Exemplos de BE32_TO_CPU em C++ (Cpp)

Exemplo n.º 1

Arquivo: bstream.c Projeto: andreiw/polaris

static void
au_stream_rewind(bstreamhandle h)
{
	au_filehdr_t au;

	(void) lseek(h->bstr_fd, 0L, SEEK_SET);
	if (read(h->bstr_fd, &au, sizeof (au)) != sizeof (au)) {
		return;
	}

	if (lseek(h->bstr_fd, (long)(BE32_TO_CPU(au.au_offset)),
	    SEEK_SET) < 0) {
		return;
	}
}

Exemplo n.º 2

void mask_generation(uint8_t *seed, size_t seed_len, 
                     uint8_t *data, size_t data_len)
{
  sha1_ctx_t ctx;
  uint8_t mask[SHA1_DIGEST_LENGTH];
  uint32_t i, len, counter = 0;
  
  while (data_len > 0) {
    sha1_init(&ctx);
    sha1_update(&ctx, seed, seed_len);
    sha1_update(&ctx, (uint8_t*)&counter, 4);
    sha1_final(&ctx, mask);
    counter = CPU_TO_BE32(BE32_TO_CPU(counter) + 1);
    len = (data_len < SHA1_DIGEST_LENGTH) ? data_len : SHA1_DIGEST_LENGTH;
    for (i = 0; i < len; i++) *data++ ^= mask[i];
    data_len -= len; 
  }
}

Exemplo n.º 3

Arquivo: bstream.c Projeto: andreiw/polaris

bstreamhandle
open_au_read_stream(char *fname)
{
	bstreamhandle h;
	int fd, sav;
	au_filehdr_t *au;
	struct stat st;
	uint32_t data_size;

	au = NULL;
	str_errno = 0;
	fd = open(fname, O_RDONLY);
	if (fd < 0)
		return (NULL);

	if (fstat(fd, &st) < 0) {
		goto au_open_failed;
	}
	if ((st.st_mode & S_IFMT) != S_IFREG) {
		str_errno = STR_ERR_NO_REG_FILE;
		goto au_open_failed;
	}
	au = (au_filehdr_t *)my_zalloc(sizeof (*au));
	if (read(fd, au, sizeof (*au)) != sizeof (*au)) {
		str_errno = STR_ERR_AU_READ_ERR;
		goto au_open_failed;
	}
	au->au_magic = BE32_TO_CPU(au->au_magic);
	au->au_offset = BE32_TO_CPU(au->au_offset);
	au->au_data_size = BE32_TO_CPU(au->au_data_size);
	au->au_encoding = BE32_TO_CPU(au->au_encoding);
	au->au_sample_rate = BE32_TO_CPU(au->au_sample_rate);
	au->au_channels = BE32_TO_CPU(au->au_channels);

	if (au->au_magic != AUDIO_AU_FILE_MAGIC) {
		str_errno = STR_ERR_AU_BAD_HEADER;
		goto au_open_failed;
	}
	if ((au->au_encoding != AUDIO_AU_ENCODING_LINEAR_16) ||
	    (au->au_sample_rate != 44100) || (au->au_channels != 2)) {

		str_errno = STR_ERR_AU_UNSUPPORTED_FORMAT;
		goto au_open_failed;
	}
	if (au->au_data_size != AUDIO_AU_UNKNOWN_SIZE) {
		if ((au->au_offset + au->au_data_size) != st.st_size) {
			str_errno = STR_ERR_AU_BAD_HEADER;
			goto au_open_failed;
		}
		data_size = au->au_data_size;
	} else {
		data_size = st.st_size - au->au_offset;
	}
	if (data_size == 0) {
		str_errno = STR_ERR_AU_UNSUPPORTED_FORMAT;
		goto au_open_failed;
	}
	if (lseek(fd, au->au_offset, SEEK_SET) < 0) {
		goto au_open_failed;
	}

	free(au);
	h = (bstreamhandle)my_zalloc(sizeof (*h));
	h->bstr_fd = fd;
	h->bstr_read = file_stream_read_wrbo;
	h->bstr_close = file_stream_close;
	h->bstr_size = audio_stream_size;
	h->bstr_rewind = au_stream_rewind;
	h->bstr_private = (void *)data_size;

	return (h);

au_open_failed:
	sav = errno;
	(void) close(fd);
	if (au != NULL)
		free(au);
	errno = sav;
	return (NULL);
}