Merge CV, ver=5.1; ops/methods from HV, and interface from CV where possible

[goodguy/history.git] / cinelerra-5.1 / cinelerra / byteorder.h

diff --git a/cinelerra-5.1/cinelerra/byteorder.h b/cinelerra-5.1/cinelerra/byteorder.h
new file mode 100644 (file)
index 0000000..acbdb2c
--- /dev/null
+++ b/cinelerra-5.1/cinelerra/byteorder.h
@@ -0,0 +1,123 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef BYTEORDER_H
+#define BYTEORDER_H
+
+#include <sys/types.h>
+
+inline int get_byte_order()
+{                // 1 if little endian
+       return (*(const u_int32_t*)"a   ") & 0x00000001;
+}
+
+#define SWAP_ITERATE \
+       byte1 = buffer1[i]; \
+       byte2 = buffer2[i]; \
+       buffer1[i] = byte2; \
+       buffer2[i] = byte1; \
+       i += 2;
+
+#define SWAP_24BIT_ITERATE \
+       byte1 = buffer1[i]; \
+       byte2 = buffer2[i]; \
+       byte3 = buffer3[i]; \
+       buffer1[i] = byte3; \
+       buffer2[i] = byte2; \
+       buffer3[i] = byte1; \
+       i += 3;
+
+#define SWAP_32BIT_ITERATE \
+       byte1 = buffer1[i]; \
+       byte2 = buffer2[i]; \
+       byte3 = buffer3[i]; \
+       byte4 = buffer4[i]; \
+       buffer1[i] = byte4; \
+       buffer2[i] = byte1; \
+       buffer3[i] = byte2; \
+       buffer4[i] = byte3; \
+       i += 4;
+
+inline int swap_bytes(int wordsize, unsigned char *buffer, long len)
+{
+       register unsigned char byte1, byte2, byte3, byte4;
+       register unsigned char *buffer1 = buffer;
+       register unsigned char *buffer2 = buffer + 1;
+       register unsigned char *buffer3 = buffer + 2;
+       register unsigned char *buffer4 = buffer + 3;
+       register long i = 0;
+
+//printf("swap bytes\n");
+
+       switch( wordsize ) {
+       case 1:
+               return 0;
+
+       case 2:
+               len -= 8;
+               while( i < len ) {
+                       SWAP_ITERATE
+                       SWAP_ITERATE
+                       SWAP_ITERATE
+                       SWAP_ITERATE
+               }
+
+               len += 8;
+               while( i < len ) {
+                       SWAP_ITERATE
+               }
+               return 0;
+
+       case 3:
+               len -= 12;
+               while( i < len ) {
+                       SWAP_24BIT_ITERATE
+                       SWAP_24BIT_ITERATE
+                       SWAP_24BIT_ITERATE
+                       SWAP_24BIT_ITERATE
+               }
+
+               len += 12;
+               while( i < len ) {
+                       SWAP_24BIT_ITERATE
+               }
+               return 0;
+
+       case 4:
+               len -= 16;
+               while( i < len ) {
+                       SWAP_32BIT_ITERATE
+                       SWAP_32BIT_ITERATE
+                       SWAP_32BIT_ITERATE
+                       SWAP_32BIT_ITERATE
+               }
+
+               len += 16;
+               while( i < len ) {
+                       SWAP_32BIT_ITERATE
+               }
+               return 0;
+       }
+
+       return 1;
+}
+
+#endif