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Be backwards compatible with old savestates

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This commit is contained in:
Ilari Liusvaara 2011-11-24 09:57:23 +02:00
parent 0236a1d606
commit fde7c4e09a
1 changed files with 45 additions and 3 deletions
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48
src/core/moviefile.cpp
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@ -106,6 +106,43 @@ std::vector<char> read_raw_file(zip_reader& r, const std::string& member) throw(
return out;
}
uint64_t decode_uint64(unsigned char* buf)
{
return ((uint64_t)buf[0] << 56) |
((uint64_t)buf[1] << 48) |
((uint64_t)buf[2] << 40) |
((uint64_t)buf[3] << 32) |
((uint64_t)buf[4] << 24) |
((uint64_t)buf[5] << 16) |
((uint64_t)buf[6] << 8) |
((uint64_t)buf[7]);
}
uint32_t decode_uint32(unsigned char* buf)
{
return ((uint32_t)buf[0] << 24) |
((uint32_t)buf[1] << 16) |
((uint32_t)buf[2] << 8) |
((uint32_t)buf[3]);
}
void read_moviestate_file(zip_reader& r, const std::string& file, uint64_t& save_frame, uint64_t& lagged_frames,
std::vector<uint32_t>& pollcounters) throw(std::bad_alloc, std::runtime_error)
{
unsigned char buf[512];
auto s = read_raw_file(r, file);
if(s.size() != sizeof(buf))
throw std::runtime_error("Invalid moviestate file");
memcpy(buf, &s[0], sizeof(buf));
//Interesting offsets: 32-39: Current frame, 40-47: Lagged frames, 48-447: Poll counters. All bigendian.
save_frame = decode_uint64(buf + 32);
lagged_frames = decode_uint64(buf + 40);
pollcounters.resize(100);
for(unsigned i = 0; i < 100; i++)
pollcounters[i] = decode_uint32(buf + 48 + 4 * i);
}
void read_authors_file(zip_reader& r, std::vector<std::pair<std::string, std::string>>& authors) throw(std::bad_alloc,
std::runtime_error)
{
@ -326,9 +363,14 @@ moviefile::moviefile(const std::string& movie) throw(std::bad_alloc, std::runtim
rtc_subsecond = movie_rtc_subsecond;
if(r.has_member("savestate")) {
is_savestate = true;
read_numeric_file(r, "saveframe", save_frame, true);
read_numeric_file(r, "lagcounter", lagged_frames, true);
read_pollcounters(r, "pollcounters", pollcounters);
if(r.has_member("moviestate"))
//Backwards compat stuff.
read_moviestate_file(r, "moviestate", save_frame, lagged_frames, pollcounters);
else {
read_numeric_file(r, "saveframe", save_frame, true);
read_numeric_file(r, "lagcounter", lagged_frames, true);
read_pollcounters(r, "pollcounters", pollcounters);
}
if(r.has_member("hostmemory"))
host_memory = read_raw_file(r, "hostmemory");
savestate = read_raw_file(r, "savestate");