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/* Copyright (c) 2008-2011 - Eric P. Mangold
* Released under the terms of the MIT/X11 license - see LICENSE.txt */
using System;
using System.Text;
using System.Collections;
using System.Collections.Generic;
namespace AMP
{
// TODO implement AMPList
public interface IAmpType
{
byte[] ToAmpBytes(Object obj);
Object FromAmpBytes(byte[] bytes);
}
namespace Type
{
/// <summary>
/// Encoder/Decoder for .NET `string' type
/// </summary>
public class String : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
return Encoding.UTF8.GetBytes((string)obj);
}
public Object FromAmpBytes(byte[] bytes)
{
return Encoding.UTF8.GetString(bytes);
}
}
/// <summary>
/// Encoder/Decoder for .NET `byte[]' type
/// </summary>
public class Bytes : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
return (byte[])obj;
}
public Object FromAmpBytes(byte[] bytes)
{
return bytes;
}
}
/// <summary>
/// Encoder/Decoder for .NET `bool' type
/// </summary>
public class Bool : IAmpType
{
private byte[] TRUE = Encoding.UTF8.GetBytes("True");
private byte[] FALSE = Encoding.UTF8.GetBytes("False");
public byte[] ToAmpBytes(Object obj)
{
return (bool)obj ? TRUE : FALSE;
}
public Object FromAmpBytes(byte[] bytes)
{
if (BytesUtil.AreEqual(TRUE, bytes))
{
return true;
}
if (BytesUtil.AreEqual(FALSE, bytes))
{
return false;
}
/// XXX If this throws it blows up when passing this error across thread boundaries
/// with SerializationException. test_AMP_error will demonstrate if you
/// change this method to always throw
throw new Error.TypeDecodeError();
}
}
/// <summary>
/// Encoder/Decoder for .NET `int' type
/// </summary>
public class Int32 : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
return Encoding.UTF8.GetBytes(((int)obj).ToString());
}
public Object FromAmpBytes(byte[] bytes)
{
return System.Int32.Parse(Encoding.UTF8.GetString(bytes));
}
}
/// <summary>
/// Encoder/Decoder for .NET `uint' type
/// </summary>
public class UInt32 : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
return Encoding.UTF8.GetBytes(((uint)obj).ToString());
}
public Object FromAmpBytes(byte[] bytes)
{
return System.UInt32.Parse(Encoding.UTF8.GetString(bytes));
}
}
/// <summary>
/// Encoder/Decoder for .NET `long' type
/// </summary>
public class Int64 : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
return Encoding.UTF8.GetBytes(((long)obj).ToString());
}
public Object FromAmpBytes(byte[] bytes)
{
return System.Int64.Parse(Encoding.UTF8.GetString(bytes));
}
}
/// <summary>
/// Encoder/Decoder for .NET `ulong' type
/// </summary>
public class UInt64 : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
return Encoding.UTF8.GetBytes(((ulong)obj).ToString());
}
public Object FromAmpBytes(byte[] bytes)
{
return System.UInt64.Parse(Encoding.UTF8.GetString(bytes));
}
}
/// <summary>
/// Encoder/Decoder for .NET `decimal' type
/// </summary>
public class Decimal : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
return Encoding.UTF8.GetBytes(((decimal)obj).ToString());
}
public Object FromAmpBytes(byte[] bytes)
{
string s = Encoding.UTF8.GetString(bytes);
string[] parts = s.Split('E'); // might use Engineering notation
if (parts.Length == 1)
{
return decimal.Parse(s);
}
else if (parts.Length == 2)
{
decimal d = decimal.Parse(parts[0]);
int i = int.Parse(parts[1]);
if (i != 0)
{
decimal factor = (i > 0) ? 10m : 0.1m;
for (int j = Math.Abs(i); j > 0; j--)
{
d *= factor;
}
}
return d;
}
else
{
throw new Error.TypeDecodeError();
}
}
}
/// <summary>
/// Encoder/Decoder for .NET `double' type
/// </summary>
public class Double : IAmpType
{
public static byte[] NAN = Encoding.UTF8.GetBytes("nan");
public static byte[] POSINF = Encoding.UTF8.GetBytes("inf");
public static byte[] NEGINF = Encoding.UTF8.GetBytes("-inf");
static bool arraysEqual(byte[] a, byte[] b)
{
if (a.Length != b.Length)
return false;
int i;
for (i = 0; i < a.Length; i++) {
if (a[i] != b[i])
return false;
}
return true;
}
public byte[] ToAmpBytes(Object obj)
{
double d = (double)obj;
if (double.IsNaN(d)) {
return NAN;
} else if (double.IsPositiveInfinity(d)) {
return POSINF;
} else if (double.IsNegativeInfinity(d)) {
return NEGINF;
} else {
return Encoding.UTF8.GetBytes(d.ToString());
}
}
public Object FromAmpBytes(byte[] bytes)
{
if (arraysEqual(bytes, NAN)) {
return double.NaN;
} else if (arraysEqual(bytes, POSINF)) {
return double.PositiveInfinity;
} else if (arraysEqual(bytes, NEGINF)) {
return double.NegativeInfinity;
} else {
return double.Parse(Encoding.UTF8.GetString(bytes));
}
}
}
/// <summary>
/// Encoder/Decoder for .NET `DateTimeOffset' type, using the standard AMP `DateTime' format.
/// If you wish to send .NET `DateTime' instances over the wire, convert them to a `DateTimeOffset' first.
/// </summary>
public class DateTimeOffset : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
var dt = (System.DateTimeOffset)obj;
var fmt = new System.Globalization.DateTimeFormatInfo();
fmt.TimeSeparator = ":";
string s = dt.ToString("yyyy-MM-ddTHH:mm:ss.ffffffzzz", fmt);
System.Diagnostics.Debug.Assert(s.Length == 32);
return Encoding.UTF8.GetBytes(s);
}
public Object FromAmpBytes(byte[] bytes)
{
// "2012-01-23T12:34:56.054321+01:23"
string s = Encoding.UTF8.GetString(bytes);
System.Diagnostics.Debug.Assert(s.Length == 32);
int year = int.Parse(s.Substring(0, 4));
int month = int.Parse(s.Substring(5, 2));
int day = int.Parse(s.Substring(8, 2));
int hour = int.Parse(s.Substring(11, 2));
int min = int.Parse(s.Substring(14, 2));
int sec = int.Parse(s.Substring(17, 2));
// The AMP spec specifies 6 decimal places for the fractional portion of the seconds.
// But a DateTimeOffset can only hold miliseconds (3 decimal places), so we just
// take the first 3 and ignore the rest.
int miliseconds = int.Parse(s.Substring(20, 3));
string offsetDirection = s.Substring(26, 1);
int offsetHour = int.Parse(s.Substring(27, 2));
int offsetMinute = int.Parse(s.Substring(30, 2));
TimeSpan offset;
if (offsetDirection == "+")
{
offset = new TimeSpan(offsetHour, offsetMinute, 0);
}
else if (offsetDirection == "-")
{
offset = new TimeSpan(offsetHour, offsetMinute, 0).Negate();
}
else
{
throw new AMP.Error.TypeDecodeError();
}
return new System.DateTimeOffset(year, month, day, hour, min, sec, miliseconds, offset);
}
}
/// <summary>
/// Encoder/Decoder for .NET `DateTime' type. Encodes and decodes as UTC - timezone information is not retained.
/// **DEPRECATED** - use Amp.Type.DateTimeOffset
/// </summary>
public class TimeArgument : IAmpType
{
public byte[] ToAmpBytes(Object obj)
{
DateTime dt = ((DateTime)obj).ToUniversalTime();
string s = dt.ToString("yyyy/M/d HH:mm:ss");
return Encoding.UTF8.GetBytes(s);
}
public Object FromAmpBytes(byte[] bytes)
{
string s = Encoding.UTF8.GetString(bytes);
string[] parts = s.Split(' ');
string[] date_parts = parts[0].Split('/');
string[] time_parts = parts[1].Split(':');
int year = int.Parse(date_parts[0]);
int month = int.Parse(date_parts[1]);
int day = int.Parse(date_parts[2]);
int hour = int.Parse(time_parts[0]);
int min = int.Parse(time_parts[1]);
int sec = int.Parse(time_parts[2]);
var dt = new DateTime(year, month, day, hour, min, sec, DateTimeKind.Utc);
return dt;
}
}
/// <summary>
/// Encoder/Decoder for a List of one of the other IAmpType classes
/// e.g. new ListOf(new AMP.Type.String())
/// </summary>
public class ListOf : IAmpType
{
private IAmpType listType;
public ListOf(IAmpType type)
{
listType = type;
}
public byte[] ToAmpBytes(Object obj)
{
var chunks = new List<byte[]>();
byte[] chunkLen;
byte[] chunk;
byte[] result;
int totalLen = 0;
if (BitConverter.IsLittleEndian)
{
foreach (Object item in (IEnumerable)obj)
{
chunk = listType.ToAmpBytes(item);
totalLen += chunk.Length + 2;
chunkLen = BitConverter.GetBytes((UInt16)chunk.Length);
// XOR SWAP the bytes because we're on little-endian but the value
// needs to be in big-endian order.
chunkLen[0] ^= chunkLen[1];
chunkLen[1] ^= chunkLen[0];
chunkLen[0] ^= chunkLen[1];
chunks.Add(chunkLen);
chunks.Add(chunk);
}
}
else
{
foreach (Object item in (IEnumerable)obj)
{
chunk = listType.ToAmpBytes(item);
totalLen += chunk.Length + 2;
chunkLen = BitConverter.GetBytes((UInt16)chunk.Length);
chunks.Add(chunkLen);
chunks.Add(chunk);
}
}
result = new byte[totalLen];
// blit each sub-array to the result array
int i = 0;
foreach (byte[] c in chunks)
{
c.CopyTo(result, i);
i += c.Length;
}
return result;
}
public Object FromAmpBytes(byte[] bytes)
{
int idx = 0;
byte[] chunkLen = new byte[2];
int chunkLenInt;
var result = new List<Object>();
while (idx < bytes.Length)
{
// got 2 bytes remaining at least?
if (bytes.Length - idx < 2)
{
throw new Error.TypeDecodeError();
}
// read the length prefix
chunkLen[0] = bytes[idx];
chunkLen[1] = bytes[idx + 1];
idx += 2;
if (BitConverter.IsLittleEndian)
{
// on a little-endian machine, but value is in big-endian, so
// XOR SWAP bytes before decoding integer
chunkLen[0] ^= chunkLen[1];
chunkLen[1] ^= chunkLen[0];
chunkLen[0] ^= chunkLen[1];
}
chunkLenInt = BitConverter.ToUInt16(chunkLen, 0);
// We *should* have at least chunkLenInt bytes remaining in the array...
if (bytes.Length - idx < chunkLenInt)
{
throw new Error.TypeDecodeError();
}
var tmp = new byte[chunkLenInt];
Array.Copy(bytes, idx, tmp, 0, chunkLenInt);
idx += chunkLenInt;
result.Add(listType.FromAmpBytes(tmp));
}
return result;
}
}
/// <summary>
/// Encoder/Decoder for a List of AMP messages. E.g.
/// <code>
/// var aList = new AMP.Type.AmpList();
/// aList.AddParameter("full_name", new AMP.Type.String());
/// aList.AddParameter("age", new AMP.Type.Int32());
/// </code>
/// Then each item of the List that you send or receive using aList
/// will be an AMP.Msg containing a "full_name" and an "age" key
/// with values of the appropriate type (though casted to Object for
/// storage in an AMP.Msg)
/// </summary>
public class AmpList : IAmpType
{
// A customized Protocol for parsing and accumulating AMP boxes
private class SubParser : Protocol
{
private List<Msg_Raw> msgs;
public SubParser(List<Msg_Raw> msgs)
: base()
{
this.msgs = msgs;
}
internal override void ProcessFullMessage(Msg_Raw raw_msg)
{
msgs.Add(raw_msg);
}
}
private Command cmd;
public AmpList()
{
// The Command class wasn't really meant to help us parse nested AMP messages
// but it's flexible enough to do so without being refactored, so who am I to argue?
cmd = new Command();
}
public void AddParameter(string keyName, IAmpType type)
{
cmd.AddArgument(keyName, type);
}
public byte[] ToAmpBytes(Object obj)
{
var chunks = new List<byte[]>();
byte[] chunk;
Msg_Raw raw_msg;
int totalLen = 0;
var msgs = (IEnumerable<Msg>)obj;
foreach (Msg msg in msgs)
{
raw_msg = cmd.ToRawMessage(msg, MsgType.REQUEST);
chunk = Protocol.BuildAMPWireCommand(raw_msg);
totalLen += chunk.Length;
chunks.Add(chunk);
}
var result = new byte[totalLen];
// blit each sub-array to the result array
int i = 0;
foreach (byte[] c in chunks)
{
c.CopyTo(result, i);
i += c.Length;
}
return result;
}
public Object FromAmpBytes(byte[] bytes)
{
var msgs = new List<Msg_Raw>();
var subParser = new SubParser(msgs);
var result = new List<Msg>();
subParser.DataReceived(bytes);
Msg typedMsg;
foreach (Msg_Raw raw in msgs)
{
typedMsg = cmd.ToTypedMessage(raw, MsgType.REQUEST);
result.Add(typedMsg);
}
return result;
}
}
}
}
|
