/****************************************************************
**
** test_chksum_size_one(): Checksum 1 byte buffer
**
****************************************************************/
static void
test_chksum_size_one(void)
{
uint8_t buf[1] = {23}; /* Buffer to checksum */
uint32_t chksum; /* Checksum value */
/* Buffer w/real data */
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0x17001700, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xfa2568b7, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0xa209c931, "H5_checksum_lookup3");
/* Buffer w/zero(s) for data */
HDmemset(buf, 0, sizeof(buf));
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xfa60fb57, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0x8ba9414b, "H5_checksum_lookup3");
} /* test_chksum_size_one() */
/****************************************************************
**
** test_chksum_size_two(): Checksum 2 byte buffer
**
****************************************************************/
static void
test_chksum_size_two(void)
{
uint8_t buf[2] = {23, 187}; /* Buffer to checksum */
uint32_t chksum; /* Checksum value */
/* Buffer w/real data */
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0x17bb17bb, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xfc856608, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0x8ba7a6c9, "H5_checksum_lookup3");
/* Buffer w/zero(s) for data */
HDmemset(buf, 0, sizeof(buf));
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xfc7e9b20, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0x62cd61b3, "H5_checksum_lookup3");
} /* test_chksum_size_two() */
/****************************************************************
**
** test_chksum_large(): Checksum larger buffer
**
****************************************************************/
static void
test_chksum_large(void)
{
uint32_t chksum; /* Checksum value */
size_t u; /* Local index variable */
/* Initialize buffer w/known data */
for(u = 0; u < BUF_LEN; u++)
large_buf[u] = (uint8_t)(u * 3);
/* Buffer w/real data */
chksum = H5_checksum_fletcher32(large_buf, sizeof(large_buf));
VERIFY(chksum, 0x85b4e2a, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(large_buf, sizeof(large_buf));
VERIFY(chksum, 0xfbd0f7c0, "H5_checksum_crc");
chksum = H5_checksum_lookup3(large_buf, sizeof(large_buf), 0);
VERIFY(chksum, 0x1bd2ee7b, "H5_checksum_lookup3");
/* Buffer w/zero(s) for data */
HDmemset(large_buf, 0, sizeof(large_buf));
chksum = H5_checksum_fletcher32(large_buf, sizeof(large_buf));
VERIFY(chksum, 0, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(large_buf, sizeof(large_buf));
VERIFY(chksum, 0xfac8b4c4, "H5_checksum_crc");
chksum = H5_checksum_lookup3(large_buf, sizeof(large_buf), 0);
VERIFY(chksum, 0x930c7afc, "H5_checksum_lookup3");
} /* test_chksum_large() */
/****************************************************************
**
** test_chksum_size_four(): Checksum 4 byte buffer
**
****************************************************************/
static void
test_chksum_size_four(void)
{
uint8_t buf[4] = {23, 187, 98, 217};/* Buffer to checksum */
uint32_t chksum; /* Checksum value */
/* Buffer w/real data */
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0x924f7a94, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xff398a46, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0x2c88bb51, "H5_checksum_lookup3");
/* Buffer w/zero(s) for data */
HDmemset(buf, 0, sizeof(buf));
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xff117081, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0x049396b8, "H5_checksum_lookup3");
} /* test_chksum_size_four() */
/****************************************************************
**
** test_chksum_size_three(): Checksum 3 byte buffer
**
****************************************************************/
static void
test_chksum_size_three(void)
{
uint8_t buf[3] = {23, 187, 98}; /* Buffer to checksum */
uint32_t chksum; /* Checksum value */
/* Buffer w/real data */
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0x917679bb, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xfebc5d70, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0xcebdf4f0, "H5_checksum_lookup3");
/* Buffer w/zero(s) for data */
HDmemset(buf, 0, sizeof(buf));
chksum = H5_checksum_fletcher32(buf, sizeof(buf));
VERIFY(chksum, 0, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(buf, sizeof(buf));
VERIFY(chksum, 0xf9cc4c7a, "H5_checksum_crc");
chksum = H5_checksum_lookup3(buf, sizeof(buf), 0);
VERIFY(chksum, 0x6bd0060f, "H5_checksum_lookup3");
} /* test_chksum_size_three() */
/****************************************************************
**
** test_chksum_large(): Checksum larger buffer
**
****************************************************************/
static void
test_chksum_large(void)
{
uint8_t *large_buf; /* Buffer for checksum calculations */
uint32_t chksum; /* Checksum value */
size_t u; /* Local index variable */
/* Allocate the buffer */
large_buf = (uint8_t *)HDmalloc((size_t)BUF_LEN);
CHECK_PTR(large_buf, "HDmalloc");
/* Initialize buffer w/known data */
for(u = 0; u < BUF_LEN; u++)
large_buf[u] = (uint8_t)(u * 3);
/* Buffer w/real data */
chksum = H5_checksum_fletcher32(large_buf, (size_t)BUF_LEN);
VERIFY(chksum, 0x85b4e2a, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(large_buf, (size_t)BUF_LEN);
VERIFY(chksum, 0xfbd0f7c0, "H5_checksum_crc");
chksum = H5_checksum_lookup3(large_buf, (size_t)BUF_LEN, 0);
VERIFY(chksum, 0x1bd2ee7b, "H5_checksum_lookup3");
/* Buffer w/zero(s) for data */
HDmemset(large_buf, 0, (size_t)BUF_LEN);
chksum = H5_checksum_fletcher32(large_buf, (size_t)BUF_LEN);
VERIFY(chksum, 0, "H5_checksum_fletcher32");
chksum = H5_checksum_crc(large_buf, (size_t)BUF_LEN);
VERIFY(chksum, 0xfac8b4c4, "H5_checksum_crc");
chksum = H5_checksum_lookup3(large_buf, (size_t)BUF_LEN, 0);
VERIFY(chksum, 0x930c7afc, "H5_checksum_lookup3");
/* Release memory for buffer */
HDfree(large_buf);
} /* test_chksum_large() */
/* ARGSUSED */
static size_t
H5Z_filter_fletcher32 (unsigned flags, size_t H5_ATTR_UNUSED cd_nelmts, const unsigned H5_ATTR_UNUSED cd_values[],
size_t nbytes, size_t *buf_size, void **buf)
{
void *outbuf = NULL; /* Pointer to new buffer */
unsigned char *src = (unsigned char*)(*buf);
uint32_t fletcher; /* Checksum value */
uint32_t reversed_fletcher; /* Possible wrong checksum value */
uint8_t c[4];
uint8_t tmp;
size_t ret_value; /* Return value */
FUNC_ENTER_NOAPI(0)
HDassert(sizeof(uint32_t)>=4);
if (flags & H5Z_FLAG_REVERSE) { /* Read */
/* Do checksum if it's enabled for read; otherwise skip it
* to save performance. */
if (!(flags & H5Z_FLAG_SKIP_EDC)) {
unsigned char *tmp_src; /* Pointer to checksum in buffer */
size_t src_nbytes = nbytes; /* Original number of bytes */
uint32_t stored_fletcher; /* Stored checksum value */
/* Get the stored checksum */
src_nbytes -= FLETCHER_LEN;
tmp_src=src+src_nbytes;
UINT32DECODE(tmp_src, stored_fletcher);
/* Compute checksum (can't fail) */
fletcher = H5_checksum_fletcher32(src, src_nbytes);
/* The reversed checksum. There was a bug in the calculating code of
* the Fletcher32 checksum in the library before v1.6.3. The checksum
* value wasn't consistent between big-endian and little-endian systems.
* This bug was fixed in Release 1.6.3. However, after fixing the bug,
* the checksum value is no longer the same as before on little-endian
* system. We'll check both the correct checksum and the wrong
* checksum to be consistent with Release 1.6.2 and before.
*/
HDmemcpy(c, &fletcher, (size_t)4);
tmp = c[1];
c[1] = c[0];
c[0] = tmp;
tmp = c[3];
c[3] = c[2];
c[2] = tmp;
HDmemcpy(&reversed_fletcher, c, (size_t)4);
/* Verify computed checksum matches stored checksum */
if(stored_fletcher != fletcher && stored_fletcher != reversed_fletcher)
HGOTO_ERROR(H5E_STORAGE, H5E_READERROR, 0, "data error detected by Fletcher32 checksum")
}
/* Set return values */
/* (Re-use the input buffer, just note that the size is smaller by the size of the checksum) */
ret_value = nbytes-FLETCHER_LEN;
} else { /* Write */
