* Copyright 2001-2005, Haiku.
* Distributed under the terms of the MIT License.
*
* Authors:
* Erik Jaesler (erik@cgsoftware.com)
*/
#include <string.h>
#include <ByteOrder.h>
#include <MessageUtils.h>
namespace BPrivate {
uint32
CalculateChecksum(const uint8 *buffer, int32 size)
{
uint32 sum = 0;
uint32 temp = 0;
while (size > 3) {
sum += B_BENDIAN_TO_HOST_INT32(*(int32 *)buffer);
buffer += 4;
size -= 4;
}
while (size > 0) {
temp = (temp << 8) + *buffer++;
size -= 1;
}
return sum + temp;
}
status_t
entry_ref_flatten(char *buffer, size_t *size, const entry_ref *ref)
{
if (*size < sizeof(ref->device) + sizeof(ref->directory))
return B_BUFFER_OVERFLOW;
memcpy((void *)buffer, (const void *)&ref->device, sizeof(ref->device));
buffer += sizeof(ref->device);
memcpy((void *)buffer, (const void *)&ref->directory, sizeof(ref->directory));
buffer += sizeof(ref->directory);
*size -= sizeof(ref->device) + sizeof(ref->directory);
size_t nameLength = 0;
if (ref->name) {
nameLength = strlen(ref->name) + 1;
if (*size < nameLength)
return B_BUFFER_OVERFLOW;
memcpy((void *)buffer, (const void *)ref->name, nameLength);
}
*size = sizeof(ref->device) + sizeof(ref->directory) + nameLength;
return B_OK;
}
status_t
entry_ref_unflatten(entry_ref *ref, const char *buffer, size_t size)
{
if (size < sizeof(ref->device) + sizeof(ref->directory)) {
*ref = entry_ref();
return B_BAD_VALUE;
}
memcpy((void *)&ref->device, (const void *)buffer, sizeof(ref->device));
buffer += sizeof(ref->device);
memcpy((void *)&ref->directory, (const void *)buffer,
sizeof(ref->directory));
buffer += sizeof(ref->directory);
if (ref->device != ~(dev_t)0 && size > sizeof(ref->device)
+ sizeof(ref->directory)) {
ref->set_name(buffer);
if (ref->name == NULL) {
*ref = entry_ref();
return B_NO_MEMORY;
}
} else
ref->set_name(NULL);
return B_OK;
}
status_t
entry_ref_swap(char *buffer, size_t size)
{
if (size < sizeof(dev_t) + sizeof(ino_t))
return B_BAD_VALUE;
dev_t *dev = (dev_t *)buffer;
*dev = B_SWAP_INT32(*dev);
buffer += sizeof(dev_t);
ino_t *ino = (ino_t *)buffer;
*ino = B_SWAP_INT64(*ino);
return B_OK;
}
status_t
node_ref_flatten(char *buffer, size_t *size, const node_ref *ref)
{
if (*size < sizeof(dev_t) + sizeof(ino_t))
return B_BUFFER_OVERFLOW;
memcpy((void *)buffer, (const void *)&ref->device, sizeof(ref->device));
buffer += sizeof(ref->device);
memcpy((void *)buffer, (const void *)&ref->node, sizeof(ref->node));
buffer += sizeof(ref->node);
return B_OK;
}
status_t
node_ref_unflatten(node_ref *ref, const char *buffer, size_t size)
{
if (size < sizeof(dev_t) + sizeof(ino_t)) {
*ref = node_ref();
return B_BAD_VALUE;
}
memcpy((void *)&ref->device, (const void *)buffer, sizeof(dev_t));
buffer += sizeof(dev_t);
memcpy((void *)&ref->node, (const void *)buffer, sizeof(ino_t));
buffer += sizeof(ino_t);
return B_OK;
}
status_t
node_ref_swap(char *buffer, size_t size)
{
if (size < sizeof(dev_t) + sizeof(ino_t))
return B_BAD_VALUE;
dev_t *dev = (dev_t *)buffer;
*dev = B_SWAP_INT32(*dev);
buffer += sizeof(dev_t);
ino_t *ino = (ino_t *)buffer;
*ino = B_SWAP_INT64(*ino);
return B_OK;
}
}
