Method: Magick::Image#decipher

Defined in:
ext/RMagick/rmimage.cpp

#decipher(passphrase) ⇒ Magick::Image

Decipher an enciphered image.

Parameters:

  • passphrase (String) —

    The passphrase used to encipher the image.

Returns:



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# File 'ext/RMagick/rmimage.cpp', line 5231

VALUE
Image_decipher(VALUE self, VALUE passphrase)
{
    Image *image, *new_image;
    char *pf;
    ExceptionInfo *exception;
    MagickBooleanType okay;

    image = rm_check_destroyed(self);
    pf = StringValueCStr(passphrase);      // ensure passphrase is a string
    exception = AcquireExceptionInfo();

    new_image = rm_clone_image(image);

    GVL_STRUCT_TYPE(DecipherImage) args = { new_image, pf, exception };
    void *ret = CALL_FUNC_WITHOUT_GVL(GVL_FUNC(DecipherImage), &args);
    okay = static_cast<MagickBooleanType>(reinterpret_cast<intptr_t &>(ret));
    rm_check_exception(exception, new_image, DestroyOnError);
    if (!okay)
    {
        DestroyImage(new_image);
        rb_raise(rb_eRuntimeError, "DecipherImage failed for unknown reason.");
    }

    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}