status_t _ExtractFileData(BDataReader* dataReader, const BPackageData& data,
int fd)
{
// create a BPackageDataReader
BPackageDataReader* reader;
status_t error = BPackageDataReaderFactory(&fBufferCache)
.CreatePackageDataReader(dataReader, data, reader);
if (error != B_OK)
return error;
ObjectDeleter<BPackageDataReader> readerDeleter(reader);
// write the data
off_t bytesRemaining = data.UncompressedSize();
off_t offset = 0;
while (bytesRemaining > 0) {
// read
size_t toCopy = std::min((off_t)fDataBufferSize, bytesRemaining);
error = reader->ReadData(offset, fDataBuffer, toCopy);
if (error != B_OK) {
fprintf(stderr, "Error: Failed to read data: %s\n",
strerror(error));
return error;
}
// write
ssize_t bytesWritten = write_pos(fd, offset, fDataBuffer, toCopy);
if (bytesWritten < 0) {
fprintf(stderr, "Error: Failed to write data: %s\n",
strerror(errno));
return errno;
}
if ((size_t)bytesWritten != toCopy) {
fprintf(stderr, "Error: Failed to write all data (%zd of "
"%zu)\n", bytesWritten, toCopy);
return B_ERROR;
}
offset += toCopy;
bytesRemaining -= toCopy;
}
return B_OK;
}
status_t Init(const BPackageData& data)
{
fOffset = data.Offset();
fCompressedSize = data.CompressedSize();
fUncompressedSize = data.UncompressedSize();
fChunkSize = data.ChunkSize();
// validate chunk size
if (fChunkSize == 0)
fChunkSize = B_HPKG_DEFAULT_DATA_CHUNK_SIZE_ZLIB;
if (fChunkSize < kMinSaneZlibChunkSize
|| fChunkSize > kMaxSaneZlibChunkSize) {
return B_BAD_DATA;
}
fChunkCount = (fUncompressedSize + (fChunkSize - 1)) / fChunkSize;
fOffsetTableSize = (fChunkCount - 1) * sizeof(uint64);
if (fOffsetTableSize >= fCompressedSize)
return B_BAD_DATA;
// allocate a buffer for the offset table
if (fChunkCount > 1) {
fOffsetTableBufferEntryCount = std::min(fChunkCount - 1,
(uint64)kMaxZlibOffsetTableBufferSize);
fOffsetTable = new(std::nothrow) uint64[
fOffsetTableBufferEntryCount];
if (fOffsetTable == NULL)
return B_NO_MEMORY;
fOffsetTableIndex = -1;
// mark the table content invalid
} else
fChunkSize = fUncompressedSize;
// mark uncompressed content invalid
fUncompressedChunk = -1;
return B_OK;
}
status_t Init(const BPackageData& data)
{
fOffset = data.Offset();
fSize = data.UncompressedSize();
return B_OK;
}
PackageDataInlineReader(const BPackageData& data)
:
BBufferDataReader(fData.InlineData(), data.UncompressedSize()),
fData(data)
{
}