/**
* Creates a file filled with zeroes
*
* @param fh the file handle
* @param size the size of the file
* @return GNUNET_OK if created ok, GNUNET_SYSERR otherwise
*/
static int
make_empty_file (const struct GNUNET_DISK_FileHandle *fh, size_t size)
{
char buffer[BUFFSIZE];
size_t bytesleft = size;
int res = 0;
if (GNUNET_DISK_handle_invalid (fh))
return GNUNET_SYSERR;
memset (buffer, 0, sizeof (buffer));
GNUNET_DISK_file_seek (fh, 0, GNUNET_DISK_SEEK_SET);
while (bytesleft > 0)
{
if (bytesleft > sizeof (buffer))
{
res = GNUNET_DISK_file_write (fh, buffer, sizeof (buffer));
if (res >= 0)
bytesleft -= res;
}
else
{
res = GNUNET_DISK_file_write (fh, buffer, bytesleft);
if (res >= 0)
bytesleft -= res;
}
if (GNUNET_SYSERR == res)
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Report result of hash computation to callback
* and free associated resources.
*/
static void
file_hash_finish (struct GNUNET_CRYPTO_FileHashContext *fhc,
const struct GNUNET_HashCode * res)
{
fhc->callback (fhc->callback_cls, res);
GNUNET_free (fhc->filename);
if (!GNUNET_DISK_handle_invalid (fhc->fh))
GNUNET_break (GNUNET_OK == GNUNET_DISK_file_close (fhc->fh));
gcry_md_close (fhc->md);
GNUNET_free (fhc); /* also frees fhc->buffer */
}
/**
* Clears a bit from bitArray if the respective usage
* counter on the disk hits/is zero.
*
* @param bitArray memory area to set the bit in
* @param bitIdx which bit to test
* @param fh A file to keep the 4bit address usage counters in
*/
static void
decrementBit (char *bitArray, unsigned int bitIdx,
const struct GNUNET_DISK_FileHandle *fh)
{
off_t fileslot;
unsigned char value;
unsigned int high;
unsigned int low;
unsigned int targetLoc;
if (GNUNET_DISK_handle_invalid (fh))
return; /* cannot decrement! */
/* Each char slot in the counter file holds two 4 bit counters */
fileslot = bitIdx / 2;
targetLoc = bitIdx % 2;
if (GNUNET_SYSERR == GNUNET_DISK_file_seek (fh, fileslot, GNUNET_DISK_SEEK_SET))
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "seek");
return;
}
if (1 != GNUNET_DISK_file_read (fh, &value, 1))
value = 0;
low = value & 0xF;
high = (value & 0xF0) >> 4;
/* decrement, but once we have reached the max, never go back! */
if (targetLoc == 0)
{
if ((low > 0) && (low < 0xF))
low--;
if (low == 0)
{
clearBit (bitArray, bitIdx);
}
}
else
{
if ((high > 0) && (high < 0xF))
high--;
if (high == 0)
{
clearBit (bitArray, bitIdx);
}
}
value = ((high << 4) | low);
if (GNUNET_SYSERR == GNUNET_DISK_file_seek (fh, fileslot, GNUNET_DISK_SEEK_SET))
{
GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "seek");
return;
}
GNUNET_assert (1 == GNUNET_DISK_file_write (fh, &value, 1));
}
static int
testOpenClose ()
{
struct GNUNET_DISK_FileHandle *fh;
uint64_t size;
fh = GNUNET_DISK_file_open (".testfile",
GNUNET_DISK_OPEN_READWRITE |
GNUNET_DISK_OPEN_CREATE,
GNUNET_DISK_PERM_USER_READ |
GNUNET_DISK_PERM_USER_WRITE);
GNUNET_assert (GNUNET_NO == GNUNET_DISK_handle_invalid (fh));
GNUNET_break (5 == GNUNET_DISK_file_write (fh, "Hello", 5));
GNUNET_DISK_file_close (fh);
GNUNET_break (GNUNET_OK ==
GNUNET_DISK_file_size (".testfile", &size, GNUNET_NO, GNUNET_YES));
if (size != 5)
return 1;
GNUNET_break (0 == UNLINK (".testfile"));
return 0;
}
/**
* Sets a bit active in the bitArray and increments
* bit-specific usage counter on disk (but only if
* the counter was below 4 bit max (==15)).
*
* @param bitArray memory area to set the bit in
* @param bitIdx which bit to test
* @param fh A file to keep the 4 bit address usage counters in
*/
static void
incrementBit (char *bitArray, unsigned int bitIdx,
const struct GNUNET_DISK_FileHandle *fh)
{
OFF_T fileSlot;
unsigned char value;
unsigned int high;
unsigned int low;
unsigned int targetLoc;
setBit (bitArray, bitIdx);
if (GNUNET_DISK_handle_invalid (fh))
return;
/* Update the counter file on disk */
fileSlot = bitIdx / 2;
targetLoc = bitIdx % 2;
GNUNET_assert (fileSlot ==
GNUNET_DISK_file_seek (fh, fileSlot, GNUNET_DISK_SEEK_SET));
if (1 != GNUNET_DISK_file_read (fh, &value, 1))
value = 0;
low = value & 0xF;
high = (value & (~0xF)) >> 4;
if (targetLoc == 0)
{
if (low < 0xF)
low++;
}
else
{
if (high < 0xF)
high++;
}
value = ((high << 4) | low);
GNUNET_assert (fileSlot ==
GNUNET_DISK_file_seek (fh, fileSlot, GNUNET_DISK_SEEK_SET));
GNUNET_assert (1 == GNUNET_DISK_file_write (fh, &value, 1));
}