#Purebasic image memory allocation

[sojust]

Purebasic image memory allocation

#PUREBASIC IMAGE MEMORY ALLOCATION MANUAL#

#PUREBASIC IMAGE MEMORY ALLOCATION SOFTWARE#

#PUREBASIC IMAGE MEMORY ALLOCATION CODE#

In fact, typical MATLAB users don't even worry about array sizes, as MATLAB will automatically resize arrays as required. The MATLAB interpreter handles details of array memory and data types, leaving the algorithm developer free to concentrate on the algorithm itself. In MATLAB, you don't need to think about memory allocation.

#PUREBASIC IMAGE MEMORY ALLOCATION SOFTWARE#

Many embedded software projects forbid the use of dynamic memory allocation entirely. Given these issues, embedded software developers traditionally frown upon dynamic memory allocation, especially in software for mission-critical systems and avionics.

Ĝustom memory allocators, such as memory pool managers, avoid these problems, but introduce more complexity and possible defects into the system.

Repeatedly allocating and freeing memory blocks of different sizes eventually leads to fragmentation.

Searching the heap for an appropriate size block takes an indeterminate amount of time, which is unacceptable for “hard” real-time systems.

#PUREBASIC IMAGE MEMORY ALLOCATION MANUAL#

Manual memory management is error prone, and heap-related software problems, such as memory leaks, are particularly difficult to debug.

The flexibility of dynamic memory allocation, however, comes at a price: Listing 3 shows an example of dynamic allocation. Because you have complete control over memory usage, dynamic allocation allows more efficient use of memory than either static or stack allocation. The memory is drawn from the heap, using C's malloc and free commands. Listing 2 illustrates stack allocation for variable “array.”įinally, in dynamic allocation, you manually allocate memory at run time. Like static allocation, the size of variables on the stack must be specified at compile time. It can be difficult to predict how large the overall stack needs to be, and stack overflow can be difficult to detect. However, the stack is limited to a finite area of memory. This method uses memory more efficiently than static allocation, because memory is allocated and released as needed by each function. The memory for the currently executing function is maintained on a stack, and when the function exits, the memory on the stack is released. In stack allocation, the processor allocates a fixed amount of memory when a function is invoked. This topic has been covered extensively by Niall Murphy (“Safe Memory Utilization,” April 2000, ), but we can summarize some of the pertinent points about embedded memory usage relevant to MATLAB. In embedded software, one of the biggest concerns is memory usage. Translation techniques have already been discussed in a series of articles republished on (, and tools now exist for automatic MATLAB-to-C translation.

#PUREBASIC IMAGE MEMORY ALLOCATION CODE#

Translating MATLAB code to C is not a straightforward process. In this article, we'll look at how data storage in MATLAB translates to memory allocation in C for embedded systems. Embedded systems, in which many algorithms eventually end up as software, can impose additional requirements on memory usage. MATLAB's syntax and toolbox functions greatly facilitate algorithm exploration and refinement.Īt some point, however, a MATLAB algorithm must be ported to another implementation, typically C. When developing algorithms for communication, signal processing, and controls, MATLAB is the de facto standard development environment.

[purejust]

Purebasic image memory allocation

Salts by definition are meant to be cryptographically secure random data, not static/hard-coded constants. Saki wrote: ↑ Mon 8:57 pmThis is a static salt. Repeat : Until WaitWindowEvent()=#PB_Event_CloseWindow MessageRequester("Hint", "Decrypted Image not usable") WindowHeight(window_ID)/2-ImageHeight(image_ID)/2, WindowWidth(window_ID)/2-ImageWidth(image_ID)/2, If UCase(GetExtensionPart(source_path_image$))"GIF" : ResizeImage(image_ID, 300, 300) : EndIfĭefine image_gadget_ID=ImageGadget(#PB_Any, If recreate_image_file : If Not image_ID : MessageRequester("Hint", "Can not create a decrypted image") : EndIf : End : EndIfĭefine window_ID=OpenWindow(#PB_Any, 0, 0, 650, 400, "Decrypted Image", #PB_Window_SystemMenu|#PB_Window_ScreenCentered) UsePNGImageDecoder() : UseJPEGImageDecoder() : UseTIFFImageDecoder() : UseGIFImageDecoder()ĭefine recreate_image_file=0 Recreate a decrypted image from a encrypted imageĭefine image_ID=LoadImage_and_Decrypt_BF(source_path_image$, password$, recreate_image_file) If Not image_ID : ProcedureReturn -6 : EndIf : ProcedureReturn image_ID Protected image_ID=CatchImage(#PB_Any, *buffer_1, length) : FreeMemory(*buffer_1) If WriteData(file, *buffer_1, length)length : CloseFile(file) : FreeMemory(*buffer_1) : ProcedureReturn -22 : EndIf If Not file : ProcedureReturn -21 : EndIf Source_path_image$=RemoveString(source_path_image$, crypt_extender$, #PB_String_NoCase)įile=CreateFile(#PB_Any, source_path_image$) If Not AESDecoder(*buffer, *buffer_1, length, 256, #PB_Cipher_CBC)įreeMemory(*buffer) : FreeMemory(*buffer_1) : CloseFile(file) : ProcedureReturn -9 Protected *buffer_1=AllocateMemory(length) : If Not *buffer_1 : FreeMemory(*buffer) : ProcedureReturn -9 : EndIf If ReadData(file, *buffer, length)length : FreeMemory(*buffer) : CloseFile(file) : ProcedureReturn -21 : EndIf Repeat 32 2))) : ii+SizeOf(character)16 : CloseFile(file) : ProcedureReturn -21 : EndIf : FileSeek(file, 0) Protected fixed$=StringFingerprint(password$+"%$(s4DäÖÄö", #PB_Cipher_SHA3), i, ii : Dim register.q(5) UseSHA3Fingerprint() By Saki - Advanced AES CBC mode image Decrypter with crypt randomized IV Procedure LoadImage_and_Decrypt_BF(source_path_image$, password$, recreate_file=0, crypt_extender$=" ") LoadImage_Encrypt_and_Save_BF(source_path_image$, destination_path_image$, password$) Repeat 32 2))) : ii+SizeOf(character)length+16 : FreeMemory(*buffer_1) : CloseFile(file) : ProcedureReturn -22 : EndIfĭefine source_path_image$=OpenFileRequester("Select a image", "", "", 0) : If source_path_image$="" : End : EndIfĭefine destination_path_image$=source_path_image$ Protected extension$="."+GetExtensionPart(source_path_image$)ĭestination_path_image$=GetPathPart(source_path_image$)+GetFilePart(source_path_image$)ĭestination_path_image$=RemoveString(destination_path_image$, extension$) : destination_path_image$+crypt_extender$+extension$ Protected fixed$=StringFingerprint(password$+"%$(s4DäÖÄö", #PB_Cipher_SHA3), i, ii, *buffer : Dim register.q(5) UseSHA3Fingerprint() By Saki - Advanced AES CBC mode image Encrypter with crypt randomized IV Procedure LoadImage_Encrypt_and_Save_BF(source_path_image$, destination_path_image$, password$, crypt_extender$=" ")