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/*=========================================================================
Program: GDCM (Grassroots DICOM). A DICOM library
Copyright (c) 2006-2011 Mathieu Malaterre
All rights reserved.
See Copyright.txt or http://gdcm.sourceforge.net/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include "gdcmSequenceOfFragments.h"
#include "gdcmImplicitDataElement.h"
#include "gdcmByteValue.h"
namespace gdcm
{
void SequenceOfFragments::Clear()
{
Table.SetByteValue( "", 0 );
Fragments.clear();
}
SequenceOfFragments::SizeType SequenceOfFragments::GetNumberOfFragments() const
{
// Do not count the last fragment
//assert( SequenceLengthField.IsUndefined() );
return Fragments.size();
}
void SequenceOfFragments::AddFragment(Fragment const &item)
{
Fragments.push_back(item);
}
VL SequenceOfFragments::ComputeLength() const
{
VL length = 0;
// First the table
length += Table.GetLength();
// Then all the fragments
FragmentVector::const_iterator it = Fragments.begin();
for(;it != Fragments.end(); ++it)
{
const VL fraglen = it->ComputeLength();
assert( fraglen % 2 == 0 );
length += fraglen;
}
assert( SequenceLengthField.IsUndefined() );
length += 8; // seq end delimitor (tag + vl)
return length;
}
unsigned long SequenceOfFragments::ComputeByteLength() const
{
unsigned long r = 0;
FragmentVector::const_iterator it = Fragments.begin();
for(;it != Fragments.end(); ++it)
{
assert( !it->GetVL().IsUndefined() );
r += it->GetVL();
}
return r;
}
bool SequenceOfFragments::GetFragBuffer(unsigned int fragNb, char *buffer, unsigned long &length) const
{
FragmentVector::const_iterator it = Fragments.begin();
{
const Fragment &frag = *(it+fragNb);
const ByteValue &bv = dynamic_cast<const ByteValue&>(frag.GetValue());
const VL len = frag.GetVL();
bv.GetBuffer(buffer, len);
length = len;
}
return true;
}
const Fragment& SequenceOfFragments::GetFragment(SizeType num) const
{
assert( num < Fragments.size() );
FragmentVector::const_iterator it = Fragments.begin();
const Fragment &frag = *(it+num);
return frag;
}
bool SequenceOfFragments::GetBuffer(char *buffer, unsigned long length) const
{
FragmentVector::const_iterator it = Fragments.begin();
unsigned long total = 0;
for(;it != Fragments.end(); ++it)
{
const Fragment &frag = *it;
const ByteValue &bv = dynamic_cast<const ByteValue&>(frag.GetValue());
const VL len = frag.GetVL();
bv.GetBuffer(buffer, len);
buffer += len;
total += len;
}
if( total != length )
{
//std::cerr << " DEBUG: " << total << " " << length << std::endl;
assert(0);
return false;
}
return true;
}
bool SequenceOfFragments::WriteBuffer(std::ostream &os) const
{
FragmentVector::const_iterator it = Fragments.begin();
unsigned long total = 0;
for(;it != Fragments.end(); ++it)
{
const Fragment &frag = *it;
const ByteValue *bv = frag.GetByteValue();
assert( bv );
const VL len = frag.GetVL();
bv->WriteBuffer(os);
total += len;
}
//if( total != length )
// {
// //std::cerr << " DEBUG: " << total << " " << length << std::endl;
// assert(0);
// return false;
// }
return true;
}
bool SequenceOfFragments::FillFragmentWithJPEG( Fragment & frag, std::istream & is )
{
std::vector<unsigned char> jfif;
unsigned char byte;
// begin /simple/ JPEG parser:
while( is.read( (char*)&byte, 1 ) )
{
jfif.push_back( byte );
if( byte == 0xd9 && jfif[ jfif.size() - 2 ] == 0xff ) break;
}
const uint32_t len = static_cast<uint32_t>(jfif.size());
frag.SetByteValue( (char*)&jfif[0], len );
return true;
}
} // end namespace gdcm
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