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move dgo decompression to common utils and support it in the dgo unpacker (#312)

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This commit is contained in:
water111
2021-03-06 16:06:08 -05:00
committed by GitHub
parent f123bf368a
commit 26da66b29c
6 changed files with 82 additions and 48 deletions
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decompiler/ObjectFile/ObjectFileDB.cpp
+2 -46
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@@ -195,52 +195,8 @@ void ObjectFileDB::get_objs_from_dgo(const std::string& filename) {
auto dgo_data = file_util::read_binary_file(filename);
stats.total_dgo_bytes += dgo_data.size();
const char jak2_header[] = "oZlB";
bool is_jak2 = true;
for (int i = 0; i < 4; i++) {
if (jak2_header[i] != dgo_data[i]) {
is_jak2 = false;
}
}
if (is_jak2) {
BinaryReader compressed_reader(dgo_data);
// seek past oZlB
compressed_reader.ffwd(4);
std::size_t decompressed_size = compressed_reader.read<uint32_t>();
std::vector<uint8_t> decompressed_data;
decompressed_data.resize(decompressed_size);
size_t output_offset = 0;
while (true) {
// seek past alignment bytes and read the next chunk size
uint32_t chunk_size = 0;
while (!chunk_size) {
chunk_size = compressed_reader.read<uint32_t>();
}
if (chunk_size < MAX_CHUNK_SIZE) {
std::size_t bytes_written = 0;
lzokay::EResult ok = lzokay::decompress(
compressed_reader.here(), chunk_size, decompressed_data.data() + output_offset,
decompressed_data.size() - output_offset, bytes_written);
assert(ok == lzokay::EResult::Success);
compressed_reader.ffwd(chunk_size);
output_offset += bytes_written;
} else {
// nope - sometimes chunk_size is bigger than MAX, but we should still use max.
// assert(chunk_size == MAX_CHUNK_SIZE);
memcpy(decompressed_data.data() + output_offset, compressed_reader.here(), MAX_CHUNK_SIZE);
compressed_reader.ffwd(MAX_CHUNK_SIZE);
output_offset += MAX_CHUNK_SIZE;
}
if (output_offset >= decompressed_size)
break;
while (compressed_reader.get_seek() % 4) {
compressed_reader.ffwd(1);
}
}
dgo_data = decompressed_data;
if (file_util::dgo_header_is_compressed(dgo_data)) {
dgo_data = file_util::decompress_dgo(dgo_data);
}
BinaryReader reader(dgo_data);