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Implement AreaStore serialization

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This commit is contained in:
ShadowNinja 2015-10-30 19:27:48 -04:00
parent c4b7afed7e
commit 821551a266
6 changed files with 104 additions and 95 deletions
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97
src/util/areastore.cpp
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@ -62,56 +62,41 @@ const Area *AreaStore::getArea(u32 id) const
return &it->second;
}
#if 0
Currently, serialisation is commented out. This is because of multiple reasons:
1. Why do we store the areastore into a file, why not into the database?
2. We don't use libspatial's serialisation, but we should, or perhaps not, because
it would remove the ability to switch. Perhaps write migration routines?
3. Various things need fixing, e.g. the size is serialized as
c++ implementation defined size_t
bool AreaStore::deserialize(std::istream &is)
{
u8 ver = readU8(is);
if (ver != 1)
return false;
u16 count_areas = readU16(is);
for (u16 i = 0; i < count_areas; i++) {
// deserialize an area
Area a;
a.id = readU32(is);
a.minedge = readV3S16(is);
a.maxedge = readV3S16(is);
a.datalen = readU16(is);
a.data = new char[a.datalen];
is.read((char *) a.data, a.datalen);
insertArea(a);
}
return true;
}
static bool serialize_area(void *ostr, Area *a)
{
std::ostream &os = *((std::ostream *) ostr);
writeU32(os, a->id);
writeV3S16(os, a->minedge);
writeV3S16(os, a->maxedge);
writeU16(os, a->datalen);
os.write(a->data, a->datalen);
return false;
}
void AreaStore::serialize(std::ostream &os) const
{
// write initial data
writeU8(os, 1); // serialisation version
writeU16(os, areas_map.size()); //DANGER: not platform independent
forEach(&serialize_area, &os);
writeU8(os, 0); // Serialisation version
// TODO: Compression?
writeU16(os, areas_map.size());
for (AreaMap::const_iterator it = areas_map.begin();
it != areas_map.end(); ++it) {
const Area &a = it->second;
writeV3S16(os, a.minedge);
writeV3S16(os, a.maxedge);
writeU16(os, a.data.size());
os.write(a.data.data(), a.data.size());
}
}
#endif
void AreaStore::deserialize(std::istream &is)
{
u8 ver = readU8(is);
if (ver != 0)
throw SerializationError("Unknown AreaStore "
"serialization version!");
u16 num_areas = readU16(is);
for (u32 i = 0; i < num_areas; ++i) {
Area a;
a.minedge = readV3S16(is);
a.maxedge = readV3S16(is);
u16 data_len = readU16(is);
char *data = new char[data_len];
is.read(data, data_len);
a.data = std::string(data, data_len);
insertArea(&a);
}
}
void AreaStore::invalidateCache()
{
@ -226,18 +211,6 @@ void VectorAreaStore::getAreasInArea(std::vector<Area *> *result,
}
}
#if 0
bool SimpleAreaStore::forEach(ForEachCallback callback, void *arg) const
{
for (size_t i = 0; i < m_areas.size(); ++i) {
if (callback(m_areas[i], arg)) {
return true;
}
}
return false;
}
#endif
#if USE_SPATIAL
static inline SpatialIndex::Region get_spatial_region(const v3s16 minedge,
@ -301,14 +274,6 @@ void SpatialAreaStore::getAreasInArea(std::vector<Area *> *result,
}
}
#if 0
bool SpatialAreaStore::forEach(ForEachCallback callback, void *arg) const
{
// TODO ?? (this is only needed for serialisation, but libspatial has its own serialisation)
return false;
}
#endif
SpatialAreaStore::~SpatialAreaStore()
{
delete m_tree;