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/******************************************************************************
* Copyright (c) 2014, Hobu Inc. (hobu@hobu.co)
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Martin Isenburg or Iowa Department
* of Natural Resources nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
****************************************************************************/
#include "Header.hpp"
#include "Lasdump.hpp"
namespace pdal
{
namespace lasdump
{
const std::string Header::FILE_SIGNATURE("LASF");
#ifndef WIN32
const size_t Header::LEGACY_RETURN_COUNT;
const size_t Header::RETURN_COUNT;
#endif
Header::Header() : m_sourceId(0), m_globalEncoding(0), m_versionMinor(0),
m_createDOY(0), m_createYear(0), m_vlrOffset(0), m_pointOffset(0),
m_vlrCount(0), m_pointFormat(0), m_pointLen(0), m_pointCount(0),
m_isCompressed(false), m_eVlrOffset(0), m_eVlrCount(0)
{
m_pointCountByReturn.fill(0);
m_scales.fill(1.0);
m_offsets.fill(0.0);
}
uint16_t Header::basePointLen(uint8_t type)
{
switch (type)
{
case 0:
return 20;
case 1:
return 28;
case 2:
return 26;
case 3:
return 34;
case 6:
return 30;
case 7:
return 36;
case 8:
return 38;
}
return 0;
}
bool Header::valid() const
{
if (m_fileSig != FILE_SIGNATURE)
return false;
if (m_versionMinor > 10)
return false;
if (m_createDOY > 366)
return false;
if (m_createYear < 1970 || m_createYear > 2100)
return false;
return true;
}
namespace
{
void get(ILeStream& in, Uuid& uuid)
{
std::vector<char> buf(uuid.size());
in.get(buf.data(), uuid.size());
uuid.unpack(buf.data());
}
} // unnamed namespace;
ILeStream& operator>>(ILeStream& in, Header& h)
{
uint8_t versionMajor;
uint32_t legacyPointCount;
uint32_t legacyReturnCount;
in.get(h.m_fileSig, 4);
if (!h.signatureValid())
throw Exception("Not a LAS/LAZ file. Invalid file signature.");
in >> h.m_sourceId >> h.m_globalEncoding;
get(in, h.m_projectGuid);
in >> versionMajor >> h.m_versionMinor;
in.get(h.m_systemId, 32);
in.get(h.m_softwareId, 32);
in >> h.m_createDOY >> h.m_createYear >> h.m_vlrOffset >>
h.m_pointOffset >> h.m_vlrCount >> h.m_pointFormat >>
h.m_pointLen >> legacyPointCount;
h.m_pointCount = legacyPointCount;
// Although it isn't part of the LAS spec, the two high bits have been used
// to indicate compression, though only the high bit is currently used.
if (h.m_pointFormat & 0x80)
h.setCompressed(true);
h.m_pointFormat &= ~0xC0;
for (size_t i = 0; i < Header::LEGACY_RETURN_COUNT; ++i)
{
in >> legacyReturnCount;
h.m_pointCountByReturn[i] = legacyReturnCount;
}
in >> h.m_scales[0] >> h.m_scales[1] >> h.m_scales[2];
in >> h.m_offsets[0] >> h.m_offsets[1] >> h.m_offsets[2];
double maxX, minX;
double maxY, minY;
double maxZ, minZ;
in >> maxX >> minX >> maxY >> minY >> maxZ >> minZ;
h.m_bounds = BOX3D(minX, minY, minZ, maxX, maxY, maxZ);
if (h.versionAtLeast(1, 3))
{
uint64_t waveformOffset;
in >> waveformOffset;
}
if (h.versionAtLeast(1, 4))
{
uint32_t numPoints = (uint32_t)h.m_pointCount;
in >> h.m_eVlrOffset >> h.m_eVlrCount >> h.m_pointCount;
for (size_t i = 0; i < Header::RETURN_COUNT; ++i)
in >> h.m_pointCountByReturn[i];
if (numPoints && (numPoints != h.m_pointCount))
{
std::stringstream ss;
ss << "1.4 point count (" << h.m_pointCount << ") "
"doesn't match legacy point count (" << numPoints << ").";
throw Exception(ss.str());
}
}
return in;
}
std::ostream& operator<<(std::ostream& out, const Header& h)
{
out << "File version: " << "1." << (int)h.m_versionMinor << "\n";
out << "File signature: " << h.m_fileSig << "\n";
out << "File source ID: " << h.m_sourceId << "\n";
out << "Global encoding: " << h.m_globalEncoding << "\n";
out << "Project GUID: " << h.m_projectGuid << "\n";
out << "System ID: " << h.m_systemId << "\n";
out << "Software ID: " << h.m_softwareId << "\n";
out << "Creation DOY: " << h.m_createDOY << "\n";
out << "Creation Year: " << h.m_createYear << "\n";
out << "VLR offset (header size): " << h.m_vlrOffset << "\n";
out << "VLR Count: " << h.m_vlrCount << "\n";
out << "Point format: " << (int)h.m_pointFormat << "\n";
out << "Point offset: " << h.m_pointOffset << "\n";
out << "Point count: " << h.m_pointCount << "\n";
for (size_t i = 0; i < Header::RETURN_COUNT; ++i)
out << "Point count by return[" << i << "]: " <<
h.m_pointCountByReturn[i] << "\n";
out << "Scales X/Y/Z: " << h.m_scales[0] << "/" <<
h.m_scales[1] << "/" << h.m_scales[2] << "\n";
out << "Offsets X/Y/Z: " << h.m_offsets[0] << "/" <<
h.m_offsets[1] << "/" << h.m_offsets[2] << "\n";
out << "Max X/Y/Z: " << h.maxX() << "/" <<
h.maxY() << "/" << h.maxZ() << "\n";
out << "Min X/Y/Z: " << h.minX() << "/" <<
h.minY() << "/" << h.minZ() << "\n";
if (h.versionAtLeast(1, 4))
{
out << "Ext. VLR offset: " << h.m_eVlrOffset << "\n";
out << "Ext. VLR count: " << h.m_eVlrCount << "\n";
}
out << "Compressed: " << (h.m_isCompressed ? "true" : "false") << "\n";
return out;
}
} // namespace lasdump
} // namespace pdal
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