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backslashing in expression strings '\r' '\' '"'

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This commit is contained in:
sirjonasxx 2020-06-12 16:05:47 +02:00
parent ca330c2bf2
commit 340b216b12
1 changed files with 65 additions and 8 deletions
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71
G-Earth/src/main/java/gearth/misc/packetrepresentation/PacketStringUtils.java
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@ -60,17 +60,67 @@ public class PacketStringUtils {
while (packet.contains("{s:\"")) {
int start = packet.indexOf("{s:\"");
int end = packet.indexOf("\"}");
while (end != -1 && packet.charAt(end - 1) == '\\') {
int end = -1;
boolean valid;
do {
end = packet.indexOf("\"}", end + 1);
valid = false;
if (end != -1) {
int amountBackslashes = 0;
int pos = end - 1;
while (pos >= start + 4 && packet.charAt(pos) == '\\') {
amountBackslashes++;
pos -= 1;
}
valid = amountBackslashes % 2 == 0;
}
} while (end != -1 && !valid);
if (end == -1) {
throw new InvalidPacketException();
}
String match = packet.substring(start + 4, end).replace("\\\"", "\"");;
// String match = packet.substring(start + 4, end).replace("\\\"", "\"");
String match = packet.substring(start + 4, end);
StringBuilder actualString = new StringBuilder();
while (match.contains("\\")) {
int index = match.indexOf("\\");
// we know this can't be the last character
char c = match.charAt(index + 1);
actualString.append(match, 0, index);
switch (c) {
// all characters that can be backslashed
case '"': {
actualString.append('"');
match = match.substring(index + 2);
break;
}
case 'r': {
actualString.append('\r');
match = match.substring(index + 2);
break;
}
case '\\': {
actualString.append('\\');
match = match.substring(index + 2);
break;
}
default: {
// actualString.append('\\');
// match = match.substring(index + 1);
throw new InvalidPacketException();
}
}
}
actualString.append(match);
packet = packet.substring(0, start) +
toString(new HPacket(0, match).readBytes(match.length() + 2, 6)) +
toString(new HPacket(0, actualString.toString()).readBytes(actualString.length() + 2, 6)) +
packet.substring(end + 2);
}
@ -144,7 +194,12 @@ public class PacketStringUtils {
}
}
else if (c == 'i') builder.append("{i:").append(prevInt = p.readInteger()).append('}');
else if (c == 's') builder.append("{s:\"").append(p.readString().replace("\"", "\\\"")).append("\"}");
else if (c == 's') builder.append("{s:\"").append(
p.readString()
.replace("\\", "\\\\") // \ -> \\
.replace("\"", "\\\"") // " -> \"
.replace("\r", "\\r") // CR -> \r
).append("\"}");
else if (c == 'd') builder.append("{d:").append(p.readDouble()).append('}');
else if (c == 'b') builder.append("{b:").append(p.readByte()).append('}');
else if (c == 'B') builder.append("{b:").append(p.readBoolean()).append('}');
@ -176,8 +231,10 @@ public class PacketStringUtils {
}
public static void main(String[] args) throws InvalidPacketException {
HPacket p1 = fromString("{l}{u:1129}{s:\"g\\\"fs\"}{i:0}{i:0}{d:5.7}");
System.out.println(p1);
HPacket p1 = fromString("{l}{u:1129}{s:\"\\\\\\\\\"}{i:0}{i:0}");
System.out.println(p1.toExpression());
HPacket p1_2 = fromString(p1.toExpression());
System.out.println(p1_2.toExpression());
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}");
System.out.println(p2);