67 lines
1.7 KiB
C#
67 lines
1.7 KiB
C#
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namespace Uwaa.HTTP;
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/// <summary>
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/// Helper methods for HTTP.
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/// </summary>
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public static class HttpHelpers
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{
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/// <summary>
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/// Parses an array of MIME types from an Accept field.
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/// </summary>
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public static MIMEType[] ParseAccept(string accept)
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{
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int count = 1;
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for (int i = 0; i < accept.Length; i++)
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if (accept[i] == ',')
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count++;
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MIMEType[] result = new MIMEType[count];
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int resultIndex = 0;
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int splStart = 0;
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int splEnd = 0;
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void flush()
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{
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try
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{
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result[resultIndex++] = new MIMEType(accept.AsSpan(splStart..(splEnd + 1)));
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}
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catch (FormatException e)
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{
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throw new HttpException(e.Message, e);
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}
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}
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for (int i = 0; i < accept.Length; i++)
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{
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switch (accept[i])
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{
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case ';':
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flush();
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//Another stupid idea by the W3C. Not interested in implementing it - skip!!!
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while (i < accept.Length && accept[i] != ',')
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i++;
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splStart = i + 1;
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continue;
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case ',':
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flush();
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splStart = i + 1;
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continue;
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case ' ':
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if (splEnd <= splStart)
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splStart = i + 1; //Trim start
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continue; //Trim end
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default:
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splEnd = i;
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continue;
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}
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}
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if (splStart < splEnd)
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flush(); //Flush remaining
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return result;
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}
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}
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