#include #include #include #include #include static void read_bytes(FILE *fp, uint8_t *dest, size_t size) { size_t bytes_copied; if (!size) return; bytes_copied = fread(dest, 1, size, fp); if (bytes_copied < size) { if (ferror(fp)) fprintf(stderr, "error: fread failed: %s\n", strerror(errno)); else fprintf(stderr, "error: unexpected end of file\n"); exit(EXIT_FAILURE); } } static uint32_t read_u32(FILE *fp) { uint8_t dest[4]; read_bytes(fp, dest, sizeof(dest)); return dest[0] | (dest[1] << 8) | (dest[2] << 16) | (dest[3] << 24); } static uint16_t read_u16(FILE *fp) { uint8_t dest[2]; read_bytes(fp, dest, sizeof(dest)); return dest[0] | (dest[1] << 8); } static uint16_t read_u8(FILE *fp) { uint8_t dest; read_bytes(fp, &dest, sizeof(dest)); return dest; } static void write_bytes(FILE *fp, const uint8_t *dest, size_t size) { if (!size) return; if (fwrite(dest, 1, size, fp) != size) { fprintf(stderr, "error: fwrite failed: %s\n", strerror(errno)); exit(EXIT_FAILURE); } } static void write_u32(FILE *fp, uint32_t x) { uint8_t dest[4]; dest[0] = (uint8_t)x; dest[1] = (uint8_t)(x>>8); dest[2] = (uint8_t)(x>>16); dest[3] = (uint8_t)(x>>24); write_bytes(fp, dest, sizeof(dest)); } static void write_u16(FILE *fp, uint16_t x) { uint8_t dest[2]; dest[0] = (uint8_t)x; dest[1] = (uint8_t)(x>>8); write_bytes(fp, dest, sizeof(dest)); } static void write_u8(FILE *fp, uint8_t x) { write_bytes(fp, &x, sizeof(x)); }