Class: Zstd::StreamingDecompress

Inherits:
Object
  • Object
show all
Defined in:
ext/zstdruby/streaming_decompress.c

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/zstdruby/streaming_decompress.c', line 70

static VALUE
rb_streaming_decompress_initialize(int argc, VALUE *argv, VALUE obj)
{
  VALUE kwargs;
  rb_scan_args(argc, argv, "00:", &kwargs);

  struct streaming_decompress_t* sd;
  TypedData_Get_Struct(obj, struct streaming_decompress_t, &streaming_decompress_type, sd);
  size_t const buffOutSize = ZSTD_DStreamOutSize();

  ZSTD_DCtx* dctx = ZSTD_createDCtx();
  if (dctx == NULL) {
    rb_raise(rb_eRuntimeError, "%s", "ZSTD_createDCtx error");
  }
  set_decompress_params(dctx, kwargs);

  sd->dctx = dctx;
  sd->buf = rb_str_new(NULL, buffOutSize);
  sd->buf_size = buffOutSize;

  return obj;
}

Instance Method Details

#decompress(src) ⇒ Object 



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# File 'ext/zstdruby/streaming_decompress.c', line 93

static VALUE
rb_streaming_decompress_decompress(VALUE obj, VALUE src)
{
  StringValue(src);
  const char* input_data = RSTRING_PTR(src);
  size_t input_size = RSTRING_LEN(src);
  ZSTD_inBuffer input = { input_data, input_size, 0 };

  struct streaming_decompress_t* sd;
  TypedData_Get_Struct(obj, struct streaming_decompress_t, &streaming_decompress_type, sd);
  const char* output_data = RSTRING_PTR(sd->buf);
  VALUE result = rb_str_new(0, 0);
  while (input.pos < input.size) {
    ZSTD_outBuffer output = { (void*)output_data, sd->buf_size, 0 };
    size_t const ret = zstd_stream_decompress(sd->dctx, &output, &input, false);
    if (ZSTD_isError(ret)) {
      rb_raise(rb_eRuntimeError, "decompress error error code: %s", ZSTD_getErrorName(ret));
    }
    rb_str_cat(result, output.dst, output.pos);
  }
  return result;
}