// 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 "public/fpdf_text.h" #include <algorithm> #include <vector> #include "core/fpdfapi/page/cpdf_page.h" #include "core/fpdfdoc/cpdf_viewerpreferences.h" #include "core/fpdftext/cpdf_linkextract.h" #include "core/fpdftext/cpdf_textpage.h" #include "core/fpdftext/cpdf_textpagefind.h" #include "fpdfsdk/cpdfsdk_helpers.h" #include "third_party/base/numerics/safe_conversions.h" #include "third_party/base/stl_util.h" #ifdef PDF_ENABLE_XFA #include "fpdfsdk/fpdfxfa/cpdfxfa_context.h" #include "fpdfsdk/fpdfxfa/cpdfxfa_page.h" #endif // PDF_ENABLE_XFA #ifdef _WIN32 #include <tchar.h> #endif namespace { constexpr size_t kBytesPerCharacter = sizeof(unsigned short); CPDF_TextPage* CPDFTextPageFromFPDFTextPage(FPDF_TEXTPAGE text_page) { return static_cast<CPDF_TextPage*>(text_page); } CPDF_TextPageFind* CPDFTextPageFindFromFPDFSchHandle(FPDF_SCHHANDLE handle) { return static_cast<CPDF_TextPageFind*>(handle); } CPDF_LinkExtract* CPDFLinkExtractFromFPDFPageLink(FPDF_PAGELINK link) { return static_cast<CPDF_LinkExtract*>(link); } } // namespace FPDF_EXPORT FPDF_TEXTPAGE FPDF_CALLCONV FPDFText_LoadPage(FPDF_PAGE page) { CPDF_Page* pPDFPage = CPDFPageFromFPDFPage(page); if (!pPDFPage) return nullptr; #ifdef PDF_ENABLE_XFA CPDFXFA_Page* pPage = UnderlyingFromFPDFPage(page); CPDFXFA_Context* pContext = pPage->GetContext(); CPDF_ViewerPreferences viewRef(pContext->GetPDFDoc()); #else // PDF_ENABLE_XFA CPDF_ViewerPreferences viewRef(pPDFPage->m_pDocument.Get()); #endif // PDF_ENABLE_XFA CPDF_TextPage* textpage = new CPDF_TextPage( pPDFPage, viewRef.IsDirectionR2L() ? FPDFText_Direction::Right : FPDFText_Direction::Left); textpage->ParseTextPage(); return textpage; } FPDF_EXPORT void FPDF_CALLCONV FPDFText_ClosePage(FPDF_TEXTPAGE text_page) { delete CPDFTextPageFromFPDFTextPage(text_page); } FPDF_EXPORT int FPDF_CALLCONV FPDFText_CountChars(FPDF_TEXTPAGE text_page) { if (!text_page) return -1; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); return textpage->CountChars(); } FPDF_EXPORT unsigned int FPDF_CALLCONV FPDFText_GetUnicode(FPDF_TEXTPAGE text_page, int index) { if (!text_page) return 0; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); if (index < 0 || index >= textpage->CountChars()) return 0; FPDF_CHAR_INFO charinfo; textpage->GetCharInfo(index, &charinfo); return charinfo.m_Unicode; } FPDF_EXPORT double FPDF_CALLCONV FPDFText_GetFontSize(FPDF_TEXTPAGE text_page, int index) { if (!text_page) return 0; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); if (index < 0 || index >= textpage->CountChars()) return 0; FPDF_CHAR_INFO charinfo; textpage->GetCharInfo(index, &charinfo); return charinfo.m_FontSize; } FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetCharBox(FPDF_TEXTPAGE text_page, int index, double* left, double* right, double* bottom, double* top) { if (!text_page || index < 0) return false; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); if (index >= textpage->CountChars()) return false; FPDF_CHAR_INFO charinfo; textpage->GetCharInfo(index, &charinfo); *left = charinfo.m_CharBox.left; *right = charinfo.m_CharBox.right; *bottom = charinfo.m_CharBox.bottom; *top = charinfo.m_CharBox.top; return true; } FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetCharOrigin(FPDF_TEXTPAGE text_page, int index, double* x, double* y) { if (!text_page) return false; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); if (index < 0 || index >= textpage->CountChars()) return false; FPDF_CHAR_INFO charinfo; textpage->GetCharInfo(index, &charinfo); *x = charinfo.m_Origin.x; *y = charinfo.m_Origin.y; return true; } // select FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetCharIndexAtPos(FPDF_TEXTPAGE text_page, double x, double y, double xTolerance, double yTolerance) { if (!text_page) return -3; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); return textpage->GetIndexAtPos( CFX_PointF(static_cast<float>(x), static_cast<float>(y)), CFX_SizeF(static_cast<float>(xTolerance), static_cast<float>(yTolerance))); } FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetText(FPDF_TEXTPAGE page, int char_start, int char_count, unsigned short* result) { if (!page || char_start < 0 || char_count < 0 || !result) return 0; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(page); int char_available = textpage->CountChars() - char_start; if (char_available <= 0) return 0; char_count = std::min(char_count, char_available); if (char_count == 0) { // Writing out "", which has a character count of 1 due to the NUL. *result = '\0'; return 1; } WideString str = textpage->GetPageText(char_start, char_count); if (str.GetLength() > static_cast<size_t>(char_count)) str = str.Left(static_cast<size_t>(char_count)); // UFT16LE_Encode doesn't handle surrogate pairs properly, so it is expected // the number of items to stay the same. ByteString byte_str = str.UTF16LE_Encode(); size_t byte_str_len = byte_str.GetLength(); int ret_count = byte_str_len / kBytesPerCharacter; ASSERT(ret_count <= char_count + 1); // +1 to account for the NUL terminator. memcpy(result, byte_str.c_str(), byte_str_len); return ret_count; } FPDF_EXPORT int FPDF_CALLCONV FPDFText_CountRects(FPDF_TEXTPAGE text_page, int start, int count) { if (!text_page) return 0; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); return textpage->CountRects(start, count); } FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetRect(FPDF_TEXTPAGE text_page, int rect_index, double* left, double* top, double* right, double* bottom) { if (!text_page) return false; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); CFX_FloatRect rect; bool result = textpage->GetRect(rect_index, &rect); *left = rect.left; *top = rect.top; *right = rect.right; *bottom = rect.bottom; return result; } FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetBoundedText(FPDF_TEXTPAGE text_page, double left, double top, double right, double bottom, unsigned short* buffer, int buflen) { if (!text_page) return 0; CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page); CFX_FloatRect rect((float)left, (float)bottom, (float)right, (float)top); WideString str = textpage->GetTextByRect(rect); if (buflen <= 0 || !buffer) return str.GetLength(); ByteString cbUTF16Str = str.UTF16LE_Encode(); int len = cbUTF16Str.GetLength() / sizeof(unsigned short); int size = buflen > len ? len : buflen; memcpy(buffer, cbUTF16Str.c_str(), size * sizeof(unsigned short)); cbUTF16Str.ReleaseBuffer(size * sizeof(unsigned short)); return size; } // Search // -1 for end FPDF_EXPORT FPDF_SCHHANDLE FPDF_CALLCONV FPDFText_FindStart(FPDF_TEXTPAGE text_page, FPDF_WIDESTRING findwhat, unsigned long flags, int start_index) { if (!text_page) return nullptr; CPDF_TextPageFind* textpageFind = new CPDF_TextPageFind(CPDFTextPageFromFPDFTextPage(text_page)); size_t len = WideString::WStringLength(findwhat); textpageFind->FindFirst( WideString::FromUTF16LE(findwhat, len), flags, start_index >= 0 ? Optional<size_t>(start_index) : Optional<size_t>()); return textpageFind; } FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_FindNext(FPDF_SCHHANDLE handle) { if (!handle) return false; CPDF_TextPageFind* textpageFind = CPDFTextPageFindFromFPDFSchHandle(handle); return textpageFind->FindNext(); } FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_FindPrev(FPDF_SCHHANDLE handle) { if (!handle) return false; CPDF_TextPageFind* textpageFind = CPDFTextPageFindFromFPDFSchHandle(handle); return textpageFind->FindPrev(); } FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetSchResultIndex(FPDF_SCHHANDLE handle) { if (!handle) return 0; CPDF_TextPageFind* textpageFind = CPDFTextPageFindFromFPDFSchHandle(handle); return textpageFind->GetCurOrder(); } FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetSchCount(FPDF_SCHHANDLE handle) { if (!handle) return 0; CPDF_TextPageFind* textpageFind = CPDFTextPageFindFromFPDFSchHandle(handle); return textpageFind->GetMatchedCount(); } FPDF_EXPORT void FPDF_CALLCONV FPDFText_FindClose(FPDF_SCHHANDLE handle) { if (!handle) return; CPDF_TextPageFind* textpageFind = CPDFTextPageFindFromFPDFSchHandle(handle); delete textpageFind; handle = nullptr; } // web link FPDF_EXPORT FPDF_PAGELINK FPDF_CALLCONV FPDFLink_LoadWebLinks(FPDF_TEXTPAGE text_page) { if (!text_page) return nullptr; CPDF_LinkExtract* pageLink = new CPDF_LinkExtract(CPDFTextPageFromFPDFTextPage(text_page)); pageLink->ExtractLinks(); return pageLink; } FPDF_EXPORT int FPDF_CALLCONV FPDFLink_CountWebLinks(FPDF_PAGELINK link_page) { if (!link_page) return 0; CPDF_LinkExtract* pageLink = CPDFLinkExtractFromFPDFPageLink(link_page); return pdfium::base::checked_cast<int>(pageLink->CountLinks()); } FPDF_EXPORT int FPDF_CALLCONV FPDFLink_GetURL(FPDF_PAGELINK link_page, int link_index, unsigned short* buffer, int buflen) { WideString wsUrl(L""); if (link_page && link_index >= 0) { CPDF_LinkExtract* pageLink = CPDFLinkExtractFromFPDFPageLink(link_page); wsUrl = pageLink->GetURL(link_index); } ByteString cbUTF16URL = wsUrl.UTF16LE_Encode(); int required = cbUTF16URL.GetLength() / sizeof(unsigned short); if (!buffer || buflen <= 0) return required; int size = std::min(required, buflen); if (size > 0) { int buf_size = size * sizeof(unsigned short); memcpy(buffer, cbUTF16URL.c_str(), buf_size); } return size; } FPDF_EXPORT int FPDF_CALLCONV FPDFLink_CountRects(FPDF_PAGELINK link_page, int link_index) { if (!link_page || link_index < 0) return 0; CPDF_LinkExtract* pageLink = CPDFLinkExtractFromFPDFPageLink(link_page); return pdfium::CollectionSize<int>(pageLink->GetRects(link_index)); } FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFLink_GetRect(FPDF_PAGELINK link_page, int link_index, int rect_index, double* left, double* top, double* right, double* bottom) { if (!link_page || link_index < 0 || rect_index < 0) return false; CPDF_LinkExtract* pageLink = CPDFLinkExtractFromFPDFPageLink(link_page); std::vector<CFX_FloatRect> rectArray = pageLink->GetRects(link_index); if (rect_index >= pdfium::CollectionSize<int>(rectArray)) return false; *left = rectArray[rect_index].left; *right = rectArray[rect_index].right; *top = rectArray[rect_index].top; *bottom = rectArray[rect_index].bottom; return true; } FPDF_EXPORT void FPDF_CALLCONV FPDFLink_CloseWebLinks(FPDF_PAGELINK link_page) { delete CPDFLinkExtractFromFPDFPageLink(link_page); }