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bson.h
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Sun, Aug 18, 18:18

bson.h
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//===========================================================================
#ifndef BSON_H_
#define BSON_H_
//===========================================================================
#ifdef __arm__
#define USE_MISALIGNED_MEMORY_ACCESS 0
#else
#define USE_MISALIGNED_MEMORY_ACCESS 1
#endif
#include <node.h>
#include <node_object_wrap.h>
#include <v8.h>
using namespace v8;
using namespace node;
//===========================================================================
enum BsonType
{
BSON_TYPE_NUMBER = 1,
BSON_TYPE_STRING = 2,
BSON_TYPE_OBJECT = 3,
BSON_TYPE_ARRAY = 4,
BSON_TYPE_BINARY = 5,
BSON_TYPE_UNDEFINED = 6,
BSON_TYPE_OID = 7,
BSON_TYPE_BOOLEAN = 8,
BSON_TYPE_DATE = 9,
BSON_TYPE_NULL = 10,
BSON_TYPE_REGEXP = 11,
BSON_TYPE_CODE = 13,
BSON_TYPE_SYMBOL = 14,
BSON_TYPE_CODE_W_SCOPE = 15,
BSON_TYPE_INT = 16,
BSON_TYPE_TIMESTAMP = 17,
BSON_TYPE_LONG = 18,
BSON_TYPE_MAX_KEY = 0x7f,
BSON_TYPE_MIN_KEY = 0xff
};
//===========================================================================
template<typename T> class BSONSerializer;
class BSON : public ObjectWrap {
public:
BSON();
~BSON() {}
static void Initialize(Handle<Object> target);
static Handle<Value> BSONDeserializeStream(const Arguments &args);
// JS based objects
static Handle<Value> BSONSerialize(const Arguments &args);
static Handle<Value> BSONDeserialize(const Arguments &args);
// Calculate size of function
static Handle<Value> CalculateObjectSize(const Arguments &args);
static Handle<Value> SerializeWithBufferAndIndex(const Arguments &args);
// Constructor used for creating new BSON objects from C++
static Persistent<FunctionTemplate> constructor_template;
private:
static Handle<Value> New(const Arguments &args);
static Handle<Value> deserialize(BSON *bson, char *data, uint32_t dataLength, uint32_t startIndex, bool is_array_item);
// BSON type instantiate functions
Persistent<Function> longConstructor;
Persistent<Function> objectIDConstructor;
Persistent<Function> binaryConstructor;
Persistent<Function> codeConstructor;
Persistent<Function> dbrefConstructor;
Persistent<Function> symbolConstructor;
Persistent<Function> doubleConstructor;
Persistent<Function> timestampConstructor;
Persistent<Function> minKeyConstructor;
Persistent<Function> maxKeyConstructor;
// Equality Objects
Persistent<String> longString;
Persistent<String> objectIDString;
Persistent<String> binaryString;
Persistent<String> codeString;
Persistent<String> dbrefString;
Persistent<String> symbolString;
Persistent<String> doubleString;
Persistent<String> timestampString;
Persistent<String> minKeyString;
Persistent<String> maxKeyString;
// Equality speed up comparison objects
Persistent<String> _bsontypeString;
Persistent<String> _longLowString;
Persistent<String> _longHighString;
Persistent<String> _objectIDidString;
Persistent<String> _binaryPositionString;
Persistent<String> _binarySubTypeString;
Persistent<String> _binaryBufferString;
Persistent<String> _doubleValueString;
Persistent<String> _symbolValueString;
Persistent<String> _dbRefRefString;
Persistent<String> _dbRefIdRefString;
Persistent<String> _dbRefDbRefString;
Persistent<String> _dbRefNamespaceString;
Persistent<String> _dbRefDbString;
Persistent<String> _dbRefOidString;
Persistent<String> _codeCodeString;
Persistent<String> _codeScopeString;
Persistent<String> _toBSONString;
Local<Object> GetSerializeObject(const Handle<Value>& object);
template<typename T> friend class BSONSerializer;
friend class BSONDeserializer;
};
//===========================================================================
class CountStream
{
public:
CountStream() : count(0) { }
void WriteByte(int value) { ++count; }
void WriteByte(const Handle<Object>&, const Handle<String>&) { ++count; }
void WriteBool(const Handle<Value>& value) { ++count; }
void WriteInt32(int32_t value) { count += 4; }
void WriteInt32(const Handle<Value>& value) { count += 4; }
void WriteInt32(const Handle<Object>& object, const Handle<String>& key) { count += 4; }
void WriteInt64(int64_t value) { count += 8; }
void WriteInt64(const Handle<Value>& value) { count += 8; }
void WriteDouble(double value) { count += 8; }
void WriteDouble(const Handle<Value>& value) { count += 8; }
void WriteDouble(const Handle<Object>&, const Handle<String>&) { count += 8; }
void WriteUInt32String(uint32_t name) { char buffer[32]; count += sprintf(buffer, "%u", name) + 1; }
void WriteLengthPrefixedString(const Local<String>& value) { count += value->Utf8Length()+5; }
void WriteObjectId(const Handle<Object>& object, const Handle<String>& key) { count += 12; }
void WriteString(const Local<String>& value) { count += value->Utf8Length() + 1; } // This returns the number of bytes exclusive of the NULL terminator
void WriteData(const char* data, size_t length) { count += length; }
void* BeginWriteType() { ++count; return NULL; }
void CommitType(void*, BsonType) { }
void* BeginWriteSize() { count += 4; return NULL; }
void CommitSize(void*) { }
size_t GetSerializeSize() const { return count; }
// Do nothing. CheckKey is implemented for DataStream
void CheckKey(const Local<String>&) { }
private:
size_t count;
};
class DataStream
{
public:
DataStream(char* aDestinationBuffer) : destinationBuffer(aDestinationBuffer), p(aDestinationBuffer) { }
void WriteByte(int value) { *p++ = value; }
void WriteByte(const Handle<Object>& object, const Handle<String>& key) { *p++ = object->Get(key)->Int32Value(); }
#if USE_MISALIGNED_MEMORY_ACCESS
void WriteInt32(int32_t value) { *reinterpret_cast<int32_t*>(p) = value; p += 4; }
void WriteInt64(int64_t value) { *reinterpret_cast<int64_t*>(p) = value; p += 8; }
void WriteDouble(double value) { *reinterpret_cast<double*>(p) = value; p += 8; }
#else
void WriteInt32(int32_t value) { memcpy(p, &value, 4); p += 4; }
void WriteInt64(int64_t value) { memcpy(p, &value, 8); p += 8; }
void WriteDouble(double value) { memcpy(p, &value, 8); p += 8; }
#endif
void WriteBool(const Handle<Value>& value) { WriteByte(value->BooleanValue() ? 1 : 0); }
void WriteInt32(const Handle<Value>& value) { WriteInt32(value->Int32Value()); }
void WriteInt32(const Handle<Object>& object, const Handle<String>& key) { WriteInt32(object->Get(key)); }
void WriteInt64(const Handle<Value>& value) { WriteInt64(value->IntegerValue()); }
void WriteDouble(const Handle<Value>& value) { WriteDouble(value->NumberValue()); }
void WriteDouble(const Handle<Object>& object, const Handle<String>& key) { WriteDouble(object->Get(key)); }
void WriteUInt32String(uint32_t name) { p += sprintf(p, "%u", name) + 1; }
void WriteLengthPrefixedString(const Local<String>& value) { WriteInt32(value->Utf8Length()+1); WriteString(value); }
void WriteObjectId(const Handle<Object>& object, const Handle<String>& key);
void WriteString(const Local<String>& value) { p += value->WriteUtf8(p); } // This returns the number of bytes inclusive of the NULL terminator.
void WriteData(const char* data, size_t length) { memcpy(p, data, length); p += length; }
void* BeginWriteType() { void* returnValue = p; p++; return returnValue; }
void CommitType(void* beginPoint, BsonType value) { *reinterpret_cast<unsigned char*>(beginPoint) = value; }
void* BeginWriteSize() { void* returnValue = p; p += 4; return returnValue; }
#if USE_MISALIGNED_MEMORY_ACCESS
void CommitSize(void* beginPoint) { *reinterpret_cast<int32_t*>(beginPoint) = (int32_t) (p - (char*) beginPoint); }
#else
void CommitSize(void* beginPoint) { int32_t value = (int32_t) (p - (char*) beginPoint); memcpy(beginPoint, &value, 4); }
#endif
size_t GetSerializeSize() const { return p - destinationBuffer; }
void CheckKey(const Local<String>& keyName);
protected:
char *const destinationBuffer; // base, never changes
char* p; // cursor into buffer
};
template<typename T> class BSONSerializer : public T
{
private:
typedef T Inherited;
public:
BSONSerializer(BSON* aBson, bool aCheckKeys, bool aSerializeFunctions) : Inherited(), checkKeys(aCheckKeys), serializeFunctions(aSerializeFunctions), bson(aBson) { }
BSONSerializer(BSON* aBson, bool aCheckKeys, bool aSerializeFunctions, char* parentParam) : Inherited(parentParam), checkKeys(aCheckKeys), serializeFunctions(aSerializeFunctions), bson(aBson) { }
void SerializeDocument(const Handle<Value>& value);
void SerializeArray(const Handle<Value>& value);
void SerializeValue(void* typeLocation, const Handle<Value>& value);
private:
bool checkKeys;
bool serializeFunctions;
BSON* bson;
};
//===========================================================================
class BSONDeserializer
{
public:
BSONDeserializer(BSON* aBson, char* data, size_t length);
BSONDeserializer(BSONDeserializer& parentSerializer, size_t length);
Handle<Value> DeserializeDocument(bool promoteLongs);
bool HasMoreData() const { return p < pEnd; }
Local<String> ReadCString();
uint32_t ReadIntegerString();
int32_t ReadRegexOptions();
Local<String> ReadString();
Local<String> ReadObjectId();
unsigned char ReadByte() { return *reinterpret_cast<unsigned char*>(p++); }
#if USE_MISALIGNED_MEMORY_ACCESS
int32_t ReadInt32() { int32_t returnValue = *reinterpret_cast<int32_t*>(p); p += 4; return returnValue; }
uint32_t ReadUInt32() { uint32_t returnValue = *reinterpret_cast<uint32_t*>(p); p += 4; return returnValue; }
int64_t ReadInt64() { int64_t returnValue = *reinterpret_cast<int64_t*>(p); p += 8; return returnValue; }
double ReadDouble() { double returnValue = *reinterpret_cast<double*>(p); p += 8; return returnValue; }
#else
int32_t ReadInt32() { int32_t returnValue; memcpy(&returnValue, p, 4); p += 4; return returnValue; }
uint32_t ReadUInt32() { uint32_t returnValue; memcpy(&returnValue, p, 4); p += 4; return returnValue; }
int64_t ReadInt64() { int64_t returnValue; memcpy(&returnValue, p, 8); p += 8; return returnValue; }
double ReadDouble() { double returnValue; memcpy(&returnValue, p, 8); p += 8; return returnValue; }
#endif
size_t GetSerializeSize() const { return p - pStart; }
private:
Handle<Value> DeserializeArray(bool promoteLongs);
Handle<Value> DeserializeValue(BsonType type, bool promoteLongs);
Handle<Value> DeserializeDocumentInternal(bool promoteLongs);
Handle<Value> DeserializeArrayInternal(bool promoteLongs);
BSON* bson;
char* const pStart;
char* p;
char* const pEnd;
};
//===========================================================================
#endif // BSON_H_
//===========================================================================

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