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/*
* AUTHOR
* Stef Walter
*
* LICENSE
* This software is in the public domain.
*
* The software is provided "as is", without warranty of any kind,
* express or implied, including but not limited to the warranties
* of merchantability, fitness for a particular purpose, and
* noninfringement. In no event shall the author(s) be liable for any
* claim, damages, or other liability, whether in an action of
* contract, tort, or otherwise, arising from, out of, or in connection
* with the software or the use or other dealings in the software.
*
* SUPPORT
* Send bug reports to: <stef@memberwebs.com>
*/
#include "usuals.h"
#include "compat.h"
#include "memref.h"
#include "locks.h"
/* These locks are used to signify which */
struct drivelock
{
uint64 beg;
uint64 end;
};
void addLocationLock(drivelocks* locks, uint64 beg, uint64 end)
{
uint32 i;
if(locks->_count <= locks->_current)
{
locks->_count += 0x400;
locks->_locks = (struct drivelock*)reallocf(locks->_locks, sizeof(struct drivelock) * locks->_count);
}
/* TODO: Implement a more efficient method here! */
if(locks->_locks)
{
/* Go through and check for a current lock we can tag onto */
for(i = 0; i < locks->_current; i++)
{
if(INTERSECTS(locks->_locks[i].beg, locks->_locks[i].end, beg, end))
{
locks->_locks[i].beg = min(locks->_locks[i].beg, beg);
locks->_locks[i].end = max(locks->_locks[i].end, end);
return;
}
}
locks->_locks[locks->_current].beg = beg;
locks->_locks[locks->_current].end = end;
locks->_current++;
}
}
uint64 checkLocationLock(drivelocks* locks, uint64 sec)
{
uint64 locked;
uint32 i;
if(locks->_locks)
{
/* Go through and check for a lock */
for(i = 0; i < locks->_current; i++)
{
if(sec >= locks->_locks[i].beg &&
sec < locks->_locks[i].end)
{
locked = locks->_locks[i].end - sec;
assert(locked != 0);
return locked;
}
}
}
return 0;
}
#ifdef _DEBUG
void dumpLocationLocks(drivelocks* locks)
{
uint32 i;
for(i = 0; i < locks->_current; i++)
printf("%u\t%u\n", (uint32)locks->_locks[i].beg, (uint32)locks->_locks[i].end);
printf("\n");
}
#endif
/*
* WARNING!! Not thread safe or very efficient for large
* amounts of memory allocations
*/
#ifdef _DEBUG
const size_t kRefSig = 0x1F2F3F4F;
void* _refalloc_dbg(size_t sz)
{
/* Allocate extra counter value before memory */
size_t* mem = (size_t*)mallocf(sz * sizeof(size_t) * 2);
if(mem)
{
mem[0] = kRefSig;
mem[1] = 1;
return mem + 2;
}
return mem;
}
#endif
void* _refalloc(size_t sz)
{
/* Allocate extra counter value before memory */
size_t* mem = (size_t*)mallocf(sz * sizeof(size_t) * 1);
if(mem)
{
mem[0] = 1;
return mem + 1;
}
return mem;
}
#ifdef _DEBUG
void* _refadd_dbg(void* buf)
{
if(buf)
{
/* Increment the counter value */
size_t* mem = (size_t*)buf - 2;
assert(mem[0] == kRefSig);
mem[1]++;
}
return buf;
}
#endif
void* _refadd(void* buf)
{
if(buf)
/* Increment the counter value */
((size_t*)buf)[-1]++;
return buf;
}
#ifdef _DEBUG
void _refrelease_dbg(void* buf)
{
if(buf)
{
/* Decrement the counter value */
size_t* mem = (size_t*)buf - 2;
assert(mem[0] == kRefSig);
if(!--mem[1])
free(mem);
}
}
#endif
void _refrelease(void* buf)
{
if(buf)
{
/* Decrement the counter value */
size_t* mem = (size_t*)buf - 1;
if(!--mem[0])
free(mem);
}
}
#define COMPARE_BLOCK_SIZE 4096
int compareFileData(int f, void* data, size_t length)
{
unsigned char buf[COMPARE_BLOCK_SIZE];
unsigned char* d = (unsigned char*)data;
int num, r;
while(length > 0)
{
num = min(COMPARE_BLOCK_SIZE, length);
r = read(f, buf, num);
if(r < 0)
err(1, "error reading comparison file");
if(r < num)
return -1;
r = memcmp(d, buf, num);
if(r != 0)
return r;
d += num;
length -= num;
}
return 0;
}
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