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#include <qpdf/Pl_Buffer.hh>
#include <stdexcept>
#include <algorithm>
#include <assert.h>
#include <string.h>
Pl_Buffer::Pl_Buffer(char const* identifier, Pipeline* next) :
Pipeline(identifier, next),
ready(true),
total_size(0)
{
}
Pl_Buffer::~Pl_Buffer()
{
}
void
Pl_Buffer::write(unsigned char* buf, size_t len)
{
PointerHolder<Buffer> cur_buf;
size_t cur_size = 0;
if (! this->data.empty())
{
cur_buf = this->data.back();
cur_size = cur_buf->getSize();
}
size_t left = cur_size - this->total_size;
if (left < len)
{
size_t new_size = std::max(this->total_size + len, 2 * cur_size);
Buffer* b = new Buffer(new_size);
if (cur_buf.getPointer())
{
memcpy(b->getBuffer(), cur_buf->getBuffer(), this->total_size);
}
this->data.clear();
cur_buf = b;
this->data.push_back(cur_buf);
}
if (len)
{
memcpy(cur_buf->getBuffer() + this->total_size, buf, len);
this->total_size += len;
}
this->ready = false;
if (getNext(true))
{
getNext()->write(buf, len);
}
}
void
Pl_Buffer::finish()
{
this->ready = true;
if (getNext(true))
{
getNext()->finish();
}
}
Buffer*
Pl_Buffer::getBuffer()
{
if (! this->ready)
{
throw std::logic_error("Pl_Buffer::getBuffer() called when not ready");
}
Buffer* b = new Buffer(this->total_size);
unsigned char* p = b->getBuffer();
if (! this->data.empty())
{
PointerHolder<Buffer> bp = this->data.back();
this->data.clear();
memcpy(p, bp->getBuffer(), this->total_size);
}
this->total_size = 0;
this->ready = false;
return b;
}
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