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ExifBitConverter.cs
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ExifBitConverter.cs
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using System;
using System.Text;
namespace ExifLibrary
{
/// <summary>
/// Converts between exif data types and array of bytes.
/// </summary>
public class ExifBitConverter : BitConverterEx
{
#region Constructors
/// <summary>
/// Intializes a new instance of the <see cref="ExifBitConverter"/> class.
/// </summary>
/// <param name="from">The byte order to convert from.</param>
/// <param name="to">The byte order to convert to.</param>
public ExifBitConverter(ByteOrder from, ByteOrder to)
: base(from, to)
{
;
}
#endregion
#region Static Methods
/// <summary>
/// Returns an ASCII string converted from the given byte array.
/// </summary>
public static string ToAscii(byte[] data, bool endatfirstnull, Encoding encoding)
{
int len = data.Length;
if (endatfirstnull)
{
len = Array.IndexOf(data, (byte)0);
if (len == -1) len = data.Length;
}
return encoding.GetString(data, 0, len);
}
/// <summary>
/// Returns an ASCII string converted from the given byte array.
/// </summary>
public static string ToAscii(byte[] data, Encoding encoding)
{
return ToAscii(data, true, encoding);
}
/// <summary>
/// Returns a string converted from the given byte array.
/// from the numeric value of each byte.
/// </summary>
public static string ToString(byte[] data)
{
StringBuilder sb = new StringBuilder();
foreach (byte b in data)
sb.Append(b);
return sb.ToString();
}
/// <summary>
/// Returns a DateTime object converted from the given byte array.
/// </summary>
public static DateTime ToDateTime(byte[] data, bool hastime)
{
string str = ToAscii(data, Encoding.ASCII);
string[] parts = str.Split(new char[] { ':', ' ' });
try
{
if (hastime && parts.Length == 6)
{
// yyyy:MM:dd HH:mm:ss
// This is the expected format though some cameras
// can use single digits. See Issue 21.
return new DateTime(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[2]), int.Parse(parts[3]), int.Parse(parts[4]), int.Parse(parts[5]));
}
else if (!hastime && parts.Length == 3)
{
// yyyy:MM:dd
return new DateTime(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[2]));
}
else
{
return DateTime.MinValue;
}
}
catch (ArgumentOutOfRangeException)
{
return DateTime.MinValue;
}
catch (ArgumentException)
{
return DateTime.MinValue;
}
}
/// <summary>
/// Returns a DateTime object converted from the given byte array.
/// </summary>
public static DateTime ToDateTime(byte[] data)
{
return ToDateTime(data, true);
}
/// <summary>
/// Returns an unsigned rational number converted from the first
/// eight bytes of the given byte array. The first four bytes are
/// assumed to be the numerator and the next four bytes are the
/// denumerator.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static MathEx.UFraction32 ToURational(byte[] data, ByteOrder frombyteorder)
{
byte[] num = new byte[4];
byte[] den = new byte[4];
Array.Copy(data, 0, num, 0, 4);
Array.Copy(data, 4, den, 0, 4);
return new MathEx.UFraction32(ToUInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToUInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
}
/// <summary>
/// Returns a signed rational number converted from the first
/// eight bytes of the given byte array. The first four bytes are
/// assumed to be the numerator and the next four bytes are the
/// denumerator.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static MathEx.Fraction32 ToSRational(byte[] data, ByteOrder frombyteorder)
{
byte[] num = new byte[4];
byte[] den = new byte[4];
Array.Copy(data, 0, num, 0, 4);
Array.Copy(data, 4, den, 0, 4);
return new MathEx.Fraction32(ToInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
}
/// <summary>
/// Returns an array of 16-bit unsigned integers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static ushort[] ToUShortArray(byte[] data, int count, ByteOrder frombyteorder)
{
ushort[] numbers = new ushort[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[2];
Array.Copy(data, i * 2, num, 0, 2);
numbers[i] = ToUInt16(num, 0, frombyteorder, BitConverterEx.SystemByteOrder);
}
return numbers;
}
/// <summary>
/// Returns an array of 32-bit unsigned integers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static uint[] ToUIntArray(byte[] data, int count, ByteOrder frombyteorder)
{
uint[] numbers = new uint[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[4];
Array.Copy(data, i * 4, num, 0, 4);
numbers[i] = ToUInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder);
}
return numbers;
}
/// <summary>
/// Returns an array of 32-bit signed integers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static int[] ToSIntArray(byte[] data, int count, ByteOrder byteorder)
{
int[] numbers = new int[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[4];
Array.Copy(data, i * 4, num, 0, 4);
numbers[i] = ToInt32(num, 0, byteorder, BitConverterEx.SystemByteOrder);
}
return numbers;
}
/// <summary>
/// Returns an array of unsigned rational numbers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static MathEx.UFraction32[] ToURationalArray(byte[] data, int count, ByteOrder frombyteorder)
{
MathEx.UFraction32[] numbers = new MathEx.UFraction32[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[4];
byte[] den = new byte[4];
Array.Copy(data, i * 8, num, 0, 4);
Array.Copy(data, i * 8 + 4, den, 0, 4);
numbers[i].Set(ToUInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToUInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
}
return numbers;
}
/// <summary>
/// Returns an array of signed rational numbers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static MathEx.Fraction32[] ToSRationalArray(byte[] data, int count, ByteOrder frombyteorder)
{
MathEx.Fraction32[] numbers = new MathEx.Fraction32[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[4];
byte[] den = new byte[4];
Array.Copy(data, i * 8, num, 0, 4);
Array.Copy(data, i * 8 + 4, den, 0, 4);
numbers[i].Set(ToInt32(num, 0, frombyteorder, BitConverterEx.SystemByteOrder), ToInt32(den, 0, frombyteorder, BitConverterEx.SystemByteOrder));
}
return numbers;
}
/// <summary>
/// Returns an array of 16-bit signed integers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static short[] ToSShortArray(byte[] data, int count, ByteOrder frombyteorder)
{
short[] numbers = new short[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[2];
Array.Copy(data, i * 2, num, 0, 2);
numbers[i] = ToInt16(num, 0, frombyteorder, BitConverterEx.SystemByteOrder);
}
return numbers;
}
/// <summary>
/// Returns an array of 32-bit floating numbers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static float[] ToSingleArray(byte[] data, int count, ByteOrder frombyteorder)
{
float[] numbers = new float[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[4];
Array.Copy(data, i * 4, num, 0, 4);
numbers[i] = ToSingle(num, 0, frombyteorder, BitConverterEx.SystemByteOrder);
}
return numbers;
}
/// <summary>
/// Returns an array of 64-bit floating numbers converted from
/// the given byte array.
/// Numbers are converted from the given byte-order to platform byte-order.
/// </summary>
public static double[] ToDoubleArray(byte[] data, int count, ByteOrder frombyteorder)
{
double[] numbers = new double[count];
for (int i = 0; i < count; i++)
{
byte[] num = new byte[8];
Array.Copy(data, i * 8, num, 0, 8);
numbers[i] = ToDouble(num, 0, frombyteorder, BitConverterEx.SystemByteOrder);
}
return numbers;
}
/// <summary>
/// Converts the given ascii string to an array of bytes optionally adding a null terminator.
/// </summary>
public static byte[] GetBytes(string value, bool addnull, Encoding encoding)
{
if (addnull) value += '\0';
return encoding.GetBytes(value);
}
/// <summary>
/// Converts the given ascii string to an array of bytes without adding a null terminator.
/// </summary>
public static byte[] GetBytes(string value, Encoding encoding)
{
return GetBytes(value, false, encoding);
}
/// <summary>
/// Converts the given datetime to an array of bytes with a null terminator.
/// </summary>
public static byte[] GetBytes(DateTime value, bool hastime)
{
string str = "";
if (hastime)
str = value.ToString("yyyy:MM:dd HH:mm:ss", System.Globalization.CultureInfo.InvariantCulture);
else
str = value.ToString("yyyy:MM:dd", System.Globalization.CultureInfo.InvariantCulture);
return GetBytes(str, true, Encoding.ASCII);
}
/// <summary>
/// Converts the given unsigned rational number to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(MathEx.UFraction32 value, ByteOrder tobyteorder)
{
byte[] num = GetBytes(value.Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
byte[] den = GetBytes(value.Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
byte[] data = new byte[8];
Array.Copy(num, 0, data, 0, 4);
Array.Copy(den, 0, data, 4, 4);
return data;
}
/// <summary>
/// Converts the given signed rational number to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(MathEx.Fraction32 value, ByteOrder tobyteorder)
{
byte[] num = GetBytes(value.Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
byte[] den = GetBytes(value.Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
byte[] data = new byte[8];
Array.Copy(num, 0, data, 0, 4);
Array.Copy(den, 0, data, 4, 4);
return data;
}
/// <summary>
/// Converts the given array of 16-bit unsigned integers to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(ushort[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[2 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 2, 2);
}
return data;
}
/// <summary>
/// Converts the given array of 32-bit unsigned integers to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(uint[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[4 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 4, 4);
}
return data;
}
/// <summary>
/// Converts the given array of 32-bit signed integers to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(int[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[4 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 4, 4);
}
return data;
}
/// <summary>
/// Converts the given array of unsigned rationals to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(MathEx.UFraction32[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[8 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i].Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
byte[] den = GetBytes(value[i].Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 8, 4);
Array.Copy(den, 0, data, i * 8 + 4, 4);
}
return data;
}
/// <summary>
/// Converts the given array of signed rationals to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(MathEx.Fraction32[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[8 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i].Numerator, BitConverterEx.SystemByteOrder, tobyteorder);
byte[] den = GetBytes(value[i].Denominator, BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 8, 4);
Array.Copy(den, 0, data, i * 8 + 4, 4);
}
return data;
}
/// <summary>
/// Converts the given array of 16-bit signed integers to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(short[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[2 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 2, 2);
}
return data;
}
/// <summary>
/// Converts the given array of 32-bit floating numbers to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(float[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[4 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 4, 4);
}
return data;
}
/// <summary>
/// Converts the given array of 64-bit floating numbers to an array of bytes.
/// Numbers are converted from the platform byte-order to the given byte-order.
/// </summary>
public static byte[] GetBytes(double[] value, ByteOrder tobyteorder)
{
byte[] data = new byte[8 * value.Length];
for (int i = 0; i < value.Length; i++)
{
byte[] num = GetBytes(value[i], BitConverterEx.SystemByteOrder, tobyteorder);
Array.Copy(num, 0, data, i * 8, 8);
}
return data;
}
#endregion
}
}