Method HandleChecksum

src/engine/client/client.cpp:4218–4314

#endif

int CClient::HandleChecksum(int Conn, CUuid Uuid, CUnpacker *pUnpacker)
{
	int Start = pUnpacker->GetInt();
	int Length = pUnpacker->GetInt();
	if(pUnpacker->Error())
	{
		return 1;
	}
	if(Start < 0 || Length < 0 || Start > std::numeric_limits<int>::max() - Length)
	{
		return 2;
	}
	int End = Start + Length;
	int ChecksumBytesEnd = minimum(End, (int)sizeof(m_Checksum.m_aBytes));
	int FileStart = maximum(Start, (int)sizeof(m_Checksum.m_aBytes));
	unsigned char aStartBytes[sizeof(int32_t)];
	unsigned char aEndBytes[sizeof(int32_t)];
	uint_to_bytes_be(aStartBytes, Start);
	uint_to_bytes_be(aEndBytes, End);

	if(Start <= (int)sizeof(m_Checksum.m_aBytes))
	{
		mem_zero(&m_Checksum.m_Data.m_Config, sizeof(m_Checksum.m_Data.m_Config));
#define CHECKSUM_RECORD(Flags) (((Flags) & CFGFLAG_CLIENT) == 0 || ((Flags) & CFGFLAG_INSENSITIVE) != 0)
#define MACRO_CONFIG_INT(Name, ScriptName, Def, Min, Max, Flags, Desc) \
	if(CHECKSUM_RECORD(Flags)) \
	{ \
		m_Checksum.m_Data.m_Config.m_##Name = g_Config.m_##Name; \
	}
#define MACRO_CONFIG_COL(Name, ScriptName, Def, Flags, Desc) \
	if(CHECKSUM_RECORD(Flags)) \
	{ \
		m_Checksum.m_Data.m_Config.m_##Name = g_Config.m_##Name; \
	}
#define MACRO_CONFIG_STR(Name, ScriptName, Len, Def, Flags, Desc) \
	if(CHECKSUM_RECORD(Flags)) \
	{ \
		str_copy(m_Checksum.m_Data.m_Config.m_##Name, g_Config.m_##Name, sizeof(m_Checksum.m_Data.m_Config.m_##Name)); \
	}
#include <engine/shared/config_variables.h>
#undef CHECKSUM_RECORD
#undef MACRO_CONFIG_INT
#undef MACRO_CONFIG_COL
#undef MACRO_CONFIG_STR
	}
	if(End > (int)sizeof(m_Checksum.m_aBytes))
	{
		if(m_OwnExecutableSize == 0)
		{
			m_OwnExecutable = io_current_exe();
			// io_length returns -1 on error.
			m_OwnExecutableSize = m_OwnExecutable ? io_length(m_OwnExecutable) : -1;
		}
		// Own executable not available.
		if(m_OwnExecutableSize < 0)
		{
			return 3;
		}