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POPNM Reader: Can't read some files in binary mode
 

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  1. POPNM Reader: Can't read some files in binary mode
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    <p>I'm having some troubles with pnm files (which is kinda obvious or else I wouldn't be posting here XD). Thing is, my teacher asked us to develop a simple pnm reader in binary mode then print it to the screen. I'm using libEGL (a framework avaliable <a href="https://github.com/farlei/libEGL/tree/master/libEGL" rel="nofollow">here</a>). My problem is that it works only with these two images and fails with any other one.</p> <p>With birch.pnm and checkers.pnm it works, but cathedral.pnm, cotton.pnm and fish_tile.pnm it just simple enters an infinite loop or throws and error.</p> <p>The images are avaliable <a href="http://orion.math.iastate.edu/burkardt/data/pnm/pnm.html" rel="nofollow">here</a></p> <p>My code is as follows:</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include &lt;sstream&gt; #include &lt;fstream&gt; #include "engcomp_glib.h" using namespace std; struct RGB{ char red, green, blue; }; int main(int argc, char* argv[]){ RGB **image; RGB pixel; //ifstream _file("..\\bin\\birch.pnm"); ifstream _file("..\\bin\\checkers.pnm"); //ifstream _file("..\\bin\\cotton.pnm"); //ifstream _file("..\\bin\\cathedral.pnm"); //ifstream _file("..\\bin\\fish_tile.pnm"); string type, maxColor; int width, height; if(_file){ _file &gt;&gt; type; if(type != "P6") cout &lt;&lt; "Error! File type is not allowed." &lt;&lt; endl; _file &gt;&gt; width &gt;&gt; height &gt;&gt; maxColor; _file.close(); egl_inicializar(width, height, true); image = new RGB *[height]; for(int row = 0; row &lt; height; row++) image[row] = new RGB[width]; //Working 8D //_file.open("..\\bin\\birch.pnm", ios::binary); _file.open("..\\bin\\checkers.pnm", ios::binary); //Not working D:&lt; //_file.open("..\\bin\\cathedral.pnm", ios::binary); //_file.open("..\\bin\\fish_tile.pnm", ios::binary); //_file.open("..\\bin\\cotton.pnm", ios::binary); //imagem img; img.carregar("..\\bin\\birch.pnm"); _file.seekg(0, _file.end); int size = _file.tellg(); int currentSize = 0, counter = 0; char byte; _file.seekg(0, _file.beg); do{ _file.read(reinterpret_cast&lt;char *&gt; (&amp;byte), sizeof(char)); if(byte == 10 || byte == 13) counter++; }while(counter &lt; 3); int rows = 0, columns = 0; while(size != currentSize){ _file.read(reinterpret_cast&lt;char *&gt; (&amp;pixel), sizeof(RGB)); if(rows &lt; height &amp;&amp; columns &lt; width){ image[rows][columns] = pixel; rows++; } else if(rows == height){ rows = 0; columns++; image[rows][columns] = pixel; rows++; } //else if(columns &gt;= width) //currentSize = size; currentSize = _file.tellg(); } _file.close(); while(!key[SDLK_ESCAPE]){ for(int row = 0; row &lt; height; row++) for(int column = 0; column &lt; width; column++) //egl_pixel(row, column, image[row][column].red, image[row][column].green, image[row][column].blue); egl_pixel(column, row, image[column][row].red, image[column][row].green, image[column][row].blue); //img.desenha(0, 0); egl_desenha_frame(false); } } egl_finalizar(); return 0; } </code></pre> <p>It doesn't make sense, as it works for two of them, should work form them all I opened them all in a text editor and they have the header, so the problem is not there. What am I doing wrong? My colleague wrote a code that stores the pixels into an array with size [height * width] and can read almost all of the images but cathedral.pnm.</p> <p>Thanks for the patience and help :)</p>
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    1. USR. Martinho Fernandes
    1. USGustavo Coelho
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