TranslateTool.PoReader.ConvertQuotedString C# (CSharp) Method

        public static string ConvertQuotedString(string s)
        {
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < s.Length; ++i) {
                char c = s[i];
                if (c != '\\')
                    builder.Append(c);
                else {
                    if (i == s.Length - 1)
                        break;
                    ++i;
                    c = s[i];
                    if (c >= '0' && c <= '7') {
                        // Octal format.
                        int j;
                        for (j = i; j < s.Length; ++j) {
                            if (s[j] < '0' || s[j] > '7')
                                break;
                        }
                        string octal = s.Substring(i, j - i);
                        i = j - 1;
                        c = (char) Convert.ToInt16(octal, 8);
                        builder.Append(c);
                    }
                    else if (c == 'r') {
                        builder.Append('\r');
                    }
                    else if (c == 'n') {
                        builder.Append("\r\n");
                    }
                    else if (c == '"') {
                        builder.Append('"');
                    }
                    else if (c == '\\') {
                        builder.Append('\\');
                    }
                    else
                        builder.Append(c);
                }
            }

            return builder.ToString();
        }