// Copyright 2017 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include <map>
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#include <memory>
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#include <utility>
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#include <vector>
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#include "core/fpdfapi/cpdf_modulemgr.h"
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#include "core/fpdfapi/font/cpdf_font.h"
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#include "core/fpdfapi/font/cpdf_type1font.h"
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#include "core/fpdfapi/page/cpdf_docpagedata.h"
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#include "core/fpdfapi/page/cpdf_textobject.h"
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#include "core/fpdfapi/parser/cpdf_array.h"
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#include "core/fpdfapi/parser/cpdf_dictionary.h"
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#include "core/fpdfapi/parser/cpdf_document.h"
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#include "core/fpdfapi/parser/cpdf_name.h"
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#include "core/fpdfapi/parser/cpdf_number.h"
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#include "core/fpdfapi/parser/cpdf_reference.h"
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#include "core/fpdfapi/parser/cpdf_stream.h"
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#include "core/fxcrt/fx_extension.h"
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#include "core/fxge/cfx_fontmgr.h"
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#include "core/fxge/fx_font.h"
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#include "fpdfsdk/fsdk_define.h"
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#include "public/fpdf_edit.h"
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namespace {
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CPDF_Dictionary* LoadFontDesc(CPDF_Document* pDoc,
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const ByteString& font_name,
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CFX_Font* pFont,
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const uint8_t* data,
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uint32_t size,
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int font_type) {
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CPDF_Dictionary* fontDesc = pDoc->NewIndirect<CPDF_Dictionary>();
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fontDesc->SetNewFor<CPDF_Name>("Type", "FontDescriptor");
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fontDesc->SetNewFor<CPDF_Name>("FontName", font_name);
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int flags = 0;
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if (FXFT_Is_Face_fixedwidth(pFont->GetFace()))
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flags |= FXFONT_FIXED_PITCH;
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if (font_name.Contains("Serif"))
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flags |= FXFONT_SERIF;
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if (FXFT_Is_Face_Italic(pFont->GetFace()))
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flags |= FXFONT_ITALIC;
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if (FXFT_Is_Face_Bold(pFont->GetFace()))
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flags |= FXFONT_BOLD;
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// TODO(npm): How do I know if a font is symbolic, script, allcap, smallcap
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flags |= FXFONT_NONSYMBOLIC;
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fontDesc->SetNewFor<CPDF_Number>("Flags", flags);
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FX_RECT bbox;
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pFont->GetBBox(bbox);
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auto pBBox = pdfium::MakeUnique<CPDF_Array>();
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pBBox->AddNew<CPDF_Number>(bbox.left);
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pBBox->AddNew<CPDF_Number>(bbox.top);
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pBBox->AddNew<CPDF_Number>(bbox.right);
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pBBox->AddNew<CPDF_Number>(bbox.bottom);
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fontDesc->SetFor("FontBBox", std::move(pBBox));
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// TODO(npm): calculate italic angle correctly
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fontDesc->SetNewFor<CPDF_Number>("ItalicAngle", pFont->IsItalic() ? -12 : 0);
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fontDesc->SetNewFor<CPDF_Number>("Ascent", pFont->GetAscent());
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fontDesc->SetNewFor<CPDF_Number>("Descent", pFont->GetDescent());
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// TODO(npm): calculate the capheight, stemV correctly
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fontDesc->SetNewFor<CPDF_Number>("CapHeight", pFont->GetAscent());
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fontDesc->SetNewFor<CPDF_Number>("StemV", pFont->IsBold() ? 120 : 70);
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CPDF_Stream* pStream = pDoc->NewIndirect<CPDF_Stream>();
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pStream->SetData(data, size);
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// TODO(npm): Lengths for Type1 fonts.
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if (font_type == FPDF_FONT_TRUETYPE) {
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pStream->GetDict()->SetNewFor<CPDF_Number>("Length1",
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static_cast<int>(size));
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}
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ByteString fontFile = font_type == FPDF_FONT_TYPE1 ? "FontFile" : "FontFile2";
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fontDesc->SetNewFor<CPDF_Reference>(fontFile, pDoc, pStream->GetObjNum());
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return fontDesc;
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}
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const char ToUnicodeStart[] =
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"/CIDInit /ProcSet findresource begin\n"
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"12 dict begin\n"
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"begincmap\n"
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"/CIDSystemInfo\n"
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"<</Registry (Adobe)\n"
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"/Ordering (Identity)\n"
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"/Supplement 0\n"
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">> def\n"
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"/CMapName /Adobe-Identity-H def\n"
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"CMapType 2 def\n"
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"1 begincodespacerange\n"
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"<0000> <FFFFF>\n"
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"endcodespacerange\n";
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const char ToUnicodeEnd[] =
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"endcmap\n"
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"CMapName currentdict /CMap defineresource pop\n"
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"end\n"
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"end\n";
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void AddCharcode(std::ostringstream* pBuffer, uint32_t number) {
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ASSERT(number <= 0xFFFF);
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*pBuffer << "<";
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char ans[4];
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FXSYS_IntToFourHexChars(number, ans);
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for (size_t i = 0; i < 4; ++i)
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*pBuffer << ans[i];
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*pBuffer << ">";
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}
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// PDF spec 1.7 Section 5.9.2: "Unicode character sequences as expressed in
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// UTF-16BE encoding." See https://en.wikipedia.org/wiki/UTF-16#Description
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void AddUnicode(std::ostringstream* pBuffer, uint32_t unicode) {
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if (unicode >= 0xD800 && unicode <= 0xDFFF)
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unicode = 0;
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char ans[8];
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*pBuffer << "<";
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size_t numChars = FXSYS_ToUTF16BE(unicode, ans);
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for (size_t i = 0; i < numChars; ++i)
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*pBuffer << ans[i];
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*pBuffer << ">";
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}
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// Loads the charcode to unicode mapping into a stream
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CPDF_Stream* LoadUnicode(CPDF_Document* pDoc,
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const std::map<uint32_t, uint32_t>& to_unicode) {
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// A map charcode->unicode
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std::map<uint32_t, uint32_t> char_to_uni;
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// A map <char_start, char_end> to vector v of unicode characters of size (end
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// - start + 1). This abbreviates: start->v[0], start+1->v[1], etc. PDF spec
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// 1.7 Section 5.9.2 says that only the last byte of the unicode may change.
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std::map<std::pair<uint32_t, uint32_t>, std::vector<uint32_t>>
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map_range_vector;
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// A map <start, end> -> unicode
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// This abbreviates: start->unicode, start+1->unicode+1, etc.
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// PDF spec 1.7 Section 5.9.2 says that only the last byte of the unicode may
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// change.
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std::map<std::pair<uint32_t, uint32_t>, uint32_t> map_range;
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// Calculate the maps
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for (auto iter = to_unicode.begin(); iter != to_unicode.end(); ++iter) {
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uint32_t firstCharcode = iter->first;
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uint32_t firstUnicode = iter->second;
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if (std::next(iter) == to_unicode.end() ||
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firstCharcode + 1 != std::next(iter)->first) {
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char_to_uni[firstCharcode] = firstUnicode;
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continue;
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}
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++iter;
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uint32_t curCharcode = iter->first;
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uint32_t curUnicode = iter->second;
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if (curCharcode % 256 == 0) {
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char_to_uni[firstCharcode] = firstUnicode;
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char_to_uni[curCharcode] = curUnicode;
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continue;
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}
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const size_t maxExtra = 255 - (curCharcode % 256);
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auto next_it = std::next(iter);
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if (firstUnicode + 1 != curUnicode) {
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// Consecutive charcodes mapping to non-consecutive unicodes
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std::vector<uint32_t> unicodes;
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unicodes.push_back(firstUnicode);
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unicodes.push_back(curUnicode);
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for (size_t i = 0; i < maxExtra; ++i) {
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if (next_it == to_unicode.end() || curCharcode + 1 != next_it->first)
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break;
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++iter;
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++curCharcode;
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unicodes.push_back(iter->second);
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next_it = std::next(iter);
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}
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ASSERT(iter->first - firstCharcode + 1 == unicodes.size());
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map_range_vector[std::make_pair(firstCharcode, iter->first)] = unicodes;
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continue;
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}
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// Consecutive charcodes mapping to consecutive unicodes
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for (size_t i = 0; i < maxExtra; ++i) {
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if (next_it == to_unicode.end() || curCharcode + 1 != next_it->first ||
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curUnicode + 1 != next_it->second) {
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break;
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}
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++iter;
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++curCharcode;
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++curUnicode;
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next_it = std::next(iter);
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}
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map_range[std::make_pair(firstCharcode, curCharcode)] = firstUnicode;
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}
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std::ostringstream buffer;
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buffer << ToUnicodeStart;
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// Add maps to buffer
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buffer << static_cast<uint32_t>(char_to_uni.size()) << " beginbfchar\n";
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for (const auto& iter : char_to_uni) {
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AddCharcode(&buffer, iter.first);
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buffer << " ";
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AddUnicode(&buffer, iter.second);
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buffer << "\n";
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}
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buffer << "endbfchar\n"
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<< static_cast<uint32_t>(map_range_vector.size() + map_range.size())
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<< " beginbfrange\n";
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for (const auto& iter : map_range_vector) {
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const std::pair<uint32_t, uint32_t>& charcodeRange = iter.first;
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AddCharcode(&buffer, charcodeRange.first);
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buffer << " ";
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AddCharcode(&buffer, charcodeRange.second);
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buffer << " [";
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const std::vector<uint32_t>& unicodes = iter.second;
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for (size_t i = 0; i < unicodes.size(); ++i) {
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uint32_t uni = unicodes[i];
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AddUnicode(&buffer, uni);
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if (i != unicodes.size() - 1)
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buffer << " ";
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}
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buffer << "]\n";
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}
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for (const auto& iter : map_range) {
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const std::pair<uint32_t, uint32_t>& charcodeRange = iter.first;
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AddCharcode(&buffer, charcodeRange.first);
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buffer << " ";
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AddCharcode(&buffer, charcodeRange.second);
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buffer << " ";
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AddUnicode(&buffer, iter.second);
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buffer << "\n";
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}
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buffer << "endbfrange\n";
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buffer << ToUnicodeEnd;
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// TODO(npm): Encrypt / Compress?
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CPDF_Stream* stream = pDoc->NewIndirect<CPDF_Stream>();
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stream->SetData(&buffer);
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return stream;
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}
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const uint32_t kMaxSimpleFontChar = 0xFF;
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void* LoadSimpleFont(CPDF_Document* pDoc,
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std::unique_ptr<CFX_Font> pFont,
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const uint8_t* data,
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uint32_t size,
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int font_type) {
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CPDF_Dictionary* fontDict = pDoc->NewIndirect<CPDF_Dictionary>();
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fontDict->SetNewFor<CPDF_Name>("Type", "Font");
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fontDict->SetNewFor<CPDF_Name>(
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"Subtype", font_type == FPDF_FONT_TYPE1 ? "Type1" : "TrueType");
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ByteString name = pFont->GetFaceName();
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if (name.IsEmpty())
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name = "Unnamed";
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fontDict->SetNewFor<CPDF_Name>("BaseFont", name);
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uint32_t glyphIndex;
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uint32_t currentChar = FXFT_Get_First_Char(pFont->GetFace(), &glyphIndex);
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if (currentChar > kMaxSimpleFontChar || glyphIndex == 0)
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return nullptr;
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fontDict->SetNewFor<CPDF_Number>("FirstChar", static_cast<int>(currentChar));
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CPDF_Array* widthsArray = pDoc->NewIndirect<CPDF_Array>();
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while (true) {
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widthsArray->AddNew<CPDF_Number>(pFont->GetGlyphWidth(glyphIndex));
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uint32_t nextChar =
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FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
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// Simple fonts have 1-byte charcodes only.
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if (nextChar > kMaxSimpleFontChar || glyphIndex == 0)
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break;
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for (uint32_t i = currentChar + 1; i < nextChar; i++)
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widthsArray->AddNew<CPDF_Number>(0);
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currentChar = nextChar;
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}
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fontDict->SetNewFor<CPDF_Number>("LastChar", static_cast<int>(currentChar));
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fontDict->SetNewFor<CPDF_Reference>("Widths", pDoc, widthsArray->GetObjNum());
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CPDF_Dictionary* fontDesc =
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LoadFontDesc(pDoc, name, pFont.get(), data, size, font_type);
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fontDict->SetNewFor<CPDF_Reference>("FontDescriptor", pDoc,
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fontDesc->GetObjNum());
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return pDoc->LoadFont(fontDict);
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}
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const uint32_t kMaxUnicode = 0x10FFFF;
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void* LoadCompositeFont(CPDF_Document* pDoc,
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std::unique_ptr<CFX_Font> pFont,
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const uint8_t* data,
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uint32_t size,
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int font_type) {
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CPDF_Dictionary* fontDict = pDoc->NewIndirect<CPDF_Dictionary>();
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fontDict->SetNewFor<CPDF_Name>("Type", "Font");
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fontDict->SetNewFor<CPDF_Name>("Subtype", "Type0");
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// TODO(npm): Get the correct encoding, if it's not identity.
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ByteString encoding = "Identity-H";
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fontDict->SetNewFor<CPDF_Name>("Encoding", encoding);
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ByteString name = pFont->GetFaceName();
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if (name.IsEmpty())
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name = "Unnamed";
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fontDict->SetNewFor<CPDF_Name>(
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"BaseFont", font_type == FPDF_FONT_TYPE1 ? name + "-" + encoding : name);
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CPDF_Dictionary* pCIDFont = pDoc->NewIndirect<CPDF_Dictionary>();
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pCIDFont->SetNewFor<CPDF_Name>("Type", "Font");
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pCIDFont->SetNewFor<CPDF_Name>("Subtype", font_type == FPDF_FONT_TYPE1
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? "CIDFontType0"
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: "CIDFontType2");
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pCIDFont->SetNewFor<CPDF_Name>("BaseFont", name);
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// TODO(npm): Maybe use FT_Get_CID_Registry_Ordering_Supplement to get the
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// CIDSystemInfo
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CPDF_Dictionary* pCIDSystemInfo = pDoc->NewIndirect<CPDF_Dictionary>();
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pCIDSystemInfo->SetNewFor<CPDF_Name>("Registry", "Adobe");
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pCIDSystemInfo->SetNewFor<CPDF_Name>("Ordering", "Identity");
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pCIDSystemInfo->SetNewFor<CPDF_Number>("Supplement", 0);
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pCIDFont->SetNewFor<CPDF_Reference>("CIDSystemInfo", pDoc,
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pCIDSystemInfo->GetObjNum());
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CPDF_Dictionary* fontDesc =
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LoadFontDesc(pDoc, name, pFont.get(), data, size, font_type);
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pCIDFont->SetNewFor<CPDF_Reference>("FontDescriptor", pDoc,
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fontDesc->GetObjNum());
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uint32_t glyphIndex;
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uint32_t currentChar = FXFT_Get_First_Char(pFont->GetFace(), &glyphIndex);
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// If it doesn't have a single char, just fail
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if (glyphIndex == 0 || currentChar > kMaxUnicode)
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return nullptr;
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std::map<uint32_t, uint32_t> to_unicode;
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std::map<uint32_t, uint32_t> widths;
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while (true) {
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if (currentChar > kMaxUnicode)
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break;
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widths[glyphIndex] = pFont->GetGlyphWidth(glyphIndex);
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to_unicode[glyphIndex] = currentChar;
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currentChar =
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FXFT_Get_Next_Char(pFont->GetFace(), currentChar, &glyphIndex);
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if (glyphIndex == 0)
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break;
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}
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CPDF_Array* widthsArray = pDoc->NewIndirect<CPDF_Array>();
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for (auto it = widths.begin(); it != widths.end(); ++it) {
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int ch = it->first;
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int w = it->second;
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if (std::next(it) == widths.end()) {
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// Only one char left, use format c [w]
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auto oneW = pdfium::MakeUnique<CPDF_Array>();
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oneW->AddNew<CPDF_Number>(w);
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widthsArray->AddNew<CPDF_Number>(ch);
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widthsArray->Add(std::move(oneW));
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break;
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}
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++it;
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int next_ch = it->first;
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int next_w = it->second;
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if (next_ch == ch + 1 && next_w == w) {
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// The array can have a group c_first c_last w: all CIDs in the range from
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// c_first to c_last will have width w
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widthsArray->AddNew<CPDF_Number>(ch);
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ch = next_ch;
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while (true) {
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auto next_it = std::next(it);
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if (next_it == widths.end() || next_it->first != it->first + 1 ||
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next_it->second != it->second) {
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break;
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}
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++it;
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ch = it->first;
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}
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widthsArray->AddNew<CPDF_Number>(ch);
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widthsArray->AddNew<CPDF_Number>(w);
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continue;
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}
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// Otherwise we can have a group of the form c [w1 w2 ...]: c has width
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// w1, c+1 has width w2, etc.
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widthsArray->AddNew<CPDF_Number>(ch);
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auto curWidthArray = pdfium::MakeUnique<CPDF_Array>();
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curWidthArray->AddNew<CPDF_Number>(w);
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curWidthArray->AddNew<CPDF_Number>(next_w);
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while (true) {
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auto next_it = std::next(it);
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if (next_it == widths.end() || next_it->first != it->first + 1)
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break;
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++it;
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curWidthArray->AddNew<CPDF_Number>(static_cast<int>(it->second));
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}
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widthsArray->Add(std::move(curWidthArray));
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}
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pCIDFont->SetNewFor<CPDF_Reference>("W", pDoc, widthsArray->GetObjNum());
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// TODO(npm): Support vertical writing
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auto pDescendant = pdfium::MakeUnique<CPDF_Array>();
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pDescendant->AddNew<CPDF_Reference>(pDoc, pCIDFont->GetObjNum());
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fontDict->SetFor("DescendantFonts", std::move(pDescendant));
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CPDF_Stream* toUnicodeStream = LoadUnicode(pDoc, to_unicode);
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fontDict->SetNewFor<CPDF_Reference>("ToUnicode", pDoc,
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toUnicodeStream->GetObjNum());
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return pDoc->LoadFont(fontDict);
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}
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} // namespace
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FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
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FPDFPageObj_NewTextObj(FPDF_DOCUMENT document,
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FPDF_BYTESTRING font,
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float font_size) {
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CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
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if (!pDoc)
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return nullptr;
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CPDF_Font* pFont = CPDF_Font::GetStockFont(pDoc, ByteStringView(font));
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if (!pFont)
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return nullptr;
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auto pTextObj = pdfium::MakeUnique<CPDF_TextObject>();
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pTextObj->m_TextState.SetFont(pFont);
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pTextObj->m_TextState.SetFontSize(font_size);
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pTextObj->DefaultStates();
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return pTextObj.release(); // Caller takes ownership.
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}
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
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FPDFText_SetText(FPDF_PAGEOBJECT text_object, FPDF_WIDESTRING text) {
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auto* pTextObj = static_cast<CPDF_TextObject*>(text_object);
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if (!pTextObj)
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return false;
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size_t len = WideString::WStringLength(text);
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WideString encodedText = WideString::FromUTF16LE(text, len);
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ByteString byteText;
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for (wchar_t wc : encodedText) {
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pTextObj->GetFont()->AppendChar(
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&byteText, pTextObj->GetFont()->CharCodeFromUnicode(wc));
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}
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pTextObj->SetText(byteText);
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return true;
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}
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FPDF_EXPORT FPDF_FONT FPDF_CALLCONV FPDFText_LoadFont(FPDF_DOCUMENT document,
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const uint8_t* data,
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uint32_t size,
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int font_type,
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FPDF_BOOL cid) {
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CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
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if (!pDoc || !data || size == 0 ||
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(font_type != FPDF_FONT_TYPE1 && font_type != FPDF_FONT_TRUETYPE)) {
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return nullptr;
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}
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auto pFont = pdfium::MakeUnique<CFX_Font>();
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// TODO(npm): Maybe use FT_Get_X11_Font_Format to check format? Otherwise, we
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// are allowing giving any font that can be loaded on freetype and setting it
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// as any font type.
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if (!pFont->LoadEmbedded(data, size))
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return nullptr;
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return cid ? LoadCompositeFont(pDoc, std::move(pFont), data, size, font_type)
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: LoadSimpleFont(pDoc, std::move(pFont), data, size, font_type);
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}
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FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV
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FPDFText_SetFillColor(FPDF_PAGEOBJECT text_object,
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unsigned int R,
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unsigned int G,
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unsigned int B,
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unsigned int A) {
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return FPDFPageObj_SetFillColor(text_object, R, G, B, A);
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}
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FPDF_EXPORT void FPDF_CALLCONV FPDFFont_Close(FPDF_FONT font) {
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CPDF_Font* pFont = static_cast<CPDF_Font*>(font);
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if (!pFont)
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return;
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CPDF_Document* pDoc = pFont->GetDocument();
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if (!pDoc)
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return;
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CPDF_DocPageData* pPageData = pDoc->GetPageData();
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if (!pPageData->IsForceClear())
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pPageData->ReleaseFont(pFont->GetFontDict());
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}
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FPDF_EXPORT FPDF_PAGEOBJECT FPDF_CALLCONV
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FPDFPageObj_CreateTextObj(FPDF_DOCUMENT document,
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FPDF_FONT font,
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float font_size) {
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CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
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CPDF_Font* pFont = static_cast<CPDF_Font*>(font);
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if (!pDoc || !pFont)
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return nullptr;
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auto pTextObj = pdfium::MakeUnique<CPDF_TextObject>();
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pTextObj->m_TextState.SetFont(pDoc->LoadFont(pFont->GetFontDict()));
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pTextObj->m_TextState.SetFontSize(font_size);
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pTextObj->DefaultStates();
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return pTextObj.release();
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}
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