ((b[i] & 0b00001100) >>> 2);
r[j++] = (byte) (b[i] & 0b00000011);
}
} else if (bit == 4) {
r = new int[len * 2];
for (int i = 0, j = 0; i < len; i++) {
r[j++] = (byte) ((b[i] & 0b11110000) >>> 4);
r[j++] = (byte) (b[i] & 0b00001111);
}
} else if (bit == 8) {
r = new int[len];
for (int i = 0; i < len; i++) {
r[i] = Byte.toUnsignedInt(b[i]);
}
}
return r;
}
/**
* 将 byte 数组 按 powOf2 bit 整合数组
* eg: 当powOf2 为4, 将 [0000bbbb, 0000bbbb] 转换为 [bbbbbbbb], b代表有含义的数
*
* @param powOf2 bit位
* @param valArr 值数组
* @return 转换后的数组
*/
public static byte[] deCodeToByte(int powOf2, byte[] valArr) {
int len = valArr.length;
int loop = len * powOf2 / 8;
byte[] bytes = new byte[loop];
int n = 0;
if (powOf2 == 1) {
for (int i = 0; i < loop; i++) {
bytes[i] |= valArr[n++] << 7;
bytes[i] |= valArr[n++] << 6;
bytes[i] |= valArr[n++] << 5;
bytes[i] |= valArr[n++] << 4;
bytes[i] |= valArr[n++] << 3;
bytes[i] |= valArr[n++] << 2;
bytes[i] |= valArr[n++] << 1;
bytes[i] |= valArr[n++];
}
} else if (powOf2 == 2) {
for (int i = 0; i < loop; i++) {
bytes[i] |= valArr[n++] << 6;
bytes[i] |= valArr[n++] << 4;
bytes[i] |= valArr[n++] << 2;
bytes[i] |= valArr[n++];
}
} else if (powOf2 == 4) {
for (int i = 0; i < loop; i++) {
bytes[i] |= valArr[n++] << 4;
bytes[i] |= valArr[n++];
}
} else if (powOf2 == 8) {
for (int i = 0; i < loop; i++) {
bytes[i] |= valArr[n++];
}
} else {
throw new RuntimeException();
}
return bytes;
}
public static String encrypt2ToMd5(byte[] data) {
MessageDigest md5;
try {
md5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return "";
}
byte[] digest = md5.digest(data);
return new BigInteger(1, digest).toString(16);
}
/**
* 将文件转换成byte数组
*/
public static byte[] file2Byte(File tradeFile) {
try (FileInputStream fis = new FileInputStream(tradeFile);
ByteArrayOutputStream bos = new ByteArrayOutputStream()) {
byte[] b = new byte[8 * 1024];
int n;
while ((n = fis.read(b)) != -1) {
bos.write(b, 0, n);
}
return bos.toByteArray();
} catch (IOException e) {
e.printStackTrace();
}
return new byte[0];
}
/**
* copy by {@link org.apache.commons.lang3.Validate#isTrue(boolean, String, Object...)}
*/
public static void isTrue(final boolean expression, final String message, final Object... values) {
if (!expression) {
throw new IllegalArgumentException(String.format(message, values));
}
}
/**
* 从系统中加载图片
*/
public static BufferedImage load(String picPath) throws IOException {
try (InputStream is = new BufferedInputStream(new FileInputStream(picPath))) {
final BufferedImage image = ImageIO.read(is);
if (image == null) {
throw new RuntimeException("图片读取失败, 请检查文件格式是否正确");
}
return image;
}
}
}