Pipeline_private.hh
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#ifndef PIPELINE_PRIVATE_HH
#define PIPELINE_PRIVATE_HH
#include <qpdf/Pipeline.hh>
#include <qpdf/Pl_Flate.hh>
#include <qpdf/Types.h>
namespace qpdf::pl
{
struct Link
{
Link(std::unique_ptr<Link> next_link, std::unique_ptr<Pipeline> next_pl) :
next_link(std::move(next_link)),
next_pl(std::move(next_pl))
{
}
std::unique_ptr<Link> next_link{nullptr};
std::unique_ptr<Pipeline> next_pl{nullptr};
};
template <typename P, typename... Args>
std::unique_ptr<Link>
create(Args&&... args)
{
return std::make_unique<Link>(
nullptr, std::make_unique<P>("", nullptr, std::forward<Args>(args)...));
}
template <typename P, typename... Args>
std::unique_ptr<Link>
create(std::unique_ptr<Link> link, Args&&... args)
{
auto* next = link->next_pl.get();
return std::make_unique<Link>(
std::move(link), std::make_unique<P>("", next, std::forward<Args>(args)...));
}
class String final: public Pipeline
{
public:
String(char const* identifier, Pipeline*, std::string& str) :
Pipeline(identifier, nullptr),
str(str)
{
}
~String() final = default;
void
write(unsigned char const* buf, size_t len) final
{
if (len) {
str.append(reinterpret_cast<char const*>(buf), len);
}
}
void
finish() final
{
}
private:
std::string& str;
};
class Count final: public Pipeline
{
public:
// Count the number of characters written. If 'next' is not set, the content written will be
// discarded.
Count(unsigned long id, Pipeline* next = nullptr) :
Pipeline("", next),
id_(id),
pass_immediately_to_next(next)
{
}
// Count the number of characters written. If 'next' is not set, the content written will be
// discarded.
Count(unsigned long id, std::unique_ptr<Link> link) :
Pipeline("", link ? link->next_pl.get() : nullptr),
link(std::move(link)),
id_(id),
pass_immediately_to_next(link)
{
}
// Write to 'str'. If 'next' is set, 'str' will be written to 'next' when 'finish' is
// called.
Count(unsigned long id, std::string& str, std::unique_ptr<Link> link = nullptr) :
Pipeline("", link ? link->next_pl.get() : nullptr),
str(&str),
link(std::move(link)),
id_(id)
{
}
~Count() final = default;
void
write(unsigned char const* buf, size_t len) final
{
if (len) {
if (str) {
str->append(reinterpret_cast<char const*>(buf), len);
return;
}
count += static_cast<qpdf_offset_t>(len);
if (pass_immediately_to_next) {
next()->write(buf, len);
}
}
}
void
finish() final
{
if (next()) {
if (!pass_immediately_to_next) {
next()->write(reinterpret_cast<unsigned char const*>(str->data()), str->size());
}
next()->finish();
}
}
qpdf_offset_t
getCount() const
{
return str ? static_cast<qpdf_offset_t>(str->size()) : count;
}
unsigned long long
id() const
{
return id_;
}
private:
qpdf_offset_t count{0};
std::string* str{nullptr};
std::unique_ptr<Link> link{nullptr};
unsigned long id_{0};
bool pass_immediately_to_next{false};
};
} // namespace qpdf::pl
#endif // PIPELINE_PRIVATE_HH