Cleanup some xfa/fxfa code.

This CL moves the .h files to have names corresponding to the contained
classes. The .cpp files are moved alongside the .h files. Any extra
classes in the .h files have been split into their own files.

Change-Id: I14b4efc02417f0df946500e87b6c502e77020db8
Reviewed-on: https://pdfium-review.googlesource.com/3160
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

1 files changed, 151 insertions, 0 deletions

diff --git a/xfa/fxfa/cxfa_checksumcontext.cpp b/xfa/fxfa/cxfa_checksumcontext.cpp
new file mode 100644
index 0000000000..a59bdb16bf
--- /dev/null
+++ b/xfa/fxfa/cxfa_checksumcontext.cpp
@@ -0,0 +1,151 @@
+// Copyright 2014 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 "xfa/fxfa/cxfa_checksumcontext.h"
+
+#include "core/fdrm/crypto/fx_crypt.h"
+#include "third_party/base/ptr_util.h"
+#include "xfa/fxfa/cxfa_saxreaderhandler.h"
+
+namespace {
+
+struct FX_BASE64DATA {
+  uint32_t data1 : 2;
+  uint32_t data2 : 6;
+  uint32_t data3 : 4;
+  uint32_t data4 : 4;
+  uint32_t data5 : 6;
+  uint32_t data6 : 2;
+  uint32_t data7 : 8;
+};
+
+const char g_FXBase64EncoderMap[64] = {
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+    'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+    'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/',
+};
+
+void Base64EncodePiece(const FX_BASE64DATA& src, int32_t iBytes, char dst[4]) {
+  dst[0] = g_FXBase64EncoderMap[src.data2];
+  uint32_t b = src.data1 << 4;
+  if (iBytes > 1) {
+    b |= src.data4;
+  }
+  dst[1] = g_FXBase64EncoderMap[b];
+  if (iBytes > 1) {
+    b = src.data3 << 2;
+    if (iBytes > 2) {
+      b |= src.data6;
+    }
+    dst[2] = g_FXBase64EncoderMap[b];
+    if (iBytes > 2) {
+      dst[3] = g_FXBase64EncoderMap[src.data5];
+    } else {
+      dst[3] = '=';
+    }
+  } else {
+    dst[2] = dst[3] = '=';
+  }
+}
+
+int32_t Base64EncodeA(const uint8_t* pSrc, int32_t iSrcLen, char* pDst) {
+  ASSERT(pSrc);
+  if (iSrcLen < 1) {
+    return 0;
+  }
+  if (!pDst) {
+    int32_t iDstLen = iSrcLen / 3 * 4;
+    if ((iSrcLen % 3) != 0) {
+      iDstLen += 4;
+    }
+    return iDstLen;
+  }
+  FX_BASE64DATA srcData;
+  int32_t iBytes = 3;
+  char* pDstEnd = pDst;
+  while (iSrcLen > 0) {
+    if (iSrcLen > 2) {
+      ((uint8_t*)&srcData)[0] = *pSrc++;
+      ((uint8_t*)&srcData)[1] = *pSrc++;
+      ((uint8_t*)&srcData)[2] = *pSrc++;
+      iSrcLen -= 3;
+    } else {
+      *((uint32_t*)&srcData) = 0;
+      ((uint8_t*)&srcData)[0] = *pSrc++;
+      if (iSrcLen > 1) {
+        ((uint8_t*)&srcData)[1] = *pSrc++;
+      }
+      iBytes = iSrcLen;
+      iSrcLen = 0;
+    }
+    Base64EncodePiece(srcData, iBytes, pDstEnd);
+    pDstEnd += 4;
+  }
+  return pDstEnd - pDst;
+}
+
+}  // namespace
+
+CXFA_ChecksumContext::CXFA_ChecksumContext() {}
+
+CXFA_ChecksumContext::~CXFA_ChecksumContext() {}
+
+void CXFA_ChecksumContext::StartChecksum() {
+  FinishChecksum();
+  m_pByteContext = pdfium::MakeUnique<CRYPT_sha1_context>();
+  CRYPT_SHA1Start(m_pByteContext.get());
+  m_bsChecksum.clear();
+  m_pSAXReader = pdfium::MakeUnique<CFX_SAXReader>();
+}
+
+bool CXFA_ChecksumContext::UpdateChecksum(
+    const CFX_RetainPtr<IFX_SeekableReadStream>& pSrcFile,
+    FX_FILESIZE offset,
+    size_t size) {
+  if (!m_pSAXReader || !pSrcFile)
+    return false;
+
+  if (size < 1)
+    size = pSrcFile->GetSize();
+
+  CXFA_SAXReaderHandler handler(this);
+  m_pSAXReader->SetHandler(&handler);
+  if (m_pSAXReader->StartParse(
+          pSrcFile, (uint32_t)offset, (uint32_t)size,
+          CFX_SaxParseMode_NotSkipSpace | CFX_SaxParseMode_NotConvert_amp |
+              CFX_SaxParseMode_NotConvert_lt | CFX_SaxParseMode_NotConvert_gt |
+              CFX_SaxParseMode_NotConvert_sharp) < 0) {
+    return false;
+  }
+  return m_pSAXReader->ContinueParse(nullptr) > 99;
+}
+
+void CXFA_ChecksumContext::FinishChecksum() {
+  m_pSAXReader.reset();
+  if (m_pByteContext) {
+    uint8_t digest[20];
+    FXSYS_memset(digest, 0, 20);
+    CRYPT_SHA1Finish(m_pByteContext.get(), digest);
+    int32_t nLen = Base64EncodeA(digest, 20, nullptr);
+    char* pBuffer = m_bsChecksum.GetBuffer(nLen);
+    Base64EncodeA(digest, 20, pBuffer);
+    m_bsChecksum.ReleaseBuffer(nLen);
+    m_pByteContext.reset();
+  }
+}
+
+CFX_ByteString CXFA_ChecksumContext::GetChecksum() const {
+  return m_bsChecksum;
+}
+
+void CXFA_ChecksumContext::Update(const CFX_ByteStringC& bsText) {
+  if (!m_pByteContext)
+    return;
+
+  CRYPT_SHA1Update(m_pByteContext.get(), bsText.raw_str(), bsText.GetLength());
+}