1 files changed, 154 insertions, 0 deletions
diff --git a/comm/mailnews/import/src/nsImportScanFile.cpp b/comm/mailnews/import/src/nsImportScanFile.cpp
new file mode 100644
index 0000000000..79971ae10a
--- /dev/null
+++ b/comm/mailnews/import/src/nsImportScanFile.cpp
@@ -0,0 +1,154 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nscore.h"
+#include "nsImportScanFile.h"
+#include "ImportCharSet.h"
+
+nsImportScanFile::nsImportScanFile() {
+  m_allocated = false;
+  m_eof = false;
+  m_pBuf = nullptr;
+}
+
+nsImportScanFile::~nsImportScanFile() {
+  if (m_allocated) CleanUpScan();
+}
+
+void nsImportScanFile::InitScan(nsIInputStream* pInputStream, uint8_t* pBuf,
+                                uint32_t sz) {
+  m_pInputStream = pInputStream;
+  m_pBuf = pBuf;
+  m_bufSz = sz;
+  m_bytesInBuf = 0;
+  m_pos = 0;
+}
+
+void nsImportScanFile::CleanUpScan(void) {
+  m_pInputStream = nullptr;
+  if (m_allocated) {
+    delete[] m_pBuf;
+    m_pBuf = NULL;
+  }
+}
+
+void nsImportScanFile::ShiftBuffer(void) {
+  uint8_t* pTop;
+  uint8_t* pCurrent;
+
+  if (m_pos < m_bytesInBuf) {
+    pTop = m_pBuf;
+    pCurrent = pTop + m_pos;
+    uint32_t cnt = m_bytesInBuf - m_pos;
+    while (cnt) {
+      *pTop = *pCurrent;
+      pTop++;
+      pCurrent++;
+      cnt--;
+    }
+  }
+
+  m_bytesInBuf -= m_pos;
+  m_pos = 0;
+}
+
+bool nsImportScanFile::FillBufferFromFile(void) {
+  uint64_t available;
+  nsresult rv = m_pInputStream->Available(&available);
+  if (NS_FAILED(rv)) return false;
+
+  // Fill up a buffer and scan it
+  ShiftBuffer();
+
+  // Read in some more bytes
+  uint32_t cnt = m_bufSz - m_bytesInBuf;
+  // To distinguish from disk errors
+  // Check first for end of file?
+  // Set a done flag if true...
+  uint32_t read;
+  char* pBuf = (char*)m_pBuf;
+  pBuf += m_bytesInBuf;
+  rv = m_pInputStream->Read(pBuf, (int32_t)cnt, &read);
+
+  if (NS_FAILED(rv)) return false;
+  rv = m_pInputStream->Available(&available);
+  if (NS_FAILED(rv)) m_eof = true;
+
+  m_bytesInBuf += cnt;
+  return true;
+}
+
+bool nsImportScanFile::Scan(bool* pDone) {
+  uint64_t available;
+  nsresult rv = m_pInputStream->Available(&available);
+  if (NS_FAILED(rv)) {
+    if (m_pos < m_bytesInBuf) ScanBuffer(pDone);
+    *pDone = true;
+    return true;
+  }
+
+  // Fill up a buffer and scan it
+  if (!FillBufferFromFile()) return false;
+
+  return ScanBuffer(pDone);
+}
+
+bool nsImportScanFile::ScanBuffer(bool*) { return true; }
+
+bool nsImportScanFileLines::ScanBuffer(bool* pDone) {
+  // m_pos, m_bytesInBuf, m_eof, m_pBuf are relevant
+
+  uint32_t pos = m_pos;
+  uint32_t max = m_bytesInBuf;
+  uint8_t* pChar = m_pBuf + pos;
+  uint32_t startPos;
+
+  while (pos < max) {
+    if (m_needEol) {
+      // Find the next eol...
+      while ((pos < max) && (*pChar != ImportCharSet::cCRChar) &&
+             (*pChar != ImportCharSet::cLinefeedChar)) {
+        pos++;
+        pChar++;
+      }
+      m_pos = pos;
+      if (pos < max) m_needEol = false;
+      if (pos == max)  // need more buffer for an end of line
+        break;
+    }
+    // Skip past any eol characters
+    while ((pos < max) && ((*pChar == ImportCharSet::cCRChar) ||
+                           (*pChar == ImportCharSet::cLinefeedChar))) {
+      pos++;
+      pChar++;
+    }
+    m_pos = pos;
+    if (pos == max) break;
+    // Make sure we can find either the eof or the
+    // next end of line
+    startPos = pos;
+    while ((pos < max) && (*pChar != ImportCharSet::cCRChar) &&
+           (*pChar != ImportCharSet::cLinefeedChar)) {
+      pos++;
+      pChar++;
+    }
+
+    // Is line too big for our buffer?
+    if ((pos == max) && !m_eof) {
+      if (!m_pos) {  // line too big for our buffer
+        m_pos = pos;
+        m_needEol = true;
+      }
+      break;
+    }
+
+    if (!ProcessLine(m_pBuf + startPos, pos - startPos, pDone)) {
+      return false;
+    }
+    m_pos = pos;
+  }
+
+  return true;
+}