/*static*/ status_t
FSUtils::CompareFileContent(BPositionIO& content1, BPositionIO& content2,
bool& _equal)
{
// get and compare content size
off_t size1;
status_t error = content1.GetSize(&size1);
if (error != B_OK)
return error;
off_t size2;
error = content2.GetSize(&size2);
if (error != B_OK)
return error;
if (size1 != size2) {
_equal = false;
return B_OK;
}
if (size1 == 0) {
_equal = true;
return B_OK;
}
// allocate a data buffer
uint8* buffer1 = new(std::nothrow) uint8[2 * kCompareDataBufferSize];
if (buffer1 == NULL)
return B_NO_MEMORY;
ArrayDeleter<uint8> bufferDeleter(buffer1);
uint8* buffer2 = buffer1 + kCompareDataBufferSize;
// compare the data
off_t offset = 0;
while (offset < size1) {
size_t toCompare = std::min(size_t(size1 - offset),
kCompareDataBufferSize);
ssize_t bytesRead = content1.ReadAt(offset, buffer1, toCompare);
if (bytesRead < 0)
return bytesRead;
if ((size_t)bytesRead != toCompare)
return B_ERROR;
bytesRead = content2.ReadAt(offset, buffer2, toCompare);
if (bytesRead < 0)
return bytesRead;
if ((size_t)bytesRead != toCompare)
return B_ERROR;
if (memcmp(buffer1, buffer2, toCompare) != 0) {
_equal = false;
return B_OK;
}
offset += bytesRead;
}
_equal = true;
return B_OK;
}
void
TiffUintField::LoadByte(IFDEntry &entry, BPositionIO &io, swap_action swp)
{
// Make certain there is enough memory
// before trying to do anything else
fpByte = new uint8[entry.count];
if (!fpByte) {
finitStatus = B_NO_MEMORY;
return;
}
if (entry.count <= 4) {
// If all of the byte values can fit into the
// IFD entry value bytes
memcpy(fpByte, entry.bytevals, entry.count);
finitStatus = B_OK;
} else {
// entry.count > 4, use longval to find offset for byte data
if (swap_data(B_UINT32_TYPE, &entry.longval, 4, swp) != B_OK)
finitStatus = B_ERROR;
else {
ssize_t read;
read = io.ReadAt(entry.longval, fpByte, entry.count);
if (read != static_cast<ssize_t>(entry.count))
finitStatus = B_IO_ERROR;
else
finitStatus = B_OK;
}
}
}
// read_exactly
static
void
read_exactly(BPositionIO& file, off_t position, void* buffer, size_t size,
const char* errorMessage = NULL)
{
ssize_t read = file.ReadAt(position, buffer, size);
if (read < 0)
throw Exception(read, errorMessage);
else if ((size_t)read != size) {
if (errorMessage) {
throw Exception("%s Read to few bytes (%ld/%lu).", errorMessage,
read, size);
} else
throw Exception("Read to few bytes (%ld/%lu).", read, size);
}
}
void
TiffUintField::LoadShort(IFDEntry &entry, BPositionIO &io, swap_action swp)
{
// Make certain there is enough memory
// before trying to do anything else
fpShort = new uint16[entry.count];
if (!fpShort) {
finitStatus = B_NO_MEMORY;
return;
}
if (entry.count <= 2) {
// If all of the byte values can fit into the
// IFD entry value bytes
memcpy(fpShort, entry.shortvals, entry.count * 2);
finitStatus = B_OK;
} else {
// entry.count > 2, use longval to find offset for short data
if (swap_data(B_UINT32_TYPE, &entry.longval, 4, swp) != B_OK)
finitStatus = B_ERROR;
else {
ssize_t read;
read = io.ReadAt(entry.longval, fpShort, entry.count * 2);
if (read != static_cast<ssize_t>(entry.count) * 2)
finitStatus = B_IO_ERROR;
else
finitStatus = B_OK;
}
}
// If short values were successfully read in, swap them to
// the correct byte order
if (finitStatus == B_OK &&
swap_data(B_UINT16_TYPE, fpShort, entry.count * 2, swp) != B_OK)
finitStatus = B_ERROR;
}
void
TiffUintField::LoadLong(IFDEntry &entry, BPositionIO &io, swap_action swp)
{
// Make certain there is enough memory
// before trying to do anything else
fpLong = new uint32[entry.count];
if (!fpLong) {
finitStatus = B_NO_MEMORY;
return;
}
if (entry.count == 1) {
fpLong[0] = entry.longval;
finitStatus = B_OK;
} else {
// entry.count > 1, use longval to find offset for long data
if (swap_data(B_UINT32_TYPE, &entry.longval, 4, swp) != B_OK)
finitStatus = B_ERROR;
else {
ssize_t read;
read = io.ReadAt(entry.longval, fpLong, entry.count * 4);
if (read != static_cast<ssize_t>(entry.count) * 4)
finitStatus = B_IO_ERROR;
else
finitStatus = B_OK;
}
}
// If long values were successfully read in, swap them to
// the correct byte order
if (finitStatus == B_OK &&
swap_data(B_UINT32_TYPE, fpLong, entry.count * 4, swp) != B_OK)
finitStatus = B_ERROR;
}