--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/event_log.c	Sat May 09 23:39:44 2020 -0700
@@ -0,0 +1,746 @@
+#ifdef _WIN32
+#define WINVER 0x501
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#else
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <netinet/tcp.h>
+#endif
+
+#include <errno.h>
+#include "event_log.h"
+#include "util.h"
+#include "blastem.h"
+#include "saves.h"
+#include "zlib/zlib.h"
+
+enum {
+	CMD_GAMEPAD_DOWN,
+	CMD_GAMEPAD_UP,
+};
+
+static uint8_t active, fully_active;
+static FILE *event_file;
+static serialize_buffer buffer;
+static uint8_t *compressed;
+static size_t compressed_storage;
+static z_stream output_stream;
+static uint32_t last;
+
+static void event_log_common_init(void)
+{
+	init_serialize(&buffer);
+	compressed_storage = 128*1024;
+	compressed = malloc(compressed_storage);
+	deflateInit(&output_stream, 9);
+	output_stream.avail_out = compressed_storage;
+	output_stream.next_out = compressed;
+	output_stream.avail_in = 0;
+	output_stream.next_in = buffer.data;
+	last = 0;
+	active = 1;
+}
+
+static uint8_t multi_count;
+static size_t multi_start;
+static void finish_multi(void)
+{
+	buffer.data[multi_start] |= multi_count - 2;
+	multi_count = 0;
+}
+
+static void file_finish(void)
+{
+	fwrite(compressed, 1, output_stream.next_out - compressed, event_file);
+	output_stream.next_out = compressed;
+	output_stream.avail_out = compressed_storage;
+	int result = deflate(&output_stream, Z_FINISH);
+	if (Z_STREAM_END != result) {
+		fatal_error("Final deflate call returned %d\n", result);
+	}
+	fwrite(compressed, 1, output_stream.next_out - compressed, event_file);
+	fclose(event_file);
+}
+
+static const char el_ident[] = "BLSTEL\x02\x00";
+void event_log_file(char *fname)
+{
+	event_file = fopen(fname, "wb");
+	if (!event_file) {
+		warning("Failed to open event file %s for writing\n", fname);
+		return;
+	}
+	fwrite(el_ident, 1, sizeof(el_ident) - 1, event_file);
+	event_log_common_init();
+	fully_active = 1;
+	atexit(file_finish);
+}
+
+typedef struct {
+	uint8_t  *send_progress;
+	int      sock;
+	uint8_t  players[1]; //TODO: Expand when support for multiple players per remote is added
+	uint8_t  num_players;
+} remote;
+
+static int listen_sock;
+static remote remotes[7];
+static int num_remotes;
+static uint8_t available_players[7] = {2,3,4,5,6,7,8};
+static int num_available_players = 7;
+void event_log_tcp(char *address, char *port)
+{
+	struct addrinfo request, *result;
+	socket_init();
+	memset(&request, 0, sizeof(request));
+	request.ai_family = AF_INET;
+	request.ai_socktype = SOCK_STREAM;
+	request.ai_flags = AI_PASSIVE;
+	getaddrinfo(address, port, &request, &result);
+	
+	listen_sock = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
+	if (listen_sock < 0) {
+		warning("Failed to open event log listen socket on %s:%s\n", address, port);
+		goto cleanup_address;
+	}
+	int param = 1;
+	setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&param, sizeof(param));
+	if (bind(listen_sock, result->ai_addr, result->ai_addrlen) < 0) {
+		warning("Failed to bind event log listen socket on %s:%s\n", address, port);
+		socket_close(listen_sock);
+		goto cleanup_address;
+	}
+	if (listen(listen_sock, 3) < 0) {
+		warning("Failed to listen for event log remotes on %s:%s\n", address, port);
+		socket_close(listen_sock);
+		goto cleanup_address;
+	}
+	socket_blocking(listen_sock, 0);
+	event_log_common_init();
+cleanup_address:
+	freeaddrinfo(result);
+}
+
+static uint8_t *system_start;
+static size_t system_start_size;
+void event_system_start(system_type stype, vid_std video_std, char *name)
+{
+	if (!active) {
+		return;
+	}
+	save_int8(&buffer, stype);
+	save_int8(&buffer, video_std);
+	size_t name_len = strlen(name);
+	if (name_len > 255) {
+		name_len = 255;
+	}
+	save_int8(&buffer, name_len);
+	save_buffer8(&buffer, name, strlen(name));
+	if (listen_sock) {
+		system_start = malloc(buffer.size);
+		system_start_size = buffer.size;
+		memcpy(system_start, buffer.data, buffer.size);
+	} else {
+		//system start header is never compressed, so write to file immediately
+		fwrite(buffer.data, 1, buffer.size, event_file);
+	}
+	buffer.size = 0;
+}
+
+//header formats
+//Single byte: 4 bit type, 4 bit delta (16-31)
+//Three Byte: 8 bit type, 16-bit delta
+//Four byte: 8-bit type, 24-bit signed delta
+#define FORMAT_3BYTE 0xE0
+#define FORMAT_4BYTE 0xF0
+static uint8_t last_event_type = 0xFF;
+static uint32_t last_delta;
+static void event_header(uint8_t type, uint32_t cycle)
+{
+	uint32_t delta = cycle - last;
+	if (multi_count) {
+		if (type != last_event_type || delta != last_delta) {
+			finish_multi();
+		} else {
+			++multi_count;
+			if (multi_count == 17) {
+				finish_multi();
+				last_event_type = 0xFF;
+			}
+			return;
+		}
+	} else if (type == last_event_type && delta == last_delta && type != EVENT_FLUSH) {
+		//make some room
+		save_int8(&buffer, 0);
+		//shift existing command
+		memmove(buffer.data + multi_start + 1, buffer.data + multi_start, buffer.size - multi_start - 1);
+		buffer.data[multi_start] = EVENT_MULTI << 4;
+		multi_count = 2;
+		return;
+	}
+	multi_start = buffer.size;
+	last_event_type = type;
+	last_delta = delta;
+	
+	if (delta > 65535) {
+		save_int8(&buffer, FORMAT_4BYTE | type);
+		save_int8(&buffer, delta >> 16);
+		save_int16(&buffer, delta);
+	} else if (delta >= 16 && delta < 32) {
+		save_int8(&buffer, type << 4 | (delta - 16));
+	} else {
+		save_int8(&buffer, FORMAT_3BYTE | type);
+		save_int16(&buffer, delta);
+	}
+}
+
+void event_cycle_adjust(uint32_t cycle, uint32_t deduction)
+{
+	if (!fully_active) {
+		return;
+	}
+	event_header(EVENT_ADJUST, cycle);
+	last = cycle - deduction;
+	save_int32(&buffer, deduction);
+}
+
+static uint8_t next_available_player(void)
+{
+	uint8_t lowest = 0xFF;
+	int lowest_index = -1;
+	for (int i = 0; i < num_available_players; i++)
+	{
+		if (available_players[i] < lowest) {
+			lowest = available_players[i];
+			lowest_index = i;
+		}
+	}
+	if (lowest_index >= 0) {
+		available_players[lowest_index] = available_players[num_available_players - 1];
+		--num_available_players;
+	}
+	return lowest;
+}
+
+static void flush_socket(void)
+{
+	int remote_sock = accept(listen_sock, NULL, NULL);
+	if (remote_sock != -1) {
+		if (num_remotes == 7) {
+			socket_close(remote_sock);
+		} else {
+			printf("remote %d connected\n", num_remotes);
+			uint8_t player = next_available_player();
+			remotes[num_remotes++] = (remote){
+				.sock = remote_sock,
+				.send_progress = NULL,
+				.players = {player},
+				.num_players = player == 0xFF ? 0 : 1
+			};
+			current_system->save_state = EVENTLOG_SLOT + 1;
+		}
+	}
+	uint8_t *min_progress = compressed;
+	for (int i = 0; i < num_remotes; i++) {
+		if (remotes[i].send_progress) {
+			uint8_t recv_buffer[1500];
+			int bytes = recv(remotes[i].sock, recv_buffer, sizeof(recv_buffer), 0);
+			for (int j = 0; j < bytes; j++)
+			{
+				uint8_t cmd = recv_buffer[j];
+				switch(cmd)
+				{
+				case CMD_GAMEPAD_DOWN:
+				case CMD_GAMEPAD_UP: {
+					++j;
+					if (j < bytes) {
+						uint8_t button = recv_buffer[j];
+						uint8_t pad = (button >> 5) - 1;
+						button &= 0x1F;
+						if (pad <  remotes[i].num_players) {
+							pad = remotes[i].players[pad];
+							if (cmd == CMD_GAMEPAD_DOWN) {
+								current_system->gamepad_down(current_system, pad, button);
+							} else {
+								current_system->gamepad_up(current_system, pad, button);
+							}
+						}
+					} else {
+						warning("Received incomplete command %X\n", cmd);
+					}
+					break;
+				}
+				default:
+					warning("Unrecognized remote command %X\n", cmd);
+					j = bytes;
+				}
+			}
+			int sent = 1;
+			while (sent && output_stream.next_out > remotes[i].send_progress)
+			{
+				sent = send(remotes[i].sock, remotes[i].send_progress, output_stream.next_out - remotes[i].send_progress, 0);
+				if (sent >= 0) {
+					remotes[i].send_progress += sent;
+				} else if (!socket_error_is_wouldblock()) {
+					socket_close(remotes[i].sock);
+					for (int j = 0; j < remotes[i].num_players; j++) {
+						available_players[num_available_players++] = remotes[i].players[j];
+					}
+					remotes[i] = remotes[num_remotes-1];
+					num_remotes--;
+					if (!num_remotes) {
+						//last remote disconnected, reset buffers/deflate
+						fully_active = 0;
+						deflateReset(&output_stream);
+						output_stream.next_out = compressed;
+						output_stream.avail_out = compressed_storage;
+						buffer.size = 0;
+					}
+					i--;
+					break;
+				}
+				if (remotes[i].send_progress > min_progress) {
+					min_progress = remotes[i].send_progress;
+				}
+			}
+		}
+	}
+	if (min_progress == output_stream.next_out) {
+		output_stream.next_out = compressed;
+		output_stream.avail_out = compressed_storage;
+		for (int i = 0; i < num_remotes; i++) {
+			if (remotes[i].send_progress) {
+				remotes[i].send_progress = compressed;
+			}
+		}
+	}
+}
+
+uint8_t wrote_since_last_flush;
+void event_log(uint8_t type, uint32_t cycle, uint8_t size, uint8_t *payload)
+{
+	if (!fully_active) {
+		return;
+	}
+	event_header(type, cycle);
+	last = cycle;
+	save_buffer8(&buffer, payload, size);
+	if (!multi_count) {
+		last_event_type = 0xFF;
+		output_stream.avail_in = buffer.size - (output_stream.next_in - buffer.data);
+		int result = deflate(&output_stream, Z_NO_FLUSH);
+		if (result != Z_OK) {
+			fatal_error("deflate returned %d\n", result);
+		}
+		if (listen_sock) {
+			if ((output_stream.next_out - compressed) > 1280 || !output_stream.avail_out) {
+				flush_socket();
+				wrote_since_last_flush = 1;
+			}
+		} else if (!output_stream.avail_out) {
+			fwrite(compressed, 1, compressed_storage, event_file);
+			output_stream.next_out = compressed;
+			output_stream.avail_out = compressed_storage;
+		}
+		if (!output_stream.avail_in) {
+			buffer.size = 0;
+			output_stream.next_in = buffer.data;
+		}
+	}
+}
+
+static uint32_t last_word_address;
+void event_vram_word(uint32_t cycle, uint32_t address, uint16_t value)
+{
+	uint32_t delta = address - last_word_address;
+	if (delta < 256) {
+		uint8_t buffer[3] = {delta, value >> 8, value};
+		event_log(EVENT_VRAM_WORD_DELTA, cycle, sizeof(buffer), buffer);
+	} else {
+		uint8_t buffer[5] = {address >> 16, address >> 8, address, value >> 8, value};
+		event_log(EVENT_VRAM_WORD, cycle, sizeof(buffer), buffer);
+	}
+	last_word_address = address;
+}
+
+static uint32_t last_byte_address;
+void event_vram_byte(uint32_t cycle, uint16_t address, uint8_t byte, uint8_t auto_inc)
+{
+	uint32_t delta = address - last_byte_address;
+	if (delta == 1) {
+		event_log(EVENT_VRAM_BYTE_ONE, cycle, sizeof(byte), &byte);
+	} else if (delta == auto_inc) {
+		event_log(EVENT_VRAM_BYTE_AUTO, cycle, sizeof(byte), &byte);
+	} else if (delta < 256) {
+		uint8_t buffer[2] = {delta, byte};
+		event_log(EVENT_VRAM_BYTE_DELTA, cycle, sizeof(buffer), buffer);
+	} else {
+		uint8_t buffer[3] = {address >> 8, address, byte};
+		event_log(EVENT_VRAM_BYTE, cycle, sizeof(buffer), buffer);
+	}
+	last_byte_address = address;
+}
+
+static size_t send_all(int sock, uint8_t *data, size_t size, int flags)
+{
+	size_t total = 0, sent = 1;
+	while(sent > 0 && total < size)
+	{
+		sent = send(sock, data + total, size - total, flags);
+		if (sent > 0) {
+			total += sent;
+		}
+	}
+	return total;
+}
+
+void deflate_flush(uint8_t full)
+{
+	output_stream.avail_in = buffer.size - (output_stream.next_in - buffer.data);
+	uint8_t force = full;
+	while (output_stream.avail_in || force)
+	{
+		if (!output_stream.avail_out) {
+			size_t old_storage = compressed_storage;
+			uint8_t *old_compressed = compressed;
+			compressed_storage *= 2;
+			compressed = realloc(compressed, compressed_storage);
+			output_stream.next_out = compressed + old_storage;
+			output_stream.avail_out = old_storage;
+			for (int i = 0; i < num_remotes; i++) {
+				if (remotes[i].send_progress) {
+					remotes[i].send_progress = compressed + (remotes[i].send_progress - old_compressed);
+				}
+			}
+		}
+		int result = deflate(&output_stream, full ? Z_FINISH : Z_SYNC_FLUSH);
+		if (result != (full ? Z_STREAM_END : Z_OK)) {
+			fatal_error("deflate returned %d\n", result);
+		}
+		if (full && result == Z_STREAM_END) {
+			result = deflateReset(&output_stream);
+			if (result != Z_OK) {
+				fatal_error("deflateReset returned %d\n", result);
+			}
+		}
+		force = 0;
+	}
+	output_stream.next_in = buffer.data;
+	buffer.size = 0;
+}
+
+void event_state(uint32_t cycle, serialize_buffer *state)
+{
+	if (!fully_active) {
+		last = cycle;
+	}
+	uint8_t header[] = {
+		EVENT_STATE << 4, last >> 24, last >> 16, last >> 8, last,
+		last_word_address >> 16, last_word_address >> 8, last_word_address,
+		last_byte_address >> 8, last_byte_address,
+		state->size >> 16, state->size >> 8, state->size
+	};
+	uint8_t sent_system_start = 0;
+	for (int i = 0; i < num_remotes; i++)
+	{
+		if (!remotes[i].send_progress) {
+			if (send_all(remotes[i].sock, system_start, system_start_size, 0) == system_start_size) {
+				sent_system_start = 1;
+			} else {
+				socket_close(remotes[i].sock);
+				remotes[i] = remotes[num_remotes-1];
+				num_remotes--;
+				i--;
+			}
+		}
+	}
+	if (sent_system_start) {
+		if (fully_active) {
+			if (multi_count) {
+				finish_multi();
+			}
+			//full flush is needed so new and old clients can share a stream
+			deflate_flush(1);
+		}
+		save_buffer8(&buffer, header, sizeof(header));
+		save_buffer8(&buffer, state->data, state->size);
+		size_t old_compressed_size = output_stream.next_out - compressed;
+		deflate_flush(1);
+		size_t state_size = output_stream.next_out - compressed - old_compressed_size;
+		for (int i = 0; i < num_remotes; i++) {
+			if (!remotes[i].send_progress) {
+				if (send_all(remotes[i].sock, compressed + old_compressed_size, state_size, 0) == state_size) {
+					remotes[i].send_progress = compressed + old_compressed_size;
+					socket_blocking(remotes[i].sock, 0);
+					int flag = 1;
+					setsockopt(remotes[i].sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&flag, sizeof(flag));
+					fully_active = 1;
+				} else {
+					socket_close(remotes[i].sock);
+					remotes[i] = remotes[num_remotes-1];
+					num_remotes--;
+					i--;
+				}
+			}
+		}
+		output_stream.next_out = compressed + old_compressed_size;
+		output_stream.avail_out = compressed_storage - old_compressed_size;
+	}
+}
+
+void event_flush(uint32_t cycle)
+{
+	if (!active) {
+		return;
+	}
+	if (fully_active) {
+		event_header(EVENT_FLUSH, cycle);
+		last = cycle;
+		
+		deflate_flush(0);
+	}
+	if (event_file) {
+		fwrite(compressed, 1, output_stream.next_out - compressed, event_file);
+		fflush(event_file);
+		output_stream.next_out = compressed;
+		output_stream.avail_out = compressed_storage;
+	} else if (listen_sock) {
+		flush_socket();
+		wrote_since_last_flush = 0;
+	}
+}
+
+void event_soft_flush(uint32_t cycle)
+{
+	if (!fully_active || wrote_since_last_flush || event_file) {
+		return;
+	}
+	event_header(EVENT_FLUSH, cycle);
+	last = cycle;
+	
+	deflate_flush(0);
+	flush_socket();
+}
+
+static void init_event_reader_common(event_reader *reader)
+{
+	reader->last_cycle = 0;
+	reader->repeat_event = 0xFF;
+	reader->storage = 512 * 1024;
+	init_deserialize(&reader->buffer, malloc(reader->storage), reader->storage);
+	reader->buffer.size = 0;
+	memset(&reader->input_stream, 0, sizeof(reader->input_stream));
+	
+}
+
+void init_event_reader(event_reader *reader, uint8_t *data, size_t size)
+{
+	reader->socket = 0;
+	reader->last_cycle = 0;
+	reader->repeat_event = 0xFF;
+	init_event_reader_common(reader);
+	uint8_t name_len = data[1];
+	reader->buffer.size = name_len + 2;
+	memcpy(reader->buffer.data, data, reader->buffer.size);
+	reader->input_stream.next_in = data + reader->buffer.size;
+	reader->input_stream.avail_in = size - reader->buffer.size;
+	
+	int result = inflateInit(&reader->input_stream);
+	if (Z_OK != result) {
+		fatal_error("inflateInit returned %d\n", result);
+	}
+	reader->input_stream.next_out = reader->buffer.data + reader->buffer.size;
+	reader->input_stream.avail_out = reader->storage - reader->buffer.size;
+	result = inflate(&reader->input_stream, Z_NO_FLUSH);
+	if (Z_OK != result && Z_STREAM_END != result) {
+		fatal_error("inflate returned %d\n", result);
+	}
+	reader->buffer.size = reader->input_stream.next_out - reader->buffer.data;
+}
+
+void init_event_reader_tcp(event_reader *reader, char *address, char *port)
+{
+	struct addrinfo request, *result;
+	socket_init();
+	memset(&request, 0, sizeof(request));
+	request.ai_family = AF_INET;
+	request.ai_socktype = SOCK_STREAM;
+	request.ai_flags = AI_PASSIVE;
+	getaddrinfo(address, port, &request, &result);
+	
+	reader->socket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
+	if (reader->socket < 0) {
+		fatal_error("Failed to create socket for event log connection to %s:%s\n", address, port);
+	}
+	if (connect(reader->socket, result->ai_addr, result->ai_addrlen) < 0) {
+		fatal_error("Failed to connect to %s:%s for event log stream\n", address, port);
+	}
+	
+	init_event_reader_common(reader);
+	reader->socket_buffer_size = 256 * 1024;
+	reader->socket_buffer = malloc(reader->socket_buffer_size);
+	
+	while(reader->buffer.size < 3 || reader->buffer.size < 3 + reader->buffer.data[2])
+	{
+		int bytes = recv(reader->socket, reader->buffer.data + reader->buffer.size, reader->storage - reader->buffer.size, 0);
+		if (bytes < 0) {
+			fatal_error("Failed to receive system init from %s:%s\n", address, port);
+		}
+		reader->buffer.size += bytes;
+	}
+	size_t init_msg_len = 3 + reader->buffer.data[2];
+	memcpy(reader->socket_buffer, reader->buffer.data + init_msg_len, reader->buffer.size - init_msg_len);
+	reader->input_stream.next_in = reader->socket_buffer;
+	reader->input_stream.avail_in = reader->buffer.size - init_msg_len;
+	reader->buffer.size = init_msg_len;
+	int res = inflateInit(&reader->input_stream);
+	if (Z_OK != res) {
+		fatal_error("inflateInit returned %d\n", res);
+	}
+	reader->input_stream.next_out = reader->buffer.data + init_msg_len;
+	reader->input_stream.avail_out = reader->storage - init_msg_len;
+	res = inflate(&reader->input_stream, Z_NO_FLUSH);
+	if (Z_OK != res && Z_BUF_ERROR != res) {
+		fatal_error("inflate returned %d in init_event_reader_tcp\n", res);
+	}
+	int flag = 1;
+	setsockopt(reader->socket, IPPROTO_TCP, TCP_NODELAY, (const char *)&flag, sizeof(flag));
+}
+
+static void read_from_socket(event_reader *reader)
+{
+	if (reader->socket_buffer_size - reader->input_stream.avail_in < 128 * 1024) {
+		reader->socket_buffer_size *= 2;
+		uint8_t *new_buf = malloc(reader->socket_buffer_size);
+		memcpy(new_buf, reader->input_stream.next_in, reader->input_stream.avail_in);
+		free(reader->socket_buffer);
+		reader->socket_buffer = new_buf;
+		reader->input_stream.next_in = new_buf;
+	} else if (
+		reader->input_stream.next_in - reader->socket_buffer >= reader->input_stream.avail_in 
+		&& reader->input_stream.next_in - reader->socket_buffer + reader->input_stream.avail_in >= reader->socket_buffer_size/2
+	) {
+		memmove(reader->socket_buffer, reader->input_stream.next_in, reader->input_stream.avail_in);
+		reader->input_stream.next_in = reader->socket_buffer;
+	}
+	uint8_t *space_start = reader->input_stream.next_in + reader->input_stream.avail_in;
+	size_t space = (reader->socket_buffer + reader->socket_buffer_size) - space_start;
+	int bytes = recv(reader->socket, space_start, space, 0);
+	if (bytes >= 0) {
+		reader->input_stream.avail_in += bytes;
+	} else if (!socket_error_is_wouldblock()) {
+		fatal_error("Connection closed, error = %X\n", socket_last_error());
+	}
+}
+
+static void inflate_flush(event_reader *reader)
+{
+	if (reader->buffer.cur_pos > reader->storage / 2) {
+		memmove(reader->buffer.data, reader->buffer.data + reader->buffer.cur_pos, reader->buffer.size - reader->buffer.cur_pos);
+		reader->buffer.size -= reader->buffer.cur_pos;
+		reader->buffer.cur_pos = 0;
+		reader->input_stream.next_out = reader->buffer.data + reader->buffer.size;
+		reader->input_stream.avail_out = reader->storage - reader->buffer.size;
+	}
+	int result = inflate(&reader->input_stream, Z_SYNC_FLUSH);
+	if (Z_OK != result && Z_STREAM_END != result) {
+		fatal_error("inflate returned %d\n", result);
+	}
+	reader->buffer.size = reader->input_stream.next_out - reader->buffer.data;
+	if (result == Z_STREAM_END && (reader->socket || reader->input_stream.avail_in)) {
+		inflateReset(&reader->input_stream);
+		if (reader->input_stream.avail_in) {
+			inflate_flush(reader);
+		}
+	}
+	
+}
+
+void reader_ensure_data(event_reader *reader, size_t bytes)
+{
+	if (reader->buffer.size - reader->buffer.cur_pos < bytes) {
+		if (reader->input_stream.avail_in) {
+			inflate_flush(reader);
+		}
+		if (reader->socket) {
+			while (reader->buffer.size - reader->buffer.cur_pos < bytes) {
+				read_from_socket(reader);
+				inflate_flush(reader);
+			}
+		}
+	}
+}
+
+uint8_t reader_next_event(event_reader *reader, uint32_t *cycle_out)
+{
+	if (reader->repeat_remaining) {
+		reader->repeat_remaining--;
+		*cycle_out = reader->last_cycle + reader->repeat_delta;
+		reader->last_cycle = *cycle_out;
+		return reader->repeat_event;
+	}
+	reader_ensure_data(reader, 1);
+	uint8_t header = load_int8(&reader->buffer);
+	uint8_t ret;
+	uint32_t delta;
+	uint8_t multi_start = 0;
+	if ((header & 0xF0) == (EVENT_MULTI << 4)) {
+		reader->repeat_remaining = (header & 0xF) + 1;
+		multi_start = 1;
+		reader_ensure_data(reader, 1);
+		header = load_int8(&reader->buffer);
+	}
+	if ((header & 0xF0) < FORMAT_3BYTE) {
+		delta = (header & 0xF) + 16;
+		ret = header >> 4;
+	} else if ((header & 0xF0) == FORMAT_3BYTE) {
+		reader_ensure_data(reader, 2);
+		delta = load_int16(&reader->buffer);
+		ret = header & 0xF;
+	} else {
+		reader_ensure_data(reader, 3);
+		delta = load_int8(&reader->buffer) << 16;
+		//sign extend 24-bit delta to 32-bit
+		if (delta & 0x800000) {
+			delta |= 0xFF000000;
+		}
+		delta |= load_int16(&reader->buffer);
+		ret = header & 0xF;
+	}
+	if (multi_start) {
+		reader->repeat_event = ret;
+		reader->repeat_delta = delta;
+	}
+	*cycle_out = reader->last_cycle + delta;
+	reader->last_cycle = *cycle_out;
+	if (ret == EVENT_ADJUST) {
+		reader_ensure_data(reader, 4);
+		size_t old_pos = reader->buffer.cur_pos;
+		uint32_t adjust = load_int32(&reader->buffer);
+		reader->buffer.cur_pos = old_pos;
+		reader->last_cycle -= adjust;
+	} else if (ret == EVENT_STATE) {
+		reader_ensure_data(reader, 8);
+		reader->last_cycle = load_int32(&reader->buffer);
+		reader->last_word_address = load_int8(&reader->buffer) << 16;
+		reader->last_word_address |= load_int16(&reader->buffer);
+		reader->last_byte_address = load_int16(&reader->buffer);
+	}
+	return ret;
+}
+
+uint8_t reader_system_type(event_reader *reader)
+{
+	return load_int8(&reader->buffer);
+}
+
+void reader_send_gamepad_event(event_reader *reader, uint8_t pad, uint8_t button, uint8_t down)
+{
+	uint8_t buffer[] = {down ? CMD_GAMEPAD_DOWN : CMD_GAMEPAD_UP, pad << 5 | button};
+	//TODO: Deal with the fact that we're not in blocking mode so this may not actually send all
+	//if the buffer is full
+	send_all(reader->socket, buffer, sizeof(buffer), 0);
+}