98 lines
2.6 KiB
Java
98 lines
2.6 KiB
Java
package biz.nellemann.syslogd.parser;
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/*
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Code from https://gist.github.com/jjfiv/2ac5c081e088779f49aa, which is BSD licensed: http://lemurproject.org/galago-license
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*/
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public class JsonUtil {
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public static String encode(String input) {
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StringBuilder output = new StringBuilder();
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for(int i=0; i<input.length(); i++) {
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char ch = input.charAt(i);
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int chx = (int) ch;
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// let's not put any nulls in our strings
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if(chx == 0) {
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continue;
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}
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if(ch == '\n') {
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output.append("\\n");
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} else if(ch == '\t') {
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output.append("\\t");
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} else if(ch == '\r') {
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output.append("\\r");
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} else if(ch == '\\') {
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output.append("\\\\");
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} else if(ch == '"') {
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output.append("\\\"");
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} else if(ch == '\b') {
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output.append("\\b");
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} else if(ch == '\f') {
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output.append("\\f");
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} else if(chx > 127) {
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output.append(String.format("\\u%04x", chx));
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} else {
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output.append(ch);
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}
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}
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return output.toString();
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}
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public static String decode(String input) {
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StringBuilder builder = new StringBuilder();
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int i = 0;
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while (i < input.length()) {
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char delimiter = input.charAt(i); i++; // consume letter or backslash
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if(delimiter == '\\' && i < input.length()) {
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// consume first after backslash
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char ch = input.charAt(i); i++;
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if(ch == '\\' || ch == '/' || ch == '"' || ch == '\'') {
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builder.append(ch);
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}
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else if(ch == 'n') builder.append('\n');
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else if(ch == 'r') builder.append('\r');
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else if(ch == 't') builder.append('\t');
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else if(ch == 'b') builder.append('\b');
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else if(ch == 'f') builder.append('\f');
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else if(ch == 'u') {
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StringBuilder hex = new StringBuilder();
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// expect 4 digits
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if (i+4 > input.length()) {
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throw new RuntimeException("Not enough unicode digits! ");
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}
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for (char x : input.substring(i, i + 4).toCharArray()) {
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if(!Character.isLetterOrDigit(x)) {
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throw new RuntimeException("Bad character in unicode escape.");
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}
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hex.append(Character.toLowerCase(x));
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}
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i+=4; // consume those four digits.
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int code = Integer.parseInt(hex.toString(), 16);
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builder.append((char) code);
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} else {
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throw new RuntimeException("Illegal escape sequence: \\"+ch);
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}
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} else { // it's not a backslash, or it's the last character.
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builder.append(delimiter);
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}
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}
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return builder.toString();
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}
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}
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