libgphoto2 photo camera library (libgphoto2) API 2.4.10
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00001 /* This file is generated automatically by configure */ 00002 /* It is valid only for the system type i686-pc-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*/