awesome!!!

third-party/physfs/src/physfs_byteorder.c

@@ -0,0 +1,137 @@
+/**
+ * PhysicsFS; a portable, flexible file i/o abstraction.
+ *
+ * Documentation is in physfs.h. It's verbose, honest.  :)
+ *
+ * Please see the file LICENSE.txt in the source's root directory.
+ *
+ *  This file written by Ryan C. Gordon.
+ */
+
+#define __PHYSICSFS_INTERNAL__
+#include "physfs_internal.h"
+
+#ifndef PHYSFS_Swap16
+static inline PHYSFS_uint16 PHYSFS_Swap16(PHYSFS_uint16 D)
+{
+    return ((D<<8)|(D>>8));
+}
+#endif
+#ifndef PHYSFS_Swap32
+static inline PHYSFS_uint32 PHYSFS_Swap32(PHYSFS_uint32 D)
+{
+    return ((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
+}
+#endif
+#ifndef PHYSFS_NO_64BIT_SUPPORT
+#ifndef PHYSFS_Swap64
+static inline PHYSFS_uint64 PHYSFS_Swap64(PHYSFS_uint64 val) {
+    PHYSFS_uint32 hi, lo;
+
+    /* Separate into high and low 32-bit values and swap them */
+    lo = (PHYSFS_uint32)(val&0xFFFFFFFF);
+    val >>= 32;
+    hi = (PHYSFS_uint32)(val&0xFFFFFFFF);
+    val = PHYSFS_Swap32(lo);
+    val <<= 32;
+    val |= PHYSFS_Swap32(hi);
+    return val;
+}
+#endif
+#else
+#ifndef PHYSFS_Swap64
+/* This is mainly to keep compilers from complaining in PHYSFS code.
+   If there is no real 64-bit datatype, then compilers will complain about
+   the fake 64-bit datatype that PHYSFS provides when it compiles user code.
+*/
+#define PHYSFS_Swap64(X)    (X)
+#endif
+#endif /* PHYSFS_NO_64BIT_SUPPORT */
+
+
+/* Byteswap item from the specified endianness to the native endianness */
+#if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
+PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return x; }
+PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return x; }
+PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return x; }
+PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return x; }
+PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return x; }
+PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return x; }
+
+PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return PHYSFS_Swap16(x); }
+PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return PHYSFS_Swap16(x); }
+PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return PHYSFS_Swap32(x); }
+PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return PHYSFS_Swap32(x); }
+PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return PHYSFS_Swap64(x); }
+PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return PHYSFS_Swap64(x); }
+#else
+PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return PHYSFS_Swap16(x); }
+PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return PHYSFS_Swap16(x); }
+PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return PHYSFS_Swap32(x); }
+PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return PHYSFS_Swap32(x); }
+PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return PHYSFS_Swap64(x); }
+PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return PHYSFS_Swap64(x); }
+
+PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return x; }
+PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return x; }
+PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return x; }
+PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return x; }
+PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return x; }
+PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return x; }
+#endif
+
+static inline int readAll(PHYSFS_File *file, void *val, const size_t len)
+{
+    return (PHYSFS_readBytes(file, val, len) == len);
+} /* readAll */
+
+#define PHYSFS_BYTEORDER_READ(datatype, swaptype) \
+    int PHYSFS_read##swaptype(PHYSFS_File *file, PHYSFS_##datatype *val) { \
+        PHYSFS_##datatype in; \
+        BAIL_IF(val == NULL, PHYSFS_ERR_INVALID_ARGUMENT, 0); \
+        BAIL_IF_ERRPASS(!readAll(file, &in, sizeof (in)), 0); \
+        *val = PHYSFS_swap##swaptype(in); \
+        return 1; \
+    }
+
+PHYSFS_BYTEORDER_READ(sint16, SLE16)
+PHYSFS_BYTEORDER_READ(uint16, ULE16)
+PHYSFS_BYTEORDER_READ(sint16, SBE16)
+PHYSFS_BYTEORDER_READ(uint16, UBE16)
+PHYSFS_BYTEORDER_READ(sint32, SLE32)
+PHYSFS_BYTEORDER_READ(uint32, ULE32)
+PHYSFS_BYTEORDER_READ(sint32, SBE32)
+PHYSFS_BYTEORDER_READ(uint32, UBE32)
+PHYSFS_BYTEORDER_READ(sint64, SLE64)
+PHYSFS_BYTEORDER_READ(uint64, ULE64)
+PHYSFS_BYTEORDER_READ(sint64, SBE64)
+PHYSFS_BYTEORDER_READ(uint64, UBE64)
+
+
+static inline int writeAll(PHYSFS_File *f, const void *val, const size_t len)
+{
+    return (PHYSFS_writeBytes(f, val, len) == len);
+} /* writeAll */
+
+#define PHYSFS_BYTEORDER_WRITE(datatype, swaptype) \
+    int PHYSFS_write##swaptype(PHYSFS_File *file, PHYSFS_##datatype val) { \
+        const PHYSFS_##datatype out = PHYSFS_swap##swaptype(val); \
+        BAIL_IF_ERRPASS(!writeAll(file, &out, sizeof (out)), 0); \
+        return 1; \
+    }
+
+PHYSFS_BYTEORDER_WRITE(sint16, SLE16)
+PHYSFS_BYTEORDER_WRITE(uint16, ULE16)
+PHYSFS_BYTEORDER_WRITE(sint16, SBE16)
+PHYSFS_BYTEORDER_WRITE(uint16, UBE16)
+PHYSFS_BYTEORDER_WRITE(sint32, SLE32)
+PHYSFS_BYTEORDER_WRITE(uint32, ULE32)
+PHYSFS_BYTEORDER_WRITE(sint32, SBE32)
+PHYSFS_BYTEORDER_WRITE(uint32, UBE32)
+PHYSFS_BYTEORDER_WRITE(sint64, SLE64)
+PHYSFS_BYTEORDER_WRITE(uint64, ULE64)
+PHYSFS_BYTEORDER_WRITE(sint64, SBE64)
+PHYSFS_BYTEORDER_WRITE(uint64, UBE64)
+
+/* end of physfs_byteorder.c ... */
+