gphoto2-endian.h

00001 /* This file is generated automatically by configure */
00002 /* It is valid only for the system type i486-slackware-linux-gnu */
00003 
00004 #ifndef __BYTEORDER_H
00005 #define __BYTEORDER_H
00006 
00007 /* ntohl and relatives live here */
00008 #include <arpa/inet.h>
00009 
00010 /* Define generic byte swapping functions */
00011 #include <byteswap.h>
00012 #define swap16(x) bswap_16(x)
00013 #define swap32(x) bswap_32(x)
00014 #define swap64(x) bswap_64(x)
00015 
00016 /* The byte swapping macros have the form: */
00017 /*   EENN[a]toh or htoEENN[a] where EE is be (big endian) or */
00018 /* le (little-endian), NN is 16 or 32 (number of bits) and a, */
00019 /* if present, indicates that the endian side is a pointer to an */
00020 /* array of uint8_t bytes instead of an integer of the specified length. */
00021 /* h refers to the host's ordering method. */
00022 
00023 /* So, to convert a 32-bit integer stored in a buffer in little-endian */
00024 /* format into a uint32_t usable on this machine, you could use: */
00025 /*   uint32_t value = le32atoh(&buf[3]); */
00026 /* To put that value back into the buffer, you could use: */
00027 /*   htole32a(&buf[3], value); */
00028 
00029 /* Define aliases for the standard byte swapping macros */
00030 /* Arguments to these macros must be properly aligned on natural word */
00031 /* boundaries in order to work properly on all architectures */
00032 #ifndef htobe16
00033 # define htobe16(x) htons(x)
00034 #endif
00035 #ifndef htobe32
00036 # define htobe32(x) htonl(x)
00037 #endif
00038 #ifndef be16toh
00039 # define be16toh(x) ntohs(x)
00040 #endif
00041 #ifndef be32toh
00042 # define be32toh(x) ntohl(x)
00043 #endif
00044 
00045 #define HTOBE16(x) (x) = htobe16(x)
00046 #define HTOBE32(x) (x) = htobe32(x)
00047 #define BE32TOH(x) (x) = be32toh(x)
00048 #define BE16TOH(x) (x) = be16toh(x)
00049 
00050 /* On little endian machines, these macros are null */
00051 #ifndef htole16
00052 # define htole16(x)      (x)
00053 #endif
00054 #ifndef htole32
00055 # define htole32(x)      (x)
00056 #endif
00057 #ifndef htole64
00058 # define htole64(x)      (x)
00059 #endif
00060 #ifndef le16toh
00061 # define le16toh(x)      (x)
00062 #endif
00063 #ifndef le32toh
00064 # define le32toh(x)      (x)
00065 #endif
00066 #ifndef le64toh
00067 # define le64toh(x)      (x)
00068 #endif
00069 
00070 #define HTOLE16(x)      (void) (x)
00071 #define HTOLE32(x)      (void) (x)
00072 #define HTOLE64(x)      (void) (x)
00073 #define LE16TOH(x)      (void) (x)
00074 #define LE32TOH(x)      (void) (x)
00075 #define LE64TOH(x)      (void) (x)
00076 
00077 /* These don't have standard aliases */
00078 #ifndef htobe64
00079 # define htobe64(x)      swap64(x)
00080 #endif
00081 #ifndef be64toh
00082 # define be64toh(x)      swap64(x)
00083 #endif
00084 
00085 #define HTOBE64(x)      (x) = htobe64(x)
00086 #define BE64TOH(x)      (x) = be64toh(x)
00087 
00088 /* Define the C99 standard length-specific integer types */
00089 #include <_stdint.h>
00090 
00091 /* Here are some macros to create integers from a byte array */
00092 /* These are used to get and put integers from/into a uint8_t array */
00093 /* with a specific endianness.  This is the most portable way to generate */
00094 /* and read messages to a network or serial device.  Each member of a */
00095 /* packet structure must be handled separately. */
00096 
00097 /* The i386 and compatibles can handle unaligned memory access, */
00098 /* so use the optimized macros above to do this job */
00099 #ifndef be16atoh
00100 # define be16atoh(x)     be16toh(*(uint16_t*)(x))
00101 #endif
00102 #ifndef be32atoh
00103 # define be32atoh(x)     be32toh(*(uint32_t*)(x))
00104 #endif
00105 #ifndef be64atoh
00106 # define be64atoh(x)     be64toh(*(uint64_t*)(x))
00107 #endif
00108 #ifndef le16atoh
00109 # define le16atoh(x)     le16toh(*(uint16_t*)(x))
00110 #endif
00111 #ifndef le32atoh
00112 # define le32atoh(x)     le32toh(*(uint32_t*)(x))
00113 #endif
00114 #ifndef le64atoh
00115 # define le64atoh(x)     le64toh(*(uint64_t*)(x))
00116 #endif
00117 
00118 #ifndef htob16a
00119 # define htobe16a(a,x)   *(uint16_t*)(a) = htobe16(x)
00120 #endif
00121 #ifndef htobe32a
00122 # define htobe32a(a,x)   *(uint32_t*)(a) = htobe32(x)
00123 #endif
00124 #ifndef htobe64a
00125 # define htobe64a(a,x)   *(uint64_t*)(a) = htobe64(x)
00126 #endif
00127 #ifndef htole16a
00128 # define htole16a(a,x)   *(uint16_t*)(a) = htole16(x)
00129 #endif
00130 #ifndef htole32a
00131 # define htole32a(a,x)   *(uint32_t*)(a) = htole32(x)
00132 #endif
00133 #ifndef htole64a
00134 # define htole64a(a,x)   *(uint64_t*)(a) = htole64(x)
00135 #endif
00136 
00137 #endif /*__BYTEORDER_H*/

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