91 lines
2.1 KiB
C++
91 lines
2.1 KiB
C++
#pragma once
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#include "../Common.h"
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#include <cstdio>
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#include <cstdint>
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#include <string>
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using std::string;
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namespace Feather::Network
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{
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// Class to read packet data, such as is produced by NetworkMessage
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class PacketReader
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{
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public:
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PacketReader(const uint8_t *const dataPtr)
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: m_data(dataPtr), m_length(ReadVarInt())
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{
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}
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inline uint8_t ReadByte()
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{
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return m_data[m_offset++];
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}
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inline int ReadVarInt()
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{
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int numRead = 0;
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int result = 0;
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uint8_t read;
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do
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{
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read = ReadByte();
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int value = (read & 0b01111111);
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result |= (value << (7 * numRead));
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numRead++;
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if (numRead > 5)
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{
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// complain
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//throw new RuntimeException("VarInt is too big");
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}
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} while ((read & 0b10000000) != 0);
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return result;
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}
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inline uint16_t ReadUnsignedShort()
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{
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return (ReadByte() << 8) | ReadByte();
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}
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inline int64_t ReadLong()
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{
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int64_t value = 0;
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// FIXME
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value |= (ReadByte() << 56);
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value |= (ReadByte() << 48);
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value |= (ReadByte() << 40);
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value |= (ReadByte() << 32);
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value |= (ReadByte() << 24);
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value |= (ReadByte() << 16);
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value |= (ReadByte() << 8);
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value |= (ReadByte() << 0);
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return value;
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}
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string ReadString()
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{
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int size = ReadVarInt();
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string str;
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for (int i = 0; i < size; i++) {
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str += ReadByte();
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}
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//printf("Read string of length %d: %s\n", size, str);
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return str;
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}
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uint32_t Length() const { return m_length; }
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private:
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const uint8_t *const m_data;
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const uint32_t m_length;
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uint32_t m_offset = 0;
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};
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} |