+bool wxSoundAiff::CanRead()
+{
+ wxUint32 signature1, signature2, len;
+
+ if (m_input->Read(&signature1, 4).LastRead() != 4)
+ return FALSE;
+
+ if (wxUINT32_SWAP_ON_BE(signature1) != FORM_SIGNATURE) {
+ m_input->Ungetch(&signature1, 4);
+ return FALSE;
+ }
+
+ m_input->Read(&len, 4);
+ if (m_input->LastRead() != 4) {
+ m_input->Ungetch(&len, m_input->LastRead());
+ m_input->Ungetch(&signature1, 4);
+ return FALSE;
+ }
+
+ if (m_input->Read(&signature2, 4).LastRead() != 4) {
+ m_input->Ungetch(&signature2, m_input->LastRead());
+ m_input->Ungetch(&len, 4);
+ m_input->Ungetch(&signature1, 4);
+ return FALSE;
+ }
+
+ m_input->Ungetch(&signature2, 4);
+ m_input->Ungetch(&len, 4);
+ m_input->Ungetch(&signature1, 4);
+
+ if (
+ wxUINT32_SWAP_ON_BE(signature2) != AIFF_SIGNATURE &&
+ wxUINT32_SWAP_ON_BE(signature2) != AIFC_SIGNATURE)
+ return FALSE;
+
+ return TRUE;
+}
+