internal static int GetRangeItemLength(string input, int startIndex, out RangeItemHeaderValue parsedValue)
{
Contract.Requires(startIndex >= 0);
// This parser parses number ranges: e.g. '1-2', '1-', '-2'.
parsedValue = null;
if (string.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return(0);
}
// Caller must remove leading whitespaces. If not, we'll return 0.
int current = startIndex;
// Try parse the first value of a value pair.
int fromStartIndex = current;
int fromLength = HttpRuleParser.GetNumberLength(input, current, false);
if (fromLength > HttpRuleParser.MaxInt64Digits)
{
return(0);
}
current = current + fromLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
// Afer the first value, the '-' character must follow.
if ((current == input.Length) || (input[current] != '-'))
{
// We need a '-' character otherwise this can't be a valid range.
return(0);
}
current++; // skip the '-' character
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
int toStartIndex = current;
int toLength = 0;
// If we didn't reach the end of the string, try parse the second value of the range.
if (current < input.Length)
{
toLength = HttpRuleParser.GetNumberLength(input, current, false);
if (toLength > HttpRuleParser.MaxInt64Digits)
{
return(0);
}
current = current + toLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
}
if ((fromLength == 0) && (toLength == 0))
{
return(0); // At least one value must be provided in order to be a valid range.
}
// Try convert first value to int64
long from = 0;
if ((fromLength > 0) && !HeaderUtilities.TryParseInt64(input.Substring(fromStartIndex, fromLength), out from))
{
return(0);
}
// Try convert second value to int64
long to = 0;
if ((toLength > 0) && !HeaderUtilities.TryParseInt64(input.Substring(toStartIndex, toLength), out to))
{
return(0);
}
// 'from' must not be greater than 'to'
if ((fromLength > 0) && (toLength > 0) && (from > to))
{
return(0);
}
parsedValue = new RangeItemHeaderValue((fromLength == 0 ? (long?)null : (long?)from),
(toLength == 0 ? (long?)null : (long?)to));
return(current - startIndex);
}
/// <summary>确定指定的 <see cref="T:System.Object" /> 是否等于当前的 <see cref="T:System.Net.Http.Headers.MediaTypeHeaderValue" /> 对象。</summary>
/// <param name="obj">要与当前对象进行比较的对象。</param>
/// <returns>如果指定的 <see cref="T:System.Object" /> 等于当前的对象，则为 <see langword="true" />；否则为 <see langword="false" />。</returns>
public override bool Equals(object obj)
{
return(obj is MediaTypeHeaderValue mediaTypeHeaderValue && string.Equals(this._mediaType, mediaTypeHeaderValue._mediaType, StringComparison.OrdinalIgnoreCase) && HeaderUtilities.AreEqualCollections <NameValueHeaderValue>(this._parameters, mediaTypeHeaderValue._parameters));
}
public override void Validate(string item) => HeaderUtilities.CheckValidToken(item, nameof(item));
private static void CheckNameValueFormat(string name, string?value)
{
HeaderUtilities.CheckValidToken(name, nameof(name));
CheckValueFormat(value);
}
private static void CheckIsValidToken(string item)
{
HeaderUtilities.CheckValidToken(item, nameof(item));
}
internal static int GetRetryConditionLength(string?input, int startIndex, out object?parsedValue)
{
Debug.Assert(startIndex >= 0);
parsedValue = null;
if (string.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return(0);
}
int current = startIndex;
// Caller must remove leading whitespace.
DateTimeOffset date = DateTimeOffset.MinValue;
int deltaSeconds = -1; // use -1 to indicate that the value was not set. 'delta' values are always >=0
// We either have a timespan or a date/time value. Determine which one we have by looking at the first char.
// If it is a number, we have a timespan, otherwise we assume we have a date.
char firstChar = input[current];
if ((firstChar >= '0') && (firstChar <= '9'))
{
int deltaStartIndex = current;
int deltaLength = HttpRuleParser.GetNumberLength(input, current, false);
// The value must be in the range 0..2^31
if ((deltaLength == 0) || (deltaLength > HttpRuleParser.MaxInt32Digits))
{
return(0);
}
current = current + deltaLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
// RetryConditionHeaderValue only allows 1 value. There must be no delimiter/other chars after 'delta'
if (current != input.Length)
{
return(0);
}
if (!HeaderUtilities.TryParseInt32(input, deltaStartIndex, deltaLength, out deltaSeconds))
{
return(0); // int.TryParse() may return 'false' if the value has 10 digits and is > Int32.MaxValue.
}
}
else
{
if (!HttpDateParser.TryParse(input.AsSpan(current), out date))
{
return(0);
}
// If we got a valid date, then the parser consumed the whole string (incl. trailing whitespace).
current = input.Length;
}
RetryConditionHeaderValue result = new RetryConditionHeaderValue();
if (deltaSeconds == -1) // we didn't change delta, so we must have found a date.
{
result._date = date;
}
else
{
result._delta = new TimeSpan(0, 0, deltaSeconds);
}
parsedValue = result;
return(current - startIndex);
}
private static void CheckNameValueFormat(string name, string value)
{
HeaderUtilities.CheckValidToken(name, "name");
NameValueHeaderValue.CheckValueFormat(value);
}
internal static bool AreEqualCollections <T>(ObjectCollection <T> x, ObjectCollection <T> y) where T : class
{
return(HeaderUtilities.AreEqualCollections <T>(x, y, (IEqualityComparer <T>)null));
}
public TransferCodingHeaderValue(string value)
{
HeaderUtilities.CheckValidToken(value, nameof(value));
_value = value;
}
public AuthenticationHeaderValue(string scheme, string?parameter)
{
HeaderUtilities.CheckValidToken(scheme, nameof(scheme));
_scheme = scheme;
_parameter = parameter;
}
public ProductInfoHeaderValue(string comment)
{
HeaderUtilities.CheckValidComment(comment, "comment");
this.comment = comment;
}
private static void ValidateToken(HttpHeaderValueCollection <string> collection, string value)
{
HeaderUtilities.CheckValidToken(value, "item");
}
internal static bool TryParseInt32(string value, out int result)
{
return(HeaderUtilities.TryParseInt32(value, 0, value.Length, out result));
}
public ProductInfoHeaderValue(string comment)
{
HeaderUtilities.CheckValidComment(comment, nameof(comment));
_comment = comment;
}
private static bool TrySetOptionalTokenList(NameValueHeaderValue nameValue, ref bool boolField,
ref ObjectCollection <string> destination)
{
Debug.Assert(nameValue != null);
if (nameValue.Value == null)
{
boolField = true;
return(true);
}
// We need the string to be at least 3 chars long: 2x quotes and at least 1 character. Also make sure we
// have a quoted string. Note that NameValueHeaderValue will never have leading/trailing whitespace.
string valueString = nameValue.Value;
if ((valueString.Length < 3) || (valueString[0] != '\"') || (valueString[valueString.Length - 1] != '\"'))
{
return(false);
}
// We have a quoted string. Now verify that the string contains a list of valid tokens separated by ','.
int current = 1; // skip the initial '"' character.
int maxLength = valueString.Length - 1; // -1 because we don't want to parse the final '"'.
bool separatorFound = false;
int originalValueCount = destination == null ? 0 : destination.Count;
while (current < maxLength)
{
current = HeaderUtilities.GetNextNonEmptyOrWhitespaceIndex(valueString, current, true,
out separatorFound);
if (current == maxLength)
{
break;
}
int tokenLength = HttpRuleParser.GetTokenLength(valueString, current);
if (tokenLength == 0)
{
// We already skipped whitespace and separators. If we don't have a token it must be an invalid
// character.
return(false);
}
if (destination == null)
{
destination = new ObjectCollection <string>(s_checkIsValidToken);
}
destination.Add(valueString.Substring(current, tokenLength));
current = current + tokenLength;
}
// After parsing a valid token list, we expect to have at least one value
if ((destination != null) && (destination.Count > originalValueCount))
{
boolField = true;
return(true);
}
return(false);
}
public StringWithQualityHeaderValue(string value)
{
HeaderUtilities.CheckValidToken(value, "value");
_value = value;
}
public TransferCodingHeaderValue(string value)
{
HeaderUtilities.CheckValidToken(value, "value");
this.value = value;
}