Move CFX_BitStream to its own file

This CL moves the CFX_BitStream code out of fx_basic and into
cfx_bitstream.

Bug: pdfium:867
Change-Id: I5b7e6190a7db1fe1d24feb6bd676035a5c73ee92
Reviewed-on: https://pdfium-review.googlesource.com/12350
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

1 files changed, 0 insertions, 44 deletions

diff --git a/core/fxcrt/fx_basic_buffer.cpp b/core/fxcrt/fx_basic_buffer.cpp
index 310aec7faf..b93c1bc9da 100644
--- a/core/fxcrt/fx_basic_buffer.cpp
+++ b/core/fxcrt/fx_basic_buffer.cpp
@@ -145,47 +145,3 @@ CFX_WideTextBuf& CFX_WideTextBuf::operator<<(const CFX_WideTextBuf& buf) {
   AppendBlock(buf.m_pBuffer.get(), buf.m_DataSize);
   return *this;
 }
-
-void CFX_BitStream::Init(const uint8_t* pData, uint32_t dwSize) {
-  m_pData = pData;
-  m_BitSize = dwSize * 8;
-  m_BitPos = 0;
-}
-
-void CFX_BitStream::ByteAlign() {
-  m_BitPos = (m_BitPos + 7) & ~7;
-}
-
-uint32_t CFX_BitStream::GetBits(uint32_t nBits) {
-  if (nBits > m_BitSize || m_BitPos + nBits > m_BitSize)
-    return 0;
-
-  if (nBits == 1) {
-    int bit = (m_pData[m_BitPos / 8] & (1 << (7 - m_BitPos % 8))) ? 1 : 0;
-    m_BitPos++;
-    return bit;
-  }
-
-  uint32_t byte_pos = m_BitPos / 8;
-  uint32_t bit_pos = m_BitPos % 8;
-  uint32_t bit_left = nBits;
-  uint32_t result = 0;
-  if (bit_pos) {
-    if (8 - bit_pos >= bit_left) {
-      result =
-          (m_pData[byte_pos] & (0xff >> bit_pos)) >> (8 - bit_pos - bit_left);
-      m_BitPos += bit_left;
-      return result;
-    }
-    bit_left -= 8 - bit_pos;
-    result = (m_pData[byte_pos++] & ((1 << (8 - bit_pos)) - 1)) << bit_left;
-  }
-  while (bit_left >= 8) {
-    bit_left -= 8;
-    result |= m_pData[byte_pos++] << bit_left;
-  }
-  if (bit_left)
-    result |= m_pData[byte_pos] >> (8 - bit_left);
-  m_BitPos += nBits;
-  return result;
-}