Class: Zstd::StreamingDecompress

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Object 



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# File 'ext/zstdruby/streaming_decompress.c', line 50

static VALUE
rb_streaming_decompress_initialize(VALUE obj)
{
  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* ctx = ZSTD_createDCtx();
  if (ctx == NULL) {
    rb_raise(rb_eRuntimeError, "%s", "ZSTD_createDCtx error");
  }
  sd->ctx = ctx;
  sd->buf = rb_str_new(NULL, buffOutSize);
  sd->buf_size = buffOutSize;

  return obj;
}

Instance Method Details

#<<(src) ⇒ Object 



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# File 'ext/zstdruby/streaming_decompress.c', line 91

static VALUE
rb_streaming_decompress_addstr(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);

  while (input.pos < input.size) {
    ZSTD_outBuffer output = { (void*)output_data, sd->buf_size, 0 };
    size_t const result = ZSTD_decompressStream(sd->ctx, &output, &input);
    if (ZSTD_isError(result)) {
      rb_raise(rb_eRuntimeError, "compress error error code: %s", ZSTD_getErrorName(result));
    }
  }
  return obj;
}

#decompress(src) ⇒ Object 



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# File 'ext/zstdruby/streaming_decompress.c', line 68

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_decompressStream(sd->ctx, &output, &input);
    if (ZSTD_isError(ret)) {
      rb_raise(rb_eRuntimeError, "compress error error code: %s", ZSTD_getErrorName(ret));
    }
    rb_str_cat(result, output.dst, output.pos);
  }
  return result;
}