BlobStorage::Blob BlobStorage::add(const String& path, const Data& data)
{
ASSERT(!RunLoop::isMain());
auto hash = computeSHA1(data);
if (data.isEmpty())
return { data, hash };
auto blobPath = WebCore::fileSystemRepresentation(blobPathForHash(hash));
auto linkPath = WebCore::fileSystemRepresentation(path);
unlink(linkPath.data());
bool blobExists = access(blobPath.data(), F_OK) != -1;
if (blobExists) {
auto existingData = mapFile(blobPath.data());
if (bytesEqual(existingData, data)) {
link(blobPath.data(), linkPath.data());
return { existingData, hash };
}
unlink(blobPath.data());
}
auto mappedData = data.mapToFile(blobPath.data());
if (mappedData.isNull())
return { };
link(blobPath.data(), linkPath.data());
m_approximateSize += mappedData.size();
return { mappedData, hash };
}
BlobStorage::Blob BlobStorage::add(const String& path, const Data& data)
{
ASSERT(!RunLoop::isMain());
auto hash = computeSHA1(data);
if (data.isEmpty())
return { data, hash };
auto blobPath = WebCore::fileSystemRepresentation(blobPathForHash(hash));
auto linkPath = WebCore::fileSystemRepresentation(path);
unlink(linkPath.data());
bool blobExists = access(blobPath.data(), F_OK) != -1;
if (blobExists) {
auto existingData = mapFile(blobPath.data());
if (bytesEqual(existingData, data)) {
link(blobPath.data(), linkPath.data());
return { existingData, hash };
}
unlink(blobPath.data());
}
int fd = open(blobPath.data(), O_CREAT | O_EXCL | O_RDWR , S_IRUSR | S_IWUSR);
if (fd < 0)
return { };
size_t size = data.size();
if (ftruncate(fd, size) < 0) {
close(fd);
return { };
}
void* map = mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
close(fd);
if (map == MAP_FAILED)
return { };
uint8_t* mapData = static_cast<uint8_t*>(map);
data.apply([&mapData](const uint8_t* bytes, size_t bytesSize) {
memcpy(mapData, bytes, bytesSize);
mapData += bytesSize;
return true;
});
// Drop the write permission.
mprotect(map, size, PROT_READ);
auto mappedData = Data::adoptMap(map, size);
link(blobPath.data(), linkPath.data());
m_approximateSize += size;
return { mappedData, hash };
}