79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
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#pragma once
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#include <cstring>
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#include <span>
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#include <spdlog/spdlog.h>
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namespace tw::net {
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/**
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* Circular byte buffer.
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*/
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class ByteBufferReader {
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public:
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ByteBufferReader(std::span<std::byte> target) : buffer(target), readOffset(0) {}
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ByteBufferReader(std::span<const std::byte> target) : buffer(target), readOffset(0) {}
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size_t peek_bytes(void* dst, size_t size, size_t offset = 0) {
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if(remaining() - offset < size) {
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spdlog::warn("Could not peek entire frame, remaining: {}/{}", remaining() - offset, size);
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return 0;
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}
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size_t cursor = readOffset + offset;
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// if(cursor + size <= buffer.size()) {
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std::memcpy(dst, buffer.data() + cursor, size);
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// } else {
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// size_t firstPart = buffer.size() - cursor;
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// std::memcpy(dst, buffer.data() + cursor, firstPart);
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// std::memcpy((std::byte*)dst + firstPart, buffer.data(), size - firstPart);
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// }
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return size;
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}
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template<typename T>
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size_t pop_bytes(T* dst) {
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return pop_bytes(dst, sizeof(T));
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}
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size_t pop_bytes(void* dst, size_t size) {
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size_t peeked = peek_bytes(dst, size);
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if(peeked < size) {
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spdlog::warn("Could not read entire frame, peeked only: {}/{}", peeked, size);
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return 0;
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}
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skip(size);
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return size;
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}
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size_t pop_bytes(std::span<std::byte> dst) {
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return pop_bytes(dst.data(), dst.size());
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}
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size_t position() const {
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return readOffset;
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}
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size_t remaining() const {
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return buffer.size() - readOffset;
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}
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void reset() {
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readOffset = 0;
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}
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void skip(size_t bytes) {
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readOffset = (readOffset + std::min(bytes, remaining()));
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}
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private:
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std::span<const std::byte> buffer;
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size_t readOffset = 0;
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};
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} // namespace tw::net
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