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7zlzma.cc

#include "7z.h"

#include "LZMAEncoder.h"
#include "LZMADecoder.h"

bool compress_lzma_7z(const unsigned char* in_data, unsigned in_size, unsigned char* out_data, unsigned& out_size, unsigned algo, unsigned dictionary_size, unsigned num_fast_bytes) throw () {
      try {
            NCompress::NLZMA::CEncoder cc;

            // reduce the dictionary size if the file is small
            while (dictionary_size > 8 && dictionary_size / 2 >= out_size)
                  dictionary_size /= 2;

            if (cc.SetDictionarySize(dictionary_size) != S_OK)
                  return false;

            if (cc.SetEncoderNumFastBytes(num_fast_bytes) != S_OK)
                  return false;

            if (cc.SetEncoderAlgorithm(algo) != S_OK)
                  return false;

            ISequentialInStream in(reinterpret_cast<const char*>(in_data), in_size);
            ISequentialOutStream out(reinterpret_cast<char*>(out_data), out_size);

            UINT64 in_size_l = in_size;

            if (cc.WriteCoderProperties(&out) != S_OK)
                  return false;

            if (cc.Code(&in, &out, &in_size_l) != S_OK)
                  return false;

            out_size = out.size_get();

            if (out.overflow_get())
                  return false;

            return true;
      } catch (...) {
            return false;
      }
}

bool decompress_lzma_7z(const unsigned char* in_data, unsigned in_size, unsigned char* out_data, unsigned out_size) throw () {
      try {
            NCompress::NLZMA::CDecoder cc;

            ISequentialInStream in(reinterpret_cast<const char*>(in_data), in_size);
            ISequentialOutStream out(reinterpret_cast<char*>(out_data), out_size);

            UINT64 in_size_l = in_size;
            UINT64 out_size_l = out_size;

            if (cc.ReadCoderProperties(&in) != S_OK)
                  return false;

            if (cc.Code(&in, &out, &in_size_l, &out_size_l) != S_OK)
                  return false;

            if (out.size_get() != out_size || out.overflow_get())
                  return false;

            return true;
      } catch (...) {
            return false;
      }
}

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