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Pl_RC4.cc

#include <qpdf/Pl_RC4.hh>

#include <qpdf/QUtil.hh>

Pl_RC4::Pl_RC4(char const* identifier, Pipeline* next,
             unsigned char const* key_data, int key_len,
             int out_bufsize) :
    Pipeline(identifier, next),
    out_bufsize(out_bufsize),
    rc4(key_data, key_len)
{
    this->outbuf = new unsigned char[out_bufsize];
}

Pl_RC4::~Pl_RC4()
{
    if (this->outbuf)
    {
      delete [] this->outbuf;
      this->outbuf = 0;
    }
}

void
Pl_RC4::write(unsigned char* data, int len)
{
    if (this->outbuf == 0)
    {
      throw Exception(
          this->identifier +
          ": Pl_RC4: write() called after finish() called");
    }

    int bytes_left = len;
    unsigned char* p = data;

    while (bytes_left > 0)
    {
      int bytes = (bytes_left < this->out_bufsize ? bytes_left : out_bufsize);
      bytes_left -= bytes;
      rc4.process(p, bytes, outbuf);
      p += bytes;
      getNext()->write(outbuf, bytes);
    }
}

void
Pl_RC4::finish()
{
    if (this->outbuf)
    {
      delete [] this->outbuf;
      this->outbuf = 0;
    }
    this->getNext()->finish();
}

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