/*
This file is part of jpcsp.

Jpcsp is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Jpcsp is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Jpcsp.  If not, see <http://www.gnu.org/licenses/>.
 */
package jpcsp.HLE.modules;

import org.apache.log4j.Logger;

import jpcsp.HLE.HLEFunction;
import jpcsp.HLE.HLEModule;
import jpcsp.HLE.HLEUnimplemented;
import jpcsp.HLE.Modules;
import jpcsp.HLE.TPointer;
import jpcsp.crypto.SHA256;
import jpcsp.memory.IMemoryReader;
import jpcsp.memory.IMemoryWriter;
import jpcsp.memory.MemoryReader;
import jpcsp.memory.MemoryWriter;
import jpcsp.util.Utilities;

public class sceSha256 extends HLEModule {
    public static Logger log = Modules.getLogger("sceSha256");

    @HLEUnimplemented
    @HLEFunction(nid = 0x5368F1BC, version = 370)
    public int sceSha256BlockInit(TPointer sha) {
    	return 0;
    }

    @HLEUnimplemented
    @HLEFunction(nid = 0x7310DDCF, version = 370)
    public int sceSha256BlockUpdate(TPointer sha, TPointer data, int length) {
    	return 0;
    }

    @HLEUnimplemented
    @HLEFunction(nid = 0x82C67FB3, version = 370)
    public int sceSha256BlockResult(TPointer sha, TPointer digest) {
    	return 0;
    }

    @HLEFunction(nid = 0x318A350C, version = 370)
    public int sceSha256Digest(TPointer data, int length, TPointer digest) {
        if (log.isTraceEnabled()) {
            log.trace(String.format("sceSha256Digest data:%s", Utilities.getMemoryDump(data.getAddress(), length)));
        }

        // Read in the source data.
        byte[] b = new byte[length];
		IMemoryReader memoryReader = MemoryReader.getMemoryReader(data.getAddress(), length, 1);
		for (int i = 0; i < length; i++) {
			b[i] = (byte) memoryReader.readNext();
		}

        // Calculate SHA-256.
        SHA256 sha256 = new SHA256();
        byte[] d = sha256.doSHA256(b, length);
        
        // Write back the resulting digest.
        IMemoryWriter memoryWriter = MemoryWriter.getMemoryWriter(digest.getAddress(), 0x20, 1);
        for (int i = 0; i < 0x20; i++) {
            memoryWriter.writeNext((byte) d[i]);
        }

        return 0;
    }
}