s1-mod/src/client/component/imagefiles.cpp

#include <std_include.hpp>
#include "loader/component_loader.hpp"

#include "console.hpp"
#include "filesystem.hpp"
#include "fastfiles.hpp"
#include "scheduler.hpp"
#include "imagefiles.hpp"

#include "game/game.hpp"

#include <utils/hook.hpp>
#include <utils/string.hpp>
#include <utils/io.hpp>
#include <utils/concurrency.hpp>

#define CUSTOM_IMAGE_FILE_INDEX 96

namespace imagefiles
{
	namespace
	{
		utils::memory::allocator image_file_allocator;
		std::unordered_map<std::string, HANDLE> image_file_handles;

		std::string get_image_file_name()
		{
			return fastfiles::get_current_fastfile();
		}
		
		namespace mp
		{
			struct image_file_unk
			{
				char __pad0[112]; // 120 in H1
			};

			std::unordered_map<std::string, image_file_unk*> image_file_unk_map;

			void* get_image_file_unk_mp(unsigned int index)
			{
				if (index != CUSTOM_IMAGE_FILE_INDEX)
				{
					return &reinterpret_cast<image_file_unk*>(
						SELECT_VALUE(0x0, 0x143DC4E90))[index];
				}

				const auto name = get_image_file_name();
				if (image_file_unk_map.find(name) == image_file_unk_map.end())
				{
					const auto unk = image_file_allocator.allocate<image_file_unk>();
					image_file_unk_map[name] = unk;
					return unk;
				}

				return image_file_unk_map[name];
			}
		}

		/*
		namespace sp
		{
			struct image_file_unk
			{
				char __pad0[96];
			};

			std::unordered_map<std::string, image_file_unk*> image_file_unk_map;

			void* get_image_file_unk_mp(unsigned int index)
			{
				if (index != CUSTOM_IMAGE_FILE_INDEX)
				{
					return &reinterpret_cast<image_file_unk*>(
						SELECT_VALUE(0x0, 0x143DC4E90))[index];
				}

				const auto name = get_image_file_name();
				if (image_file_unk_map.find(name) == image_file_unk_map.end())
				{
					const auto unk = image_file_allocator.allocate<image_file_unk>();
					image_file_unk_map[name] = unk;
					return unk;
				}

				return image_file_unk_map[name];
			}
		}
		*/

		HANDLE get_image_file_handle(unsigned int index)
		{
			if (index != CUSTOM_IMAGE_FILE_INDEX)
			{
				return reinterpret_cast<HANDLE*>(
					SELECT_VALUE(0x0, 0x143B74E80))[index];
			}

			const auto name = get_image_file_name();
			return image_file_handles[name];
		}

		void db_create_gfx_image_stream_stub(utils::hook::assembler& a)
		{
			const auto handle_is_open = a.newLabel();

			a.movzx(eax, cx);
			a.mov(esi, eax);
			a.imul(rsi, 0x70);
			a.add(rsi, r15);

			a.push(rax);
			a.push(rax);
			a.pushad64();
			a.mov(rcx, rax);
			a.call_aligned(mp::get_image_file_unk_mp);
			a.mov(qword_ptr(rsp, 0x80), rax);
			a.popad64();
			a.pop(rax);
			a.mov(rsi, rax);
			a.pop(rax);

			a.push(rax);
			a.push(rax);
			a.pushad64();
			a.mov(rcx, rax);
			a.call_aligned(get_image_file_handle);
			a.mov(qword_ptr(rsp, 0x80), rax);
			a.popad64();
			a.pop(rax);
			a.mov(r12, rax);
			a.pop(rax);

			a.cmp(r12, r13);
			a.jnz(handle_is_open);
			a.jmp(SELECT_VALUE(0x0, 0x140279C8B));

			a.bind(handle_is_open);
			a.jmp(SELECT_VALUE(0x0, 0x140279CDB));
		}

		void* pakfile_open_stub(void* /*handles*/, unsigned int count, int is_imagefile, 
			unsigned int index, short is_localized)
		{
#ifdef DEBUG
			console::info("Opening %s%d.pak (localized:%d)\n", is_imagefile ? "imagefile" : "soundfile", index, is_localized);
#endif

			if (index != CUSTOM_IMAGE_FILE_INDEX)
			{
				return utils::hook::invoke<void*>(
					SELECT_VALUE(0x0, 0x1404CC180),
					SELECT_VALUE(0x0, 0x143B74E80), 
					count, is_imagefile, index, is_localized
				);
			}

			const auto name = get_image_file_name();
			const auto handle = game::Sys_CreateFile(is_localized ? game::SF_PAKFILE_LOC : game::SF_PAKFILE, utils::string::va("%s.pak", name.data()));
			if (handle != nullptr)
			{
				image_file_handles[name] = handle;
			}
			return handle;
		}

		int com_sprintf_stub(char* buffer, const int len, const char* fmt, unsigned int index)
		{
			if (index != CUSTOM_IMAGE_FILE_INDEX)
			{
				return game::Com_sprintf(buffer, len, fmt, index);
			}

			const auto name = get_image_file_name();
			return game::Com_sprintf(buffer, len, "%s.pak", name.data());
		}
	}

	void close_custom_handles()
	{
		for (const auto& handle : image_file_handles)
		{
			if (handle.second != nullptr)
			{
				utils::hook::invoke<void>(0x140608A20, handle.second); // Sys_CloseFile
			}
		}

		image_file_handles.clear();
		//sp::image_file_unk_map.clear();
		mp::image_file_unk_map.clear();
		image_file_allocator.clear();
	}

	void close_handle(const std::string& fastfile)
	{
		if (!image_file_handles.contains(fastfile))
		{
			return;
		}

		const auto handle = image_file_handles[fastfile];
		if (handle != nullptr)
		{
			utils::hook::invoke<void>(0x140608A20, handle);
		}

		image_file_handles.erase(fastfile);
		if (game::environment::is_sp())
		{
			//image_file_allocator.free(sp::image_file_unk_map[fastfile]);
			//sp::image_file_unk_map.erase(fastfile);
		}
		else
		{
			image_file_allocator.free(mp::image_file_unk_map[fastfile]);
			mp::image_file_unk_map.erase(fastfile);
		}
	}

	class component final : public component_interface
	{
	public:
		void post_unpack() override
		{
			if (!game::environment::is_mp())
			{
				return;
			}

			utils::hook::jump(SELECT_VALUE(0x0, 0x140279C79),
				utils::hook::assemble(db_create_gfx_image_stream_stub), true);
			utils::hook::call(SELECT_VALUE(0x0, 0x140279CBD), pakfile_open_stub);
			utils::hook::call(SELECT_VALUE(0x0, 0x140279C9F), com_sprintf_stub);
		}
	};
}

REGISTER_COMPONENT(imagefiles::component)