dolphin/Source/Core/Common/PcapFile.cpp

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// Copyright 2014 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
#include <chrono>
#include "Common/CommonTypes.h"
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#include "Common/IOFile.h"
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#include "Common/PcapFile.h"
namespace Common
{
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namespace
{
const u32 PCAP_MAGIC = 0xa1b2c3d4;
const u16 PCAP_VERSION_MAJOR = 2;
const u16 PCAP_VERSION_MINOR = 4;
const u32 PCAP_CAPTURE_LENGTH = 65535;
// Designed to be directly written into the PCAP file. The PCAP format is
// endian independent, so this works just fine.
#pragma pack(push, 1)
struct PCAPHeader
{
u32 magic_number;
u16 version_major;
u16 version_minor;
s32 tz_offset; // Offset in seconds from the GMT timezone.
u32 ts_accuracy; // In practice, 0.
u32 capture_length; // Size at which we truncate packets.
u32 data_link_type;
};
struct PCAPRecordHeader
{
u32 ts_sec;
u32 ts_usec;
u32 size_in_file; // Size after eventual truncation.
u32 real_size; // Size before eventual truncation.
};
#pragma pack(pop)
} // namespace
void PCAP::AddHeader(u32 link_type)
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{
PCAPHeader hdr = {PCAP_MAGIC, PCAP_VERSION_MAJOR, PCAP_VERSION_MINOR, 0,
0, PCAP_CAPTURE_LENGTH, link_type};
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m_fp->WriteBytes(&hdr, sizeof(hdr));
}
void PCAP::AddPacket(const u8* bytes, size_t size)
{
std::chrono::system_clock::time_point now(std::chrono::system_clock::now());
auto ts = now.time_since_epoch();
PCAPRecordHeader rec_hdr = {
(u32)std::chrono::duration_cast<std::chrono::seconds>(ts).count(),
(u32)(std::chrono::duration_cast<std::chrono::microseconds>(ts).count() % 1000000), (u32)size,
(u32)size};
m_fp->WriteBytes(&rec_hdr, sizeof(rec_hdr));
m_fp->WriteBytes(bytes, size);
}
} // namespace Common