+
+/*****************************************************************************
+ * iconv wrapper
+ *****************************************************************************/
+vlc_iconv_t vlc_iconv_open( const char *tocode, const char *fromcode )
+{
+#if defined(HAVE_ICONV)
+ return iconv_open( tocode, fromcode );
+#else
+ return NULL;
+#endif
+}
+
+size_t vlc_iconv( vlc_iconv_t cd, char **inbuf, size_t *inbytesleft,
+ char **outbuf, size_t *outbytesleft )
+{
+#if defined(HAVE_ICONV)
+ return iconv( cd, inbuf, inbytesleft, outbuf, outbytesleft );
+#else
+ int i_bytes = __MIN(*inbytesleft, *outbytesleft);
+ if( !inbuf || !outbuf || !i_bytes ) return (size_t)(-1);
+ memcpy( *outbuf, *inbuf, i_bytes );
+ inbuf += i_bytes;
+ outbuf += i_bytes;
+ inbytesleft -= i_bytes;
+ outbytesleft -= i_bytes;
+ return i_bytes;
+#endif
+}
+
+int vlc_iconv_close( vlc_iconv_t cd )
+{
+#if defined(HAVE_ICONV)
+ return iconv_close( cd );
+#else
+ return 0;
+#endif
+}
+
+/*****************************************************************************
+ * reduce a fraction
+ * (adapted from libavcodec, author Michael Niedermayer <michaelni@gmx.at>)
+ *****************************************************************************/
+vlc_bool_t vlc_reduce( int *pi_dst_nom, int *pi_dst_den,
+ int64_t i_nom, int64_t i_den, int64_t i_max )
+{
+ vlc_bool_t b_exact = 1, b_sign = 0;
+ int64_t i_gcd;
+
+ if( i_den == 0 )
+ {
+ *pi_dst_nom = 0;
+ *pi_dst_den = 1;
+ return 1;
+ }
+
+ if( i_den < 0 )
+ {
+ i_den = - i_den;
+ i_nom = - i_nom;
+ }
+
+ if( i_nom < 0 )
+ {
+ i_nom = - i_nom;
+ b_sign = 1;
+ }
+
+ i_gcd = GCD( i_nom, i_den );
+ i_nom /= i_gcd;
+ i_den /= i_gcd;
+
+ if( i_max == 0 ) i_max = I64C(0xFFFFFFFF);
+
+ if( i_nom > i_max || i_den > i_max )
+ {
+ int i_a0_num = 0, i_a0_den = 1, i_a1_num = 1, i_a1_den = 0;
+ b_exact = 0;
+
+ for( ; ; )
+ {
+ int64_t i_x = i_nom / i_den;
+ int64_t i_a2n = i_x * i_a1_num + i_a0_num;
+ int64_t i_a2d = i_x * i_a1_den + i_a0_den;
+
+ if( i_a2n > i_max || i_a2d > i_max ) break;
+
+ i_nom %= i_den;
+
+ i_a0_num = i_a1_num; i_a0_den = i_a1_den;
+ i_a1_num = i_a2n; i_a1_den = i_a2d;
+ if( i_nom == 0 ) break;
+ i_x = i_nom; i_nom = i_den; i_den = i_x;
+ }
+ i_nom = i_a1_num;
+ i_den = i_a1_den;
+ }
+
+ if( b_sign ) i_nom = - i_nom;
+
+ *pi_dst_nom = i_nom;
+ *pi_dst_den = i_den;
+
+ return b_exact;
+}