Method ipfsHash

libsolutil/IpfsHash.cpp:155–197

}

bytes solidity::util::ipfsHash(std::string _data)
{
	size_t const maxChunkSize = 1024 * 256;
	size_t chunkCount = _data.length() / maxChunkSize + (_data.length() % maxChunkSize > 0 ? 1 : 0);
	chunkCount = chunkCount == 0 ? 1 : chunkCount;

	Chunks allChunks;

	for (size_t chunkIndex = 0; chunkIndex < chunkCount; chunkIndex++)
	{
		bytes chunkBytes = asBytes(
			_data.substr(chunkIndex * maxChunkSize, std::min(maxChunkSize, _data.length() - chunkIndex * maxChunkSize))
		);

		bytes lengthAsVarint = varintEncoding(chunkBytes.size());

		bytes protobufEncodedData;
		// Type: File
		protobufEncodedData += bytes{0x08, 0x02};
		if (!chunkBytes.empty())
		{
			// Data (length delimited bytes)
			protobufEncodedData += bytes{0x12};
			protobufEncodedData += lengthAsVarint;
			protobufEncodedData += chunkBytes;
		}
		// filesize: length as varint
		protobufEncodedData += bytes{0x18} + lengthAsVarint;

		// PBDag:
		// Data: (length delimited bytes)
		bytes blockData = encodeByteArray(protobufEncodedData);

		// Multihash: sha2-256, 256 bits
		allChunks.emplace_back(
			encodeHash(blockData),
			chunkBytes.size(),
			blockData.size()
		);
	}

	return groupChunksBottomUp(std::move(allChunks));
}

std::string solidity::util::ipfsHashBase58(std::string _data)
{