src/physfs_byteorder.c
author Ryan C. Gordon <icculus@icculus.org>
Sun, 17 May 2020 01:41:52 -0400
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/**
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 * PhysicsFS; a portable, flexible file i/o abstraction.
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 *
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 * Documentation is in physfs.h. It's verbose, honest.  :)
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 *
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 * Please see the file LICENSE.txt in the source's root directory.
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 *
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 *  This file written by Ryan C. Gordon.
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 */
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#define __PHYSICSFS_INTERNAL__
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#include "physfs_internal.h"
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#ifndef PHYSFS_Swap16
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static inline PHYSFS_uint16 PHYSFS_Swap16(PHYSFS_uint16 D)
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{
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    return ((D<<8)|(D>>8));
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}
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#endif
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#ifndef PHYSFS_Swap32
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static inline PHYSFS_uint32 PHYSFS_Swap32(PHYSFS_uint32 D)
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{
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    return ((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
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}
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#endif
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#ifndef PHYSFS_NO_64BIT_SUPPORT
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#ifndef PHYSFS_Swap64
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static inline PHYSFS_uint64 PHYSFS_Swap64(PHYSFS_uint64 val) {
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    PHYSFS_uint32 hi, lo;
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    /* Separate into high and low 32-bit values and swap them */
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    lo = (PHYSFS_uint32)(val&0xFFFFFFFF);
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    val >>= 32;
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    hi = (PHYSFS_uint32)(val&0xFFFFFFFF);
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    val = PHYSFS_Swap32(lo);
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    val <<= 32;
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    val |= PHYSFS_Swap32(hi);
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    return val;
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}
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#endif
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#else
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#ifndef PHYSFS_Swap64
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/* This is mainly to keep compilers from complaining in PHYSFS code.
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   If there is no real 64-bit datatype, then compilers will complain about
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   the fake 64-bit datatype that PHYSFS provides when it compiles user code.
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*/
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#define PHYSFS_Swap64(X)    (X)
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#endif
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#endif /* PHYSFS_NO_64BIT_SUPPORT */
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/* Byteswap item from the specified endianness to the native endianness */
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#if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
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PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return x; }
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PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return x; }
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PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return x; }
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PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return x; }
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PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return x; }
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PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return x; }
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PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return PHYSFS_Swap16(x); }
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PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return PHYSFS_Swap16(x); }
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PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return PHYSFS_Swap32(x); }
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PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return PHYSFS_Swap32(x); }
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PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return PHYSFS_Swap64(x); }
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PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return PHYSFS_Swap64(x); }
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#else
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PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return PHYSFS_Swap16(x); }
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PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return PHYSFS_Swap16(x); }
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PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return PHYSFS_Swap32(x); }
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PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return PHYSFS_Swap32(x); }
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PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return PHYSFS_Swap64(x); }
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PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return PHYSFS_Swap64(x); }
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PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return x; }
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PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return x; }
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PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return x; }
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PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return x; }
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PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return x; }
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PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return x; }
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#endif
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static inline int readAll(PHYSFS_File *file, void *val, const size_t len)
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{
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    return (PHYSFS_readBytes(file, val, len) == len);
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} /* readAll */
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#define PHYSFS_BYTEORDER_READ(datatype, swaptype) \
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    int PHYSFS_read##swaptype(PHYSFS_File *file, PHYSFS_##datatype *val) { \
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        PHYSFS_##datatype in; \
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        BAIL_IF(val == NULL, PHYSFS_ERR_INVALID_ARGUMENT, 0); \
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        BAIL_IF_ERRPASS(!readAll(file, &in, sizeof (in)), 0); \
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        *val = PHYSFS_swap##swaptype(in); \
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        return 1; \
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    }
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PHYSFS_BYTEORDER_READ(sint16, SLE16)
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PHYSFS_BYTEORDER_READ(uint16, ULE16)
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PHYSFS_BYTEORDER_READ(sint16, SBE16)
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PHYSFS_BYTEORDER_READ(uint16, UBE16)
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PHYSFS_BYTEORDER_READ(sint32, SLE32)
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PHYSFS_BYTEORDER_READ(uint32, ULE32)
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PHYSFS_BYTEORDER_READ(sint32, SBE32)
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PHYSFS_BYTEORDER_READ(uint32, UBE32)
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PHYSFS_BYTEORDER_READ(sint64, SLE64)
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PHYSFS_BYTEORDER_READ(uint64, ULE64)
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PHYSFS_BYTEORDER_READ(sint64, SBE64)
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PHYSFS_BYTEORDER_READ(uint64, UBE64)
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static inline int writeAll(PHYSFS_File *f, const void *val, const size_t len)
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{
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    return (PHYSFS_writeBytes(f, val, len) == len);
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} /* writeAll */
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#define PHYSFS_BYTEORDER_WRITE(datatype, swaptype) \
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    int PHYSFS_write##swaptype(PHYSFS_File *file, PHYSFS_##datatype val) { \
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        const PHYSFS_##datatype out = PHYSFS_swap##swaptype(val); \
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        BAIL_IF_ERRPASS(!writeAll(file, &out, sizeof (out)), 0); \
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        return 1; \
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    }
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PHYSFS_BYTEORDER_WRITE(sint16, SLE16)
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PHYSFS_BYTEORDER_WRITE(uint16, ULE16)
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PHYSFS_BYTEORDER_WRITE(sint16, SBE16)
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PHYSFS_BYTEORDER_WRITE(uint16, UBE16)
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PHYSFS_BYTEORDER_WRITE(sint32, SLE32)
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PHYSFS_BYTEORDER_WRITE(uint32, ULE32)
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PHYSFS_BYTEORDER_WRITE(sint32, SBE32)
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PHYSFS_BYTEORDER_WRITE(uint32, UBE32)
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PHYSFS_BYTEORDER_WRITE(sint64, SLE64)
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PHYSFS_BYTEORDER_WRITE(uint64, ULE64)
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PHYSFS_BYTEORDER_WRITE(sint64, SBE64)
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PHYSFS_BYTEORDER_WRITE(uint64, UBE64)
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/* end of physfs_byteorder.c ... */
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