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• C# Regex stops after first line matched

  - by JD Guzman

  Ok so I have a regex and I need it to find matches in a multiline string. This is the string I am using: Device Identifier: disk0 Device Node: /dev/disk0 Part of Whole: disk0 Device / Media Name: OCZ-VERTEX2 Media Volume Name: Not applicable (no file system) Mounted: Not applicable (no file system) File System: None Content (IOContent): GUID_partition_scheme OS Can Be Installed: No Media Type: Generic Protocol: SATA SMART Status: Verified Total Size: 240.1 GB (240057409536 Bytes) (exactly 468862128 512-Byte-Blocks) Volume Free Space: Not applicable (no file system) Device Block Size: 512 Bytes Read-Only Media: No Read-Only Volume: Not applicable (no file system) Ejectable: No Whole: Yes Internal: Yes Solid State: Yes OS 9 Drivers: No Low Level Format: Not supported Basically I need to separate each line into two groups with the colon as the separator. The regex I am using is: @"([A-Za-z0-9\(\) \-\/]+):([A-Za-z0-9\(\) \-\/]+).*" It does work but only picks up the first line and separates it into the two groups like I want but it stops at that point. I have tried the Multiline option but it doesn't make any difference. I must admit I am new to the regex world. Any help is appreciated.

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• Android:Playing bigger size audio wav sound file produces crash

  - by user187532

  Hi Android experts, I am trying to play the bigger size audio wav file(which is 20 mb) using the following code(AudioTrack) on my Android 1.6 HTC device which basically has less memory. But i found device crash as soon as it executes reading, writing and play. But the same code works fine and plays the lesser size audio wav files(10kb, 20 kb files etc) very well. P.S: I should play PCM(.wav) buffer sound, the reason behind why i use AudioTrack here. Though my device has lesser memory, how would i read bigger audio files bytes by bytes and play the sound to avoid crashing due to memory constraints. private void AudioTrackPlayPCM() throws IOException { String filePath = "/sdcard/myWav.wav"; // 8 kb file byte[] byteData = null; File file = null; file = new File(filePath); byteData = new byte[(int) file.length()]; FileInputStream in = null; try { in = new FileInputStream( file ); in.read( byteData ); in.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } int intSize = android.media.AudioTrack.getMinBufferSize(8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_8BIT); AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_8BIT, intSize, AudioTrack.MODE_STREAM); at.play(); at.write(byteData, 0, byteData.length); at.stop(); at.release(); } Could someone guide me please to play the AudioTrack code for bigger size wav files?

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• .NET Sockets Buffer Overflow No Error

  - by Michael Covelli

  I have one thread that is receiving data over a socket like this: while (sock.Connected) { // Receive Data (Block if no data) recvn = sock.Receive(recvb, 0, rlen, SocketFlags.None, out serr); if (recvn <= 0 || sock == null || !sock.Connected) { OnError("Error In Receive, recvn <= 0 || sock == null || !sock.Connected"); return; } else if (serr != SocketError.Success) { OnError("Error In Receive, serr = " + serr); return; } // Copy Data Into Tokenizer tknz.Read(recvb, recvn); // Parse Data while (tknz.MoveToNext()) { try { ParseMessageAndRaiseEvents(tknz.Buffer(), tknz.Length); } catch (System.Exception ex) { string BadMessage = ByteArrayToStringClean(tknz.Buffer(), tknz.Length); string msg = string.Format("Exception in MDWrapper Parsing Message, Ex = {0}, Msg = {1}", ex.Message, BadMessage); OnError(msg); } } } And I kept seeing occasional errors in my parsing function indicating that the message wasn't valid. At first, I thought that my tokenizer class was broken. But after logging all the incoming bytes to the tokenizer, it turns out that the raw bytes in recvb weren't a valid message. I didn't think that corrupted data like this was possible with a tcp data stream. I figured it had to be some type of buffer overflow so I set sock.ReceiveBufferSize = 1024 * 1024 * 8; and the parsing error never, ever occurs in testing (it happens often enough to replicate if I don't change the ReceiveBufferSize). But my question is: why wasn't I seeing an exception or an error state or something if the socket's internal buffer was overflowing before I changed this buffer size?

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• Android Hashtable Serialization

  - by Nsyed

  Hi All, I am having a weird issue with serialization of a Hashtable. I have made a Server, Client app. Where server(PC/MAC) is serializing a Hashtable and sending it to Client(Android) through UDP. The data is sent/read correctly but I get a bunch of these messages below on LogCat. 04-12 11:19:43.059: DEBUG/dalvikvm(407): GetFieldID: unable to find field Ljava/util/Hashtable;.loadFactor:F Occasionally, I would see these 04-12 11:21:19.150: DEBUG/dalvikvm(407): GC freed 10814 objects / 447184 bytes in 97ms The app would run for 2-3 mins and then crash. Interestingly enough I do not see the Loadfactor errors on SDK 1.5. But I do see the GC Free xxxx objects, quiet often. After debugging I have found that the issue is with de-serialization and the error/warning are coming from following code Code: ByteArrayInputStream bis = new ByteArrayInputStream(bytes); ObjectInputStream ois = new ObjectInputStream(bis); object = ois.readObject(); at Code: object = ois.readObject(); on the client. My server is serializing code is the following. Code: ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(obj); Any idea what is going on? Thanks for the Help!

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• Why can't HTC Droid running OTA 2.1 communicate with RFCOMM?

  - by Brad Hein

  Yesterday we received OTA Android 2.1 on my wife's HTC Droid - HOORAY!!! I am finally able to load my carputer app on her phone. Well we loaded it, but it doesn't work. Specifically, it connects but sees no I/O!!! I paired, re-paired, and re-paired again, every time its the same problem: connect() says we connected successfully, but any attempt to send or receive data appears to work but no data ever arrives in the input buffer. The device I'm connecting to uses AT commands. ATI should respond with a device ID. That works fine when I run the app on my Moto Droid, but on the HTC droid, no data is ever present in the inputstream/buffer. Personally, I'm feeling pretty sure it's a bug or limitation in this release for the HTC (because the app works great on my Moto A855 Droid). Can anybody comment on the issue? Obligatory code snippets: Member variable defining my RFCOMM UUID static final UUID UUID_RFCOMM_GENERIC = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"); Parts of my connect() // make sure peer is defined as a valid device based on their MAC. If not then do it. if (mBTDevice == null) mBTDevice = mBTAdapter.getRemoteDevice(mPeerMAC); // Make an RFCOMM binding. try {mBTSocket = mBTDevice.createRfcommSocketToServiceRecord(UUID_RFCOMM_GENERIC); } catch (Exception e1) { msg ("connect(): Failed to bind to RFCOMM by UUID. msg=" + e1.getMessage()); return false; } msg ("connect(): Try to connect."); try { mBTSocket.connect(); } catch (Exception e) { msg ("connect(): Exception thrown during connect: " + e.getMessage()); return false; // there was a problem connecting... make a note of the particulars and move on. } msg ("connect(): CONNECTED!"); try { mBTOutputStream = mBTSocket.getOutputStream(); mBTInputStream = new BufferedInputStream (mBTSocket.getInputStream(),INPUT_BUFFER_SIZE); //msg ("Connecting non-buffered input stream..."); //mBTInputStream = mBTSocket.getInputStream(); } catch (Exception e) { msg ("connect(): Error attaching i/o streams to socket. msg=" + e.getMessage()); return false; } resetErrorCounters(); setConnected(true); return true; } Then I send "ATI\r" and expect something like "CAN OBD II" but I get nothing. mBTInputStream.available(), it seems, is ALWAYS zero, even when data should be in the input buffer. There are GOBS of trace messages being generated by the OS as viewed with adb logcat -v time Some of the more interesting ones: 05-17 19:44:21.447 D/BluetoothSppPort( 5809): connected to device service! 05-17 19:44:21.447 D/BluetoothSppPort( 5809): Creating a BluetoothSpp proxy object 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort called! 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort checking uuid 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort UUID=00001101-0000-1000-8000-00805f9b34fb auth=true encrypt=true 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort enforcing bluetooth perm 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort creating a jbtlspp object 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort checking if the btl spp object is valid 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort try to create an spp container 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort try to create security params 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort Set Security L2 05-17 19:44:21.467 D/BluetoothSppService( 74): createPort spp port create 05-17 19:44:21.467 D/JBtlSpp ( 74): create: Entered 05-17 19:44:21.467 D/JBtlSpp ( 74): Calling NativeJBtlSpp_Create 05-17 19:44:21.467 D/JBtlSppNative( 74): NativeJBtlSpp_Create: Entered 05-17 19:44:21.467 D/JBtlSppNative( 74): NativeJBtlSpp_Create: Calling BTL_SPP_Remote_Create 05-17 19:44:21.477 D/JBtlSppNative( 74): NativeJBtlSpp_Create: BTL_SPP_Remote_Create returned 0, context:18 05-17 19:44:21.477 D/JBtlSppNative( 74): NativeJBtlSpp_Create: Setting context value in jContext out parm 05-17 19:44:21.477 D/JBtlSppNative( 74): NativeJBtlSpp_Create: Calling Java setValue(0x18) in context's class 05-17 19:44:21.477 D/JBtlProfileContext( 74): setValue: setValue called, value:24 05-17 19:44:21.477 D/JBtlSppNative( 74): create_spp_port_data: will use context struct 0 for the port 24 05-17 19:44:21.477 D/JBtlSppNative( 74): create_spp_port_data: spp port context 0 added 05-17 19:44:21.477 D/JBtlSppNative( 74): NativeJBtlSpp_Create:Exiting Successfully 05-17 19:44:21.477 D/JBtlSpp ( 74): After NativeJBtlSpp_Create, status=SUCCESS, Context = 24 05-17 19:44:21.477 D/JBtlRbtlServices( 74): addUser: Entered, userRefCount = 1 05-17 19:44:21.477 D/BluetoothSppService( 74): port create returned status SUCCESS 05-17 19:44:21.477 D/JBtlSpp ( 74): enable: Entered 05-17 19:44:21.477 D/JBtlSpp ( 74): enable: UUID=00001101-0000-1000-8000-00805f9b34fb 05-17 19:44:21.477 D/JBtlSppNative( 74): NativeJBtlSpp_Enable: Entered 05-17 19:44:21.487 D/JBtlSppNative( 74): NativeJBtlSpp_Enable: BTL_SPP_Enable returned 0 05-17 19:44:21.487 D/JBtlSppNative( 74): NativeJBtlSpp_Enable:Exiting 05-17 19:44:21.487 D/JBtlSpp ( 74): After NativeJBtlSpp_Enable, status=SUCCESS 05-17 19:44:21.487 D/JBtlSpp ( 74): enable: Exiting 05-17 19:44:21.487 D/BluetoothSppService( 74): port enable returned status SUCCESS 05-17 19:44:21.487 D/BluetoothSppService( 74): connectPort called! 05-17 19:44:21.497 D/BluetoothSppService( 74): connectPort received bdaddress:00:18:E4:1D:23:9B 05-17 19:44:21.527 D/BluetoothSppService( 74): Trying to connect to 00:18:E4:1D:23:9B 05-17 19:44:21.527 D/JBtlSpp ( 74): setServiceName: Entered 05-17 19:44:21.527 D/JBtlSppNative( 74): NativeJBtlSpp_SetServiceName: Entered 05-17 19:44:21.547 D/JBtlSppNative( 74): NativeJBtlSpp_SetServiceName: native func returned 0 05-17 19:44:21.547 D/JBtlSppNative( 74): NativeJBtlSpp_SetServiceName:Exiting 05-17 19:44:21.547 D/JBtlSpp ( 74): After setServiceName, status=SUCCESS 05-17 19:44:21.547 D/JBtlSpp ( 74): setServiceName: Exiting 05-17 19:44:21.557 D/BluetoothSppService( 74): port setServiceName returned status SUCCESS 05-17 19:44:21.587 D/JBtlSpp ( 74): connect: Entered connecting to 00:18:E4:1D:23:9B 05-17 19:44:21.587 D/JBtlSppNative( 74): NativeJBtlSpp_Connect: Entered 05-17 19:44:21.597 D/JBtlSppNative( 74): NativeJBtlSpp_Connect: BTL_SPP_Connect returned 2 05-17 19:44:21.597 D/JBtlSppNative( 74): NativeJBtlSpp_Connect:Exiting 05-17 19:44:21.597 D/JBtlSpp ( 74): After NativeJBtlSpp_Connect, status=PENDING 05-17 19:44:21.747 D/AK8973 ( 61): Compass CLOSE 05-17 19:44:21.887 W/Process ( 74): Unable to open /proc/5749/status 05-17 19:44:21.917 I/ActivityManager( 74): Displayed activity com.gtosoft.dash/.Dash: 1279 ms (total 1279 ms) 05-17 19:44:24.047 D/ ( 74): signal_BTEVENT_ACCESSIBLE_CHANGE: Entered 05-17 19:44:24.047 D/ ( 74): signal_BTEVENT_ACCESSIBLE_CHANGE: Calling Java Accessible Change callback 05-17 19:44:24.047 D/JBtlBmg ( 74): nativeAccessibleChange 05-17 19:44:24.087 D/BluetoothService( 74): Callback - accessbileChange, btErrCode = NO_ERROR, mode = CONNECTABLE_ONLY 05-17 19:44:24.087 D/BluetoothService( 74): Sending ACTION_SCAN_MODE_CHANGED intent, mode = 21 05-17 19:44:24.087 D/ ( 74): signal_BTEVENT_ACCESSIBLE_CHANGE: Exiting 05-17 19:44:24.097 D/ ( 74): signal_BTEVENT_LINK_CONNECT_CNF: Entered 05-17 19:44:24.097 D/ ( 74): signal_BTEVENT_LINK_CONNECT_CNF: context: 1, errCode: 0 05-17 19:44:24.097 D/ ( 74): signal_BTEVENT_LINK_CONNECT_CNF: Calling Java Link Connect Confirmation callback 05-17 19:44:24.097 D/JBtlBmg ( 74): nativeLinkConnectCnf 05-17 19:44:24.107 D/BluetoothService( 74): Callback - linkConnectCnf, btErrCode = NO_ERROR, bdAddr = 00:18:E4:1D:23:9B 05-17 19:44:24.117 D/JBtlBmg ( 74): getKnownDeviceInfo: Entered 05-17 19:44:24.117 D/JBtlBmg ( 74): getKnownDeviceInfo: Calling NativeJBtlBmg_GetKnownDeviceInfo 05-17 19:44:24.137 D/ ( 74): NativeJBtlBmg_GetKnownDeviceInfo: Entered 05-17 19:44:24.137 D/ ( 74): NativeJBtlBmg_GetKnownDeviceInfo: Calling BTL_BMG_GetKnownDeviceInfo 05-17 19:44:24.227 D/JBtlBmgJniKnownDeviceInfo( 74): setValues: Entered 05-17 19:44:24.227 D/ ( 74): NativeJBtlBmg_GetKnownDeviceInfo:Exiting 05-17 19:44:24.227 D/JBtlBmg ( 74): getKnownDeviceInfo: After NativeJBtlBmg_GetKnownDeviceInfo, status=SUCCESS 05-17 19:44:24.227 D/JBtlBmg ( 74): getKnownDeviceInfo: Exiting 05-17 19:44:24.227 D/BluetoothService( 74): onRemoteDeviceConnected, device 00:18:E4:1D:23:9B is Paired 05-17 19:44:24.227 D/BluetoothService( 74): Sending ACTION_ACL_CONNECTED intent, address = 00:18:E4:1D:23:9B 05-17 19:44:24.227 D/BluetoothA2dpService( 74): Received intent with action: android.bluetooth.device.action.ACL_CONNECTED 05-17 19:44:24.227 D/ ( 74): signal_BTEVENT_LINK_CONNECT_CNF: Exiting 05-17 19:44:24.757 D/JBtlAg ( 163): setIndicatorValue: entered 05-17 19:44:24.767 I/JBtlAg ( 163): After NativeJBtlAg_SetIndicatorValue, status = SUCCESS 05-17 19:44:24.767 D/JBtlAg ( 163): setIndicatorValue: exiting 05-17 19:44:24.807 D/JBtlSppNative( 74): signal_SPP_EVENT_OPEN: Entered 05-17 19:44:24.807 D/JBtlSppNative( 74): signal_SPP_EVENT_OPEN: status: 0 context:24 05-17 19:44:24.827 D/JBtlSpp ( 74): nativeCb_open: Entered from 00:18:E4:1D:23:9B 05-17 19:44:24.827 D/JBtlSpp ( 74): nativeCb_open: Calling callback 05-17 19:44:24.827 D/BluetoothSppService( 74): connected called! 05-17 19:44:24.847 D/JBtlSpp ( 74): connect: Exiting 05-17 19:44:24.847 D/BluetoothSppService( 74): port connect returned status SUCCESS 05-17 19:44:24.847 D/JBtlSppNative( 74): signal_SPP_EVENT_OPEN: Exiting 05-17 19:44:24.847 D/JBtlSppNative( 74): signal_SPP_EVENT_MODEM_STATUS_IND: Entered 05-17 19:44:24.847 D/JBtlSppNative( 74): signal_SPP_EVENT_MODEM_STATUS_IND: Exiting 05-17 19:44:25.424 D/BluetoothSppService( 74): writeSync called! 05-17 19:44:25.424 D/JBtlSpp ( 74): write: Entered 05-17 19:44:25.427 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: Entered 05-17 19:44:25.427 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: BTL_SPP_WriteSync returned 0 written: 6 total: 0/6 05-17 19:44:25.437 D/JBtlSppNative( 74): signal_SPP_EVENT_TX_DATA_COMPLETE: Entered 05-17 19:44:25.437 D/JBtlSppNative( 74): signal_SPP_EVENT_TX_DATA_COMPLETE: status: 0 context:24 txDataLen:6 05-17 19:44:25.437 D/JBtlSppNative( 74): signal_SPP_EVENT_TX_DATA_COMPLETE: Exiting ok 05-17 19:44:25.437 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: written 6 05-17 19:44:25.437 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative:Exiting with 0 05-17 19:44:25.437 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: returning 6 bytes 05-17 19:44:25.437 D/JBtlSpp ( 74): After write, status=SUCCESS 05-17 19:44:25.437 D/JBtlSpp ( 74): write: Exiting 05-17 19:44:25.437 D/BluetoothSppPort( 5809): written 6 bytes 05-17 19:44:25.467 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Entered 05-17 19:44:25.467 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: status: 0 context: 24 rxDataLen: 1 05-17 19:44:25.467 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Exiting 05-17 19:44:25.477 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Entered 05-17 19:44:25.477 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: status: 0 context: 24 rxDataLen: 5 05-17 19:44:25.477 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Exiting 05-17 19:44:25.487 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Entered 05-17 19:44:25.487 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: status: 0 context: 24 rxDataLen: 10 05-17 19:44:25.487 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Exiting 05-17 19:44:25.497 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Entered 05-17 19:44:25.497 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: status: 0 context: 24 rxDataLen: 7 05-17 19:44:25.497 D/JBtlSppNative( 74): signal_SPP_EVENT_RX_DATA_IND: Exiting 05-17 19:44:27.930 W/ActivityManager( 74): Activity destroy timeout for HistoryRecord{447e0d48 com.gtosoft.dash/.Dash} 05-17 19:44:29.907 D/dalvikvm( 448): GC freed 78 objects / 3664 bytes in 153ms 05-17 19:44:29.917 D/BluetoothSppService( 74): writeSync called! 05-17 19:44:29.917 D/JBtlSpp ( 74): write: Entered 05-17 19:44:29.917 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: Entered 05-17 19:44:29.927 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: BTL_SPP_WriteSync returned 0 written: 6 total: 0/6 05-17 19:44:29.937 D/JBtlSppNative( 74): signal_SPP_EVENT_TX_DATA_COMPLETE: Entered 05-17 19:44:29.937 D/JBtlSppNative( 74): signal_SPP_EVENT_TX_DATA_COMPLETE: status: 0 context:24 txDataLen:6 05-17 19:44:29.937 D/JBtlSppNative( 74): signal_SPP_EVENT_TX_DATA_COMPLETE: Exiting ok 05-17 19:44:29.937 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: written 6 05-17 19:44:29.937 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative:Exiting with 0 05-17 19:44:29.937 D/JBtlSppNative( 74): NativeJBtlSpp_WriteNative: returning 6 bytes 05-17 19:44:29.937 D/JBtlSpp ( 74): After write, status=SUCCESS 05-17 19:44:29.937 D/JBtlSpp ( 74): write: Exiting

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• Java HTTP Requests Buffer size

  - by behrk2

  Hello, I have an HTTP Request Dispatcher class that works most of the time, but I had noticed that it "stalls" when receiving larger requests. After looking into the problem, I thought that perhaps I wasn't allocating enough bytes to the buffer. Before, I was doing: byte[] buffer = new byte[10000]; After changing it to 20000, it seems to have stopped stalling: String contentType = connection.getHeaderField("Content-type"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); InputStream responseData = connection.openInputStream(); byte[] buffer = new byte[20000]; int bytesRead = responseData.read(buffer); while (bytesRead > 0) { baos.write(buffer, 0, bytesRead); bytesRead = responseData.read(buffer); } baos.close(); connection.close(); Am I doing this right? Is there anyway that I can dynamically set the number of bytes for the buffer based on the size of the request? Thanks...

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• A error about "Address 0x0 is not stack'd, malloc'd or (recently) free'd" in c program under linux

  - by MaiTiano

  There is a piece of my program: height = atoi(argv[3]); width = atoi(argv[2]); sprintf(seqName,"%s", argv[1]); // strcpy(seqName, argv[1]); After compiling it, a exe file test is generated, then I use Valgrind to check it. Then I got the following message, however I cannot understand what it tends to tell me. Can anyone provide some kind help, Thanks. 1 contexts (suppressed: 13 from 8) 1 contexts (suppressed: 13 from 8) jl@ubuntu:~/work/dsr_analysis$ valgrind --tool=memcheck --leak-check=yes ./test ==28940== Memcheck, a memory error detector ==28940== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al. ==28940== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info ==28940== Command: ./test ==28940== ==28940== Invalid read of size 1 ==28940== at 0x40260CA: strcpy (mc_replace_strmem.c:311) ==28940== by 0x804A5C6: main (me_search.c:1428) ==28940== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==28940== ==28940== ==28940== Process terminating with default action of signal 11 (SIGSEGV) ==28940== Access not within mapped region at address 0x0 ==28940== at 0x40260CA: strcpy (mc_replace_strmem.c:311) ==28940== by 0x804A5C6: main (me_search.c:1428) ==28940== If you believe this happened as a result of a stack ==28940== overflow in your program's main thread (unlikely but ==28940== possible), you can try to increase the size of the ==28940== main thread stack using the --main-stacksize= flag. ==28940== The main thread stack size used in this run was 8388608. ==28940== ==28940== HEAP SUMMARY: ==28940== in use at exit: 0 bytes in 0 blocks ==28940== total heap usage: 0 allocs, 0 frees, 0 bytes allocated ==28940== ==28940== All heap blocks were freed -- no leaks are possible ==28940== ==28940== For counts of detected and suppressed errors, rerun with: -v ==28940== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 13 from 8)1 contexts (suppressed: 13 from 8) 1 contexts (suppressed: 13 from 8)

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• Python3 and ftplib uploading files

  - by Teifion

  My python2 script uploads files nicely using this method but python3 is presenting problems and I'm stuck as to where to go next (googling hasn't helped). from ftplib import FTP ftp = FTP(ftp_host, ftp_user, ftp_pass) ftp.storbinary('STOR myfile.txt', open('myfile.txt')) The error I get is Traceback (most recent call last): File "/Library/WebServer/CGI-Executables/rob3/functions/cli_f.py", line 12, in upload ftp.storlines('STOR myfile.txt', open('myfile.txt')) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 454, in storbinary conn.sendall(buf) TypeError: must be bytes or buffer, not str I tried altering the code to from ftplib import FTP ftp = FTP(ftp_host, ftp_user, ftp_pass) ftp.storbinary('STOR myfile.txt'.encode('utf-8'), open('myfile.txt')) But instead I got this Traceback (most recent call last): File "/Library/WebServer/CGI-Executables/rob3/functions/cli_f.py", line 12, in upload ftp.storbinary('STOR myfile.txt'.encode('utf-8'), open('myfile.txt')) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 450, in storbinary conn = self.transfercmd(cmd) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 358, in transfercmd return self.ntransfercmd(cmd, rest)[0] File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 329, in ntransfercmd resp = self.sendcmd(cmd) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 244, in sendcmd self.putcmd(cmd) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 179, in putcmd self.putline(line) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/ftplib.py", line 172, in putline line = line + CRLF TypeError: can't concat bytes to str Can anybody point me in the right direction

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• memory alignment within gcc structs

  - by Mumbles

  I am porting an application to an ARM platform in C, the application also runs on an x86 processor, and must be backward compatible. I am now having some issues with variable alignment. I have read the gcc manual for __attribute__((aligned(4),packed)) I interpret what is being said as the start of the struct is aligned to the 4 byte boundry and the inside remains untouched because of the packed statement. originally I had this but occasionally it gets placed unaligned with the 4 byte boundary. typedef struct { unsigned int code; unsigned int length; unsigned int seq; unsigned int request; unsigned char nonce[16]; unsigned short crc; } __attribute__((packed)) CHALLENGE; so I change it to this. typedef struct { unsigned int code; unsigned int length; unsigned int seq; unsigned int request; unsigned char nonce[16]; unsigned short crc; } __attribute__((aligned(4),packed)) CHALLENGE; The understand I stated earlier seems to be incorrect as both the struct is now aligned to a 4 byte boundary, and and the inside data is now aligned to a four byte boundary, but because of the endianess, the size of the struct has increased in size from 42 to 44 bytes. This size is critical as we have other applications that depend on the struct being 42 bytes. Could some describe to me how to perform the operation that I require. Any help is much appreciated.

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• Optimize CUDA with Thrust in a loop

  - by macs

  Given the following piece of code, generating a kind of code dictionary with CUDA using thrust (C++ template library for CUDA): thrust::device_vector<float> dCodes(codes->begin(), codes->end()); thrust::device_vector<int> dCounts(counts->begin(), counts->end()); thrust::device_vector<int> newCounts(counts->size()); for (int i = 0; i < dCodes.size(); i++) { float code = dCodes[i]; int count = thrust::count(dCodes.begin(), dCodes.end(), code); newCounts[i] = dCounts[i] + count; //Had we already a count in one of the last runs? if (dCounts[i] > 0) { newCounts[i]--; } //Remove thrust::detail::normal_iterator<thrust::device_ptr<float> > newEnd = thrust::remove(dCodes.begin()+i+1, dCodes.end(), code); int dist = thrust::distance(dCodes.begin(), newEnd); dCodes.resize(dist); newCounts.resize(dist); } codes->resize(dCodes.size()); counts->resize(newCounts.size()); thrust::copy(dCodes.begin(), dCodes.end(), codes->begin()); thrust::copy(newCounts.begin(), newCounts.end(), counts->begin()); The problem is, that i've noticed multiple copies of 4 bytes, by using CUDA visual profiler. IMO this is generated by The loop counter i float code, int count and dist Every access to i and the variables noted above This seems to slow down everything (sequential copying of 4 bytes is no fun...). So, how i'm telling thrust, that these variables shall be handled on the device? Or are they already? Using thrust::device_ptr seems not sufficient for me, because i'm not sure whether the for loop around runs on host or on device (which could also be another reason for the slowliness).

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• Why do System.IO.Log SequenceNumbers have variable length?

  - by Doug McClean

  I'm trying to use the System.IO.Log features to build a recoverable transaction system. I understand it to be implemented on top of the Common Log File System. The usual ARIES approach to write-ahead logging involves persisting log record sequence numbers in places other than the log (for example, in the header of the database page modified by the logged action). Interestingly, the documentation for CLFS says that such sequence numbers are always 64-bit integers. Confusingly, however, the .Net wrapper around those SequenceNumbers can be constructed from a byte[] but not from a UInt64. It's value can also be read as a byte[], but not as a UInt64. Inspecting the implementation of SequenceNumber.GetBytes() reveals that it can in fact return arrays of either 8 or 16 bytes. This raises a few questions: Why do the .Net sequence numbers differ in size from the CLFS sequence numbers? Why are the .Net sequence numbers variable in length? Why would you need 128 bits to represent such a sequence number? It seems like you would truncate the log well before using up a 64-bit address space (16 exbibytes, or around 10^19 bytes, more if you address longer words)? If log sequence numbers are going to be represented as 128 bit integers, why not provide a way to serialize/deserialize them as pairs of UInt64s instead of rather-pointlessly incurring heap allocations for short-lived new byte[]s every time you need to write/read one? Alternatively, why bother making SequenceNumber a value type at all? It seems an odd tradeoff to double the storage overhead of log sequence numbers just so you can have an untruncated log longer than a million terabytes, so I feel like I'm missing something here, or maybe several things. I'd much appreciate it if someone in the know could set me straight.

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• How is a relative JMP (x86) implemented in an Assembler?

  - by Pindatjuh

  While building my assembler for the x86 platform I encountered some problems with encoding the JMP instruction: enc inst size in bytes EB cb JMP rel8 2 E9 cw JMP rel16 4 (because of 0x66 16-bit prefix) E9 cd JMP rel32 5 ... (from my favourite x86 instruction website, http://siyobik.info/index.php?module=x86&id=147) All are relative jumps, where the size of each encoding (operation + operand) is in the third column. Now my original (and thus fault because of this) design reserved the maximum (5 bytes) space for each instruction. The operand is not yet known, because it's a jump to a yet unknown location. So I've implemented a "rewrite" mechanism, that rewrites the operands in the correct location in memory, if the location of the jump is known, and fills the rest with NOPs. This is a somewhat serious concern in tight-loops. Now my problem is with the following situation: b: XXX c: JMP a e: XXX ... XXX d: JMP b a: XXX (where XXX is any instruction, depending on the to-be assembled program) The problem is that I want the smallest possible encoding for a JMP instruction (and no NOP filling). I have to know the size of the instruction at c before I can calculate the relative distance between a and b for the operand at d. The same applies for the JMP at c: it needs to know the size of d before it can calculate the relative distance between e and a. How do existing assemblers implement this, or how would you implement this? This is what I am thinking which solves the problem: First encode all the instructions to opcodes between the JMP and it's target, and if this region contains a variable-sized opcode, use the maximum size, i.e. 5 for JMP. Then in some conditions, the JMP is oversized (because it may fit in a smaller encoding): so another pass will search for oversized JMPs, shrink them, and move all instructions ahead), and set absolute branching instructions (i.e. external CALLs) after this pass is completed. I wonder, perhaps this is an over-engineered solution, that's why I ask this question.

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• use exec for dsadd

  - by Daryl Gill

  I'm Programming on a Windows Server 2008 and I wish to have a WebUI to interact with the domains active directory. One of my main problems is this that i'm using dsadd from a HTML form but this is no succeeding. I know my command is correct, I have tested it out on the Servers Command line My Code is As Below: if (isset($_POST['Submit'])) { $DesiredUsername = $_POST['DesiredUsername']; $DesiredPassword = $_POST['DesiredPassword']; $DU = "{$DesiredUsername}"; // Desired Username $OU = "PHPCreatedUsers"; // Domain OU $DC1 = "slayerserv"; // Domain Part one $DC2 = "local"; // Domain Part Two $PWD = "{$DesiredPassword}"; // Password $ExecScript = 'dsadd user cn=$DesiredUsername,cn=PHPCreatedUsers,dc=slayerserv,dc=local -disabled no -pwd $DesiredPassword -mustchpwd yes'; exec($ExecScript, $output); mysql_query("INSERT INTO addedusers (`ID`, `DU`, `OU`, `DC1`, `DC2, `PWD`) VALUES ('', '$DU', '$OU', '$DC1', '$DC2', '$PWD')"); echo "<br><br>"; print_r($output); # echo "User: $DesiredUsername Has been Created"; } When I print_r($output); it Returns a blank array: Array ( ) Could anyone provide me with a solution or point me in the right direction? ++++ Below is a working example of my usage of exec $Script = 'ping 127.0.0.1 -n 1'; exec($Script, $Output); print_r($Output); print_r($Output); Gives: Array ( [0] = [1] = Pinging 127.0.0.1 with 32 bytes of data: [2] = Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 [3] = [4] = Ping statistics for 127.0.0.1: [5] = Packets: Sent = 1, Received = 1, Lost = 0 (0% loss), [6] = Approximate round trip times in milli-seconds: [7] = Minimum = 0ms, Maximum = 0ms, Average = 0ms )

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• Help needed in grokking password hashes and salts

  - by javafueled

  I've read a number of SO questions on this topic, but grokking the applied practice of storing a salted hash of a password eludes me. Let's start with some ground rules: a password, "foobar12" (we are not discussing the strength of the password). a language, Java 1.6 for this discussion a database, postgreSQL, MySQL, SQL Server, Oracle Several options are available to storing the password, but I want to think about one (1): Store the password hashed with random salt in the DB, one column Found on SO and elsewhere is the automatic fail of plaintext, MD5/SHA1, and dual-columns. The latter have pros and cons MD5/SHA1 is simple. MessageDigest in Java provides MD5, SHA1 (through SHA512 in modern implementations, certainly 1.6). Additionally, most RDBMSs listed provide methods for MD5 encryption functions on inserts, updates, etc. The problems become evident once one groks "rainbow tables" and MD5 collisions (and I've grokked these concepts). Dual-column solutions rest on the idea that the salt does not need to be secret (grok it). However, a second column introduces a complexity that might not be a luxury if you have a legacy system with one (1) column for the password and the cost of updating the table and the code could be too high. But it is storing the password hashed with a random salt in single DB column that I need to understand better, with practical application. I like this solution for a couple of reasons: a salt is expected and considers legacy boundaries. Here's where I get lost: if the salt is random and hashed with the password, how can the system ever match the password? I have theory on this, and as I type I might be grokking the concept: Given a random salt of 128 bytes and a password of 8 bytes ('foobar12'), it could be programmatically possible to remove the part of the hash that was the salt, by hashing a random 128 byte salt and getting the substring of the original hash that is the hashed password. Then re hashing to match using the hash algorithm...??? So... any takers on helping. :) Am I close?

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• Problem in migrating to LAMP from XAMPP.. Memory limit error

  - by Geshan

  I was using XAMPP for my local machine but as I wanted to run applications like mysql work bench and some test frameworks I decided to switch to LAMP self install. I'm using ubuntu and followed the instructions at: https://help.ubuntu.com/community/ApacheMySQLPHP But the problem is LAMP is consuming too much of my memory (RAM) I've allocated 124 MB currently but still it gives me memory exhausted error when I run Drush (Drupal command line). When I do drush cc to clear cache it give me the following: Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 122880 bytes) in /var/www/----/sites/all/modules/ubercart/uc_order/uc_order.order_pane.inc on line 150 Call Stack: 0.0020 185624 1. {main}() /opt/drush/drush.php:0 0.0254 1303672 2. drush_main() /opt/drush/drush.php:37 0.2674 5107784 3. drush_bootstrap() /opt/drush/drush.php:71 0.2676 5109872 4. _drush_bootstrap_drupal_full() /opt/drush/includes/environment.inc:173 0.2676 5151032 5. drupal_bootstrap() /opt/drush/includes/environment.inc:655 0.3030 7739048 6. _drupal_bootstrap() /var/www/missmoti/includes/bootstrap.inc:989 0.3122 8855792 7. _drupal_bootstrap_full() /var/www/missmoti/includes/bootstrap.inc:1078 0.3445 12387320 8. module_load_all() /var/www/missmoti/includes/common.inc:2608 0.5194 32586544 9. drupal_load() /var/www/missmoti/includes/module.inc:14 0.5251 33361112 10. include_once('/var/www/missmoti/sites/all/modules/ubercart/uc_order/uc_order.module') /var/www/-----/includes/bootstrap.inc:617 Drush command could not be completed. In each error it shows me a back trace and I guess this default debugger I'm not aware of in Apache or my PHP config it eating up the memory. If anyone can help I"d be glad. Another error below: Fatal error: Call to undefined function dsm() in /var/www/-----/sites/all/modules/custom/gtpath/gtpath.module on line 180 Call Stack # Time Memory Function Location 1 0.0002 120144 {main}( ) ../index.php:0 2 1.7604 68224112 theme( ) ../index.php:36 3 2.0188 77346112 call_user_func_array ( ) ../theme.inc:658 4 2.0188 77347024 gtpath_preprocess_page( ) ../theme.inc:0 how do I deal with this default debugger? how do I turn it off??

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• How is conversion of float/double to int handled in printf?

  - by Sandip

  Consider this program int main() { float f = 11.22; double d = 44.55; int i,j; i = f; //cast float to int j = d; //cast double to int printf("i = %d, j = %d, f = %d, d = %d", i,j,f,d); //This prints the following: // i = 11, j = 44, f = -536870912, d = 1076261027 return 0; } Can someone explain why the casting from double/float to int works correctly in the first case, and does not work when done in printf? This program was compiled on gcc-4.1.2 on 32-bit linux machine. EDIT: Zach's answer seems logical, i.e. use of format specifiers to figure out what to pop off the stack. However then consider this follow up question: int main() { char c = 'd'; // sizeof c is 1, however sizeof character literal // 'd' is equal to sizeof(int) in ANSI C printf("lit = %c, lit = %d , c = %c, c = %d", 'd', 'd', c, c); //this prints: lit = d, lit = 100 , c = d, c = 100 //how does printf here pop off the right number of bytes even when //the size represented by format specifiers doesn't actually match //the size of the passed arguments(char(1 byte) & char_literal(4 bytes)) return 0; } How does this work?

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• x86 .net application with system.OutOfMemoryException

  - by Allen

  Hi,Guys I got OutOfMemoryException after the app running for 1 day, the app totally use 1.5G memory , all consumed by managed heap, gen 2 used 200mb , and LOB used 1.3mb, however the weired thing is, 900mb of space are Free. from perf counter I saw there had number of gen 2 gc collection happened, why GC collector cannot collect those 900mb free space in gen2 and LOB? I'm really appreicate for your help. following info are from windbg: 0:000> !eeheap -gc Number of GC Heaps: 1 generation 0 starts at 0x183153f0 generation 1 starts at 0x182aa834 generation 2 starts at 0x02131000 ephemeral segment allocation context: none segment begin allocated size 02130000 02131000 0312f284 0xffe284(16769668) 07750000 07751000 0874fc5c 0xffec5c(16772188) 09e30000 09e31000 0ae2fc2c 0xffec2c(16772140) 0b230000 0b231000 0c22ffec 0xffefec(16773100) 0c230000 0c231000 0d22f6f0 0xffe6f0(16770800) 0d230000 0d231000 0e22ea10 0xffda10(16767504) 0e230000 0e231000 0f22c1c4 0xffb1c4(16757188) 10390000 10391000 1138ddf4 0xffcdf4(16764404) 154e0000 154e1000 164da90c 0xff990c(16750860) 34aa0000 34aa1000 35a9dbfc 0xffcbfc(16763900) 7aca0000 7aca1000 7bc9edfc 0xffddfc(16768508) 49760000 49761000 4a75ef64 0xffdf64(16768868) 7bca0000 7bca1000 7cc99bac 0xff8bac(16747436) 17a70000 17a71000 183313fc 0x8c03fc(9176060) Large object heap starts at 0x03131000 segment begin allocated size 03130000 03131000 041250c8 0xff40c8(16728264) 08920000 08921000 099102f8 0xfef2f8(16708344) .... .... 4c760000 4c761000 4d71d578 0xfbc578(16500088) 1bb10000 1bb11000 1ca110d0 0xf000d0(15728848) 57760000 57761000 5862d7f8 0xecc7f8(15517688) Total Size: Size: 0x5ab13450 (1521562704) bytes. ------------------------------ GC Heap Size: Size: 0x5ab13450 (1521562704) bytes. 0:000> !dumpheap -stat total 0 objects Statistics: MT Count TotalSize Class Name 73037c78 1 12 System.Configuration.GenericEnumConverter 73036da0 1 12 System.Configuration.InfiniteIntConverter .... .... 69161c3c 35025 6809420 System.Windows.EffectiveValueEntry[] 69164748 54 12471072 MS.Internal.WeakEventTable+EventKey[] 710e2228 9540 190389260 System.Byte[] 710dd2b8 1317031 339257932 System.String 0035a670 6427 902224056 Free Total 3615631 objects

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• How do I read binary C++ protobuf data using Python protobuf?

  - by nbolton

  The Python version of Google protobuf gives us only: SerializeAsString() Where as the C++ version gives us both: SerializeToArray(...) SerializeAsString() We're writing to our C++ file in binary format, and we'd like to keep it this way. That said, is there a way of reading the binary data into Python and parsing it as if it were a string? Is this the correct way of doing it? binary = get_binary_data() binary_size = get_binary_size() string = None for i in range(len(binary_size)): string += i message = new MyMessage() message.ParseFromString(string) Update: Here's a new example, and a problem: message_length = 512 file = open('foobars.bin', 'rb') eof = False while not eof: data = file.read(message_length) eof = not data if not eof: foo_bar = FooBar() foo_bar.ParseFromString(data) When we get to the foo_bar.ParseFromString(data) line, I get this error: Exception Type: DecodeError Exception Value: Too many bytes when decoding varint. Update 2: It turns out, that the padding on the binary data was throwing protobuf off; too many bytes were being sent in, as the message suggests (in this case it was referring to the padding). This padding comes from using the C++ protobuf function, SerializeToArray on a fixed-length buffer. To eliminate this, I have used this temproary code: message_length = 512 file = open('foobars.bin', 'rb') eof = False while not eof: data = file.read(message_length) eof = not data string = '' for i in range(0, len(data)): byte = data[i] if byte != '\xcc': # yuck! string += data[i] if not eof: foo_bar = FooBar() foo_bar.ParseFromString(string) There is a design flaw here I think. I will re-implement my C++ code so that it writes variable length arrays to the binary file. As advised by the protobuf documentation, I will prefix each message with it's binary size so that I know how much to read when I'm opening the file with Python.

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• Android: Streaming audio over TCP Sockets

  - by user299988

  Hi, For my app, I need to record audio from MIC on an Android phone, and send it over TCP to the other android phone, where it needs to be played. I am using AudioRecord and AudioTrack class. This works great with a file - write audio to the file using DataOutputStream, and read from it using DataInputStream. However, if I obtain the same stream from a socket instead of a File, and try writing to it, I get an exception. I am at a loss to understand what could possibly be going wrong. Any help would be greatly appreciated. EDIT: The problem is same even if I try with larger buffer sizes (65535 bytes, 160000 bytes). This is the code: Recorder: int bufferSize = AudioRecord.getMinBufferSize(11025, , AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT); AudioRecord recordInstance = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize); byte[] tempBuffer = new byte[bufferSize]; recordInstance.startRecording(); while (/*isRecording*/) { bufferRead = recordInstance.read(tempBuffer, 0, bufferSize); dataOutputStreamInstance.write(tempBuffer); } The DataOutputStream above is obtained as: BufferedOutputStream buff = new BufferedOutputStream(out1); //out1 is the socket's outputStream DataOutputStream dataOutputStreamInstance = new DataOutputStream (buff); Could you please have a look, and let me know what is it that I could be doing wrong here? Thanks,

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• linux new/delete, malloc/free large memory blocks

  - by brian_mk

  Hi folks, We have a linux system (kubuntu 7.10) that runs a number of CORBA Server processes. The server software uses glibc libraries for memory allocation. The linux PC has 4G physical memory. Swap is disabled for speed reasons. Upon receiving a request to process data, one of the server processes allocates a large data buffer (using the standard C++ operator 'new'). The buffer size varies depening upon a number of parameters but is typically around 1.2G Bytes. It can be up to about 1.9G Bytes. When the request has completed, the buffer is released using 'delete'. This works fine for several consecutive requests that allocate buffers of the same size or if the request allocates a smaller size than the previous. The memory appears to be free'd ok - otherwise buffer allocation attempts would eventually fail after just a couple of requests. In any case, we can see the buffer memory being allocated and freed for each request using tools such as KSysGuard etc. The problem arises when a request requires a buffer larger than the previous. In this case, operator 'new' throws an exception. It's as if the memory that has been free'd from the first allocation cannot be re-allocated even though there is sufficient free physical memory available. If I kill and restart the server process after the first operation, then the second request for a larger buffer size succeeds. i.e. killing the process appears to fully release the freed memory back to the system. Can anyone offer an explanation as to what might be going on here? Could it be some kind of fragmentation or mapping table size issue? I am thinking of replacing new/delete with malloc/free and use mallopt to tune the way the memory is being released to the system. BTW - I'm not sure if it's relevant to our problem, but the server uses Pthreads that get created and destroyed on each processing request. Cheers, Brian.

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• Interface for reading variable length files with header and footer.

  - by John S

  I could use some hints or tips for a decent interface for reading file of special characteristics. The files in question has a header (~120 bytes), a body (1 byte - 3gb) and a footer (4 bytes). The header contains information about the body and the footer is only a simple CRC32-value of the body. I use Java so my idea was to extend the "InputStream" class and add a constructor such as "public MyInStream( InputStream in)" where I immediately read the header and the direct the overridden read()'s the body. Problem is, I can't give the user of the class the CRC32-value until the whole body has been read. Because the file can be 3gb large, putting it all in memory is a be an idea. Reading it all in to a temporary file is going to be a performance hit if there are many small files. I don't know how large the file is because the InputStream doesn't have to be a file, it could be a socket. Looking at it again, maybe extending InputStream is a bad idea. Thank you for reading the confused thoughts of a tired programmer. :)

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• When does an ARM7 processor increase its PC register?

  - by Summer_More_More_Tea

  Hi everyone: I'm thinking about this question for a time: when does an ARM7(with 3 pipelines) processor increase its PC register. I originally thought that after an instruction has been executed, the processor first check is there any exception in the last execution, then increase PC by 2 or 4 depending on current state. If an exception occur, ARM7 will change its running mode, store PC in the LR of current mode and begin to process current exception without modifying the PC register. But it make no sense when analyzing returning instructions. I can not work out why PC will be assigned LR when returning from an undefined-instruction-exception while LR-4 from prefetch-abort-exception, don't both of these exceptions happened at the decoding state? What's more, according to my textbook, PC will always be assigned LR-4 when returning from prefetch-abort-exception no matter what state the processor is(ARM or Thumb) before exception occurs. However, I think PC should be assigned LR-2 if the original state is Thumb, since a Thumb-instruction is 2 bytes long instead of 4 bytes which an ARM-instruction holds, and we just wanna roll-back an instruction in current state. Is there any flaws in my reasoning or something wrong with the textbook. Seems a long question. I really hope anyone can help me get the right answer. Thanks in advance.

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• c# calling process "cannot find the file specified"

  - by laura

  I'm a c# newbie so bear with me. I'm trying to call "pslist" from PsTools from a c# app, but I keep getting "The system cannot find the file specified". I thought I read somewhere on google that the exe should be in c:\windows\system32, so I tried that, still nothing. Even trying the full path to c:\windows\system32\PsList.exe is not working. I can open other things like notepad or regedit. Any ideas? C:\WINDOWS\system32dir C:\WINDOWS\SYSTEM32\PsList.exe Volume in drive C has no label. Volume Serial Number is ECC0-70AA Directory of C:\WINDOWS\SYSTEM32 04/27/2010 11:04 AM 231,288 PsList.exe 1 File(s) 231,288 bytes 0 Dir(s) 8,425,492,480 bytes free try { // Start the child process. Process p = new Process(); // Redirect the output stream of the child process. p.StartInfo.UseShellExecute = false; p.StartInfo.RedirectStandardOutput = true; //This works //p.StartInfo.FileName = @"C:\WINDOWS\regedit.EXE"; //This doesn't p.StartInfo.FileName = @"C:\WINDOWS\system32\PsList.exe"; p.Start(); // Do not wait for the child process to exit before // reading to the end of its redirected stream. p.WaitForExit(); // Read the output stream first and then wait. s1 = p.StandardOutput.ReadToEnd(); p.WaitForExit(); } catch (Exception ex) { Console.WriteLine("Exception Occurred :{0},{1}", ex.Message, ex.StackTrace.ToString()); Console.ReadLine(); }

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• recommended format to save time with MJD + BCD format in database

  - by pierr

  Hi, There is a time represented in MJD and BCD format with 5 bytes .I am wondering what is the recommended format to save this date-time in the sqlite database so that user can search against it ? My first attempt is to save it just as it is, that is a 5 bytes string. The user will use the same format to search and the result will be converted to unix time by the user with following code. However, later, I was suggested to save the time in the integer - the UTC time, for example. But I can not find a standard way to do the conversion. I feel this is a common issue and would like to hear your comments. time_t sidate_to_unixtime(unsigned char sidate[]) { int k = 0; struct tm tm; double mjd; /* check for the undefined value */ if ((sidate[0] == 0xff) && (sidate[1] == 0xff) && (sidate[2] == 0xff) && (sidate[3] == 0xff) && (sidate[4] == 0xff)) { return -1; } memset(&tm, 0, sizeof(tm)); mjd = (sidate[0] << 8) | sidate[1]; tm.tm_year = (int) ((mjd - 15078.2) / 365.25); tm.tm_mon = (int) (((mjd - 14956.1) - (int) (tm.tm_year * 365.25)) / 30.6001); tm.tm_mday = (int) mjd - 14956 - (int) (tm.tm_year * 365.25) - (int) (tm.tm_mon * 30.6001); if ((tm.tm_mon == 14) || (tm.tm_mon == 15)) k = 1; tm.tm_year += k; tm.tm_mon = tm.tm_mon - 2 - k * 12; tm.tm_sec = bcd_to_integer(sidate[4]); tm.tm_min = bcd_to_integer(sidate[3]); tm.tm_hour = bcd_to_integer(sidate[2]); return mktime(&tm); }

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• Is my method for avoiding dynamic_cast<> faster than dynamic_cast<> itself ?

  - by ereOn

  Hi, I was answering a question a few minutes ago and it raised to me another one: In one of my projects, I do some network message parsing. The messages are in the form of: [1 byte message type][2 bytes payload length][x bytes payload] The format and content of the payload are determined by the message type. I have a class hierarchy, based on a common class Message. To instanciate my messages, i have a static parsing method which gives back a Message* depending on the message type byte. Something like: Message* parse(const char* frame) { // This is sample code, in real life I obviously check that the buffer // is not NULL, and the size, and so on. switch(frame[0]) { case 0x01: return new FooMessage(); case 0x02: return new BarMessage(); } // Throw an exception here because the mesage type is unknown. } I sometimes need to access the methods of the subclasses. Since my network message handling must be fast, I decived to avoid dynamic_cast<> and I added a method to the base Message class that gives back the message type. Depending on this return value, I use a static_cast<> to the right child type instead. I did this mainly because I was told once that dynamic_cast<> was slow. However, I don't know exactly what it really does and how slow it is, thus, my method might be as just as slow (or slower) but far more complicated. What do you guys think of this design ? Is it common ? Is it really faster than using dynamic_cast<> ? Any detailed explanation of what happen under the hood when one use dynamic_cast<> is welcome !

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