4 #include <stdio.h> /* for FILE typedef*/
5 #include <stdint.h> /* for uint16_t, uint32_t */
9 /* Read/write "x" from/to "file" as bigendian representation of "size" bits. */
10 static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size);
11 static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size);
15 static uint8_t read_uintX_bigendian(FILE * file, uint32_t * x, uint8_t size)
21 int16_t bitshift = size - 8;
25 for (; bitshift >= 0; bitshift = bitshift - 8)
32 * x = * x + ((uint32_t) test << bitshift);
39 static uint8_t write_uintX_bigendian(FILE * file, uint32_t x, uint8_t size)
45 int16_t bitshift = size - 8;
47 for (; bitshift >= 0; bitshift = bitshift - 8)
49 if (EOF == fputc((x >> bitshift) & 0xFF, file))
59 extern uint8_t read_uint8(FILE * file, uint8_t * x)
62 uint8_t err = read_uintX_bigendian(file, &y, 8);
69 extern uint8_t read_uint16_bigendian(FILE * file, uint16_t * x)
72 uint8_t err = read_uintX_bigendian(file, &y, 16);
79 extern uint8_t read_uint32_bigendian(FILE * file, uint32_t * x)
81 return read_uintX_bigendian(file, x, 32);
86 extern uint8_t write_uint8(uint8_t x, FILE * file)
88 return write_uintX_bigendian(file, x, 8);
93 extern uint8_t write_uint16_bigendian(uint16_t x, FILE * file)
95 return write_uintX_bigendian(file, x, 16);
100 extern uint8_t write_uint32_bigendian(uint32_t x, FILE * file)
102 return write_uintX_bigendian(file, x, 32);