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Copy pathDataConverter.cs
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DataConverter.cs
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//
// Authors:
// Miguel de Icaza ([email protected])
//
// See the following url for documentation:
// http://www.mono-project.com/Mono_DataConvert
//
// Compilation Options:
// MONO_DATACONVERTER_PUBLIC:
// Makes the class public instead of the default internal.
//
// MONO_DATACONVERTER_STATIC_METHODS:
// Exposes the public static methods.
//
// TODO:
// Support for "DoubleWordsAreSwapped" for ARM devices
//
// Copyright (C) 2006 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Text;
#pragma warning disable 3021
namespace Mono {
unsafe public abstract class DataConverter {
static DataConverter SwapConv = new SwapConverter ();
static DataConverter CopyConv = new CopyConverter ();
public static readonly bool IsLittleEndian = BitConverter.IsLittleEndian;
public abstract double GetDouble (byte [] data, int index);
public abstract float GetFloat (byte [] data, int index);
public abstract long GetInt64 (byte [] data, int index);
public abstract int GetInt32 (byte [] data, int index);
public abstract short GetInt16 (byte [] data, int index);
[CLSCompliant (false)]
public abstract uint GetUInt32 (byte [] data, int index);
[CLSCompliant (false)]
public abstract ushort GetUInt16 (byte [] data, int index);
[CLSCompliant (false)]
public abstract ulong GetUInt64 (byte [] data, int index);
public abstract void PutBytes (byte [] dest, int destIdx, double value);
public abstract void PutBytes (byte [] dest, int destIdx, float value);
public abstract void PutBytes (byte [] dest, int destIdx, int value);
public abstract void PutBytes (byte [] dest, int destIdx, long value);
public abstract void PutBytes (byte [] dest, int destIdx, short value);
[CLSCompliant (false)]
public abstract void PutBytes (byte [] dest, int destIdx, ushort value);
[CLSCompliant (false)]
public abstract void PutBytes (byte [] dest, int destIdx, uint value);
[CLSCompliant (false)]
public abstract void PutBytes (byte [] dest, int destIdx, ulong value);
public byte[] GetBytes (double value)
{
byte [] ret = new byte [8];
PutBytes (ret, 0, value);
return ret;
}
public byte[] GetBytes (float value)
{
byte [] ret = new byte [4];
PutBytes (ret, 0, value);
return ret;
}
public byte[] GetBytes (int value)
{
byte [] ret = new byte [4];
PutBytes (ret, 0, value);
return ret;
}
public byte[] GetBytes (long value)
{
byte [] ret = new byte [8];
PutBytes (ret, 0, value);
return ret;
}
public byte[] GetBytes (short value)
{
byte [] ret = new byte [2];
PutBytes (ret, 0, value);
return ret;
}
[CLSCompliant (false)]
public byte[] GetBytes (ushort value)
{
byte [] ret = new byte [2];
PutBytes (ret, 0, value);
return ret;
}
[CLSCompliant (false)]
public byte[] GetBytes (uint value)
{
byte [] ret = new byte [4];
PutBytes (ret, 0, value);
return ret;
}
[CLSCompliant (false)]
public byte[] GetBytes (ulong value)
{
byte [] ret = new byte [8];
PutBytes (ret, 0, value);
return ret;
}
static public DataConverter LittleEndian {
get {
return BitConverter.IsLittleEndian ? CopyConv : SwapConv;
}
}
static public DataConverter BigEndian {
get {
return BitConverter.IsLittleEndian ? SwapConv : CopyConv;
}
}
static public DataConverter Native {
get {
return CopyConv;
}
}
static int Align (int current, int align)
{
return ((current + align - 1) / align) * align;
}
class PackContext {
// Buffer
public byte [] buffer;
int next;
public string description;
public int i; // position in the description
public DataConverter conv;
public int repeat;
//
// if align == -1, auto align to the size of the byte array
// if align == 0, do not do alignment
// Any other values aligns to that particular size
//
public int align;
public void Add (byte [] group)
{
//Console.WriteLine ("Adding {0} bytes to {1} (next={2}", group.Length,
// buffer == null ? "null" : buffer.Length.ToString (), next);
if (buffer == null){
buffer = group;
next = group.Length;
return;
}
if (align != 0){
if (align == -1)
next = Align (next, group.Length);
else
next = Align (next, align);
align = 0;
}
if (next + group.Length > buffer.Length){
byte [] nb = new byte [System.Math.Max (next, 16) * 2 + group.Length];
Array.Copy (buffer, nb, buffer.Length);
Array.Copy (group, 0, nb, next, group.Length);
next = next + group.Length;
buffer = nb;
} else {
Array.Copy (group, 0, buffer, next, group.Length);
next += group.Length;
}
}
public byte [] Get ()
{
if (buffer == null)
return new byte [0];
if (buffer.Length != next){
byte [] b = new byte [next];
Array.Copy (buffer, b, next);
return b;
}
return buffer;
}
}
//
// Format includes:
// Control:
// ^ Switch to big endian encoding
// _ Switch to little endian encoding
// % Switch to host (native) encoding
// ! aligns the next data type to its natural boundary (for strings this is 4).
//
// Types:
// s Int16
// S UInt16
// i Int32
// I UInt32
// l Int64
// L UInt64
// f float
// d double
// b byte
// c 1-byte signed character
// C 1-byte unsigned character
// z8 string encoded as UTF8 with 1-byte null terminator
// z6 string encoded as UTF16 with 2-byte null terminator
// z7 string encoded as UTF7 with 1-byte null terminator
// zb string encoded as BigEndianUnicode with 2-byte null terminator
// z3 string encoded as UTF32 with 4-byte null terminator
// z4 string encoded as UTF32 big endian with 4-byte null terminator
// $8 string encoded as UTF8
// $6 string encoded as UTF16
// $7 string encoded as UTF7
// $b string encoded as BigEndianUnicode
// $3 string encoded as UTF32
// $4 string encoded as UTF-32 big endian encoding
// x null byte
//
// Repeats, these are prefixes:
// N a number between 1 and 9, indicates a repeat count (process N items
// with the following datatype
// [N] For numbers larger than 9, use brackets, for example [20]
// * Repeat the next data type until the arguments are exhausted
//
static public byte [] Pack (string description, params object [] args)
{
int argn = 0;
PackContext b = new PackContext ();
b.conv = CopyConv;
b.description = description;
for (b.i = 0; b.i < description.Length; ){
object oarg;
if (argn < args.Length)
oarg = args [argn];
else {
if (b.repeat != 0)
break;
oarg = null;
}
int save = b.i;
if (PackOne (b, oarg)){
argn++;
if (b.repeat > 0){
if (--b.repeat > 0)
b.i = save;
else
b.i++;
} else
b.i++;
} else
b.i++;
}
return b.Get ();
}
static public byte [] PackEnumerable (string description, IEnumerable args)
{
PackContext b = new PackContext ();
b.conv = CopyConv;
b.description = description;
IEnumerator enumerator = args.GetEnumerator ();
bool ok = enumerator.MoveNext ();
for (b.i = 0; b.i < description.Length; ){
object oarg;
if (ok)
oarg = enumerator.Current;
else {
if (b.repeat != 0)
break;
oarg = null;
}
int save = b.i;
if (PackOne (b, oarg)){
ok = enumerator.MoveNext ();
if (b.repeat > 0){
if (--b.repeat > 0)
b.i = save;
else
b.i++;
} else
b.i++;
} else
b.i++;
}
return b.Get ();
}
//
// Packs one datum `oarg' into the buffer `b', using the string format
// in `description' at position `i'
//
// Returns: true if we must pick the next object from the list
//
static bool PackOne (PackContext b, object oarg)
{
int n;
switch (b.description [b.i]){
case '^':
b.conv = BigEndian;
return false;
case '_':
b.conv = LittleEndian;
return false;
case '%':
b.conv = Native;
return false;
case '!':
b.align = -1;
return false;
case 'x':
b.Add (new byte [] { 0 });
return false;
// Type Conversions
case 'i':
b.Add (b.conv.GetBytes (Convert.ToInt32 (oarg)));
break;
case 'I':
b.Add (b.conv.GetBytes (Convert.ToUInt32 (oarg)));
break;
case 's':
b.Add (b.conv.GetBytes (Convert.ToInt16 (oarg)));
break;
case 'S':
b.Add (b.conv.GetBytes (Convert.ToUInt16 (oarg)));
break;
case 'l':
b.Add (b.conv.GetBytes (Convert.ToInt64 (oarg)));
break;
case 'L':
b.Add (b.conv.GetBytes (Convert.ToUInt64 (oarg)));
break;
case 'f':
b.Add (b.conv.GetBytes (Convert.ToSingle (oarg)));
break;
case 'd':
b.Add (b.conv.GetBytes (Convert.ToDouble (oarg)));
break;
case 'b':
b.Add (new byte [] { Convert.ToByte (oarg) });
break;
case 'c':
b.Add (new byte [] { (byte) (Convert.ToSByte (oarg)) });
break;
case 'C':
b.Add (new byte [] { Convert.ToByte (oarg) });
break;
// Repeat acount;
case '1': case '2': case '3': case '4': case '5':
case '6': case '7': case '8': case '9':
b.repeat = ((short) b.description [b.i]) - ((short) '0');
return false;
case '*':
b.repeat = Int32.MaxValue;
return false;
case '[':
int count = -1, j;
for (j = b.i+1; j < b.description.Length; j++){
if (b.description [j] == ']')
break;
n = ((short) b.description [j]) - ((short) '0');
if (n >= 0 && n <= 9){
if (count == -1)
count = n;
else
count = count * 10 + n;
}
}
if (count == -1)
throw new ArgumentException ("invalid size specification");
b.i = j;
b.repeat = count;
return false;
case '$': case 'z':
bool add_null = b.description [b.i] == 'z';
b.i++;
if (b.i >= b.description.Length)
throw new ArgumentException ("$ description needs a type specified", "description");
char d = b.description [b.i];
Encoding e;
switch (d){
case '8':
e = Encoding.UTF8;
n = 1;
break;
case '6':
e = Encoding.Unicode;
n = 2;
break;
case '7':
e = Encoding.UTF7;
n = 1;
break;
case 'b':
e = Encoding.BigEndianUnicode;
n = 2;
break;
case '3':
e = Encoding.GetEncoding (12000);
n = 4;
break;
case '4':
e = Encoding.GetEncoding (12001);
n = 4;
break;
default:
throw new ArgumentException ("Invalid format for $ specifier", "description");
}
if (b.align == -1)
b.align = 4;
b.Add (e.GetBytes (Convert.ToString (oarg)));
if (add_null)
b.Add (new byte [n]);
break;
default:
throw new ArgumentException (String.Format ("invalid format specified `{0}'",
b.description [b.i]));
}
return true;
}
static bool Prepare (byte [] buffer, ref int idx, int size, ref bool align)
{
if (align){
idx = Align (idx, size);
align = false;
}
if (idx + size > buffer.Length){
idx = buffer.Length;
return false;
}
return true;
}
static public IList Unpack (string description, byte [] buffer, int startIndex)
{
DataConverter conv = CopyConv;
ArrayList result = new ArrayList ();
int idx = startIndex;
bool align = false;
int repeat = 0, n;
for (int i = 0; i < description.Length && idx < buffer.Length; ){
int save = i;
switch (description [i]){
case '^':
conv = BigEndian;
break;
case '_':
conv = LittleEndian;
break;
case '%':
conv = Native;
break;
case 'x':
idx++;
break;
case '!':
align = true;
break;
// Type Conversions
case 'i':
if (Prepare (buffer, ref idx, 4, ref align)){
result.Add (conv.GetInt32 (buffer, idx));
idx += 4;
}
break;
case 'I':
if (Prepare (buffer, ref idx, 4, ref align)){
result.Add (conv.GetUInt32 (buffer, idx));
idx += 4;
}
break;
case 's':
if (Prepare (buffer, ref idx, 2, ref align)){
result.Add (conv.GetInt16 (buffer, idx));
idx += 2;
}
break;
case 'S':
if (Prepare (buffer, ref idx, 2, ref align)){
result.Add (conv.GetUInt16 (buffer, idx));
idx += 2;
}
break;
case 'l':
if (Prepare (buffer, ref idx, 8, ref align)){
result.Add (conv.GetInt64 (buffer, idx));
idx += 8;
}
break;
case 'L':
if (Prepare (buffer, ref idx, 8, ref align)){
result.Add (conv.GetUInt64 (buffer, idx));
idx += 8;
}
break;
case 'f':
if (Prepare (buffer, ref idx, 4, ref align)){
result.Add (conv.GetFloat (buffer, idx));
idx += 4;
}
break;
case 'd':
if (Prepare (buffer, ref idx, 8, ref align)){
result.Add (conv.GetDouble (buffer, idx));
idx += 8;
}
break;
case 'b':
if (Prepare (buffer, ref idx, 1, ref align)){
result.Add (buffer [idx]);
idx++;
}
break;
case 'c': case 'C':
if (Prepare (buffer, ref idx, 1, ref align)){
char c;
if (description [i] == 'c')
c = ((char) ((sbyte)buffer [idx]));
else
c = ((char) ((byte)buffer [idx]));
result.Add (c);
idx++;
}
break;
// Repeat acount;
case '1': case '2': case '3': case '4': case '5':
case '6': case '7': case '8': case '9':
repeat = ((short) description [i]) - ((short) '0');
save = i + 1;
break;
case '*':
repeat = Int32.MaxValue;
break;
case '[':
int count = -1, j;
for (j = i+1; j < description.Length; j++){
if (description [j] == ']')
break;
n = ((short) description [j]) - ((short) '0');
if (n >= 0 && n <= 9){
if (count == -1)
count = n;
else
count = count * 10 + n;
}
}
if (count == -1)
throw new ArgumentException ("invalid size specification");
i = j;
save = i + 1;
repeat = count;
break;
case '$': case 'z':
// bool with_null = description [i] == 'z';
i++;
if (i >= description.Length)
throw new ArgumentException ("$ description needs a type specified", "description");
char d = description [i];
Encoding e;
if (align){
idx = Align (idx, 4);
align = false;
}
if (idx >= buffer.Length)
break;
switch (d){
case '8':
e = Encoding.UTF8;
n = 1;
break;
case '6':
e = Encoding.Unicode;
n = 2;
break;
case '7':
e = Encoding.UTF7;
n = 1;
break;
case 'b':
e = Encoding.BigEndianUnicode;
n = 2;
break;
case '3':
e = Encoding.GetEncoding (12000);
n = 4;
break;
case '4':
e = Encoding.GetEncoding (12001);
n = 4;
break;
default:
throw new ArgumentException ("Invalid format for $ specifier", "description");
}
int k = idx;
switch (n){
case 1:
for (; k < buffer.Length && buffer [k] != 0; k++)
;
result.Add (e.GetChars (buffer, idx, k-idx));
if (k == buffer.Length)
idx = k;
else
idx = k+1;
break;
case 2:
for (; k < buffer.Length; k++){
if (k+1 == buffer.Length){
k++;
break;
}
if (buffer [k] == 0 && buffer [k+1] == 0)
break;
}
result.Add (e.GetChars (buffer, idx, k-idx));
if (k == buffer.Length)
idx = k;
else
idx = k+2;
break;
case 4:
for (; k < buffer.Length; k++){
if (k+3 >= buffer.Length){
k = buffer.Length;
break;
}
if (buffer[k]==0 && buffer[k+1] == 0 && buffer[k+2] == 0 && buffer[k+3]== 0)
break;
}
result.Add (e.GetChars (buffer, idx, k-idx));
if (k == buffer.Length)
idx = k;
else
idx = k+4;
break;
}
break;
default:
throw new ArgumentException (String.Format ("invalid format specified `{0}'",
description [i]));
}
if (repeat > 0){
if (--repeat > 0)
i = save;
} else
i++;
}
return result;
}
internal void Check (byte [] dest, int destIdx, int size)
{
if (dest == null)
throw new ArgumentNullException ("dest");
if (destIdx < 0 || destIdx > dest.Length - size)
throw new ArgumentException ("destIdx");
}
class CopyConverter : DataConverter {
public override double GetDouble (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 8)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
double ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 8; i++)
b [i] = data [index+i];
return ret;
}
public override ulong GetUInt64 (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 8)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
ulong ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 8; i++)
b [i] = data [index+i];
return ret;
}
public override long GetInt64 (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 8)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
long ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 8; i++)
b [i] = data [index+i];
return ret;
}
public override float GetFloat (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 4)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
float ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 4; i++)
b [i] = data [index+i];
return ret;
}
public override int GetInt32 (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 4)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
int ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 4; i++)
b [i] = data [index+i];
return ret;
}
public override uint GetUInt32 (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 4)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
uint ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 4; i++)
b [i] = data [index+i];
return ret;
}
public override short GetInt16 (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 2)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
short ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 2; i++)
b [i] = data [index+i];
return ret;
}
public override ushort GetUInt16 (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 2)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
ushort ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 2; i++)
b [i] = data [index+i];
return ret;
}
public override void PutBytes (byte [] dest, int destIdx, double value)
{
Check (dest, destIdx, 8);
fixed (byte *target = &dest [destIdx]){
long *source = (long *) &value;
*((long *)target) = *source;
}
}
public override void PutBytes (byte [] dest, int destIdx, float value)
{
Check (dest, destIdx, 4);
fixed (byte *target = &dest [destIdx]){
uint *source = (uint *) &value;
*((uint *)target) = *source;
}
}
public override void PutBytes (byte [] dest, int destIdx, int value)
{
Check (dest, destIdx, 4);
fixed (byte *target = &dest [destIdx]){
uint *source = (uint *) &value;
*((uint *)target) = *source;
}
}
public override void PutBytes (byte [] dest, int destIdx, uint value)
{
Check (dest, destIdx, 4);
fixed (byte *target = &dest [destIdx]){
uint *source = (uint *) &value;
*((uint *)target) = *source;
}
}
public override void PutBytes (byte [] dest, int destIdx, long value)
{
Check (dest, destIdx, 8);
fixed (byte *target = &dest [destIdx]){
long *source = (long *) &value;
*((long*)target) = *source;
}
}
public override void PutBytes (byte [] dest, int destIdx, ulong value)
{
Check (dest, destIdx, 8);
fixed (byte *target = &dest [destIdx]){
ulong *source = (ulong *) &value;
*((ulong *) target) = *source;
}
}
public override void PutBytes (byte [] dest, int destIdx, short value)
{
Check (dest, destIdx, 2);
fixed (byte *target = &dest [destIdx]){
ushort *source = (ushort *) &value;
*((ushort *)target) = *source;
}
}
public override void PutBytes (byte [] dest, int destIdx, ushort value)
{
Check (dest, destIdx, 2);
fixed (byte *target = &dest [destIdx]){
ushort *source = (ushort *) &value;
*((ushort *)target) = *source;
}
}
}
class SwapConverter : DataConverter {
public override double GetDouble (byte [] data, int index)
{
if (data == null)
throw new ArgumentNullException ("data");
if (data.Length - index < 8)
throw new ArgumentException ("index");
if (index < 0)
throw new ArgumentException ("index");
double ret;
byte *b = (byte *)&ret;
for (int i = 0; i < 8; i++)
b [7-i] = data [index+i];
return ret;
}
public override ulong GetUInt64 (byte [] data, int index)