Pl_MD5.cc
1.39 KB
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#include <qpdf/Pl_MD5.hh>
#include <stdexcept>
Pl_MD5::Pl_MD5(char const* identifier, Pipeline* next) :
Pipeline(identifier, next)
{
if (!next) {
throw std::logic_error("Attempt to create Pl_MD5 with nullptr as next");
}
}
void
Pl_MD5::write(unsigned char const* buf, size_t len)
{
if (enabled) {
if (!in_progress) {
md5.reset();
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 const* data = buf;
while (bytes_left > 0) {
size_t bytes = (bytes_left >= max_bytes ? max_bytes : bytes_left);
md5.encodeDataIncrementally(reinterpret_cast<char const*>(data), bytes);
bytes_left -= bytes;
data += bytes;
}
}
next()->write(buf, len);
}
void
Pl_MD5::finish()
{
next()->finish();
if (!persist_across_finish) {
in_progress = false;
}
}
void
Pl_MD5::enable(bool is_enabled)
{
enabled = is_enabled;
}
void
Pl_MD5::persistAcrossFinish(bool persist)
{
persist_across_finish = persist;
}
std::string
Pl_MD5::getHexDigest()
{
if (!enabled) {
throw std::logic_error("digest requested for a disabled MD5 Pipeline");
}
in_progress = false;
return md5.unparse();
}