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get quest episode number from start function instead of header

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This commit is contained in:
Martin Michelsen
2023-11-10 12:41:29 -08:00
parent 51ba23faa6
commit a0505176ec
3 changed files with 160 additions and 17 deletions
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src/QuestScript.cc
+153 -3
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@@ -168,6 +168,8 @@ static constexpr uint16_t F_GC_V3 = v_flag(V::GC_V3);
static constexpr uint16_t F_XB_V3 = v_flag(V::XB_V3);
static constexpr uint16_t F_GC_EP3 = v_flag(V::GC_EP3);
static constexpr uint16_t F_BB_V4 = v_flag(V::BB_V4);
static constexpr uint16_t F_RET = 0x1000;
static constexpr uint16_t F_SET_EPISODE = 0x2000;
static constexpr uint16_t F_PASS = 0x4000;
static constexpr uint16_t F_ARGS = 0x8000;
@@ -210,7 +212,7 @@ static const Arg AREA(INT32, 0, "area");
static const QuestScriptOpcodeDefinition opcode_defs[] = {
{0x0000, "nop", {}, F_V0_V4}, // Does nothing
{0x0001, "ret", {}, F_V0_V4}, // Pops new PC off stack
{0x0001, "ret", {}, F_V0_V4 | F_RET}, // Pops new PC off stack
{0x0002, "sync", {}, F_V0_V4}, // Stops execution for the current frame
{0x0003, "exit", {INT32}, F_V0_V4}, // Exits entirely
{0x0004, "thread", {SCRIPT16}, F_V0_V4}, // Starts a new thread
@@ -634,7 +636,7 @@ static const QuestScriptOpcodeDefinition opcode_defs[] = {
{0xF8B9, "chl_recovery", {}, F_V2_V4},
{0xF8BA, "load_guild_card_file_creation_time_to_flag_buf", {}, F_V2_V4},
{0xF8BB, "write_flag_buf_to_event_flags2", {REG}, F_V2_V4},
{0xF8BC, "set_episode", {INT32}, F_V3_V4},
{0xF8BC, "set_episode", {INT32}, F_V3_V4 | F_SET_EPISODE},
{0xF8C0, "file_dl_req", {INT32, CSTRING}, F_V3 | F_ARGS}, // Sends D7
{0xF8C0, "nop_F8C0", {INT32, CSTRING}, F_V4 | F_ARGS},
{0xF8C1, "get_dl_status", {REG}, F_V3},
@@ -1075,10 +1077,10 @@ std::string disassemble_quest_script(const void* data, size_t size, QuestScriptV
break;
}
case Type::REG_SET_FIXED: {
uint8_t first_reg = cmd_r.get_u8();
if (def->flags & F_PASS) {
throw logic_error("REG_SET_FIXED cannot be pushed to arg stack");
}
uint8_t first_reg = cmd_r.get_u8();
dasm_arg = string_printf("r%hhu-r%hhu", first_reg, static_cast<uint8_t>(first_reg + arg.count - 1));
break;
}
@@ -1473,3 +1475,151 @@ std::string disassemble_quest_script(const void* data, size_t size, QuestScriptV
lines.emplace_back(); // Add a \n on the end
return join(lines, "\n");
}
Episode find_quest_episode_from_script(const void* data, size_t size, QuestScriptVersion version) {
StringReader r(data, size);
bool use_wstrs = false;
size_t code_offset = 0;
size_t function_table_offset = 0;
Episode header_episode = Episode::NONE;
switch (version) {
case QuestScriptVersion::DC_NTE:
case QuestScriptVersion::DC_V1:
case QuestScriptVersion::DC_V2:
case QuestScriptVersion::PC_V2:
return Episode::EP1;
case QuestScriptVersion::GC_NTE:
case QuestScriptVersion::GC_V3:
case QuestScriptVersion::GC_EP3:
case QuestScriptVersion::XB_V3: {
const auto& header = r.get<PSOQuestHeaderGC>();
code_offset = header.code_offset;
function_table_offset = header.function_table_offset;
header_episode = episode_for_quest_episode_number(header.episode);
break;
}
case QuestScriptVersion::BB_V4: {
use_wstrs = true;
const auto& header = r.get<PSOQuestHeaderBB>();
code_offset = header.code_offset;
function_table_offset = header.function_table_offset;
header_episode = episode_for_quest_episode_number(header.episode);
break;
}
default:
throw logic_error("invalid quest version");
}
const auto& opcodes = opcodes_for_version(version);
unordered_set<Episode> found_episodes;
// The set_episode opcode should always be in the first function (0)
StringReader cmd_r = r.sub(code_offset + r.pget_u32l(function_table_offset));
while (!cmd_r.eof()) {
uint16_t opcode = cmd_r.get_u8();
if ((opcode & 0xFE) == 0xF8) {
opcode = (opcode << 8) | cmd_r.get_u8();
}
const QuestScriptOpcodeDefinition* def = nullptr;
try {
def = opcodes.at(opcode);
} catch (const out_of_range&) {
}
if (def == nullptr) {
throw runtime_error("unknown quest opcode");
}
if (def->flags & F_RET) {
break;
}
if (!(def->flags & F_ARGS)) {
for (const auto& arg : def->args) {
using Type = QuestScriptOpcodeDefinition::Argument::Type;
string dasm_arg;
switch (arg.type) {
case Type::LABEL16:
cmd_r.skip(2);
break;
case Type::LABEL32:
cmd_r.skip(4);
break;
case Type::LABEL16_SET:
if (def->flags & F_PASS) {
throw logic_error("LABEL16_SET cannot be pushed to arg stack");
}
cmd_r.skip(cmd_r.get_u8() * 2);
break;
case Type::REG:
cmd_r.skip(1);
break;
case Type::REG_SET:
if (def->flags & F_PASS) {
throw logic_error("REG_SET cannot be pushed to arg stack");
}
cmd_r.skip(cmd_r.get_u8());
break;
case Type::REG_SET_FIXED:
if (def->flags & F_PASS) {
throw logic_error("REG_SET_FIXED cannot be pushed to arg stack");
}
cmd_r.skip(1);
break;
case Type::INT8:
cmd_r.skip(1);
break;
case Type::INT16:
cmd_r.skip(2);
break;
case Type::INT32:
if (def->flags & F_SET_EPISODE) {
found_episodes.emplace(episode_for_quest_episode_number(cmd_r.get_u32l()));
} else {
cmd_r.skip(4);
}
break;
case Type::FLOAT32:
cmd_r.skip(4);
break;
case Type::CSTRING:
if (use_wstrs) {
for (uint16_t ch = cmd_r.get_u16l(); ch; ch = cmd_r.get_u16l()) {
}
} else {
for (uint8_t ch = cmd_r.get_u8(); ch; ch = cmd_r.get_u8()) {
}
}
break;
default:
throw logic_error("invalid argument type");
}
}
}
}
if (found_episodes.size() > 1) {
throw runtime_error("multiple episodes found");
} else if (found_episodes.size() == 1) {
return *found_episodes.begin();
} else {
return header_episode;
}
}
Episode episode_for_quest_episode_number(uint8_t episode_number) {
switch (episode_number) {
case 0x00:
case 0xFF:
return Episode::EP1;
case 0x01:
return Episode::EP2;
case 0x02:
return Episode::EP4;
default:
throw runtime_error(string_printf("invalid episode number %02hhX", episode_number));
}
}