mirror of https://github.com/qpdf/qpdf.git
67 lines
1.4 KiB
C++
67 lines
1.4 KiB
C++
#include <qpdf/Pl_MD5.hh>
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#include <stdexcept>
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Pl_MD5::Pl_MD5(char const* identifier, Pipeline* next) :
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Pipeline(identifier, next),
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in_progress(false),
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enabled(true),
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persist_across_finish(false)
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{
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}
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void
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Pl_MD5::write(unsigned char const* buf, size_t len)
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{
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if (this->enabled) {
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if (!this->in_progress) {
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this->md5.reset();
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this->in_progress = true;
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}
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// Write in chunks in case len is too big to fit in an int. Assume int is at least 32 bits.
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static size_t const max_bytes = 1 << 30;
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size_t bytes_left = len;
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unsigned char const* data = buf;
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while (bytes_left > 0) {
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size_t bytes = (bytes_left >= max_bytes ? max_bytes : bytes_left);
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this->md5.encodeDataIncrementally(reinterpret_cast<char const*>(data), bytes);
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bytes_left -= bytes;
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data += bytes;
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}
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}
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this->getNext()->write(buf, len);
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}
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void
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Pl_MD5::finish()
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{
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this->getNext()->finish();
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if (!this->persist_across_finish) {
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this->in_progress = false;
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}
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}
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void
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Pl_MD5::enable(bool enabled)
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{
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this->enabled = enabled;
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}
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void
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Pl_MD5::persistAcrossFinish(bool persist)
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{
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this->persist_across_finish = persist;
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}
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std::string
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Pl_MD5::getHexDigest()
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{
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if (!this->enabled) {
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throw std::logic_error("digest requested for a disabled MD5 Pipeline");
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}
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this->in_progress = false;
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return this->md5.unparse();
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}
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