GetPreambleLength()

static int System.Net.Http.HttpContent.GetPreambleLength ( ArraySegment< byte > buffer, Encoding encoding )

inlinestaticprivateinherited

Definition at line 764 of file HttpContent.cs.

    {
        byte[] array = buffer.Array;
        int offset = buffer.Offset;
        int count = buffer.Count;
        switch (encoding.CodePage)
        {
        case 65001:
            if (count < 3 || array[offset] != 239 || array[offset + 1] != 187 || array[offset + 2] != 191)
            {
                return 0;
            }
            return 3;
        case 12000:
            if (count < 4 || array[offset] != byte.MaxValue || array[offset + 1] != 254 || array[offset + 2] != 0 || array[offset + 3] != 0)
            {
                return 0;
            }
            return 4;
        case 1200:
            if (count < 2 || array[offset] != byte.MaxValue || array[offset + 1] != 254)
            {
                return 0;
            }
            return 2;
        case 1201:
            if (count < 2 || array[offset] != 254 || array[offset + 1] != byte.MaxValue)
            {
                return 0;
            }
            return 2;
        default:
        {
            byte[] preamble = encoding.GetPreamble();
            if (!BufferHasPrefix(buffer, preamble))
            {
                return 0;
            }
            return preamble.Length;
        }
        }
    }

References System.array, System.buffer, System.Net.Http.HttpContent.BufferHasPrefix(), System.Text.Encoding.CodePage, System.count, System.Text.Encoding.GetPreamble(), and System.offset.

Referenced by System.Net.Http.HttpContent.ReadBufferAsString().