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src/backup/data_blob.rs - DataBlobWriter: impl. compressed signed blobs

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This commit is contained in:
Dietmar Maurer 2019-08-12 09:01:08 +02:00
parent 706638f803
commit 7776becf5d
1 changed files with 38 additions and 0 deletions
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38
src/backup/data_blob.rs
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@ -344,6 +344,7 @@ enum BlobWriterState<'a, W: Write> {
Uncompressed { csum_writer: ChecksumWriter<'a, W> },
Compressed { compr: zstd::stream::write::Encoder<ChecksumWriter<'a, W>> },
Signed { csum_writer: ChecksumWriter<'a, W> },
SignedCompressed { compr: zstd::stream::write::Encoder<ChecksumWriter<'a, W>> },
}
/// Write compressed data blobs
@ -388,6 +389,21 @@ impl <'a, W: Write + Seek> DataBlobWriter<'a, W> {
Ok(Self { state: BlobWriterState::Signed { csum_writer }})
}
pub fn new_signed_compressed(mut writer: W, config: &'a CryptConfig) -> Result<Self, Error> {
writer.seek(SeekFrom::Start(0))?;
let head = AuthenticatedDataBlobHeader {
head: DataBlobHeader { magic: AUTH_COMPR_BLOB_MAGIC_1_0, crc: [0; 4] },
tag: [0u8; 32],
};
unsafe {
writer.write_le_value(head)?;
}
let signer = config.data_signer();
let csum_writer = ChecksumWriter::new(writer, Some(signer));
let compr = zstd::stream::write::Encoder::new(csum_writer, 1)?;
Ok(Self { state: BlobWriterState::SignedCompressed { compr }})
}
pub fn finish(self) -> Result<W, Error> {
match self.state {
BlobWriterState::Uncompressed { csum_writer } => {
@ -428,6 +444,22 @@ impl <'a, W: Write + Seek> DataBlobWriter<'a, W> {
writer.write_le_value(head)?;
}
return Ok(writer)
}
BlobWriterState::SignedCompressed { compr } => {
let csum_writer = compr.finish()?;
let (mut writer, crc, tag) = csum_writer.finish()?;
let head = AuthenticatedDataBlobHeader {
head: DataBlobHeader { magic: AUTH_COMPR_BLOB_MAGIC_1_0, crc: crc.to_le_bytes() },
tag: tag.unwrap(),
};
writer.seek(SeekFrom::Start(0))?;
unsafe {
writer.write_le_value(head)?;
}
return Ok(writer)
}
}
@ -447,6 +479,9 @@ impl <'a, W: Write + Seek> Write for DataBlobWriter<'a, W> {
BlobWriterState::Signed { ref mut csum_writer } => {
csum_writer.write(buf)
}
BlobWriterState::SignedCompressed { ref mut compr } => {
compr.write(buf)
}
}
}
@ -461,6 +496,9 @@ impl <'a, W: Write + Seek> Write for DataBlobWriter<'a, W> {
BlobWriterState::Signed { ref mut csum_writer } => {
csum_writer.flush()
}
BlobWriterState::SignedCompressed { ref mut compr } => {
compr.flush()
}
}
}
}