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#pragma once
#include <util/generic/vector.h>
#include <util/memory/blob.h>
#define BLOBMETASIG 0x3456789Au
enum E_Multiblob_Flags {
// if EMF_INTERLAY is clear
// multiblob format
// HeaderSize() bytes for TMultiBlobHeader
// Count*sizeof(ui64) bytes for blob sizes
// blob1
// (alignment)
// blob2
// (alignment)
// ...
// (alignment)
// blobn
// if EMF_INTERLAY is set
// multiblob format
// HeaderSize() bytes for TMultiBlobHeader
// size1 ui64, the size of 1st blob
// blob1
// (alignment)
// size2 ui64, the size of 2nd blob
// blob2
// (alignment)
// ...
// (alignment)
// sizen ui64, the size of n'th blob
// blobn
EMF_INTERLAY = 1,
// Means that multiblob contains blocks in TChunkedDataReader format
// Legacy, use it only for old files, created for TChunkedDataReader
EMF_CHUNKED_DATA_READER = 2,
// Flags that may be configured for blobbuilder in client code
EMF_WRITEABLE = EMF_INTERLAY,
};
struct TMultiBlobHeader {
// data
ui32 BlobMetaSig;
ui32 BlobRecordSig;
ui64 Count; // count of sub blobs
ui32 Align; // alignment for every subblob
ui32 Flags;
static const ui32 RecordSig = 0x23456789;
static inline size_t HeaderSize() {
return 4 * sizeof(ui64);
}
inline const ui64* Sizes(const void* Data) const {
return (const ui64*)((const char*)Data + HeaderSize());
}
};
class TSubBlobs: public TVector<TBlob> {
public:
TSubBlobs() {
}
TSubBlobs(const TBlob& multi) {
ReadMultiBlob(multi);
}
void ReadMultiBlob(const TBlob& multi);
const TMultiBlobHeader* GetHeader() const {
return (const TMultiBlobHeader*)&Header;
}
protected:
TMultiBlobHeader Header;
TBlob Multi;
private:
bool ReadChunkedData(const TBlob& multi) noexcept;
};
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