portable_io.h

   1 static inline uint64_t read_portable(unsigned bits, const char *buf)
   2 {
   3         uint64_t ret = 0;
   4         int i, num_bytes = bits / 8;
   5
   6         for (i = 0; i < num_bytes; i++) {
   7                 unsigned char c = buf[i];
   8                 ret += ((uint64_t)c << (8 * i));
   9         }
  10         return ret;
  11 }
  12
  13 static inline uint64_t read_u64(const char *buf)
  14 {
  15         return read_portable(64, buf);
  16 }
  17
  18 static inline uint32_t read_u32(const char *buf)
  19 {
  20         return read_portable(32, buf);
  21 }
  22
  23 static inline uint16_t read_u16(const char *buf)
  24 {
  25         return read_portable(16, buf);
  26 }
  27
  28 static inline uint8_t read_u8(const char *buf)
  29 {
  30         return read_portable(8, buf);
  31 }
  32
  33 static inline void write_portable(unsigned bits, char *buf, uint64_t val)
  34 {
  35         int i, num_bytes = bits / 8;
  36 //      fprintf(stderr, "val: %lu\n", val);
  37         for (i = 0; i < num_bytes; i++) {
  38                 buf[i] = val & 0xff;
  39 //              fprintf(stderr, "buf[%d]=%x\n", i, buf[i]);
  40                 val = val >> 8;
  41         }
  42 }
  43
  44 static inline void write_u64(char *buf, uint64_t val)
  45 {
  46         write_portable(64, buf, val);
  47 }
  48
  49 static inline void write_u32(char *buf, uint32_t val)
  50 {
  51         write_portable(32, buf, (uint64_t) val);
  52 }
  53
  54 static inline void write_u16(char *buf, uint16_t val)
  55 {
  56         write_portable(16, buf, (uint64_t) val);
  57 }
  58
  59 static inline void write_u8(char *buf, uint8_t val)
  60 {
  61         write_portable(8, buf, (uint64_t) val);
  62 }