Justin Marshall
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
#pragma once
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#include "../containers/staticlist.h"
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#include <cstdint>
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#include <cstring>
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template<int maxItems, int maxData>
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class idDataQueue {
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public:
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struct msgItem_t {
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int sequence;
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int length;
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int dataOffset;
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};
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idStaticList<msgItem_t, maxItems> items;
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int dataLength;
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std::uint8_t data[maxData];
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idDataQueue() : dataLength(0) {}
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bool Append(const int sequence, const std::uint8_t* first,
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const int firstLength, const std::uint8_t* second,
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const int secondLength) {
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if (firstLength < 0 || secondLength < 0
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|| items.Num() == items.Max()
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|| dataLength + firstLength + secondLength >= maxData) {
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return false;
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}
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msgItem_t* const item = items.Alloc();
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if (item == nullptr) return false;
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item->sequence = sequence;
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item->length = firstLength + secondLength;
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item->dataOffset = dataLength;
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if (firstLength > 0) {
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std::memcpy(&data[dataLength], first, firstLength);
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dataLength += firstLength;
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}
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if (secondLength > 0) {
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std::memcpy(&data[dataLength], second, secondLength);
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dataLength += secondLength;
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}
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return true;
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}
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void RemoveOlderThan(const int sequence) {
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int removeBytes = 0;
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while (items.Num() > 0 && items[0].sequence < sequence) {
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removeBytes += items[0].length;
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items.RemoveIndex(0);
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}
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if (removeBytes < dataLength) {
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if (removeBytes > 0) {
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std::memmove(data, data + removeBytes, dataLength - removeBytes);
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dataLength -= removeBytes;
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}
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} else {
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dataLength = 0;
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}
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int offset = 0;
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for (int index = 0; index < items.Num(); ++index) {
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items[index].dataOffset = offset;
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offset += items[index].length;
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}
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}
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};
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#if INTPTR_MAX == INT32_MAX
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static_assert(sizeof(idDataQueue<63, 8000>) == 8776,
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"Recovered idDataQueue<63,8000> ABI changed");
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static_assert(sizeof(idDataQueue<64, 65536>) == 66324,
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"Recovered idDataQueue<64,65536> ABI changed");
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#endif
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