93 lines
1.7 KiB
C
93 lines
1.7 KiB
C
#if PlatformIsWindows
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////////////////////////////////
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//~ Windows headers
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#define WIN32_LEAN_AND_MEAN
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#define UNICODE
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#include <Windows.h>
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////////////////////////////////
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//~ Memory allocation
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//- Reserve
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void *ReserveMemory(u64 size)
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{
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void *ptr = VirtualAlloc(0, size, MEM_RESERVE, PAGE_NOACCESS);
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return ptr;
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}
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void ReleaseMemory(void *address)
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{
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VirtualFree(address, 0, MEM_RELEASE);
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}
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//- Commit
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void *CommitMemory(void *address, u64 size)
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{
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void *ptr = VirtualAlloc(address, size, MEM_COMMIT, PAGE_READWRITE);
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return ptr;
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}
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void DecommitMemory(void *address, u64 size)
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{
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VirtualFree(address, size, MEM_DECOMMIT);
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}
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//- Protect
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void SetMemoryReadonly(void *address, u64 size)
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{
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DWORD old;
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VirtualProtect(address, size, PAGE_READONLY, &old);
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}
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void SetMemoryReadWrite(void *address, u64 size)
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{
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DWORD old;
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VirtualProtect(address, size, PAGE_READWRITE, &old);
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}
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#else
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# error Memory allocation not implemented for this platform
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#endif
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////////////////////////////////
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//~ Memory operations
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void *CopyBytes(void *dst, void *src, u64 count)
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{
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char *dst_pchar = dst;
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char *src_pchar = src;
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for (u64 i = 0; i < count; ++i)
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{
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dst_pchar[i] = src_pchar[i];
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}
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return dst;
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}
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void *SetBytes(void *dst, u8 c, u64 count)
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{
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char *dst_pchar = dst;
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for (u64 i = 0; i < count; ++i)
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{
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dst_pchar[i] = (char)c;
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}
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return dst;
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}
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i32 CmpBytes(void *p1, void *p2, u64 count)
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{
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i32 result = 0;
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char *p1_pchar = p1;
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char *p2_pchar = p2;
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for (u64 i = 0; i < count; ++i)
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{
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result = p1_pchar[i] - p2_pchar[i];
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if (result != 0)
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{
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break;
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}
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}
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return result;
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}
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