Cleanup the xfa/src/fgas directory.

This CL moves the code from xfa/src/fgas/src up one level. It then takes the
headers in xfa/src/fgas/include and moves them to their correct folder. The
src/ and include/ directories are then removed.

In some cases, when moving from include/ there was another header with the
same name. Those headers were either folded together, or the content of the
conflicting folder moved to an anonymous namespace in the cpp file as they were
not used anywhere else.

Files with duplicate names as core/src/crt were renamed to be fgas_ instead of
fx_. (e.g. fgas_system.h, fgas_memory.h, fgas_stream.h)

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1776303002 .

1 files changed, 193 insertions, 0 deletions

diff --git a/xfa/src/fgas/crt/fgas_encode.cpp b/xfa/src/fgas/crt/fgas_encode.cpp
new file mode 100644
index 0000000000..564ccf63c4
--- /dev/null
+++ b/xfa/src/fgas/crt/fgas_encode.cpp
@@ -0,0 +1,193 @@
+// 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/src/fgas/crt/fgas_codepage.h"
+
+void FX_SwapByteOrder(FX_WCHAR* pStr, int32_t iLength) {
+  FXSYS_assert(pStr != NULL);
+  if (iLength < 0) {
+    iLength = FXSYS_wcslen(pStr);
+  }
+  FX_WORD wch;
+  if (sizeof(FX_WCHAR) > 2) {
+    while (iLength-- > 0) {
+      wch = (FX_WORD)*pStr;
+      wch = (wch >> 8) | (wch << 8);
+      wch &= 0x00FF;
+      *pStr++ = wch;
+    }
+  } else {
+    while (iLength-- > 0) {
+      wch = (FX_WORD)*pStr;
+      wch = (wch >> 8) | (wch << 8);
+      *pStr++ = wch;
+    }
+  }
+}
+void FX_SwapByteOrderCopy(const FX_WCHAR* pSrc,
+                          FX_WCHAR* pDst,
+                          int32_t iLength) {
+  FXSYS_assert(pSrc != NULL && pDst != NULL);
+  if (iLength < 0) {
+    iLength = FXSYS_wcslen(pSrc);
+  }
+  FX_WORD wch;
+  if (sizeof(FX_WCHAR) > 2) {
+    while (iLength-- > 0) {
+      wch = (FX_WORD)*pSrc++;
+      wch = (wch >> 8) | (wch << 8);
+      wch &= 0x00FF;
+      *pDst++ = wch;
+    }
+  } else {
+    while (iLength-- > 0) {
+      wch = (FX_WORD)*pSrc++;
+      wch = (wch >> 8) | (wch << 8);
+      *pDst++ = wch;
+    }
+  }
+}
+void FX_UTF16ToWChar(void* pBuffer, int32_t iLength) {
+  FXSYS_assert(pBuffer != NULL && iLength > 0);
+  if (sizeof(FX_WCHAR) == 2) {
+    return;
+  }
+  FX_WORD* pSrc = (FX_WORD*)pBuffer;
+  FX_WCHAR* pDst = (FX_WCHAR*)pBuffer;
+  while (--iLength >= 0) {
+    pDst[iLength] = (FX_WCHAR)pSrc[iLength];
+  }
+}
+void FX_UTF16ToWCharCopy(const FX_WORD* pUTF16,
+                         FX_WCHAR* pWChar,
+                         int32_t iLength) {
+  FXSYS_assert(pUTF16 != NULL && pWChar != NULL && iLength > 0);
+  if (sizeof(FX_WCHAR) == 2) {
+    FXSYS_memcpy(pWChar, pUTF16, iLength * sizeof(FX_WCHAR));
+  } else {
+    while (--iLength >= 0) {
+      pWChar[iLength] = (FX_WCHAR)pUTF16[iLength];
+    }
+  }
+}
+void FX_WCharToUTF16(void* pBuffer, int32_t iLength) {
+  FXSYS_assert(pBuffer != NULL && iLength > 0);
+  if (sizeof(FX_WCHAR) == 2) {
+    return;
+  }
+  const FX_WCHAR* pSrc = (const FX_WCHAR*)pBuffer;
+  FX_WORD* pDst = (FX_WORD*)pBuffer;
+  while (--iLength >= 0) {
+    *pDst++ = (FX_WORD)*pSrc++;
+  }
+}
+void FX_WCharToUTF16Copy(const FX_WCHAR* pWChar,
+                         FX_WORD* pUTF16,
+                         int32_t iLength) {
+  FXSYS_assert(pWChar != NULL && pUTF16 != NULL && iLength > 0);
+  if (sizeof(FX_WCHAR) == 2) {
+    FXSYS_memcpy(pUTF16, pWChar, iLength * sizeof(FX_WCHAR));
+  } else {
+    while (--iLength >= 0) {
+      *pUTF16++ = (FX_WORD)*pWChar++;
+    }
+  }
+}
+inline FX_DWORD FX_DWordFromBytes(const uint8_t* pStr) {
+  return FXBSTR_ID(pStr[3], pStr[2], pStr[1], pStr[0]);
+}
+inline FX_WORD FX_WordFromBytes(const uint8_t* pStr) {
+  return (pStr[1] << 8 | pStr[0]);
+}
+int32_t FX_DecodeString(FX_WORD wCodePage,
+                        const FX_CHAR* pSrc,
+                        int32_t* pSrcLen,
+                        FX_WCHAR* pDst,
+                        int32_t* pDstLen,
+                        FX_BOOL bErrBreak) {
+  if (wCodePage == FX_CODEPAGE_UTF8) {
+    return FX_UTF8Decode(pSrc, pSrcLen, pDst, pDstLen);
+  }
+  return -1;
+}
+int32_t FX_UTF8Decode(const FX_CHAR* pSrc,
+                      int32_t* pSrcLen,
+                      FX_WCHAR* pDst,
+                      int32_t* pDstLen) {
+  if (pSrcLen == NULL || pDstLen == NULL) {
+    return -1;
+  }
+  int32_t iSrcLen = *pSrcLen;
+  if (iSrcLen < 1) {
+    *pSrcLen = *pDstLen = 0;
+    return 1;
+  }
+  int32_t iDstLen = *pDstLen;
+  FX_BOOL bValidDst = (pDst != NULL && iDstLen > 0);
+  FX_DWORD dwCode = 0;
+  int32_t iPending = 0;
+  int32_t iSrcNum = 0, iDstNum = 0;
+  int32_t k = 0;
+  int32_t iIndex = 0;
+  k = 1;
+  while (iIndex < iSrcLen) {
+    uint8_t byte = (uint8_t) * (pSrc + iIndex);
+    if (byte < 0x80) {
+      iPending = 0;
+      k = 1;
+      iDstNum++;
+      iSrcNum += k;
+      if (bValidDst) {
+        *pDst++ = byte;
+        if (iDstNum >= iDstLen) {
+          break;
+        }
+      }
+    } else if (byte < 0xc0) {
+      if (iPending < 1) {
+        break;
+      }
+      iPending--;
+      dwCode |= (byte & 0x3f) << (iPending * 6);
+      if (iPending == 0) {
+        iDstNum++;
+        iSrcNum += k;
+        if (bValidDst) {
+          *pDst++ = dwCode;
+          if (iDstNum >= iDstLen) {
+            break;
+          }
+        }
+      }
+    } else if (byte < 0xe0) {
+      iPending = 1;
+      k = 2;
+      dwCode = (byte & 0x1f) << 6;
+    } else if (byte < 0xf0) {
+      iPending = 2;
+      k = 3;
+      dwCode = (byte & 0x0f) << 12;
+    } else if (byte < 0xf8) {
+      iPending = 3;
+      k = 4;
+      dwCode = (byte & 0x07) << 18;
+    } else if (byte < 0xfc) {
+      iPending = 4;
+      k = 5;
+      dwCode = (byte & 0x03) << 24;
+    } else if (byte < 0xfe) {
+      iPending = 5;
+      k = 6;
+      dwCode = (byte & 0x01) << 30;
+    } else {
+      break;
+    }
+    iIndex++;
+  }
+  *pSrcLen = iSrcNum;
+  *pDstLen = iDstNum;
+  return 1;
+}