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qpdf/libqpdf/Pl_MD5.cc
2013-03-04 16:45:16 -05:00

57 lines
1.1 KiB
C++

#include <qpdf/Pl_MD5.hh>
#include <stdexcept>
Pl_MD5::Pl_MD5(char const* identifier, Pipeline* next) :
Pipeline(identifier, next),
in_progress(false)
{
}
Pl_MD5::~Pl_MD5()
{
}
void
Pl_MD5::write(unsigned char* buf, size_t len)
{
if (! this->in_progress)
{
this->md5.reset();
this->in_progress = true;
}
// Write in chunks in case len is too big to fit in an int.
// Assume int is at least 32 bits.
static size_t const max_bytes = 1 << 30;
size_t bytes_left = len;
unsigned char* data = buf;
while (bytes_left > 0)
{
size_t bytes = (bytes_left >= max_bytes ? max_bytes : bytes_left);
this->md5.encodeDataIncrementally(
reinterpret_cast<char*>(data), bytes);
bytes_left -= bytes;
data += bytes;
}
this->getNext()->write(buf, len);
}
void
Pl_MD5::finish()
{
this->getNext()->finish();
this->in_progress = false;
}
std::string
Pl_MD5::getHexDigest()
{
if (this->in_progress)
{
throw std::logic_error(
"digest requested for in-progress MD5 Pipeline");
}
return this->md5.unparse();
}