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Memory utility

Ikarus utility functions, for memory management and manipulation.

Initialization

The best way to initialize all Ikarus functions is to call MEM_InitAll() in the Init_Global() initialization function.

Warning

If you want to use Ikarus in Gothic 1, it is best to define your own Init_Global() function and call it from every world initialization function.

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MEM_InitAll();

Implementation

Ikarus.d on GitHub

Functions

MEM_Alloc

Allocates a specified amount of memory and returns a pointer to the allocated memory area.

Danger

Gothic does not and cannot retain a reference to this memory area or release it, even when destroying the session. Therefore, memory should only be reserved under certain conditions:

  • It is guaranteed to exist and can be released again with MEM_Free after loading a save game.
  • Gothic is aware of this memory area and independently releases it.

It might be possible to create new objects with this function and permanently integrate them into the object structure of Gothic. However, extreme caution is advised, as object structures cannot be used, and manual handling is required.

This function is well-suited for building small elements like list items and integrating them into existing lists. The memory allocated by this function is always initialized to zero. 

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func int MEM_Alloc(var int amount)
Parameters
  • var int amount
    The amount of bytes to allocate

Return value

The function returns a pointer to the allocated memory area.

MEM_Realloc

Allocates a memory area of ​​size newsize and returns a pointer to this memory area. The memory area from location ptr is released.

If newsize >= oldsize, the first oldsize bytes from the old memory area are transferred to the new one. The additional memory is initialized with zero.

If newsize <= oldsize, all bytes of the new memory area are initialized with the corresponding values ​​of the old memory area.

This function is intended to create an allocated memory area enlarge or reduce. Existing data remains naturally way received. 

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func int MEM_Realloc(var int ptr, var int oldsize, var int newsize)
Parameters
  • var int ptr
    The original pointer to the memory block
  • var int oldsize
    The size of the original memory block
  • var int newsize
    The size of the new memory block

Return value

The function returns a pointer to the modified memory area.

MEM_Free

Releases an allocated memory area.

Danger

Great caution is advised, especially when attempting to destroy engine objects, as no destructors are called!

Releasing small things such as list elements can be done easily. 

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func void MEM_Free(var int ptr)
Parameters
  • var int ptr
    Pointer to the released memory block

MEM_Copy

Copies a specified number of words from the source address to the destination address. 

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func void MEM_Copy(var int src, var int dst, var int wordcount)
Parameters
  • var int src
    The source address to copy from
  • var int dst
    The destination address to copy to
  • var int wordCount
    The number of words to copy

MEM_CopyWords

Alias to MEM_Copy. Copies a specified number of words from the source address to the destination address. 

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func void MEM_CopyWords(var int src, var int dst, var int wordcount)
Parameters
  • var int src
    The source address to copy from
  • var int dst
    The destination address to copy to
  • var int wordCount
    The number of words to copy

MEM_CopyBytes

Copies a specified number of bytes from the source address to the destination address 

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func void MEM_CopyBytes(var int src, var int dst, var int byteCount)
Parameters
  • var int src
    The source address to copy from
  • var int dst
    The destination address to copy to
  • var int byteCount
    The number of bytes to copy

MEM_Swap

Swaps a specified number of words between the source address and the destination address. 

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func void MEM_Swap(var int src, var int dst, var int wordCount)
Parameters
  • var int src
    The source address to swap from
  • var int dst
    The destination address to swap to
  • var int wordCount
    The number of words to swap

MEM_SwapWords

Alias to MEM_Swap. Swaps a specified number of words between the source address and the destination address. 

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func void MEM_SwapWords(var int src, var int dst, var int wordCount)
Parameters
  • var int src
    The source address to swap from
  • var int dst
    The destination address to swap to
  • var int wordCount
    The number of words to swap

MEM_SwapBytes

Swaps a specified number of bytes between the source address and the destination address. 

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func void MEM_SwapBytes(var int src, var int dst, var int byteCount)
Parameters
  • var int src
    The source address to swap from
  • var int dst
    The destination address to swap to
  • var int byteCount
    The number of bytes to swap

MEM_Clear

Sets a specified number of bytes in memory to zero. 

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func void MEM_Clear(var int ptr, var int size)
Parameters
  • var int ptr
    The memory address to start clearing from
  • var int size
    The number of bytes to clear

MEM_Compare

Compares a specified number of words between two memory blocks. 

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func int MEM_Compare(var int ptr0, var int ptr1, var int wordCount)
Parameters
  • var int ptr0
    The first memory block to compare
  • var int ptr1
    The second memory block to compare
  • var int wordCount
    The number of words to compare

Return value

The function returns TRUE if the memory blocks are equal, FALSE is returned otherwise.

MEM_CompareWords

Alias to MEM_Compare. Compares a specified number of words between two memory blocks. 

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func int MEM_CompareWords(var int ptr0, var int ptr1, var int wordCount)
Parameters
  • var int ptr0
    The first memory block to compare
  • var int ptr1
    The second memory block to compare
  • var int wordCount
    The number of words to compare

Return value

The function returns TRUE if the memory blocks are equal, FALSE is returned otherwise.

MEM_CompareBytes

Compares a specified number of bytes between two memory blocks. 

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func int MEM_CompareBytes(var int ptr1, var int ptr2, var int byteCount)
Parameters
  • var int ptr0
    The first memory block to compare
  • var int ptr1
    The second memory block to compare
  • var int wordCount
    The number of bytes to compare

Return value

The function returns TRUE if the memory blocks are equal, FALSE is returned otherwise.