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David Neumaier 2016-12-15 13:53:19 +01:00
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6
App.config Normal file
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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
</startup>
</configuration>

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using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
namespace Pgm {
public enum PgmType { P2, P5 }
public static class PgmCreator {
const byte NEW_LINE = 10; /* ascii code of new line */
const byte HASH = 35; /* ascii code of hash: '#' */
const byte SPACE = 32; /* ascii code of the blank / space */
const byte ASCII_P = 80;
const byte ASCII_2 = 50;
const byte ASCII_5 = 53;
#region PGM Reader
/// <summary>
/// Reads in a PGM file in P2 or P5 Format and returns a byte[,]-Array if everything works fine. Otherwise, exceptions are thrown.
/// For the specification of PGM-Files, see: http://netpbm.sourceforge.net/doc/pgm.html
///
/// This Method was used and modified from http://www.cnblogs.com/lihongsheng0217/archive/2008/08/12/1266426.html
/// Original author: Mennan Tekbir(mtekbir[]gmail[]com).
/// Major modifications by Radomir Dinic and Gerhard Mitterlechner. License: GPL
///
/// IMPORTANT:
/// *) A comment line must be present ofter the type code (P2 or P5).
/// *) Also: class only handles gray-values <= 255 correctly! (according to spec. <= 65536 should be supported)
/// *) Only newlines LF (ASCII 10) are used. Therefore, Windows users who create or modify the P2 PGM (=ASCII) files
/// MANUALLY may run into problems, because Windows OS uses CR (ASCII 13) AND NL (ASCII 10) for a line break.
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
public static byte[,] ReadPgmFile(string filename) {
try {
FileStream inputStream;
BinaryReader pgmReader;
inputStream = File.OpenRead(filename);
pgmReader = new BinaryReader(inputStream);
byte[] pgmDataBuffer; //the actual image-data (width*height many elements)
int width, height; //dimension of the image
using (inputStream) { //using two ressources, using can be nested
using (pgmReader) {
// stores some header info of PGM-File temporarily.
// WARNING: Here, the comment can be max. 999 characters long (plus the '#')!
byte[] tempArray = new byte[1000];
/* Sample PGM : (the dimension of the image is arbitrary, but the max-color value must be 255! (more strict than in specification!))
* P2
* # Created by ...
* 512 512
* 255
* [data]
*/
//read PGM Type P2, P5
tempArray[0] = pgmReader.ReadByte();
if (tempArray[0] != ASCII_P)
throw new FormatException("Wrong first byte in pgm-File.");
tempArray[1] = pgmReader.ReadByte();
if (tempArray[1] != ASCII_2 && tempArray[1] != ASCII_5)
throw new FormatException("Wrong second byte in pgm-File.");
//make a string out of first two read ASCII-Codes:
string sType = System.Text.ASCIIEncoding.Default.GetString(tempArray, 0, 2);
//read until new line
while (pgmReader.ReadByte() != NEW_LINE) {;}
ReadComment(pgmReader, inputStream);
width = Convert.ToInt32(ReadUntil(SPACE, pgmReader));
height = Convert.ToInt32(ReadUntil(NEW_LINE, pgmReader));
if (width < 1 || width > 10000 || height < 1 || height > 10000)
throw new FormatException("Wrong values for width/height.");
//read the maximal gray-scale color value (e.g., 255. Must be < 65536 according to the specification.)
//WARNING: this programm only allows a max color value of 255!!!
int maxColor = Convert.ToInt32(ReadUntil(NEW_LINE, pgmReader));
if (maxColor > 255)
throw new FormatException("Max color value too high: must be <= 255.");
//read image data
pgmDataBuffer = new byte[width * height];
if (sType == "P5")
ReadP5(pgmDataBuffer, pgmReader);
else if (sType == "P2")
ReadP2(pgmDataBuffer, pgmReader);
} //end inner using
} //end outer using
return CreateTwodimensionalArray(pgmDataBuffer, width, height);
} //end outer try
catch (FormatException) {
throw; //just rethrow it
}
catch (FileNotFoundException e) { //example of nested exception (same type)
throw new FileNotFoundException("File " + filename + " could not be found.", e);
}
catch (OutOfMemoryException e) { //example of nested exceptions (different type)
throw new ApplicationException("ReadPGMFile has got too little memory!", e);
}
catch (IOException e) {
throw new Exception("ReadPGMFile produced some IO-exception: " + e.Message);
}
catch (Exception e) {
throw new Exception("ReadPGMFile produced some exception: " + e.Message);
}
}
//Read comments (if existI. Only one or no comment line is supported.
//Only length of max. 999 characters plus the '#'!
private static void ReadComment(BinaryReader pgmReader, FileStream inputStream) {
try {
byte tempByte = pgmReader.ReadByte();
if (tempByte == HASH)
ReadUntil(NEW_LINE, pgmReader);
else //no comment ==> reset cursor
inputStream.Seek(-1, SeekOrigin.Current);
}
catch (IOException e) {
throw new Exception("IO-Exception in ReadComment: " + e.Message);
}
catch (Exception e) {
throw new Exception("Error in ReadComment: " + e.Message);
}
}
//Reads the image data for a P5 file into buffer.
private static void ReadP5(byte[] buffer, BinaryReader pgmReader) {
//If file is binary, read every byte
try {
//store each color value:
byte[] readBytes = pgmReader.ReadBytes(buffer.Length);
//copy the content to the destination buffer:
Array.Copy(readBytes, buffer, readBytes.Length);
}
catch (Exception e) {
throw new Exception("Error reading binary data from P5 file! " + e.Message);
}
}
//Reads the P2 image data to the buffer.
private static void ReadP2(byte[] buffer, BinaryReader pgmReader) {
//if file is text-based every pixel is distinguished by "space"
//and it has up to 3 chars (max grey-value of 255!)
try {
byte[] tempArray = new byte[1000];
byte tempByte = pgmReader.ReadByte();
int k = 0;
while (pgmReader.BaseStream.Position != pgmReader.BaseStream.Length) {
//read all non-newline or non-whitespace character
int i = 0;
while (tempByte != NEW_LINE && tempByte != SPACE) {
tempArray[i] = tempByte;
i++;
tempByte = pgmReader.ReadByte();
}
//Convert the non-newline/non-whitespace characters to a string and
//copy the string representation of every pixel to buffer of image data.
buffer[k] = Convert.ToByte(System.Text.ASCIIEncoding.Default.GetString(tempArray, 0, i));
k++;
tempByte = pgmReader.ReadByte();
if (pgmReader.BaseStream.Position != pgmReader.BaseStream.Length) {
if (tempByte == NEW_LINE || tempByte == SPACE) {
tempByte = pgmReader.ReadByte(); //read next character (must be a non-newline/non-blank)
}
}
} //end while
} //end try
catch (EndOfStreamException e) {
//if premature end of stream is reached...
throw new Exception("Unexcpected end of stream reading P2 file: " + e.Message);
}
catch (IOException e) {
throw new Exception("Some IO exception when reading P2 file: " + e.Message);
}
catch (Exception e){
throw new Exception("Some other exception when reading P2 file: " + e.Message);
}
}
//Reads from pgmReader until separator is reached. (Max 1000 bytes.)
private static string ReadUntil(byte separator, BinaryReader pgmReader) {
try {
byte[] tempArray = new byte[1000];
int i = 0;
byte tempByte = pgmReader.ReadByte();
while (tempByte != separator) {
tempArray[i] = tempByte;
i++;
tempByte = pgmReader.ReadByte();
}
//make a string out of tempArray
return System.Text.ASCIIEncoding.Default.GetString(tempArray, 0, i);
}
catch (IndexOutOfRangeException) {
throw new IndexOutOfRangeException("ReadUntil failed: wrong indices in while-loop.");
}
catch (Exception e) {
throw new Exception("ReadUntil failed: " + e.Message);
}
}
//Creates a two-dim array out of the one-dim pgmDataBuffer.
private static byte[,] CreateTwodimensionalArray(byte[] pgmDataBuffer, int width, int height) {
try {
byte[,] temp = new byte[width, height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
temp[x, y] = pgmDataBuffer[y * width + x];
}
}
return temp;
}
catch (OutOfMemoryException e) {
throw new OutOfMemoryException("CreateTwodimensionalArray failed: too little memory.", e);
}
catch (IndexOutOfRangeException) {
throw new Exception("Wrong index in for-loop of CreateTwodimensionalArray.");
}
catch (Exception e) {
throw new Exception("CreateTwodimensionalArray failed: " + e.Message);
}
}
#endregion
#region PGM Writer
/// <summary>
/// Write a given byte[,] to Pgm-File or throws an exception on an error.
/// Formats:
/// P2: ASCII-Format
/// P5: Binary-Format
/// </summary>
/// <param name="filename">filename or path</param>
/// <param name="imgData">array with image-data</param>
/// <param name="type">Type P2 or P5</param>
public static void WritePgmFile(string filename, byte[,] imgData, PgmType type) {
if (imgData == null)
throw new ArgumentException("WritePgmFileBinary: imgData must not be null.");
switch (type) {
case PgmType.P2:
WritePgmFileASCII(filename, imgData, type);
break;
case PgmType.P5:
WritePgmFileBinary(filename, imgData, type);
break;
default:
throw new ArgumentException("WritePgmFile failed: wrong type!");
}
}
//helper for WritePgmFile
private static void WritePgmFileASCII(string filename, byte[,] imgData, PgmType type) {
StreamWriter writer = null;
try {
writer = new StreamWriter(filename);
writer.Write(BuildPgmHeader(imgData.GetLength(0), imgData.GetLength(1), type));
for (int y = 0; y < imgData.GetLength(1); y++) {
for (int x = 0; x < imgData.GetLength(0); x++) {
string data = imgData[x, y].ToString() + " ";
writer.Write(data);
}
writer.Write('\n');
}
}
catch (UnauthorizedAccessException e) {
throw new Exception("WritePgmFile failed: no permission to write. " + e.Message);
}
catch (Exception e) {
throw new Exception("WritePgmFileASCII failed: could not write to file " + filename + ". " + e.Message);
}
finally { //example using finally (instead of "using")
if (writer != null) writer.Close();
}
}
//helper for WritePgmFile
private static void WritePgmFileBinary(string filename, byte[,] imgData, PgmType type) {
try {
FileStream outputStream = File.Create(filename);
BinaryWriter pgmWriter = new BinaryWriter(outputStream);
using (outputStream) {
using (pgmWriter) {
string PGMInfo = BuildPgmHeader(imgData.GetLength(0), imgData.GetLength(1), type);
byte[] PGMInfoBuffer = System.Text.ASCIIEncoding.Default.GetBytes(PGMInfo);
pgmWriter.Write(PGMInfoBuffer);
byte[] temp = CreateOneDimensionalTempArray(imgData);
pgmWriter.Write(temp);
}
}
}
catch (IOException e) {
throw new Exception("IOException in WritePgmFileBinary writing to file: " + filename + ". " + e.Message);
}
catch (OutOfMemoryException e) {
throw new Exception("WritePgmFile failed with OutOfMemoryException: " + e.Message);
}
catch (UnauthorizedAccessException e) {
throw new Exception("WritePgmFile failed: no permission to write. " + e.Message);
}
}
private static string BuildPgmHeader(int width, int height, PgmType type) {
string header = string.Empty;
switch (type) {
case PgmType.P2:
header += "P2\n";
break;
case PgmType.P5:
header += "P5\n";
break;
default:
throw new ArgumentException("Wrong type in BuildPgmHeader.");
}
header += "# MMT\n";
header += width + " " + height + "\n";
header += "255\n"; //warning: this is hardcoded, should allow a value up to 65535 according to specification!
return header;
}
private static byte[] CreateOneDimensionalTempArray(byte[,] imgData) {
if (imgData == null)
throw new ArgumentException("CreateOneDimensionalTempArray: imgData must not be null.");
int w = imgData.GetLength(0);
int h = imgData.GetLength(1);
try {
byte[] temp = new byte[w * h];
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
temp[y * w + x] = imgData[x, y];
}
}
return temp;
}
catch (OutOfMemoryException e) {
throw new OutOfMemoryException("CreateOneDimensionalTempArray failed. Too little memory! " + e.Message);
}
catch (Exception e) {
throw new Exception("CreateOneDimensionalTempArray failed.", e);
}
}
#endregion
}
}

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using System;
using System.IO;
using System.Diagnostics;
using Pgm;
class PgmCreatorDemo {
//TYPICAL USAGE OF THE PGMCREATOR CLASS:
static void MakeLenaBlackWhite() {
// for the specification of PGM-Files, see: http://netpbm.sourceforge.net/doc/pgm.html
// A byte-array is used for storing the gray-color-values.
// The img has the size 256x256 pixel;
// Each pixel has a gray-color-value from 0-255 (0...black, 255...white).
// Note also that the FIRST dimension (row-index) corresponds
// to the x-Coordinate (!!!) in the image, the second dimension (col-index)
// to the y-coordinate (!!!). The y coordinate goes from up to down!
// Thus, an index of [50, 250] is at the left and bottom of the image.
// (The Write/ReadPGM-Methods internally transpose the matrix.)
// Open Lena, make it black-white (threshold is the value 128), and save it:
try {
byte[,] lenaImgData = PgmCreator.ReadPgmFile("lena.pgm");
for (int x = 0; x < lenaImgData.GetLength(0); x++) {
for (int y = 0; y < lenaImgData.GetLength(1); y++) {
if (lenaImgData[x, y] < 128) lenaImgData[x, y] = 0;
else lenaImgData[x, y] = 255;
}
}
PgmCreator.WritePgmFile("lena_black_white.pgm", lenaImgData, PgmType.P5);
Console.WriteLine("Success making Lena black-white!");
}
catch (FileNotFoundException e) {
Console.WriteLine("Where ist the file? " + e.Message);
}
catch (FormatException e) {
Console.WriteLine("Wrong file format: " + e.Message);
}
catch (Exception e) {
Console.WriteLine(e.Message);
}
}
static void Main(string[] args) {
TestBinaryAndASCIIFormat();
MakeLenaBlackWhite();
}
//Helper Method which produces a byte-array representing a gradient image:
private static byte[,] ProduceGradientImage() {
byte[,] imgData = new byte[256, 256];
// fill the imgData-Array with the gray-color-values:
for (int y = 0; y < imgData.GetLength(1); y++) {
for (int x = 0; x < imgData.GetLength(0); x++) {
// produce a gray-color gradient image:
// top-left corner: black, bottom-right corner: white.
// Note that x and y go from 0 to 255, so x/2 + y/2 cannot exceed the value 254.
imgData[x, y] = (byte)(x / 2 + y / 2);
}
}
return imgData;
}
//Tests whether both pgm file formats work:
private static void TestBinaryAndASCIIFormat() {
byte[,] imgData = ProduceGradientImage();
byte[,] readDataAscii;
byte[,] readDataBinary;
try {
// write imgData to P2 file (ascii):
PgmCreator.WritePgmFile("testASCII.pgm", imgData, PgmType.P2);
// read from P2 file (ascii):
readDataAscii = PgmCreator.ReadPgmFile("testASCII.pgm");
// write image data to P5 file (binary):
PgmCreator.WritePgmFile("testBinary.pgm", readDataAscii, PgmType.P5);
// read P5 file (binary):
readDataBinary = PgmCreator.ReadPgmFile("testBinary.pgm");
//check if the image loaded from the P2-type file (ascii)
//is the same as from the P5-type file (binary):
for (int y = 0; y < imgData.GetLength(1); y++) {
for (int x = 0; x < imgData.GetLength(0); x++) {
Debug.Assert(readDataAscii[x,y] == readDataBinary[x,y]);
}
}
Console.WriteLine("Success in testing two generated files of both types!");
} catch (Exception e) {
Console.WriteLine(e.Message);
}
}
}

14
Program.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace task_78
{
class Program
{
static void Main(string[] args) {
}
}
}

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Properties/AssemblyInfo.cs Normal file
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using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("task_78")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("task_78")]
[assembly: AssemblyCopyright("Copyright © 2016")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("ddc7d81a-b435-4906-9a02-b2560d46f755")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

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font.pgm Normal file
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task_78.csproj Normal file
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<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{DDC7D81A-B435-4906-9A02-B2560D46F755}</ProjectGuid>
<OutputType>Exe</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>task_78</RootNamespace>
<AssemblyName>task_78</AssemblyName>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>

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task_78.sln Normal file
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 14
VisualStudioVersion = 14.0.23107.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "task_78", "task_78.csproj", "{DDC7D81A-B435-4906-9A02-B2560D46F755}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{DDC7D81A-B435-4906-9A02-B2560D46F755}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{DDC7D81A-B435-4906-9A02-B2560D46F755}.Debug|Any CPU.Build.0 = Debug|Any CPU
{DDC7D81A-B435-4906-9A02-B2560D46F755}.Release|Any CPU.ActiveCfg = Release|Any CPU
{DDC7D81A-B435-4906-9A02-B2560D46F755}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
EndGlobal