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Memory.c

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/******************************************************************
        ANet_Daemon/Common/Memory.c
        Memory management for the run-time wrapper of the daemon.
        
        Part of the ANet project.
        
        Distributed under GPL: http://www.gnu.org/copyleft/gpl.html
******************************************************************/

#include "Memory.h"
#include <stdlib.h>

/*
  Current memory format:
  ANetMemoryTag is a memory location.
  The first 4 bytes are the size of the block.
  The remaining bytes is the data itself.
*/

UInt32 IsTagValid(ANetMemoryTag tag)
{
  return (tag != 0); 
}

ANetMemoryTag NewMemoryBlock(UInt32 size, UInt32 flags)
{
  // Soft-limit of 500MB assumed
  UInt32 *mem;
  if (size & 0xC0000000)
  {
    return (ANetMemoryTag)(0);
  }
  mem = (UInt32*)(malloc(size + sizeof(UInt32)));
  mem[0] = size;
  return (ANetMemoryTag)(mem);
}

UInt32 DeleteMemoryBlock(ANetMemoryTag tag)
{
  if (!tag)
    return 1;
  free((char*)(tag));
  return 0;
}

UInt32 GetMemoryBlockSize(ANetMemoryTag tag)
{
  return *(UInt32*)(tag);
}

UInt32 ResolveMemoryTag(ANetMemoryTag tag, UInt8 **ptr)
{
  // Soft-limit of 500MB assumed
  if (!tag)
    return 1;
  if (!ptr)
    return 2;
  if (*((UInt32*)(tag)) & 0xC0000000)
    return 1;
  *ptr = (UInt8*)((UInt32*)(tag) + 1);
  return 0;
}

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