1 files changed, 92 insertions, 0 deletions
diff --git a/core/fxcrt/cfx_binarybuf.cpp b/core/fxcrt/cfx_binarybuf.cpp
new file mode 100644
index 0000000000..a1388b8d32
--- /dev/null
+++ b/core/fxcrt/cfx_binarybuf.cpp
@@ -0,0 +1,92 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "core/fxcrt/cfx_binarybuf.h"
+
+#include <algorithm>
+#include <utility>
+
+CFX_BinaryBuf::CFX_BinaryBuf()
+    : m_AllocStep(0), m_AllocSize(0), m_DataSize(0) {}
+
+CFX_BinaryBuf::CFX_BinaryBuf(FX_STRSIZE size)
+    : m_AllocStep(0), m_AllocSize(size), m_DataSize(size) {
+  m_pBuffer.reset(FX_Alloc(uint8_t, size));
+}
+
+CFX_BinaryBuf::~CFX_BinaryBuf() {}
+
+void CFX_BinaryBuf::Delete(FX_STRSIZE start_index, FX_STRSIZE count) {
+  if (!m_pBuffer || start_index < 0 || count < 0 || count > m_DataSize ||
+      start_index > m_DataSize - count) {
+    return;
+  }
+  memmove(m_pBuffer.get() + start_index, m_pBuffer.get() + start_index + count,
+          m_DataSize - start_index - count);
+  m_DataSize -= count;
+}
+
+void CFX_BinaryBuf::Clear() {
+  m_DataSize = 0;
+}
+
+std::unique_ptr<uint8_t, FxFreeDeleter> CFX_BinaryBuf::DetachBuffer() {
+  m_DataSize = 0;
+  m_AllocSize = 0;
+  return std::move(m_pBuffer);
+}
+
+void CFX_BinaryBuf::EstimateSize(FX_STRSIZE size, FX_STRSIZE step) {
+  m_AllocStep = step;
+  if (m_AllocSize < size)
+    ExpandBuf(size - m_DataSize);
+}
+
+void CFX_BinaryBuf::ExpandBuf(FX_STRSIZE add_size) {
+  FX_SAFE_STRSIZE new_size = m_DataSize;
+  new_size += add_size;
+  if (m_AllocSize >= new_size.ValueOrDie())
+    return;
+
+  int alloc_step = std::max(128, m_AllocStep ? m_AllocStep : m_AllocSize / 4);
+  new_size += alloc_step - 1;  // Quantize, don't combine these lines.
+  new_size /= alloc_step;
+  new_size *= alloc_step;
+  m_AllocSize = new_size.ValueOrDie();
+  m_pBuffer.reset(m_pBuffer
+                      ? FX_Realloc(uint8_t, m_pBuffer.release(), m_AllocSize)
+                      : FX_Alloc(uint8_t, m_AllocSize));
+}
+
+void CFX_BinaryBuf::AppendBlock(const void* pBuf, FX_STRSIZE size) {
+  if (size <= 0)
+    return;
+
+  ExpandBuf(size);
+  if (pBuf) {
+    memcpy(m_pBuffer.get() + m_DataSize, pBuf, size);
+  } else {
+    memset(m_pBuffer.get() + m_DataSize, 0, size);
+  }
+  m_DataSize += size;
+}
+
+void CFX_BinaryBuf::InsertBlock(FX_STRSIZE pos,
+                                const void* pBuf,
+                                FX_STRSIZE size) {
+  if (size <= 0)
+    return;
+
+  ExpandBuf(size);
+  memmove(m_pBuffer.get() + pos + size, m_pBuffer.get() + pos,
+          m_DataSize - pos);
+  if (pBuf) {
+    memcpy(m_pBuffer.get() + pos, pBuf, size);
+  } else {
+    memset(m_pBuffer.get() + pos, 0, size);
+  }
+  m_DataSize += size;
+}