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level_completion.cc
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level_completion.cc
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#include <inttypes.h>
#include <stdio.h>
#include <stdexcept>
#include <string>
#include <vector>
#include <phosg/Filesystem.hh>
#include "level.hh"
#include "level_completion.hh"
using namespace std;
level_completion::level_completion() : state(NotAttempted),
frames(0xFFFFFFFFFFFFFFFF), extra_items(0), extra_bombs(0),
cleared_space(0), attenuated_space(0xFFFFFFFFFFFFFFFF),
entropy(0xFFFFFFFFFFFFFFFF), rewind_count(0xFFFFFFFFFFFFFFFF) { }
level_completion::level_completion(const level_completion_v1& v1) :
state(v1.state), frames(v1.frames), extra_items(v1.extra_items),
extra_bombs(v1.extra_bombs), cleared_space(v1.cleared_space),
attenuated_space(v1.attenuated_space), entropy(0xFFFFFFFFFFFFFFFF),
rewind_count(0xFFFFFFFFFFFFFFFF) { }
level_completion::level_completion(const level_completion_v2& v2) :
state(v2.state), frames(v2.frames), extra_items(v2.extra_items),
extra_bombs(v2.extra_bombs), cleared_space(v2.cleared_space),
attenuated_space(v2.attenuated_space), entropy(v2.entropy),
rewind_count(0xFFFFFFFFFFFFFFFF) { }
vector<level_completion> load_level_completion_state_v1(const string& filename) {
try {
auto f = fopen_unique(filename.c_str(), "rb");
uint64_t num = fstat(fileno(f.get())).st_size / sizeof(level_completion_v1);
vector<level_completion_v1> lc(num);
freadx(f.get(), lc.data(), lc.size() * sizeof(level_completion_v1));
vector<level_completion> ret;
for (const auto& lcv1 : lc) {
ret.emplace_back(lcv1);
}
return ret;
} catch (const cannot_open_file&) {
return vector<level_completion>();
}
}
vector<level_completion> load_level_completion_state(const string& filename) {
try {
auto f = fopen_unique(filename.c_str(), "rb");
size_t file_size = fstat(fileno(f.get())).st_size;
uint64_t version = 0;
freadx(f.get(), &version, sizeof(version));
if (version == 2) {
uint64_t num = (file_size - sizeof(version)) / sizeof(level_completion_v2);
fprintf(stderr, "loading %" PRIu64 " level completion states v2\n", num);
vector<level_completion_v2> lc(num);
freadx(f.get(), lc.data(), lc.size() * sizeof(level_completion_v2));
vector<level_completion> ret;
for (const auto& lcv2 : lc) {
ret.emplace_back(lcv2);
}
return ret;
} else if (version == 3) {
uint64_t num = (file_size - sizeof(version)) / sizeof(level_completion);
fprintf(stderr, "loading %" PRIu64 " level completion states v3\n", num);
vector<level_completion> ret(num);
freadx(f.get(), ret.data(), ret.size() * sizeof(level_completion));
return ret;
} else {
fprintf(stderr, "level completion state file is in an unknown format\n");
return vector<level_completion>();
}
} catch (const cannot_open_file&) {
fprintf(stderr, "level completion state file %s is missing\n", filename.c_str());
return vector<level_completion>();
}
}
void save_level_completion_state(const string& filename, const vector<level_completion>& lc) {
auto f = fopen_unique(filename.c_str(), "wb");
uint64_t version = 3;
fwritex(f.get(), &version, sizeof(version));
fwritex(f.get(), lc.data(), lc.size() * sizeof(level_completion));
}
class BitSerializer {
public:
BitSerializer() : bit_offset(0) { }
~BitSerializer() = default;
void write(bool v) {
if (!(this->bit_offset & 7)) {
this->serialized_data.resize(this->serialized_data.size() + 1, 0);
}
uint8_t* current = reinterpret_cast<uint8_t*>(
&this->serialized_data[this->bit_offset >> 3]);
if (v) {
*current |= (0x80 >> (this->bit_offset & 7));
}
this->bit_offset++;
}
void write(const void* data, size_t size) {
if (this->bit_offset & 7) {
throw invalid_argument("raw data write not on byte boundary");
}
this->serialized_data.append(reinterpret_cast<const char*>(data), size);
this->bit_offset += (size << 3);
}
const string& data() {
return this->serialized_data;
}
private:
string serialized_data;
size_t bit_offset;
};
class BitDeserializer {
public:
BitDeserializer(const string& data) : serialized_data(data), bit_offset(0) { }
~BitDeserializer() = default;
bool read() {
if ((this->bit_offset >> 3) >= this->serialized_data.size()) {
throw out_of_range("reached end of stream");
}
bool ret = (this->serialized_data[this->bit_offset >> 3] & (0x80 >> (this->bit_offset & 7))) ? true : false;
this->bit_offset++;
return ret;
}
string read(size_t size) {
if (this->bit_offset & 7) {
throw invalid_argument("raw data write not on byte boundary");
}
string ret = this->serialized_data.substr(this->bit_offset >> 3, size);
this->bit_offset += (ret.size() << 3);
return ret;
}
private:
string serialized_data;
size_t bit_offset;
};
deque<struct player_actions> load_recording(const string& filename) {
BitDeserializer des(load_file(filename));
string version_str = des.read(sizeof(uint32_t));
if (version_str != "\x45\x43\x45\x43") {
throw invalid_argument("incorrect version");
}
string count_str = des.read(sizeof(uint32_t));
if (count_str.size() != sizeof(uint32_t)) {
throw invalid_argument("count is missing");
}
uint32_t count = *reinterpret_cast<const uint32_t*>(count_str.data());
deque<struct player_actions> recording;
for (uint32_t x = 0; x < count; x++) {
struct player_actions actions;
actions.drop_bomb = des.read();
uint8_t impulse = des.read() << 2;
impulse |= des.read() << 1;
impulse |= des.read();
actions.impulse = static_cast<enum player_impulse>(impulse);
recording.emplace_back(actions);
}
return recording;
}
void save_recording(const string& filename, const deque<struct player_actions>& recording) {
BitSerializer ser;
uint32_t version = 0x43454345;
ser.write(&version, sizeof(version));
uint32_t count = recording.size();
ser.write(&count, sizeof(count));
for (const auto& actions : recording) {
ser.write(actions.drop_bomb);
uint8_t impulse = actions.impulse;
ser.write((impulse >> 2) & 1);
ser.write((impulse >> 1) & 1);
ser.write(impulse & 1);
}
save_file(filename, ser.data());
}