Class: PNG::Decoder

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

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object 



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# File 'ext/png/png.c', line 1345

static VALUE
rb_decoder_initialize(int argc, VALUE* argv, VALUE self)
{
  png_decoder_t* ptr;
  VALUE exc;
  VALUE opts;

  /*
   * initialize
   */
  exc = Qnil;

  /*
   * strip object
   */
  TypedData_Get_Struct(self, png_decoder_t, &png_decoder_data_type, ptr);

  /*
   * parse argument
   */
  rb_scan_args(argc, argv, "0:", &opts);

  /*
   * set context
   */
  exc = set_decoder_context(ptr, opts);

  /*
   * post process
   */
  if (RTEST(exc)) rb_exc_raise(exc);

  return Qtrue;
}

Instance Method Details

#decode(data) ⇒ Object Also known as: decompress, << 



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# File 'ext/png/png.c', line 2064

static VALUE
rb_decoder_decode(VALUE self, VALUE data)
{
  VALUE ret;
  png_decoder_t* ptr;
  decode_arg_t arg;

  /*
   * argument check
   */
  Check_Type(data, T_STRING);

  if (png_sig_cmp((png_const_bytep)RSTRING_PTR(data), 0, 8)) {
    RUNTIME_ERROR("Invalid PNG signature.");
  }

  /*
   * strip object
   */
  TypedData_Get_Struct(self, png_decoder_t, &png_decoder_data_type, ptr);

  /*
   * call decode funcs
   */
  arg.ptr  = ptr;
  arg.data = data;

  if (ptr->common.api_type == API_SIMPLIFIED) {
    ret = rb_ensure(decode_simplified_api_body, (VALUE)&arg,
                    decode_simplified_api_ensure, (VALUE)ptr);

  } else {
    ret = rb_ensure(decode_classic_api_body, (VALUE)&arg,
                    decode_classic_api_ensure, (VALUE)ptr);
  }

  return ret;
}

#read_header(data) ⇒ Object 



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# File 'ext/png/png.c', line 1830

static VALUE
rb_decoder_read_header(VALUE self, VALUE data)
{
  VALUE ret;
  png_decoder_t* ptr;
  read_header_arg_t arg;

  /*
   * argument check
   */
  Check_Type(data, T_STRING);

  if (RSTRING_LEN(data) < 8) {
    RUNTIME_ERROR("data too short.");
  }

  if (png_sig_cmp((png_const_bytep)RSTRING_PTR(data), 0, 8)) {
    RUNTIME_ERROR("Invalid PNG signature.");
  }

  /*
   * strip object
   */
  TypedData_Get_Struct(self, png_decoder_t, &png_decoder_data_type, ptr);

  /*
   * call read header funciton
   */
  arg.ptr  = ptr;
  arg.data = data;

  ret = rb_ensure(read_header_body, (VALUE)&arg,
                  read_header_ensure, (VALUE)ptr);

  return ret;
}