metaforce/Runtime/Memory/CCircularBuffer.cpp

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#include "Runtime/Memory/CCircularBuffer.hpp"
namespace metaforce {
CCircularBuffer::CCircularBuffer(void* buf, s32 len, EOwnership ownership)
: x0_canDelete(buf != nullptr), x4_ptr(reinterpret_cast<u8*>(buf)), x8_bufferLen(len) {
if (ownership == EOwnership::Owned)
x0_canDelete = false;
}
CCircularBuffer::~CCircularBuffer() {
if (x0_canDelete) {
delete x4_ptr;
}
}
s32 CCircularBuffer::GetAllocatedAmount() const {
s32 res = x10_nextFreeAddr - xc_;
return (x14_ == -1) ? res : res + (x8_bufferLen - x14_);
}
bool CCircularBuffer::IsWrappedMemory(s32 offset, s32 len) {
return x14_ > -1 && x14_ >= offset && (x14_ < (offset + len));
}
void* CCircularBuffer::Alloc(s32 len) {
if ((x8_bufferLen - x10_nextFreeAddr) >= len && !IsWrappedMemory(x10_nextFreeAddr, len)) {
s32 offset = x10_nextFreeAddr;
x10_nextFreeAddr = offset + len;
return x4_ptr + offset;
} else if (xc_ >= len && !IsWrappedMemory(0, len)) {
u32 r3 = xc_;
xc_ = 0;
x10_nextFreeAddr = len;
x14_ = r3;
return x4_ptr;
}
return nullptr;
}
void CCircularBuffer::Free(void* ptr, s32 r5) {
if (x14_ <= -1) {
xc_ += r5;
} else if (ptr == x4_ptr) {
x14_ = -1;
xc_ = r5;
} else {
x14_ += r5;
}
if (x14_ != -1 || xc_ != x10_nextFreeAddr) {
return;
}
x10_nextFreeAddr = 0;
xc_ = 0;
}
} // namespace metaforce