mirror of
https://github.com/sirjonasxx/G-Earth.git
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redoing part of hpacket code
This commit is contained in:
sirjonasxx
parent
efc8362c3c
commit
bab0d11c59
@ -0,0 +1,4 @@
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package gearth.misc.packetrepresentation;
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public class InvalidPacketException extends Exception {
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}
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@ -0,0 +1,143 @@
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package gearth.misc.packetrepresentation;
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import gearth.protocol.HPacket;
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import java.nio.ByteBuffer;
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import java.nio.charset.StandardCharsets;
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import java.util.function.Function;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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// for all the logistics behind bytes-string conversion
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public class PacketStructure {
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private static String replaceAll(String templateText, String regex,
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Function<Matcher, String> replacer) {
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Pattern pattern = Pattern.compile(regex);
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Matcher matcher = pattern.matcher(templateText);
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StringBuffer result = new StringBuffer();
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while (matcher.find()) {
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matcher.appendReplacement(result, replacer.apply(matcher));
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}
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matcher.appendTail(result);
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return result.toString();
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}
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public static HPacket fromString(String packet) throws InvalidPacketException {
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boolean fixLengthLater = false;
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if (packet.startsWith("{l}")) {
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fixLengthLater = true;
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packet = packet.substring(3);
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}
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// note: in String expressions {s:"string"}, character " needs to be backslashed -> \" if used in string
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packet = replaceAll(packet, "\\{i:(-?[0-9]+)}",
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m -> toString(ByteBuffer.allocate(4).putInt(Integer.parseInt(m.group(1))).array()));
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packet = replaceAll(packet, "\\{d:(-?[0-9]*\\.[0-9]*)}",
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m -> toString(ByteBuffer.allocate(8).putDouble(Double.parseDouble(m.group(1))).array()));
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packet = replaceAll(packet, "\\{u:([0-9]+)}",
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m -> "[" + (Integer.parseInt(m.group(1))/256) + "][" + (Integer.parseInt(m.group(1)) % 256) + "]");
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packet = replaceAll(packet, "\\{b:([Ff]alse|[Tt]rue)}",
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m -> m.group(1).toLowerCase().equals("true") ? "[1]" : "[0]");
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packet = replaceAll(packet, "\\{b:([0-9]{1,3})}",
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m -> "[" + Integer.parseInt(m.group(1)) + "]");
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packet = replaceAll(packet, "\\{s:\"(([^\"]|(\\\\\"))*)\"}",
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m -> {
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String match = m.group(1).replace("\\\"", "\"");
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return toString(new HPacket(0, match).readBytes(match.length() + 2, 6));
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});
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if (packet.contains("{") || packet.contains("}")) {
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throw new InvalidPacketException();
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}
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boolean[] corrupted = new boolean[]{false};
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packet = replaceAll(packet, "\\[([0-9]{1,3})]", m -> {
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int b = Integer.parseInt(m.group(1));
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if (b < 0 || b >= 256) {
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corrupted[0] = true;
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return "";
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}
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return new String(new byte[]{(byte) (b > 127 ? b - 256 : b)}, StandardCharsets.ISO_8859_1);
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});
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if (corrupted[0]) {
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throw new InvalidPacketException();
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}
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byte[] packetInBytes = packet.getBytes(StandardCharsets.ISO_8859_1);
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if (fixLengthLater) {
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byte[] combined = new byte[4 + packetInBytes.length];
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System.arraycopy(packetInBytes,0, combined, 4, packetInBytes.length);
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packetInBytes = combined;
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}
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HPacket hPacket = new HPacket(packetInBytes);
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if (fixLengthLater) {
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hPacket.fixLength();
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}
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return hPacket;
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}
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public static String toString(byte[] packet) {
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StringBuilder teststring = new StringBuilder();
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for (byte x : packet) {
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if ((x < 32 && x >= 0) || x < -96 || x == 93 || x == 91 || x == 125 || x == 123 || x == 127 )
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teststring.append("[").append((((int) x) + 256) % 256).append("]");
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else {
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teststring.append(new String(new byte[]{x}, StandardCharsets.ISO_8859_1));
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}
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}
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return teststring.toString();
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}
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public static boolean structureEquals(HPacket packet, String structure) {
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if (packet.isCorrupted()) return false;
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int indexbuffer = packet.getReadIndex();
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packet.setReadIndex(6);
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String[] split = structure.split(",");
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for (int i = 0; i < split.length; i++) {
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String s = split[i];
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if (s.equals("s")) {
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if (packet.getReadIndex() + 2 > packet.getBytesLength() ||
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packet.readUshort(packet.getReadIndex()) + 2 + packet.getReadIndex() > packet.getBytesLength()) return false;
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packet.readString();
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}
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else if (s.equals("i")) {
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if (packet.getReadIndex() + 4 > packet.getBytesLength()) return false;
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packet.readInteger();
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}
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else if (s.equals("u")) {
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if (packet.getReadIndex() + 2 > packet.getBytesLength()) return false;
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packet.readUshort();
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}
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else if (s.equals("b")) {
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if (packet.getReadIndex() + 1 > packet.getBytesLength()) return false;
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packet.readBoolean();
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}
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}
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boolean result = (packet.isEOF() == 1);
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packet.setReadIndex(indexbuffer);
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return result;
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}
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public static void main(String[] args) throws InvalidPacketException {
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HPacket p1 = fromString("{l}{u:1129}{s:\"g\\\"fs\"}{i:0}{i:0}{d:5.7}");
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System.out.println(p1);
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HPacket p2 = fromString("{l}{u:4564}{i:3}{i:0}{s:\"hi\"}{i:0}{i:1}{s:\"how\"}{i:3}{b:1}{b:2}{b:3}{i:2}{s:\"r u\"}{i:1}{b:120}{i:2}{b:true}");
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System.out.println(p2);
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}
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}
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@ -3,12 +3,13 @@ package gearth.protocol;
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import gearth.misc.StringifyAble;
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import gearth.misc.harble_api.HarbleAPI;
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import gearth.misc.harble_api.HarbleAPIFetcher;
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import gearth.misc.packetrepresentation.InvalidPacketException;
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import gearth.misc.packetrepresentation.PacketStructure;
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import java.io.UnsupportedEncodingException;
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import java.nio.ByteBuffer;
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import java.nio.charset.StandardCharsets;
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import java.security.InvalidParameterException;
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import java.util.ArrayList;
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import java.util.Arrays;
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public class HPacket implements StringifyAble {
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@ -25,7 +26,13 @@ public class HPacket implements StringifyAble {
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isEdited = packet.isEdited;
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}
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public HPacket(String packet) {
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packetInBytes = fromStringToBytes(fromExpressionToString(packet));
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try {
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packetInBytes = PacketStructure.fromString(packet).packetInBytes;
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} catch (InvalidPacketException e) {
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packetInBytes = new byte[0];
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// will be corrupted
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e.printStackTrace();
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}
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}
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public HPacket(int header) {
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packetInBytes = new byte[]{0,0,0,2,0,0};
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@ -68,193 +75,11 @@ public class HPacket implements StringifyAble {
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}
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public String toString() {
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String teststring = "";
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for (byte x : packetInBytes) {
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if ((x < 32 && x >= 0) || x < -96 || x == 93 || x == 91 || x == 125 || x == 123 || x == 127 )
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teststring+="["+((((int)x) + 256 ) % 256)+"]";
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else
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try {
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teststring+=new String(new byte[]{x}, "ISO-8859-1"); //"ISO-8859-1"
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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}
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return teststring;
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}
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/**
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* returns "" if invalid expression, replaces all {} occurences except {l}
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* @return
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*/
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private static String fromExpressionToString(String input) {
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try {
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int i = 0;
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char[] asChararray = input.toCharArray();
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StringBuilder newString = new StringBuilder();
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if (input.startsWith("{l}")) {
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newString.append("{l}");
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i = 3;
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}
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while (i < input.length()) {
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if (asChararray[i] != '{') {
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newString.append(asChararray[i]);
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i++;
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}
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else {
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i++;
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StringBuilder typeBuilder = new StringBuilder();
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while (i < input.length() && asChararray[i] != ':') {
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typeBuilder.append(asChararray[i]);
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i++;
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}
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if (i == input.length()) throw new Exception();
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String type = typeBuilder.toString();
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i++;
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StringBuilder inhoudBuilder = new StringBuilder();
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while (i < input.length() && asChararray[i] != '}') {
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inhoudBuilder.append(asChararray[i]);
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i++;
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}
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if (i == input.length()) throw new Exception();
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String inhoud = inhoudBuilder.toString();
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i++;
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if (type.equals("u")) {
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int probs = Integer.parseInt(inhoud);
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if (probs < 0 || probs >= 256 * 256) throw new Exception();
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newString.append("[").append(probs / 256).append("][").append(probs % 256).append("]");
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}
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else if (type.equals("i")) {
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ByteBuffer b = ByteBuffer.allocate(4).putInt(Integer.parseInt(inhoud));
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newString.append(new HPacket(b.array()).toString());
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}
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else if (type.equals("d")) {
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ByteBuffer b = ByteBuffer.allocate(8).putDouble(Double.parseDouble(inhoud));
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newString.append(new HPacket(b.array()).toString());
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}
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else if (type.equals("b")) { // could be a byte or a boolean, no one cares
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if (inhoud.toLowerCase().equals("true") || inhoud.toLowerCase().equals("false")) {
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newString.append(inhoud.toLowerCase().equals("true") ? "[1]" : "[0]");
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}
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else {
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int probs = Integer.parseInt(inhoud);
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if (probs < 0 || probs >= 256) throw new Exception();
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newString.append("[").append(probs).append("]");
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}
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}
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else if (type.equals("s")) {
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int probs = inhoud.length();
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if (probs < 0 || probs >= 256 * 256) throw new Exception();
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newString.append("[").append(probs / 256).append("][").append(probs % 256).append("]");
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byte[] bts = inhoud.getBytes(StandardCharsets.ISO_8859_1);
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for (int j = 0; j < inhoud.length(); j++) {
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newString.append("[").append((((int)(bts[j])) + 256) % 256).append("]");
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}
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}
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else throw new Exception();
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}
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}
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return newString.toString();
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}
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catch( Exception e) {
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return "";
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}
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}
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private static byte[] fromStringToBytes(String curstring) {
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try {
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ArrayList<Byte> bytes = new ArrayList<>();
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int index = 0;
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char[] asChararray = curstring.toCharArray();
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byte[] asliteralbytes = curstring.getBytes("ISO-8859-1");
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boolean startWithLength = false;
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if (curstring.startsWith("{l}")) {
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startWithLength = true;
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index = 3;
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}
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while (index < curstring.length()) {
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if (asChararray[index] == '[') {
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int l = 2;
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while (index + l < curstring.length() && asChararray[index + l] != ']') l++;
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if (index + l == curstring.length()) throw new Exception();
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int result = Integer.parseInt(curstring.substring(index + 1, index + l));
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if (result > 255 || result < 0) throw new Exception();
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byte rl = result > 127 ? (byte)(result - 256) : (byte)result ;
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bytes.add(rl);
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index = index + 1 + l;
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}
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else {
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bytes.add(asliteralbytes[index]);
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index++;
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}
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}
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byte[] result;
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if (startWithLength) {
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result = new byte[bytes.size() + 4];
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ByteBuffer b = ByteBuffer.allocate(4);
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b.putInt(bytes.size());
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for (int i = 0; i < 4; i++) {
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result[i] = b.array()[i];
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}
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for (int i = 0; i < bytes.size(); i++) {
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result[i + 4] = bytes.get(i);
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}
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}
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else {
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result = new byte[bytes.size()];
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for (int i = 0; i < bytes.size(); i++) {
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result[i] = bytes.get(i);
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}
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}
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return result;
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}
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catch (Exception e){}
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return new byte[0];
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return PacketStructure.toString(packetInBytes);
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}
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public boolean structureEquals(String structure) {
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if (isCorrupted()) return false;
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int indexbuffer = readIndex;
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readIndex = 6;
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String[] split = structure.split(",");
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for (int i = 0; i < split.length; i++) {
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String s = split[i];
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if (s.equals("s")) {
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if (readIndex + 2 > getBytesLength() || readUshort(readIndex) + 2 + readIndex > getBytesLength()) return false;
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readString();
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}
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else if (s.equals("i")) {
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if (readIndex + 4 > getBytesLength()) return false;
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readInteger();
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}
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else if (s.equals("u")) {
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if (readIndex + 2 > getBytesLength()) return false;
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readUshort();
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}
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else if (s.equals("b")) {
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if (readIndex + 1 > getBytesLength()) return false;
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readBoolean();
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}
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}
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boolean result = (isEOF() == 1);
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readIndex = indexbuffer;
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return result;
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return PacketStructure.structureEquals(this, structure);
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}
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public int isEOF() {
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@ -711,7 +536,7 @@ public class HPacket implements StringifyAble {
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}
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}
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else if (c == 'i') builder.append("{i:").append(prevInt = readInteger()).append('}');
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else if (c == 's') builder.append("{s:").append(readString()).append('}');
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else if (c == 's') builder.append("{s:\"").append(readString().replace("\"", "\\\"")).append("\"}");
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else if (c == 'd') builder.append("{d:").append(readDouble()).append('}');
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else if (c == 'b') builder.append("{b:").append(readByte()).append('}');
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else if (c == 'B') builder.append("{b:").append(readBoolean()).append('}');
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@ -769,7 +594,7 @@ public class HPacket implements StringifyAble {
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for (int j = i; j < potentialstringlength+i+2; j++) {
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mask[j] = true;
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}
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resultTest[i] = "{s:"+readString(i)+"}";
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resultTest[i] = "{s:\""+readString(i).replace("\"", "\\\"")+"\"}";
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i += (1 + potentialstringlength);
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}
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}
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@ -875,7 +700,7 @@ public class HPacket implements StringifyAble {
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mask[j] = true;
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}
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changed = true;
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resultTest[i] = "{s:"+readString(i)+"}";
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resultTest[i] = "{s:\""+readString(i).replace("\"", "\\\"")+"\"}";
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i += (1 + potentialstringlength);
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}
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}
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@ -961,7 +786,7 @@ public class HPacket implements StringifyAble {
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for (int j = i; j < potentialstringlength+i+2; j++) {
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mask[j] = true;
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}
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resultTest[i] = "{s:"+readString(i)+"}";
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resultTest[i] = "{s:\""+readString(i).replace("\"", "\\\"")+"\"}";
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i += (1 + potentialstringlength);
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changed = true;
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}
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@ -1000,7 +825,7 @@ public class HPacket implements StringifyAble {
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if (resultTest[i] != null) expression.append(resultTest[i]);
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}
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return expression.toString().replace("{i:0}{b:false}{b:true}", "{s:}{i:1}");
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return expression.toString().replace("{i:0}{b:false}{b:true}", "{s:\"\"}{i:1}");
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}
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@Override
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@ -1025,9 +850,9 @@ public class HPacket implements StringifyAble {
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}
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public static void main(String[] args) {
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HPacket packet = new HPacket("{l}{u:4564}{i:3}{i:0}{s:hi}{i:0}{i:1}{s:how}{i:3}{b:1}{b:2}{b:3}{i:2}{s:r u}{i:1}{b:120}{i:2}{b:true}");
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HPacket packet = new HPacket("{l}{u:4564}{i:3}{i:0}{s:\"hi\"}{i:0}{i:1}{s:\"how\"}{i:3}{b:1}{b:2}{b:3}{i:2}{s:\"r u\"}{i:1}{b:120}{i:2}{b:true}{d:1.4}");
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String str = packet.toExpressionFromGivenStructure("i(isi(b))iB");
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String str = packet.toExpressionFromGivenStructure("i(isi(b))iBd");
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HPacket packetverify = new HPacket(str);
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