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// 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/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;
}
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