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src/backup/data_blob.rs: avoid excessive stack usage

This commit is contained in:
Dietmar Maurer 2019-08-14 12:43:36 +02:00
parent c638542b4b
commit e27c5a559f
1 changed files with 4 additions and 4 deletions
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8
src/backup/data_blob.rs
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@ -382,7 +382,7 @@ impl <R: BufRead> Read for CryptReader<R> {
struct CryptWriter<W> { struct CryptWriter<W> {
writer: W, writer: W,
block_size: usize, block_size: usize,
encr_buf: [u8; 64*1024], encr_buf: Box<[u8; 64*1024]>,
iv: [u8; 16], iv: [u8; 16],
crypter: openssl::symm::Crypter, crypter: openssl::symm::Crypter,
} }
@ -396,11 +396,11 @@ impl <W: Write> CryptWriter<W> {
let crypter = config.data_crypter(&iv, openssl::symm::Mode::Encrypt)?; let crypter = config.data_crypter(&iv, openssl::symm::Mode::Encrypt)?;
Ok(Self { writer, iv, crypter, block_size, encr_buf: [0u8; 64*1024] }) Ok(Self { writer, iv, crypter, block_size, encr_buf: Box::new([0u8; 64*1024]) })
} }
fn finish(mut self) -> Result<(W, [u8; 16], [u8; 16]), Error> { fn finish(mut self) -> Result<(W, [u8; 16], [u8; 16]), Error> {
let rest = self.crypter.finalize(&mut self.encr_buf)?; let rest = self.crypter.finalize(self.encr_buf.as_mut())?;
if rest > 0 { if rest > 0 {
self.writer.write_all(&self.encr_buf[..rest])?; self.writer.write_all(&self.encr_buf[..rest])?;
} }
@ -421,7 +421,7 @@ impl <W: Write> Write for CryptWriter<W> {
if write_size > (self.encr_buf.len() - self.block_size) { if write_size > (self.encr_buf.len() - self.block_size) {
write_size = self.encr_buf.len() - self.block_size; write_size = self.encr_buf.len() - self.block_size;
} }
let count = self.crypter.update(&buf[..write_size], &mut self.encr_buf) let count = self.crypter.update(&buf[..write_size], self.encr_buf.as_mut())
.map_err(|err| { .map_err(|err| {
std::io::Error::new( std::io::Error::new(
std::io::ErrorKind::Other, std::io::ErrorKind::Other,