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CafeIO.sol
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CafeIO.sol
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pragma solidity ^0.4.24;
import "./CDF.sol";
contract CafeIO {
struct Cafe {
string name;
uint32 latitude;
uint32 longitude;
address owner;
}
function write(string name, uint32 latitude, uint32 longitude, address owner) public returns (uint id) {
// init
uint32 nextId;
uint16[] memory currentChunkLengths;
(nextId, currentChunkLengths) = CDF.unpackWriterState(writerState);
uint thisId = nextId++;
uint fieldNumber = 0;
uint chunkNumber;
uint itemNumberInChunk;
uint chunkDataPosition;
// TODO code generation
// name
chunkNumber = CDF.chunkNumber(thisId, name_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(thisId, name_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("name", chunkNumber);
if (0 == itemNumberInChunk) {
// starting new chunk
currentChunkLengths[fieldNumber] = uint16(0);
}
uint16 currentChunkLength = currentChunkLengths[fieldNumber];
bytes memory packed = CDF.writeString(name);
CDF.writeChunkBytes(chunkDataPosition, currentChunkLength, packed);
require(packed.length < 0xFFFF && currentChunkLength + uint16(packed.length) > currentChunkLength);
currentChunkLengths[fieldNumber] = currentChunkLength + uint16(packed.length);
fieldNumber++;
// latitude
chunkNumber = CDF.chunkNumber(thisId, latitude_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(thisId, latitude_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("latitude", chunkNumber);
if (0 == itemNumberInChunk) {
// starting new chunk
currentChunkLengths[fieldNumber] = uint16(0);
}
currentChunkLength = currentChunkLengths[fieldNumber];
packed = CDF.writeUint32(latitude);
CDF.writeChunkBytes(chunkDataPosition, currentChunkLength, packed);
require(packed.length < 0xFFFF && currentChunkLength + uint16(packed.length) > currentChunkLength);
currentChunkLengths[fieldNumber] = currentChunkLength + uint16(packed.length);
fieldNumber++;
// longitude
chunkNumber = CDF.chunkNumber(thisId, longitude_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(thisId, longitude_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("longitude", chunkNumber);
if (0 == itemNumberInChunk) {
// starting new chunk
currentChunkLengths[fieldNumber] = uint16(0);
}
currentChunkLength = currentChunkLengths[fieldNumber];
packed = CDF.writeUint32(longitude);
CDF.writeChunkBytes(chunkDataPosition, currentChunkLength, packed);
require(packed.length < 0xFFFF && currentChunkLength + uint16(packed.length) > currentChunkLength);
currentChunkLengths[fieldNumber] = currentChunkLength + uint16(packed.length);
fieldNumber++;
// owner
chunkNumber = CDF.chunkNumber(thisId, owner_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(thisId, owner_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("owner", chunkNumber);
if (0 == itemNumberInChunk) {
// starting new chunk
currentChunkLengths[fieldNumber] = uint16(0);
}
currentChunkLength = currentChunkLengths[fieldNumber];
packed = CDF.writeAddress(owner);
CDF.writeChunkBytes(chunkDataPosition, currentChunkLength, packed);
require(packed.length < 0xFFFF && currentChunkLength + uint16(packed.length) > currentChunkLength);
currentChunkLengths[fieldNumber] = currentChunkLength + uint16(packed.length);
fieldNumber++;
// finalization
writerState = CDF.packWriterState(nextId, currentChunkLengths);
return thisId;
}
function read(uint id) public view returns (string name, uint32 latitude, uint32 longitude, address owner) {
// init
uint chunkNumber;
uint itemNumberInChunk;
uint chunkDataPosition;
uint i;
uint chunkDataOffset;
// TODO code generation
// name
chunkNumber = CDF.chunkNumber(id, name_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(id, name_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("name", chunkNumber);
chunkDataOffset = 0;
for (i = 0; i <= itemNumberInChunk; i++) {
(name, chunkDataOffset) = CDF.readString(chunkDataPosition, chunkDataOffset);
}
// latitude
chunkNumber = CDF.chunkNumber(id, latitude_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(id, latitude_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("latitude", chunkNumber);
chunkDataOffset = 0;
for (i = 0; i <= itemNumberInChunk; i++) {
(latitude, chunkDataOffset) = CDF.readUint32(chunkDataPosition, chunkDataOffset);
}
// longitude
chunkNumber = CDF.chunkNumber(id, longitude_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(id, longitude_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("longitude", chunkNumber);
chunkDataOffset = 0;
for (i = 0; i <= itemNumberInChunk; i++) {
(longitude, chunkDataOffset) = CDF.readUint32(chunkDataPosition, chunkDataOffset);
}
// owner
chunkNumber = CDF.chunkNumber(id, owner_meta.itemsPerChunkInBits);
itemNumberInChunk = CDF.itemNumberInChunk(id, owner_meta.itemsPerChunkInBits);
chunkDataPosition = CDF.chunkDataPosition("owner", chunkNumber);
chunkDataOffset = 0;
for (i = 0; i <= itemNumberInChunk; i++) {
(owner, chunkDataOffset) = CDF.readAddress(chunkDataPosition, chunkDataOffset);
}
}
CDF.ColumnMeta name_meta = CDF.ColumnMeta({itemsPerChunkInBits: 5});
CDF.ColumnMeta latitude_meta = CDF.ColumnMeta({itemsPerChunkInBits: 7});
CDF.ColumnMeta longitude_meta = CDF.ColumnMeta({itemsPerChunkInBits: 7});
CDF.ColumnMeta owner_meta = CDF.ColumnMeta({itemsPerChunkInBits: 5});
uint private writerState;
}