public static CBORObject ParseJSONNumber(
string str,
bool integersOnly,
bool positiveOnly,
bool preserveNegativeZero)
{
if (String.IsNullOrEmpty(str))
{
return(null);
}
if (integersOnly)
{
for (var i = 0; i < str.Length; ++i)
{
if (str[i] >= '0' && str[i] <= '9' && (i > 0 || str[i] != '-'))
{
return(null);
}
}
}
JSONOptions jo = preserveNegativeZero ? PreserveNegZeroYes :
PreserveNegZeroNo;
return((positiveOnly && str[0] == '-') ? null :
ParseJSONNumber(str,
0,
str.Length,
jo));
}
internal static CBORObject ParseSmallNumber(int digit, JSONOptions
options)
{
#if DEBUG
if (digit < 0)
{
throw new ArgumentException("digit (" + digit + ") is not greater" +
"\u0020or equal to 0");
}
#endif
if (options != null && options.NumberConversion ==
JSONOptions.ConversionMode.Double)
{
return(CBORObject.FromObject((double)digit));
}
else if (options != null && options.NumberConversion ==
JSONOptions.ConversionMode.Decimal128)
{
return(CBORObject.FromObject(EDecimal.FromInt32(digit)));
}
else
{
// NOTE: Assumes digit is nonnegative, so PreserveNegativeZeros is irrelevant
return(CBORObject.FromObject(digit));
}
}
/// <summary>Parses a number whose format follows the JSON
/// specification (RFC 8259) and converts that number to a CBOR
/// object.</summary>
/// <param name='str'>A text string to parse as a JSON number.</param>
/// <param name='offset'>An index, starting at 0, showing where the
/// desired portion of <paramref name='str'/> begins.</param>
/// <param name='count'>The length, in code units, of the desired
/// portion of <paramref name='str'/> (but not more than <paramref
/// name='str'/> 's length).</param>
/// <param name='options'>An object containing options to control how
/// JSON numbers are decoded to CBOR objects. Can be null, in which
/// case a JSONOptions object with all default properties is used
/// instead.</param>
/// <returns>A CBOR object that represents the parsed number. Returns
/// null if the parsing fails, including if the string is null or empty
/// or <paramref name='count'/> is 0 or less.</returns>
/// <exception cref='ArgumentNullException'>The parameter <paramref
/// name='str'/> is null.</exception>
/// <exception cref='ArgumentException'>Unsupported conversion
/// kind.</exception>
/// <remarks>Roughly speaking, a valid JSON number consists of an
/// optional minus sign, one or more basic digits (starting with 1 to 9
/// unless there is only one digit and that digit is 0), an optional
/// decimal point (".", full stop) with one or more basic digits, and
/// an optional letter E or e with an optional plus or minus sign and
/// one or more basic digits (the exponent). A string representing a
/// valid JSON number is not allowed to contain white space characters,
/// including spaces.</remarks>
public static CBORObject ParseJSONNumber(
string str,
int offset,
int count,
JSONOptions options)
{
return(ParseJSONNumber(str, offset, count, options, null));
}
public CBORJson(CharacterInputWithCount reader, JSONOptions options)
{
this.reader = reader;
this.sb = null;
this.options = options;
this.jsonSequenceMode = false;
this.recordSeparatorSeen = false;
}
internal static CBORObject ParseJSONValue(
CharacterInputWithCount reader,
JSONOptions options,
int[] nextChar)
{
var cj = new CBORJson(reader, options);
return(cj.ParseJSON(nextChar));
}
/// <summary>Parses a number whose format follows the JSON
/// specification (RFC 8259) and converts that number to a CBOR
/// object.</summary>
/// <param name='str'>A text string to parse as a JSON number.</param>
/// <param name='options'>An object containing options to control how
/// JSON numbers are decoded to CBOR objects. Can be null, in which
/// case a JSONOptions object with all default properties is used
/// instead.</param>
/// <returns>A CBOR object that represents the parsed number. Returns
/// null if the parsing fails, including if the string is null or
/// empty.</returns>
/// <remarks>Roughly speaking, a valid JSON number consists of an
/// optional minus sign, one or more basic digits (starting with 1 to 9
/// unless there is only one digit and that digit is 0), an optional
/// decimal point (".", full stop) with one or more basic digits, and
/// an optional letter E or e with an optional plus or minus sign and
/// one or more basic digits (the exponent). A string representing a
/// valid JSON number is not allowed to contain white space characters,
/// including spaces.</remarks>
public static CBORObject ParseJSONNumber(
string str,
JSONOptions options)
{
return(String.IsNullOrEmpty(str) ? null :
ParseJSONNumber(str,
0,
str.Length,
options));
}
internal static void WriteJSONToInternal(
CBORObject obj,
StringOutput writer,
JSONOptions options)
{
if (obj.Type == CBORType.Array || obj.Type == CBORType.Map)
{
var stack = new List <CBORObject>();
WriteJSONToInternal(obj, writer, options, stack);
}
else
{
WriteJSONToInternal(obj, writer, options, null);
}
}
internal static CBORObject ParseJSONValue(
byte[] bytes,
int index,
int endPos,
JSONOptions options)
{
var nextchar = new int[1];
var cj = new CBORJson2(bytes, index, endPos, options);
CBORObject obj = cj.ParseJSON(nextchar);
if (nextchar[0] != -1)
{
cj.RaiseError("End of bytes not reached");
}
return(obj);
}
internal static CBORObject ParseJSONValue(
byte[] bytes,
int index,
int endPos,
JSONOptions options,
int[] nextchar)
{
#if DEBUG
if (bytes == null)
{
throw new ArgumentNullException(nameof(bytes));
}
if (index < 0)
{
throw new ArgumentException("index (" + index + ") is not greater or" +
"\u0020equal to 0");
}
if (index > bytes.Length)
{
throw new ArgumentException("index (" + index + ") is not less or" +
"\u0020equal to " + bytes.Length);
}
if (endPos < 0)
{
throw new ArgumentException("endPos (" + endPos + ") is not greater" +
"\u0020or equal to 0");
}
if (endPos > bytes.Length)
{
throw new ArgumentException("endPos (" + endPos + ") is not less or" +
"\u0020equal to " + bytes.Length);
}
if (endPos < index)
{
throw new ArgumentException("endPos (" + endPos + ") is not greater" +
"\u0020or equal to " + index);
}
#endif
var cj = new CBORJson2(bytes, index, endPos, options);
return(cj.ParseJSON(nextchar));
}
public CBORJson2(byte[] bytes, int index, int endPos, JSONOptions
options)
{
#if DEBUG
if (bytes == null)
{
throw new ArgumentNullException(nameof(bytes));
}
if (index < 0)
{
throw new ArgumentException("index (" + index + ") is not greater or" +
"\u0020equal to 0");
}
if (index > bytes.Length)
{
throw new ArgumentException("index (" + index + ") is not less or" +
"\u0020equal to " + bytes.Length);
}
if (endPos < 0)
{
throw new ArgumentException("endPos (" + endPos + ") is not greater" +
"\u0020or equal to 0");
}
if (endPos > bytes.Length)
{
throw new ArgumentException("endPos (" + endPos + ") is not less or" +
"\u0020equal to " + bytes.Length);
}
if (endPos < index)
{
throw new ArgumentException("endPos (" + endPos + ") is not greater" +
"\u0020or equal to " + index);
}
#endif
this.sb = null;
this.bytes = bytes;
this.index = index;
this.endPos = endPos;
this.options = options;
}
public CBORJson3(string jstring, int index, int endPos, JSONOptions
options)
{
#if DEBUG
if (jstring == null)
{
throw new ArgumentNullException(nameof(jstring));
}
if (index < 0)
{
throw new ArgumentException("index (" + index + ") is not greater or" +
"\u0020equal to 0");
}
if (index > jstring.Length)
{
throw new ArgumentException("index (" + index + ") is not less or" +
"\u0020equal to " + jstring.Length);
}
if (endPos < 0)
{
throw new ArgumentException("endPos (" + endPos + ") is not greater" +
"\u0020or equal to 0");
}
if (endPos > jstring.Length)
{
throw new ArgumentException("endPos (" + endPos + ") is not less or" +
"\u0020equal to " + jstring.Length);
}
if (endPos < index)
{
throw new ArgumentException("endPos (" + endPos + ") is not greater" +
"\u0020or equal to " + index);
}
#endif
this.sb = null;
this.jstring = jstring;
this.index = index;
this.endPos = endPos;
this.options = options;
}
internal static CBORObject ParseJSONNumber(
string str,
int offset,
int count,
JSONOptions options,
int[] endOfNumber)
{
if (String.IsNullOrEmpty(str) || count <= 0)
{
return(null);
}
if (offset < 0 || offset > str.Length)
{
return(null);
}
if (count > str.Length || str.Length - offset < count)
{
return(null);
}
JSONOptions opt = options ?? DefaultOptions;
bool preserveNegativeZero = options.PreserveNegativeZero;
JSONOptions.ConversionMode kind = options.NumberConversion;
int endPos = offset + count;
int initialOffset = offset;
var negative = false;
if (str[initialOffset] == '-')
{
++offset;
negative = true;
}
int numOffset = offset;
var haveDecimalPoint = false;
var haveDigits = false;
var haveDigitsAfterDecimal = false;
var haveExponent = false;
int i = offset;
var decimalPointPos = -1;
// Check syntax
int k = i;
if (endPos - 1 > k && str[k] == '0' && str[k + 1] >= '0' &&
str[k + 1] <= '9')
{
if (endOfNumber != null)
{
endOfNumber[0] = k + 2;
}
return(null);
}
for (; k < endPos; ++k)
{
char c = str[k];
if (c >= '0' && c <= '9')
{
haveDigits = true;
haveDigitsAfterDecimal |= haveDecimalPoint;
}
else if (c == '.')
{
if (!haveDigits || haveDecimalPoint)
{
// no digits before the decimal point,
// or decimal point already seen
if (endOfNumber != null)
{
endOfNumber[0] = k;
}
return(null);
}
haveDecimalPoint = true;
decimalPointPos = k;
}
else if (c == 'E' || c == 'e')
{
++k;
haveExponent = true;
break;
}
else
{
if (endOfNumber != null)
{
endOfNumber[0] = k;
// Check if character can validly appear after a JSON number
if (c != ',' && c != ']' && c != '}' &&
c != 0x20 && c != 0x0a && c != 0x0d && c != 0x09)
{
return(null);
}
else
{
endPos = k;
break;
}
}
return(null);
}
}
if (!haveDigits || (haveDecimalPoint && !haveDigitsAfterDecimal))
{
if (endOfNumber != null)
{
endOfNumber[0] = k;
}
return(null);
}
var exponentPos = -1;
var negativeExp = false;
if (haveExponent)
{
haveDigits = false;
if (k == endPos)
{
if (endOfNumber != null)
{
endOfNumber[0] = k;
}
return(null);
}
char c = str[k];
if (c == '+')
{
++k;
}
else if (c == '-')
{
negativeExp = true;
++k;
}
for (; k < endPos; ++k)
{
c = str[k];
if (c >= '0' && c <= '9')
{
if (exponentPos < 0 && c != '0')
{
exponentPos = k;
}
haveDigits = true;
}
else if (endOfNumber != null)
{
endOfNumber[0] = k;
// Check if character can validly appear after a JSON number
if (c != ',' && c != ']' && c != '}' &&
c != 0x20 && c != 0x0a && c != 0x0d && c != 0x09)
{
return(null);
}
else
{
endPos = k;
break;
}
}
else
{
return(null);
}
}
if (!haveDigits)
{
if (endOfNumber != null)
{
endOfNumber[0] = k;
}
return(null);
}
}
if (endOfNumber != null)
{
endOfNumber[0] = endPos;
}
if (exponentPos >= 0 && endPos - exponentPos > 20)
{
// Exponent too high for precision to overcome (which
// has a length no bigger than Int32.MaxValue, which is 10 digits
// long)
if (negativeExp)
{
// underflow
if (kind == JSONOptions.ConversionMode.Double ||
kind == JSONOptions.ConversionMode.IntOrFloat)
{
if (!negative)
{
return(CBORObject.FromObject((double)0.0));
}
else
{
return(CBORObject.FromFloatingPointBits(0x8000, 2));
}
}
else if (kind ==
JSONOptions.ConversionMode.IntOrFloatFromDouble)
{
return(CBORObject.FromObject(0));
}
}
else
{
// overflow
if (kind == JSONOptions.ConversionMode.Double ||
kind == JSONOptions.ConversionMode.IntOrFloatFromDouble ||
kind == JSONOptions.ConversionMode.IntOrFloat)
{
return(CBORObject.FromObject(
negative ? Double.NegativeInfinity : Double.PositiveInfinity));
}
else if (kind == JSONOptions.ConversionMode.Decimal128)
{
return(CBORObject.FromObject(negative ?
EDecimal.NegativeInfinity : EDecimal.PositiveInfinity));
}
}
}
if (!haveExponent && !haveDecimalPoint &&
(endPos - numOffset) <= 16)
{
// Very common case of all-digit JSON number strings
// less than 2^53 (with or without number sign)
long v = 0L;
int vi = numOffset;
for (; vi < endPos; ++vi)
{
v = (v * 10) + (int)(str[vi] - '0');
}
if ((v != 0 || !negative) && v < (1L << 53) - 1)
{
if (negative)
{
v = -v;
}
if (kind == JSONOptions.ConversionMode.Double)
{
return(CBORObject.FromObject((double)v));
}
else if (kind == JSONOptions.ConversionMode.Decimal128)
{
return(CBORObject.FromObject(EDecimal.FromInt64(v)));
}
else
{
return(CBORObject.FromObject(v));
}
}
}
if (kind == JSONOptions.ConversionMode.Full)
{
if (!haveDecimalPoint && !haveExponent)
{
EInteger ei = EInteger.FromSubstring(str, initialOffset, endPos);
if (preserveNegativeZero && ei.IsZero && negative)
{
// TODO: In next major version, change to EDecimal.NegativeZero
return(CBORObject.FromFloatingPointBits(0x8000, 2));
}
return(CBORObject.FromObject(ei));
}
if (!haveExponent && haveDecimalPoint && (endPos - numOffset) <= 19)
{
// No more than 18 digits plus one decimal point (which
// should fit a long)
long lv = 0L;
int expo = -(endPos - (decimalPointPos + 1));
int vi = numOffset;
for (; vi < decimalPointPos; ++vi)
{
lv = checked ((lv * 10) + (int)(str[vi] - '0'));
}
for (vi = decimalPointPos + 1; vi < endPos; ++vi)
{
lv = checked ((lv * 10) + (int)(str[vi] - '0'));
}
if (negative)
{
lv = -lv;
}
if (!negative || lv != 0)
{
if (expo == 0)
{
return(CBORObject.FromObject(lv));
}
else
{
CBORObject cbor = CBORObject.FromObject(
new CBORObject[] {
CBORObject.FromObject(expo),
CBORObject.FromObject(lv),
});
return(cbor.WithTag(4));
}
}
}
EDecimal ed = EDecimal.FromString(
str,
initialOffset,
endPos - initialOffset);
if (ed.IsZero && negative)
{
if (ed.Exponent.IsZero)
{
// TODO: In next major version, use EDecimal
// for preserveNegativeZero
return(preserveNegativeZero ?
CBORObject.FromFloatingPointBits(0x8000, 2) :
CBORObject.FromObject(0));
}
else if (!preserveNegativeZero)
{
return(CBORObject.FromObject(ed.Negate()));
}
else
{
return(CBORObject.FromObject(ed));
}
}
else
{
return(ed.Exponent.IsZero ? CBORObject.FromObject(ed.Mantissa) :
CBORObject.FromObject(ed));
}
}
else if (kind == JSONOptions.ConversionMode.Double)
{
// TODO: Avoid converting to double
double dbl = EFloat.FromString(
str,
initialOffset,
endPos - initialOffset,
EContext.Binary64).ToDouble();
if (!preserveNegativeZero && dbl == 0.0)
{
dbl = 0.0;
}
return(CBORObject.FromObject(dbl));
}
else if (kind == JSONOptions.ConversionMode.Decimal128)
{
EDecimal ed = EDecimal.FromString(
str,
initialOffset,
endPos - initialOffset,
EContext.Decimal128);
if (!preserveNegativeZero && ed.IsNegative && ed.IsZero)
{
ed = ed.Negate();
}
return(CBORObject.FromObject(ed));
}
else if (kind == JSONOptions.ConversionMode.IntOrFloatFromDouble)
{
// TODO: Avoid converting to double
double dbl = EFloat.FromString(
str,
initialOffset,
endPos - initialOffset,
EContext.Binary64).ToDouble();
if (!Double.IsNaN(dbl) && dbl >= -9007199254740991.0 &&
dbl <= 9007199254740991.0 && Math.Floor(dbl) == dbl)
{
var idbl = (long)dbl;
return(CBORObject.FromObject(idbl));
}
return(CBORObject.FromObject(dbl));
}
else if (kind == JSONOptions.ConversionMode.IntOrFloat)
{
EContext ctx = EContext.Binary64.WithBlankFlags();
// TODO: Avoid converting to double
double dbl = EFloat.FromString(
str,
initialOffset,
endPos - initialOffset,
ctx).ToDouble();
if ((ctx.Flags & EContext.FlagInexact) != 0)
{
// Inexact conversion to double, meaning that the string doesn't
// represent an integer in [-(2^53)+1, 2^53), which is representable
// exactly as double, so treat as ConversionMode.Double
if (!preserveNegativeZero && dbl == 0.0)
{
dbl = 0.0;
}
return(CBORObject.FromObject(dbl));
}
else
{
// Exact conversion; treat as ConversionMode.IntToFloatFromDouble
if (!Double.IsNaN(dbl) && dbl >= -9007199254740991.0 &&
dbl <= 9007199254740991.0 && Math.Floor(dbl) == dbl)
{
var idbl = (long)dbl;
return(CBORObject.FromObject(idbl));
}
return(CBORObject.FromObject(dbl));
}
}
else
{
throw new ArgumentException("Unsupported conversion kind.");
}
}
internal static CBORObject[] ParseJSONSequence(
CharacterInputWithCount reader,
JSONOptions options,
int[] nextChar)
{
var cj = new CBORJson(reader, options);
cj.SetJSONSequenceMode();
bool seenSeparator = cj.SkipRecordSeparators(nextChar, false);
if (nextChar[0] >= 0 && !seenSeparator)
{
// Stream is not empty and did not begin with
// record separator
cj.RaiseError("Not a JSON text sequence");
}
else if (nextChar[0] < 0 && !seenSeparator)
{
// Stream is empty
return(new CBORObject[0]);
}
else if (nextChar[0] < 0)
{
// Stream had only record separators, so we found
// a truncated JSON text
return(new CBORObject[] { null });
}
var list = new List <CBORObject>();
while (true)
{
CBORObject co;
try {
co = cj.ParseJSON(nextChar);
} catch (CBORException) {
cj.SkipToEnd();
co = null;
}
if (co != null && nextChar[0] >= 0)
{
// End of JSON text not reached
cj.SkipToEnd();
co = null;
}
list.Add(co);
if (!cj.recordSeparatorSeen)
{
// End of the stream was reached
nextChar[0] = -1;
break;
}
else
{
// A record separator was seen, so
// another JSON text follows
cj.ResetJSONSequenceMode();
cj.SkipRecordSeparators(nextChar, true);
if (nextChar[0] < 0)
{
// Rest of stream had only record separators, so we found
// a truncated JSON text
list.Add(null);
break;
}
}
}
return((CBORObject[])list.ToArray());
}
internal static void WriteJSONToInternal(
CBORObject obj,
StringOutput writer,
JSONOptions options,
IList <CBORObject> stack)
{
if (obj.IsNumber)
{
writer.WriteString(CBORNumber.FromCBORObject(obj).ToJSONString());
return;
}
switch (obj.Type)
{
case CBORType.Integer:
case CBORType.FloatingPoint: {
CBORObject untaggedObj = obj.Untag();
writer.WriteString(
CBORNumber.FromCBORObject(untaggedObj).ToJSONString());
break;
}
case CBORType.Boolean: {
if (obj.IsTrue)
{
writer.WriteString("true");
return;
}
if (obj.IsFalse)
{
writer.WriteString("false");
return;
}
return;
}
case CBORType.SimpleValue: {
writer.WriteString("null");
return;
}
case CBORType.ByteString: {
byte[] byteArray = obj.GetByteString();
if (byteArray.Length == 0)
{
writer.WriteString("\"\"");
return;
}
writer.WriteCodePoint((int)'\"');
if (obj.HasTag(22))
{
// Base64 with padding
Base64.WriteBase64(
writer,
byteArray,
0,
byteArray.Length,
true);
}
else if (obj.HasTag(23))
{
// Write as base16
for (int i = 0; i < byteArray.Length; ++i)
{
writer.WriteCodePoint((int)Hex16[(byteArray[i] >> 4) & 15]);
writer.WriteCodePoint((int)Hex16[byteArray[i] & 15]);
}
}
else
{
// Base64url no padding
Base64.WriteBase64URL(
writer,
byteArray,
0,
byteArray.Length,
false);
}
writer.WriteCodePoint((int)'\"');
break;
}
case CBORType.TextString: {
string thisString = obj.AsString();
if (thisString.Length == 0)
{
writer.WriteString("\"\"");
return;
}
writer.WriteCodePoint((int)'\"');
WriteJSONStringUnquoted(thisString, writer, options);
writer.WriteCodePoint((int)'\"');
break;
}
case CBORType.Array: {
writer.WriteCodePoint((int)'[');
for (var i = 0; i < obj.Count; ++i)
{
if (i > 0)
{
writer.WriteCodePoint((int)',');
}
bool pop = CheckCircularRef(stack, obj, obj[i]);
WriteJSONToInternal(obj[i], writer, options, stack);
PopRefIfNeeded(stack, pop);
}
writer.WriteCodePoint((int)']');
break;
}
case CBORType.Map: {
var first = true;
var hasNonStringKeys = false;
ICollection <KeyValuePair <CBORObject, CBORObject> > entries =
obj.Entries;
foreach (KeyValuePair <CBORObject, CBORObject> entry in entries)
{
CBORObject key = entry.Key;
if (key.Type != CBORType.TextString ||
key.IsTagged)
{
// treat a non-text-string item or a tagged item
// as having non-string keys
hasNonStringKeys = true;
break;
}
}
if (!hasNonStringKeys)
{
writer.WriteCodePoint((int)'{');
foreach (KeyValuePair <CBORObject, CBORObject> entry in entries)
{
CBORObject key = entry.Key;
CBORObject value = entry.Value;
if (!first)
{
writer.WriteCodePoint((int)',');
}
writer.WriteCodePoint((int)'\"');
WriteJSONStringUnquoted(key.AsString(), writer, options);
writer.WriteCodePoint((int)'\"');
writer.WriteCodePoint((int)':');
bool pop = CheckCircularRef(stack, obj, value);
WriteJSONToInternal(value, writer, options, stack);
PopRefIfNeeded(stack, pop);
first = false;
}
writer.WriteCodePoint((int)'}');
}
else
{
// This map has non-string keys
IDictionary <string, CBORObject> stringMap = new
Dictionary <string, CBORObject>();
// Copy to a map with String keys, since
// some keys could be duplicates
// when serialized to strings
foreach (KeyValuePair <CBORObject, CBORObject> entry
in entries)
{
CBORObject key = entry.Key;
CBORObject value = entry.Value;
string str = null;
switch (key.Type)
{
case CBORType.TextString:
str = key.AsString();
break;
case CBORType.Array:
case CBORType.Map: {
var sb = new StringBuilder();
var sw = new StringOutput(sb);
bool pop = CheckCircularRef(stack, obj, key);
WriteJSONToInternal(key, sw, options, stack);
PopRefIfNeeded(stack, pop);
str = sb.ToString();
break;
}
default: str = key.ToJSONString(options);
break;
}
if (stringMap.ContainsKey(str))
{
throw new CBORException(
"Duplicate JSON string equivalents of map" +
"\u0020keys");
}
stringMap[str] = value;
}
first = true;
writer.WriteCodePoint((int)'{');
foreach (KeyValuePair <string, CBORObject> entry in stringMap)
{
string key = entry.Key;
CBORObject value = entry.Value;
if (!first)
{
writer.WriteCodePoint((int)',');
}
writer.WriteCodePoint((int)'\"');
WriteJSONStringUnquoted((string)key, writer, options);
writer.WriteCodePoint((int)'\"');
writer.WriteCodePoint((int)':');
bool pop = CheckCircularRef(stack, obj, value);
WriteJSONToInternal(value, writer, options, stack);
PopRefIfNeeded(stack, pop);
first = false;
}
writer.WriteCodePoint((int)'}');
}
break;
}
default:
throw new InvalidOperationException("Unexpected item" +
"\u0020type");
}
}
internal static void WriteJSONStringUnquoted(
string str,
StringOutput sb,
JSONOptions options)
{
var first = true;
for (var i = 0; i < str.Length; ++i)
{
char c = str[i];
if (c == '\\' || c == '"')
{
if (first)
{
first = false;
sb.WriteString(str, 0, i);
}
sb.WriteCodePoint((int)'\\');
sb.WriteCodePoint((int)c);
}
else if (c < 0x20 || (c >= 0x7f && (c == 0x2028 || c == 0x2029 ||
(c >= 0x7f && c <= 0xa0) || c == 0xfeff || c == 0xfffe ||
c == 0xffff)))
{
// Control characters, and also the line and paragraph separators
// which apparently can't appear in JavaScript (as opposed to
// JSON) strings
if (first)
{
first = false;
sb.WriteString(str, 0, i);
}
if (c == 0x0d)
{
sb.WriteString("\\r");
}
else if (c == 0x0a)
{
sb.WriteString("\\n");
}
else if (c == 0x08)
{
sb.WriteString("\\b");
}
else if (c == 0x0c)
{
sb.WriteString("\\f");
}
else if (c == 0x09)
{
sb.WriteString("\\t");
}
else if (c == 0x85)
{
sb.WriteString("\\u0085");
}
else if (c >= 0x100)
{
sb.WriteString("\\u");
sb.WriteCodePoint((int)Hex16[(int)((c >> 12) & 15)]);
sb.WriteCodePoint((int)Hex16[(int)((c >> 8) & 15)]);
sb.WriteCodePoint((int)Hex16[(int)((c >> 4) & 15)]);
sb.WriteCodePoint((int)Hex16[(int)(c & 15)]);
}
else
{
sb.WriteString("\\u00");
sb.WriteCodePoint((int)Hex16[(int)(c >> 4)]);
sb.WriteCodePoint((int)Hex16[(int)(c & 15)]);
}
}
else
{
if ((c & 0xfc00) == 0xd800)
{
if (i >= str.Length - 1 || (str[i + 1] & 0xfc00) != 0xdc00)
{
// NOTE: RFC 8259 doesn't prohibit any particular
// error-handling behavior when a writer of JSON
// receives a string with an unpaired surrogate.
if (options.ReplaceSurrogates)
{
if (first)
{
first = false;
sb.WriteString(str, 0, i);
}
// Replace unpaired surrogate with U+FFFD
c = (char)0xfffd;
}
else
{
throw new CBORException("Unpaired surrogate in string");
}
}
}
if (!first)
{
if ((c & 0xfc00) == 0xd800)
{
sb.WriteString(str, i, 2);
++i;
}
else
{
sb.WriteCodePoint((int)c);
}
}
}
}
if (first)
{
sb.WriteString(str);
}
}