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/*
* (C) Copyright 1996-2012 ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
* In applying this licence, ECMWF does not waive the privileges and immunities
* granted to it by virtue of its status as an intergovernmental organisation nor
* does it submit to any jurisdiction.
*/
#include <ctime>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include "eckit/testing/Test.h"
#include "eckit/system/SystemInfo.h"
#include "eckit/eckit_ecbuild_config.h"
#include "odc/api/ColumnType.h"
#include "odc/core/Codec.h"
#include "odc/codec/String.h"
using namespace eckit::testing;
using namespace odc::core;
using namespace odc::codec;
// ------------------------------------------------------------------------------------------------------
// TODO with codecs:
//
// i) Make them templated on the stream/datahandle directly
// ii) Construct them with a specific data handle/stream
// iii) Why are we casting data handles via a void* ???
// Given the codec-initialising data, add the header on that is used to construct the
// codec.
size_t prepend_codec_selection_header(std::vector<unsigned char>& data,
const std::string& codec_name,
bool bigEndian=false) {
data.insert(data.begin(), 4, 0);
data[bigEndian ? 3 : 0] = static_cast<unsigned char>(codec_name.size());
data.insert(data.begin() + 4, codec_name.begin(), codec_name.end());
return 4 + codec_name.length();
}
CASE("Character strings can be stored in a flat list, and indexed") {
// n.b. no missing values
const char* source_data[] = {
// Codec header
"\x00\x00\x00\x00", // 0 = hasMissing
"\x00\x00\x00\x00\x00\x00\x00\x00", // min unspecified
"\x00\x00\x00\x00\x00\x00\x00\x00", // max unspecified
"\x00\x00\x00\x00\x00\x00\x00\x00", // missingValue unspecified
// How many strings are there in the table?
"\x06\x00\x00\x00",
// String data (prepended with lengths)
// length, data, "cnt (discarded)", index
"\x08\x00\x00\x00", "ghijklmn", "\x00\x00\x00\x00", "\x00\x00\x00\x00",
"\x0c\x00\x00\x00", "uvwxyzabcdef", "\x00\x00\x00\x00", "\x01\x00\x00\x00", // too long
"\x08\x00\x00\x00", "opqrstuv", "\x00\x00\x00\x00", "\x02\x00\x00\x00",
"\x02\x00\x00\x00", "ab", "\x00\x00\x00\x00", "\x03\x00\x00\x00", // This string is too short
"\x06\x00\x00\x00", "ghijkl", "\x00\x00\x00\x00", "\x04\x00\x00\x00",
"\x08\x00\x00\x00", "mnopqrst", "\x00\x00\x00\x00", "\x05\x00\x00\x00", // 8-byte length
};
// Loop throumgh endiannesses for the source data
for (int i = 0; i < 4; i++) {
bool bigEndianSource = (i % 2 == 0);
bool bits16 = (i > 1);
std::vector<unsigned char> data;
for (size_t j = 0; j < sizeof(source_data) / sizeof(const char*); j++) {
size_t len =
(j < 5) ? ((j == 0 || j == 4) ? 4 : 8)
: ((j+2) % 4 == 0 ? ::strlen(source_data[j]) : 4);
data.insert(data.end(), source_data[j], source_data[j] + len);
// n.b. Don't reverse the endianness of the string data.
if (bigEndianSource && !((j > 5) && ((j+2) % 4 == 0)))
std::reverse(data.end()-len, data.end());
}
// Which strings do we wish to decode (look at them in reverse. nb refers to index column)
for (int n = 5; n >= 0; n--) {
if (bits16 && bigEndianSource)
data.push_back(0);
data.push_back(static_cast<unsigned char>(n));
if (bits16 && !bigEndianSource)
data.push_back(0);
}
// Construct codec directly, and decode the header
// Skip name of codec
GeneralDataStream ds(bigEndianSource != eckit::system::SystemInfo::isBigEndian(), &data[0], data.size());
std::unique_ptr<Codec> c;
if (bigEndianSource == eckit::system::SystemInfo::isBigEndian()) {
if (bits16) {
c.reset(new CodecInt16String<SameByteOrder>(odc::api::STRING));
} else {
c.reset(new CodecInt8String<SameByteOrder>(odc::api::STRING));
}
} else {
if (bits16) {
c.reset(new CodecInt16String<OtherByteOrder>(odc::api::STRING));
} else {
c.reset(new CodecInt8String<OtherByteOrder>(odc::api::STRING));
}
}
c->load(ds);
EXPECT(ds.position() == eckit::Offset(148));
// Now re-encode the codec header, and check that we get what we started with!
eckit::Buffer writeBuffer(4096);
::memset(writeBuffer, 0, writeBuffer.size());
GeneralDataStream ds2(bigEndianSource != eckit::system::SystemInfo::isBigEndian(), writeBuffer);
c->save(ds2);
// Check that the data is the same both times!
EXPECT(ds2.position() == eckit::Offset(148));
// eckit::Log::info() << "DATA: " << std::endl;
// for (size_t n = 0; n < data.size(); n++) {
// eckit::Log::info() << std::hex << int(data[n]) << " " << int(dh_write.getBuffer()[n]) << std::endl;
// if (int(data[n]) != int(dh_write.getBuffer()[n]))
// eckit::Log::info() << "******************************" << std::endl;
// }
// The header should be correctly re-encoded.
EXPECT(::memcmp(writeBuffer, &data[0], 148) == 0);
// We haven't encoded the data itself
for (size_t i = 148; i < 154; i++) {
EXPECT(writeBuffer[i] == 0);
}
}
}
// ------------------------------------------------------------------------------------------------------
int main(int argc, char* argv[]) {
return run_tests(argc, argv);
}
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