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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 "public/fpdf_text.h"
#include <algorithm>
#include <memory>
#include <vector>
#include "build/build_config.h"
#include "core/fpdfapi/font/cpdf_cidfont.h"
#include "core/fpdfapi/font/cpdf_font.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/page/cpdf_textobject.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/ptr_util.h"
#include "third_party/base/stl_util.h"
#if defined(OS_WIN)
#include <tchar.h>
#endif
namespace {
constexpr size_t kBytesPerCharacter = sizeof(unsigned short);
CPDF_TextPage* GetTextPageForValidIndex(FPDF_TEXTPAGE text_page, int index) {
if (!text_page || index < 0)
return nullptr;
CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(text_page);
return static_cast<size_t>(index) < textpage->size() ? textpage : nullptr;
}
} // namespace
FPDF_EXPORT FPDF_TEXTPAGE FPDF_CALLCONV FPDFText_LoadPage(FPDF_PAGE page) {
CPDF_Page* pPDFPage = CPDFPageFromFPDFPage(page);
if (!pPDFPage)
return nullptr;
CPDF_ViewerPreferences viewRef(pPDFPage->GetDocument());
CPDF_TextPage* textpage = new CPDF_TextPage(
pPDFPage, viewRef.IsDirectionR2L() ? FPDFText_Direction::Right
: FPDFText_Direction::Left);
textpage->ParseTextPage();
return FPDFTextPageFromCPDFTextPage(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) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
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) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
return 0;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
return charinfo.m_FontSize;
}
FPDF_EXPORT unsigned long FPDF_CALLCONV
FPDFText_GetFontInfo(FPDF_TEXTPAGE text_page,
int index,
void* buffer,
unsigned long buflen,
int* flags) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
return 0;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
if (!charinfo.m_pTextObj)
return 0;
RetainPtr<CPDF_Font> font = charinfo.m_pTextObj->GetFont();
if (flags)
*flags = font->GetFontFlags();
ByteString basefont = font->GetBaseFontName();
unsigned long length = basefont.GetLength() + 1;
if (buffer && buflen >= length)
memcpy(buffer, basefont.c_str(), length);
return length;
}
FPDF_EXPORT int FPDF_CALLCONV FPDFText_GetFontWeight(FPDF_TEXTPAGE text_page,
int index) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
return -1;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
if (!charinfo.m_pTextObj)
return -1;
return charinfo.m_pTextObj->GetFont()->GetFontWeight();
}
FPDF_EXPORT FPDF_TEXT_RENDERMODE FPDF_CALLCONV
FPDFText_GetTextRenderMode(FPDF_TEXTPAGE text_page, int index) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
return -1;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
if (!charinfo.m_pTextObj)
return -1;
return static_cast<FPDF_TEXT_RENDERMODE>(
charinfo.m_pTextObj->GetTextRenderMode());
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFText_GetFillColor(FPDF_TEXTPAGE text_page,
int index,
unsigned int* R,
unsigned int* G,
unsigned int* B,
unsigned int* A) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage || !R || !G || !B || !A)
return false;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
if (!charinfo.m_pTextObj)
return false;
FX_COLORREF fill_color = charinfo.m_pTextObj->m_ColorState.GetFillColorRef();
*R = FXSYS_GetRValue(fill_color);
*G = FXSYS_GetGValue(fill_color);
*B = FXSYS_GetBValue(fill_color);
*A = FXSYS_GetUnsignedAlpha(
charinfo.m_pTextObj->m_GeneralState.GetFillAlpha());
return true;
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
FPDFText_GetStrokeColor(FPDF_TEXTPAGE text_page,
int index,
unsigned int* R,
unsigned int* G,
unsigned int* B,
unsigned int* A) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage || !R || !G || !B || !A)
return false;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
if (!charinfo.m_pTextObj)
return false;
FX_COLORREF stroke_color =
charinfo.m_pTextObj->m_ColorState.GetStrokeColorRef();
*R = FXSYS_GetRValue(stroke_color);
*G = FXSYS_GetGValue(stroke_color);
*B = FXSYS_GetBValue(stroke_color);
*A = FXSYS_GetUnsignedAlpha(
charinfo.m_pTextObj->m_GeneralState.GetStrokeAlpha());
return true;
}
FPDF_EXPORT double FPDF_CALLCONV FPDFText_GetCharAngle(FPDF_TEXTPAGE text_page,
int index) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
return -1;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
// On the left is our current Matrix and on the right a generic rotation
// matrix for our coordinate space.
// | a b 0 | | cos(t) -sin(t) 0 |
// | c d 0 | | sin(t) cos(t) 0 |
// | e f 1 | | 0 0 1 |
// Calculate the angle of the vector
double angle = atan2(charinfo.m_Matrix.c, charinfo.m_Matrix.a);
if (angle < 0)
angle = 2 * FX_PI + angle;
return angle;
}
FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDFText_GetCharBox(FPDF_TEXTPAGE text_page,
int index,
double* left,
double* right,
double* bottom,
double* top) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
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_GetLooseCharBox(FPDF_TEXTPAGE text_page,
int index,
double* left,
double* right,
double* bottom,
double* top) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
return false;
FPDF_CHAR_INFO charinfo;
textpage->GetCharInfo(index, &charinfo);
if (charinfo.m_pTextObj && !IsFloatZero(charinfo.m_FontSize)) {
bool is_vert_writing = charinfo.m_pTextObj->GetFont()->IsVertWriting();
if (is_vert_writing && charinfo.m_pTextObj->GetFont()->IsCIDFont()) {
CPDF_CIDFont* pCIDFont = charinfo.m_pTextObj->GetFont()->AsCIDFont();
uint16_t cid = pCIDFont->CIDFromCharCode(charinfo.m_Charcode);
short vx;
short vy;
pCIDFont->GetVertOrigin(cid, vx, vy);
double offsetx = (vx - 500) * charinfo.m_FontSize / 1000.0;
double offsety = vy * charinfo.m_FontSize / 1000.0;
short vert_width = pCIDFont->GetVertWidth(cid);
double height = vert_width * charinfo.m_FontSize / 1000.0;
*left = charinfo.m_Origin.x + offsetx;
*right = *left + charinfo.m_FontSize;
*bottom = charinfo.m_Origin.y + offsety;
*top = *bottom + height;
return true;
}
int ascent = charinfo.m_pTextObj->GetFont()->GetTypeAscent();
int descent = charinfo.m_pTextObj->GetFont()->GetTypeDescent();
if (ascent != descent) {
float width = charinfo.m_pTextObj->GetCharWidth(charinfo.m_Charcode);
float font_scale = charinfo.m_FontSize / (ascent - descent);
*left = charinfo.m_Origin.x;
*right = charinfo.m_Origin.x + (is_vert_writing ? -width : width);
*bottom = charinfo.m_Origin.y + descent * font_scale;
*top = charinfo.m_Origin.y + ascent * font_scale;
return true;
}
}
// Fallback to the tight bounds in empty text scenarios, or bad font metrics
*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) {
CPDF_TextPage* textpage = GetTextPageForValidIndex(text_page, index);
if (!textpage)
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 start_index,
int char_count,
unsigned short* result) {
if (!page || start_index < 0 || char_count < 0 || !result)
return 0;
CPDF_TextPage* textpage = CPDFTextPageFromFPDFTextPage(page);
int char_available = textpage->CountChars() - start_index;
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(start_index, 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.ToUTF16LE();
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.ToUTF16LE();
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;
}
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::Options options;
options.bMatchCase = !!(flags & FPDF_MATCHCASE);
options.bMatchWholeWord = !!(flags & FPDF_MATCHWHOLEWORD);
options.bConsecutive = !!(flags & FPDF_CONSECUTIVE);
auto find = CPDF_TextPageFind::Create(
CPDFTextPageFromFPDFTextPage(text_page),
WideStringFromFPDFWideString(findwhat), options,
start_index >= 0 ? Optional<size_t>(start_index) : pdfium::nullopt);
// Caller takes ownership.
return FPDFSchHandleFromCPDFTextPageFind(find.release());
}
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;
// Take ownership back from caller and destroy.
std::unique_ptr<CPDF_TextPageFind> textpageFind(
CPDFTextPageFindFromFPDFSchHandle(handle));
}
// web link
FPDF_EXPORT FPDF_PAGELINK FPDF_CALLCONV
FPDFLink_LoadWebLinks(FPDF_TEXTPAGE text_page) {
if (!text_page)
return nullptr;
CPDF_TextPage* pPage = CPDFTextPageFromFPDFTextPage(text_page);
auto pageLink = pdfium::MakeUnique<CPDF_LinkExtract>(pPage);
pageLink->ExtractLinks();
// Caller takes ownership.
return FPDFPageLinkFromCPDFLinkExtract(pageLink.release());
}
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.ToUTF16LE();
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 FPDF_BOOL FPDF_CALLCONV
FPDFLink_GetTextRange(FPDF_PAGELINK link_page,
int link_index,
int* start_char_index,
int* char_count) {
if (!link_page || link_index < 0)
return false;
CPDF_LinkExtract* page_link = CPDFLinkExtractFromFPDFPageLink(link_page);
return page_link->GetTextRange(link_index, start_char_index, char_count);
}
FPDF_EXPORT void FPDF_CALLCONV FPDFLink_CloseWebLinks(FPDF_PAGELINK link_page) {
delete CPDFLinkExtractFromFPDFPageLink(link_page);
}