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Problem reading resource from own File Format


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#1 SpaceEmotion   Members   -  Reputation: 119

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Posted 19 September 2012 - 05:12 AM

I was following this tutorial over at the old SFML wiki on how to create a resource bundle.
I ported everything to the latest version (SFML 2) and everything works fine, except reading a text resource (pictures are no problem).

EDIT: Pictures seems also to be a problem: "Failed to load image from memory. Reason : Corrupt PNG"

Every time I write the output to the console it gives me sth like "Demo file conten3\339" (The extra characters are the problem).
Somehow it reads more than it needed and adds some parts of the ram to the console which i do not need of course.
The crazy thing is that this problem only occurs if the text length is odd (1,3,5,...). If the length can be divided by two its just fine.

I don't know where the problem is so I hope that someone else can help me - a search with google returned nothing for me Posted Image
Thank you all in advance!

EDIT: because < > are recognized as HTML tags I added a space to the include tags!

ResourceFile.hpp:
#include < iostream >
#include < vector >

using namespace std;


namespace gs {
	/// ResourceFile Header struct
	struct RESFileHeader {
		char uID[4];			/// Unique ID used to know if this file is a DAT File from this class
		char version[1];		/// Version of the RES file format
		char offset[3];			/// Offset to files
		unsigned int nb_files;	/// Number of files in the RES file
	};

	/// ResourceFile File Entry
	struct RESFileEntry {
		char name[128];			/// Name of the file
		long size;				/// Entry size
		long offset;			/// Offset to where the file is in the RES file
	};

	/// ResourceFile main class
	class ResourceFile {
		private :
			string m_filename;				// name of the RES file
			RESFileHeader m_header;			/// file header
			vector<RESFileEntry> m_entries;	/// vector of files entries
			char* m_buffer;					/// Buffer pointing on a file in memory
		
		public :
			ResourceFile();
			~ResourceFile();

			bool createFile (vector<string> files, string destination);
			bool readFile (string source);
			char* getResource (string filename);
			long int getSizeOf (string filename);
	};
}
ResourceFile.cpp:
#include < fstream >

#include "ResourceFile.hpp"


namespace gs {
	ResourceFile::ResourceFile() {
		m_buffer = NULL;
	}

	ResourceFile::~ResourceFile() {
		if(m_buffer != NULL)
			delete m_buffer;
	}

	bool ResourceFile::createFile(vector<string> files, string dest) {
		// File entry in order to push it in the object's vector
		RESFileEntry entry;

		// Input and ouput streams
		ifstream file;
		ofstream resFile;

		// Read/Write buffer
		char ioBuffer[1];

		// Setting the File Header;
		memset(&m_header, 0, sizeof(m_header));			// Fill all with zeros
		memcpy(m_header.uID, "RESF", 5);				// Copy the unique ID
		memcpy(m_header.version, "1", 3);				// Set file protocol version
		m_header.nb_files = (unsigned int)files.size();	// Number of files the file contains


		for (unsigned int i = 0; i < files.size(); i++) {
			cout << files[i] << endl;
			
			file.open (files[i].c_str(), ifstream::in | ifstream::binary);
			
			if (file.is_open()) {
				memset(&entry, 0, sizeof(RESFileEntry) );								// Fill with zeros
				memcpy(entry.name, files[i].c_str(), strlen ( files[i].c_str() ) );		// We keep the file name
				file.seekg (0, ios::end);												// Calculate file size
				entry.size = file.tellg();												// Set size
				entry.offset = 0;
				file.close();															// Close and finish file

				//Finally, we add this File Entry in our vector
				m_entries.push_back(entry);
				
			} else {
				cout << "ERROR Writing File " << files[i] << ". Stopping process!" << endl;
				return false;
			}
		}

		// Once we've got the file offsets, we are setting them correctly
		long realOffset = 0;
		realOffset += sizeof(RESFileHeader);
		realOffset += m_header.nb_files * sizeof(RESFileEntry);
		
		for (unsigned int i = 0; i < m_entries.size(); i++) {
			m_entries[i].offset = realOffset;
			realOffset += m_entries[i].size;
		}

		//And finally, we are writing the DAT file
		resFile.open (dest.c_str(), ofstream::out | ofstream::binary);

		// Write file header
		resFile.write ((char*)&m_header, sizeof(RESFileHeader) );

		// Write file entries table
		for (unsigned int i=0;i<m_entries.size();i++)
			resFile.write ((char*)&m_entries[i], sizeof(RESFileEntry) );

		// Write each file
		for (unsigned int i = 0; i<m_entries.size(); i++) {
			file.open (m_entries[i].name, ifstream::in | ifstream::binary);
			
			if (file.is_open()) {
				file.seekg (0, ios::beg);
				
				while (file.read (ioBuffer, 1))
					resFile.write (ioBuffer, 1);
				
				file.close();
			}
			
			file.clear();
		}

		resFile.close();
		return true;
	}

	bool ResourceFile::readFile(string src) {
		ifstream resFile;	// Resource file to read from
		RESFileEntry entry;	// Raw file entry

		memset(&m_header, 0, sizeof(m_header));	// Fill all with zeros

		// Open and read file
		resFile.open(src.c_str(), ifstream::in | ifstream::binary);

		if (resFile.is_open()) {
			resFile.seekg (0, ios::beg);
			resFile.read ((char*)&m_header, sizeof(RESFileHeader));

			// Read all entries
			for (unsigned int i=0;i<m_header.nb_files;i++) {
				resFile.read ((char*)&entry, sizeof(RESFileEntry));	// Read a File Entry
				m_entries.push_back(entry);							// Push it to vector
			}
			
			m_filename = src;
		} else {
			resFile.close();
			return false;
		}

		resFile.close(); // Close file
		return true;
	}

	char* ResourceFile::getResource(string name) {
		ifstream resFile;

		// Clean buffer
		if (m_buffer != NULL) {
			delete (m_buffer);
			m_buffer = NULL;
		}

		// Find correct file
		for (unsigned int i = 0; i < m_header.nb_files; i++) {
			if (m_entries[i].name == name) {
				m_buffer = new char[(m_entries[i].size)];

				if (m_buffer==NULL) return (NULL);	// Prevent errors through simple catch

				// Open and get file
				resFile.open (m_filename.c_str(), ifstream::in | ifstream::binary);
				if (resFile.is_open()) {
					resFile.seekg (m_entries[i].offset, ios::beg);					
					resFile.read (m_buffer, m_entries[i].size);
					resFile.close();
					
					return m_buffer;
				}
			}
		}

		// No such file - return NULL
		return NULL;
	}

	long int ResourceFile::getSizeOf (string name) {
		// Find correct file
		for (unsigned int i=0; i<m_header.nb_files;i++) {
			if (m_entries[i].name == name)
				return (m_entries[i].size);
		}

		// Return zero
		return 0;
	}
}
main.cpp:
#include < SFML/Graphics.hpp >
#include "engine/ResourceFile.hpp"

using namespace gs;


int main (int argc, const char * argv[]) {
	ResourceFile write_test;
	std::vector<std::string> files;

	files.push_back("logo.png");
	files.push_back("small_bg.png");
	files.push_back("txt_loading.png");
	files.push_back("demo");
	
	if (!write_test.createFile(files, "assets.res"))
		return EXIT_FAILURE;

	ResourceFile read_test;
	char* buffer;
	
	if(!read_test.readFile("assets.res")) {
		std::cout << "Could not open file" << std::endl;
		return EXIT_FAILURE;
	}

	std::cout << read_test.getResource("demo") << std::endl;

	// Test the images

	sf::RenderWindow app(sf::VideoMode(500, 400), "Hibernate");

	sf::Texture tex;

	buffer = read_test.getResource("logo.png");
	if (buffer==NULL) {
		std::cout << "Read error" << std::endl;
		return EXIT_FAILURE;
	}
	
	tex.loadFromMemory(buffer, read_test.getSizeOf("logo.png"));

	sf::Sprite logo = sf::Sprite(tex);
	sf::Event event;
	
	while(app.isOpen()) {
		while (app.pollEvent(event)) {
			if(event.type == sf::Event::Closed) {
				app.close();
				break;
			}
		}

		app.clear();
		app.draw(logo);
		app.display();
	}
	
	return EXIT_SUCCESS;
}

Edited by SpaceEmotion, 19 September 2012 - 07:14 AM.


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