Implement writing in SymmetricCipherStream and add a unit test.

src/streams/HashedBlockStream.cpp

@@ -19,6 +19,7 @@
 
 #include <cstring>
 
+#include "core/Endian.h"
 #include "crypto/CryptoHash.h"
 
 const QSysInfo::Endian HashedBlockStream::BYTEORDER = QSysInfo::LittleEndian;
@@ -42,10 +43,41 @@ void HashedBlockStream::init()
     m_bufferPos = 0;
     m_blockIndex = 0;
     m_eof = false;
+    m_error = false;
+}
+
+bool HashedBlockStream::reset()
+{
+    if (isWritable()) {
+        if (!m_buffer.isEmpty()) {
+            if (!writeHashedBlock()) {
+                return false;
+            }
+        }
+
+        // write empty final block
+        if (!writeHashedBlock()) {
+            return false;
+        }
+    }
+
+    init();
+    m_buffer.clear();
+
+    return true;
 }
 
 void HashedBlockStream::close()
 {
+    if (isWritable()) {
+        if (!m_buffer.isEmpty()) {
+            writeHashedBlock();
+        }
+
+        // write empty final block
+        writeHashedBlock();
+    }
+
     LayeredStream::close();
 }
 
@@ -134,12 +166,76 @@ bool HashedBlockStream::readHashedBlock()
 
 qint64 HashedBlockStream::writeData(const char* data, qint64 maxSize)
 {
-    // TODO implement
-    return 0;
+    Q_ASSERT(maxSize >= 0);
+
+    if (m_error) {
+        return 0;
+    }
+
+    qint64 bytesRemaining = maxSize;
+    qint64 offset = 0;
+
+    while (bytesRemaining > 0) {
+        int bytesToCopy = qMin(bytesRemaining, static_cast<qint64>(m_blockSize - m_buffer.size()));
+
+        m_buffer.append(data + offset, bytesToCopy);
+
+        offset += bytesToCopy;
+        bytesRemaining -= bytesToCopy;
+
+        if (m_buffer.size() == m_blockSize) {
+            if (!writeHashedBlock()) {
+                if (m_error) {
+                    return -1;
+                }
+                else {
+                    return maxSize - bytesRemaining;
+                }
+            }
+        }
+    }
+
+    return maxSize;
 }
 
 bool HashedBlockStream::writeHashedBlock()
 {
-    // TODO implement
-    return false;
+    if (!Endian::writeInt32(m_blockIndex, m_baseDevice, BYTEORDER)) {
+        // TODO error
+        Q_ASSERT(false);
+        return false;
+    }
+    m_blockIndex++;
+
+    QByteArray hash;
+    if (!m_buffer.isEmpty()) {
+        hash = CryptoHash::hash(m_buffer, CryptoHash::Sha256);
+    }
+    else {
+        hash.fill(0, 32);
+    }
+
+    if (m_baseDevice->write(hash) != hash.size()) {
+        // TODO error
+        Q_ASSERT(false);
+        return false;
+    }
+
+    if (!Endian::writeInt32(m_buffer.size(), m_baseDevice, BYTEORDER)) {
+        // TODO error
+        Q_ASSERT(false);
+        return false;
+    }
+
+    if (!m_buffer.isEmpty()) {
+        if (m_baseDevice->write(m_buffer) != m_buffer.size()) {
+            // TODO error
+            Q_ASSERT(false);
+            return false;
+        }
+
+        m_buffer.clear();
+    }
+
+    return true;
 }