mirror of https://github.com/qpdf/qpdf.git
50 lines
1.0 KiB
C++
50 lines
1.0 KiB
C++
#include <qpdf/Pl_RC4.hh>
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#include <qpdf/QUtil.hh>
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Pl_RC4::Pl_RC4(char const* identifier, Pipeline* next,
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unsigned char const* key_data, int key_len,
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size_t out_bufsize) :
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Pipeline(identifier, next),
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out_bufsize(out_bufsize),
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rc4(key_data, key_len)
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{
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this->outbuf = PointerHolder<unsigned char>(
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true, new unsigned char[out_bufsize]);
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}
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Pl_RC4::~Pl_RC4()
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{
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}
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void
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Pl_RC4::write(unsigned char* data, size_t len)
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{
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if (this->outbuf.getPointer() == 0)
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{
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throw std::logic_error(
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this->identifier +
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": Pl_RC4: write() called after finish() called");
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}
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size_t bytes_left = len;
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unsigned char* p = data;
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while (bytes_left > 0)
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{
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size_t bytes =
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(bytes_left < this->out_bufsize ? bytes_left : out_bufsize);
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bytes_left -= bytes;
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// lgtm[cpp/weak-cryptographic-algorithm]
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rc4.process(p, bytes, outbuf.getPointer());
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p += bytes;
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getNext()->write(outbuf.getPointer(), bytes);
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}
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}
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void
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Pl_RC4::finish()
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{
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this->outbuf = 0;
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this->getNext()->finish();
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}
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