--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/BooleanDataType.h Sat Jul 14 23:24:22 2018 +0200
@@ -0,0 +1,45 @@
+#pragma once
+
+#include <string>
+#include <iostream>
+
+#include "DataType.h"
+#include "RelpipeException.h"
+
+using namespace std;
+
+namespace rp_prototype {
+
+class BooleanDataType : public DataType<bool> {
+private:
+ const wstring TRUE = L"true";
+ const wstring FALSE = L"false";
+public:
+
+ BooleanDataType() : DataType<bool>(DATA_TYPE_ID_BOOLEAN, DATA_TYPE_CODE_BOOLEAN) {
+ }
+
+ bool readValue(istream &input) override {
+ auto value = input.get(); // TODO: check failbit
+ if (value == 0) return false;
+ else if (value == 1) return true;
+ else throw RelpipeException(L"Unable to convert the octet to boolean", EXIT_CODE_DATA_ERROR);
+ }
+
+ void writeValue(ostream &output, const bool &value) override {
+ output.put(value ? 1 : 0);
+ }
+
+ bool toValue(const wstring &stringValue) override {
+ if (stringValue == TRUE) return true;
+ else if (stringValue == FALSE) return false;
+ else throw RelpipeException(L"Unable to convert the string to boolean", EXIT_CODE_DATA_ERROR);
+ }
+
+ wstring toString(const bool &value) override {
+ return value ? TRUE : FALSE;
+ }
+
+};
+
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/DataTypeCatalog.h Sat Jul 14 23:24:22 2018 +0200
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <string>
+#include <iostream>
+#include <vector>
+
+#include "common.h"
+#include "DataType.h"
+#include "BooleanDataType.h"
+#include "IntegerDataType.h"
+#include "StringDataType.h"
+
+using namespace std;
+
+namespace rp_prototype {
+
+class DataTypeCatalog {
+private:
+ BooleanDataType booleanType;
+ IntegerDataType integerType;
+ StringDataType stringType;
+ vector<DataTypeBase*> types = {&booleanType, &integerType, &stringType};
+public:
+
+ integer_t toTypeId(const wstring typeCode) {
+ for (DataTypeBase* dataType : types) if (dataType->supports(typeCode)) return dataType->getTypeId();
+ throw RelpipeException(L"Unsupported data type: " + typeCode, EXIT_CODE_DATA_ERROR);
+ }
+
+ wstring toTypeCode(const integer_t typeId) {
+ for (DataTypeBase* dataType : types) if (dataType->supports(typeId)) return dataType->getTypeCode();
+ throw RelpipeException(L"Unsupported data type: " + typeId, EXIT_CODE_DATA_ERROR);
+ }
+
+ void writeString(ostream &output, const wstring &stringValue, const integer_t typeId) {
+ for (DataTypeBase* dataType : types) if (dataType->supports(typeId)) return dataType->writeString(output, stringValue);
+ throw RelpipeException(L"Unsupported data type: " + typeId, EXIT_CODE_DATA_ERROR);
+ }
+
+ wstring readString(istream &input, const integer_t typeId) {
+ for (DataTypeBase* dataType : types) if (dataType->supports(typeId)) return dataType->readString(input);
+ throw RelpipeException(L"Unsupported data type: " + typeId, EXIT_CODE_DATA_ERROR);
+ }
+
+};
+
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/IntegerDataType.h Sat Jul 14 23:24:22 2018 +0200
@@ -0,0 +1,131 @@
+#pragma once
+
+#include <string>
+#include <iostream>
+#include <cassert>
+#include <limits>
+
+#include "common.h"
+#include "DataType.h"
+#include "RelpipeException.h"
+
+using namespace std;
+
+namespace rp_prototype {
+
+/**
+ * The prototype does not have various integer and other numeric data types,
+ * it just works with one type of integer.
+ * But this integer has variable length -- smaller values occupy only one byte, bigger ones, more bytes 1,2,4,8 + first byte (contains length signalization).
+ * In the real implementation of relational pipes, there will be DataTypes for particular numeric types.
+ *
+ * TODO: support also big endian architectures.
+ * TODO: throw exception if a value was stored in bigger type than needed (while reading – there should be only one supported way how to encode a single value)
+ *
+ * Example of encoded values:
+ * -------------------------------------------------------------------------------------------------
+ * $ for n in 0 1 10 250 251 252 65535 65536 4294967295 4294967296 18446744073709551615; do printf '%20s = ' $n; dist/Debug/GNU-Linux/rp-prototype write integer $n | hd | head -n 1; done
+ * 0 = 00000000 00 |.|
+ * 1 = 00000000 01 |.|
+ * 10 = 00000000 0a |.|
+ * 250 = 00000000 fa |.|
+ * 251 = 00000000 fb fb |..|
+ * 252 = 00000000 fb fc |..|
+ * 65535 = 00000000 fc ff ff |...|
+ * 65536 = 00000000 fd 00 00 01 00 |.....|
+ * 4294967295 = 00000000 fd ff ff ff ff |.....|
+ * 4294967296 = 00000000 fe 00 00 00 00 01 00 00 00 |.........|
+ * 18446744073709551615 = 00000000 fe ff ff ff ff ff ff ff ff |.........|
+ * -------------------------------------------------------------------------------------------------
+ *
+ * Example of decoded values:
+ * -------------------------------------------------------------------------------------------------
+ * $ for n in 0 1 10 250 251 252 65535 65536 4294967295 4294967296 18446744073709551615; do dist/Debug/GNU-Linux/rp-prototype write integer $n | dist/Debug/GNU-Linux/rp-prototype read integer; done;
+ * 0
+ * 1
+ * 10
+ * 250
+ * 251
+ * 252
+ * 65535
+ * 65536
+ * 4294967295
+ * 4294967296
+ * 18446744073709551615
+ * -------------------------------------------------------------------------------------------------
+ *
+ * Note: similar format as original idea: https://en.wikipedia.org/wiki/X.690#Length_octets
+ *
+ */
+class IntegerDataType : public DataType<integer_t> {
+private:
+ static const uint8_t INTEGER_TYPE_UINT8 = 251;
+ static const uint8_t INTEGER_TYPE_UINT16 = 252;
+ static const uint8_t INTEGER_TYPE_UINT32 = 253;
+ static const uint8_t INTEGER_TYPE_UINT64 = 254;
+ static const uint8_t INTEGER_TYPE_RESERVED = 255;
+
+ template<typename T> integer_t read(istream &input) {
+ T value = 0;
+ input.read(reinterpret_cast<char *> (&value), sizeof (value));
+ return value;
+ }
+
+ template<typename T> void write(ostream &output, const integer_t &value) {
+ assert(sizeof (T) <= sizeof (value));
+ output.write(reinterpret_cast<const char *> (&value), sizeof (T));
+ }
+
+ template<typename T> void write(ostream &output, const uint8_t type, const integer_t &value) {
+ write<uint8_t>(output, type);
+ write<T>(output, value);
+ }
+
+ template<typename T> bool fits(const integer_t &value) {
+ return value <= numeric_limits<T>::max();
+ }
+
+public:
+
+ IntegerDataType() : DataType<integer_t>(DATA_TYPE_ID_INTEGER, DATA_TYPE_CODE_INTEGER) {
+ }
+
+ integer_t readValue(istream &input) override {
+ uint8_t first;
+ input.read(reinterpret_cast<char *> (&first), sizeof (first));
+ if (input.good()) {
+
+ if (first < INTEGER_TYPE_UINT8) return first;
+ else if (first == INTEGER_TYPE_UINT8) return read<uint8_t>(input);
+ else if (first == INTEGER_TYPE_UINT16) return read<uint16_t>(input);
+ else if (first == INTEGER_TYPE_UINT32) return read<uint32_t>(input);
+ else if (first == INTEGER_TYPE_UINT64) return read<uint64_t>(input);
+ else throw RelpipeException(L"Error while parsing integer type: unsupported type", EXIT_CODE_DATA_ERROR);
+ } else {
+ throw RelpipeException(L"Error while reading integer from the stream.", EXIT_CODE_DATA_ERROR);
+ }
+ }
+
+ void writeValue(ostream &output, const integer_t &value) override {
+ // output << value; // by zapsalo číslo jako ASII text
+
+ if (value < INTEGER_TYPE_UINT8) write<uint8_t>(output, value);
+ else if (fits<uint8_t>(value)) write<uint8_t>(output, INTEGER_TYPE_UINT8, value);
+ else if (fits<uint16_t>(value)) write<uint16_t>(output, INTEGER_TYPE_UINT16, value);
+ else if (fits<uint32_t>(value)) write<uint32_t>(output, INTEGER_TYPE_UINT32, value);
+ else if (fits<uint64_t>(value)) write<uint64_t>(output, INTEGER_TYPE_UINT64, value);
+ else throw RelpipeException(L"Error while writing integer type: value too long", EXIT_CODE_DATA_ERROR);
+ }
+
+ integer_t toValue(const wstring &stringValue) override {
+ // throws „terminate called after throwing an instance of 'std::invalid_argument'“ SIGABRT, core dumped on invalid number
+ return stoul(stringValue);
+ }
+
+ wstring toString(const integer_t &value) override {
+ return to_wstring(value);
+ }
+
+};
+
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/StringDataType.h Sat Jul 14 23:24:22 2018 +0200
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <string>
+#include <sstream>
+#include <iostream>
+#include <vector>
+#include <locale>
+#include <codecvt>
+
+#include "DataType.h"
+#include "RelpipeException.h"
+#include "IntegerDataType.h"
+
+using namespace std;
+
+namespace rp_prototype {
+
+/**
+ * The prototype does not recognize any encoding,
+ * it just works with c++ strings in encoding default to given platform.
+ * In the real implementation of relational pipes, there will be DataTypes for particular encodings.
+ */
+class StringDataType : public DataType<wstring> {
+private:
+ IntegerDataType integerType;
+ wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
+public:
+
+ StringDataType() : DataType<wstring>(DATA_TYPE_ID_STRING, DATA_TYPE_CODE_STRING) {
+ }
+
+ wstring readValue(istream &input) override {
+ integer_t length = integerType.readValue(input);
+ // TODO: check maximum length of single field
+ // if (length > 4000) throw RelpipeException("data too long", EXIT_CODE_DATA_ERROR);
+ vector<char> buf(length);
+ input.read(buf.data(), length);
+ if (input.good()) {
+ return convertor.from_bytes(string(buf.data(), length));
+ } else {
+ throw RelpipeException(L"Error while reading string from the stream.", EXIT_CODE_DATA_ERROR);
+ }
+ }
+
+ void writeValue(ostream &output, const wstring &value) override {
+ string s = convertor.to_bytes(value);
+ integerType.writeValue(output, s.length());
+ output << s.c_str();
+ }
+
+ wstring toValue(const wstring &stringValue) override {
+ return stringValue;
+ }
+
+ wstring toString(const wstring &value) override {
+ return value;
+ }
+
+};
+
+}
\ No newline at end of file