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This comment expands all tabs using an 8-character tab-width. You should ignore this commit when using git blame or use git blame -w. In the early days, I used to use tabs where possible for indentation, since emacs did this automatically. In recent years, I have switched to only using spaces, which means qpdf source code has been a mixture of spaces and tabs. I have avoided cleaning this up because of not wanting gratuitous whitespaces change to cloud the output of git blame, but I changed my mind after discussing with users who view qpdf source code in editors/IDEs that have other tab widths by default and in light of the fact that I am planning to start applying automatic code formatting soon.
94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
#include <qpdf/Pl_SHA2.hh>
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#include <stdexcept>
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#include <cstdio>
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#include <qpdf/PointerHolder.hh>
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#include <qpdf/QUtil.hh>
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#include <qpdf/QPDFCryptoProvider.hh>
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Pl_SHA2::Pl_SHA2(int bits, Pipeline* next) :
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Pipeline("sha2", next),
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in_progress(false)
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{
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if (bits)
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{
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resetBits(bits);
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}
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}
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Pl_SHA2::~Pl_SHA2()
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{
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}
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void
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Pl_SHA2::write(unsigned char* buf, size_t len)
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{
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if (! this->in_progress)
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{
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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.
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// 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* data = buf;
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while (bytes_left > 0)
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{
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size_t bytes = (bytes_left >= max_bytes ? max_bytes : bytes_left);
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this->crypto->SHA2_update(data, bytes);
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bytes_left -= bytes;
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data += bytes;
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}
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if (this->getNext(true))
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{
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this->getNext()->write(buf, len);
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}
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}
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void
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Pl_SHA2::finish()
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{
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if (this->getNext(true))
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{
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this->getNext()->finish();
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}
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this->crypto->SHA2_finalize();
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this->in_progress = false;
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}
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void
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Pl_SHA2::resetBits(int bits)
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{
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if (this->in_progress)
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{
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throw std::logic_error(
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"bit reset requested for in-progress SHA2 Pipeline");
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}
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this->crypto = QPDFCryptoProvider::getImpl();
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this->crypto->SHA2_init(bits);
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}
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std::string
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Pl_SHA2::getRawDigest()
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{
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if (this->in_progress)
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{
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throw std::logic_error(
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"digest requested for in-progress SHA2 Pipeline");
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}
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return this->crypto->SHA2_digest();
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}
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std::string
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Pl_SHA2::getHexDigest()
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{
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if (this->in_progress)
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{
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throw std::logic_error(
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"digest requested for in-progress SHA2 Pipeline");
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}
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return QUtil::hex_encode(getRawDigest());
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}
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