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// Copyright 2017 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 "core/fpdfapi/font/cpdf_tounicodemap.h"
#include <utility>
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cpdf_cid2unicodemap.h"
#include "core/fpdfapi/page/cpdf_pagemodule.h"
#include "core/fpdfapi/parser/cpdf_simple_parser.h"
#include "core/fxcrt/fx_extension.h"
#include "core/fxcrt/fx_safe_types.h"
#include "third_party/base/numerics/safe_conversions.h"
WideString CPDF_ToUnicodeMap::Lookup(uint32_t charcode) const {
auto it = m_Map.find(charcode);
if (it != m_Map.end()) {
uint32_t value = it->second;
wchar_t unicode = (wchar_t)(value & 0xffff);
if (unicode != 0xffff) {
return unicode;
}
const wchar_t* buf = m_MultiCharBuf.GetBuffer();
uint32_t buf_len = m_MultiCharBuf.GetLength();
if (!buf || buf_len == 0) {
return WideString();
}
uint32_t index = value >> 16;
if (index >= buf_len) {
return WideString();
}
uint32_t len = buf[index];
if (index + len < index || index + len >= buf_len) {
return WideString();
}
return WideString(buf + index + 1, len);
}
if (m_pBaseMap) {
return m_pBaseMap->UnicodeFromCID((uint16_t)charcode);
}
return WideString();
}
uint32_t CPDF_ToUnicodeMap::ReverseLookup(wchar_t unicode) const {
for (const auto& pair : m_Map) {
if (pair.second == static_cast<uint32_t>(unicode))
return pair.first;
}
return 0;
}
// Static.
uint32_t CPDF_ToUnicodeMap::StringToCode(const ByteStringView& str) {
int len = str.GetLength();
if (len == 0)
return 0;
uint32_t result = 0;
if (str[0] == '<') {
for (int i = 1; i < len && std::isxdigit(str[i]); ++i)
result = result * 16 + FXSYS_HexCharToInt(str.CharAt(i));
return result;
}
for (int i = 0; i < len && std::isdigit(str[i]); ++i)
result = result * 10 + FXSYS_DecimalCharToInt(str.CharAt(i));
return result;
}
static WideString StringDataAdd(WideString str) {
WideString ret;
int len = str.GetLength();
wchar_t value = 1;
for (int i = len - 1; i >= 0; --i) {
wchar_t ch = str[i] + value;
if (ch < str[i]) {
ret.InsertAtFront(0);
} else {
ret.InsertAtFront(ch);
value = 0;
}
}
if (value)
ret.InsertAtFront(value);
return ret;
}
// Static.
WideString CPDF_ToUnicodeMap::StringToWideString(const ByteStringView& str) {
int len = str.GetLength();
if (len == 0)
return WideString();
WideString result;
if (str[0] == '<') {
int byte_pos = 0;
wchar_t ch = 0;
for (int i = 1; i < len && std::isxdigit(str[i]); ++i) {
ch = ch * 16 + FXSYS_HexCharToInt(str[i]);
byte_pos++;
if (byte_pos == 4) {
result += ch;
byte_pos = 0;
ch = 0;
}
}
return result;
}
return result;
}
CPDF_ToUnicodeMap::CPDF_ToUnicodeMap() : m_pBaseMap(nullptr) {}
CPDF_ToUnicodeMap::~CPDF_ToUnicodeMap() {}
uint32_t CPDF_ToUnicodeMap::GetUnicode() {
FX_SAFE_UINT32 uni = m_MultiCharBuf.GetLength();
uni = uni * 0x10000 + 0xffff;
return uni.ValueOrDefault(0);
}
void CPDF_ToUnicodeMap::Load(const CPDF_Stream* pStream) {
CIDSet cid_set = CIDSET_UNKNOWN;
auto pAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
pAcc->LoadAllDataFiltered();
CPDF_SimpleParser parser(pAcc->GetSpan());
while (1) {
ByteStringView word = parser.GetWord();
if (word.IsEmpty()) {
break;
}
if (word == "beginbfchar") {
while (1) {
word = parser.GetWord();
if (word.IsEmpty() || word == "endbfchar") {
break;
}
uint32_t srccode = StringToCode(word);
word = parser.GetWord();
WideString destcode = StringToWideString(word);
int len = destcode.GetLength();
if (len == 0) {
continue;
}
if (len == 1) {
m_Map[srccode] = destcode[0];
} else {
m_Map[srccode] = GetUnicode();
m_MultiCharBuf.AppendChar(destcode.GetLength());
m_MultiCharBuf << destcode;
}
}
} else if (word == "beginbfrange") {
while (1) {
ByteString low, high;
low = parser.GetWord();
if (low.IsEmpty() || low == "endbfrange") {
break;
}
high = parser.GetWord();
uint32_t lowcode = StringToCode(low.AsStringView());
uint32_t highcode =
(lowcode & 0xffffff00) | (StringToCode(high.AsStringView()) & 0xff);
if (highcode == (uint32_t)-1) {
break;
}
ByteString start(parser.GetWord());
if (start == "[") {
for (uint32_t code = lowcode; code <= highcode; code++) {
ByteString dest(parser.GetWord());
WideString destcode = StringToWideString(dest.AsStringView());
int len = destcode.GetLength();
if (len == 0) {
continue;
}
if (len == 1) {
m_Map[code] = destcode[0];
} else {
m_Map[code] = GetUnicode();
m_MultiCharBuf.AppendChar(destcode.GetLength());
m_MultiCharBuf << destcode;
}
}
parser.GetWord();
} else {
WideString destcode = StringToWideString(start.AsStringView());
int len = destcode.GetLength();
uint32_t value = 0;
if (len == 1) {
value = StringToCode(start.AsStringView());
for (uint32_t code = lowcode; code <= highcode; code++) {
m_Map[code] = value++;
}
} else {
for (uint32_t code = lowcode; code <= highcode; code++) {
WideString retcode;
if (code == lowcode) {
retcode = destcode;
} else {
retcode = StringDataAdd(destcode);
}
m_Map[code] = GetUnicode();
m_MultiCharBuf.AppendChar(retcode.GetLength());
m_MultiCharBuf << retcode;
destcode = std::move(retcode);
}
}
}
}
} else if (word == "/Adobe-Korea1-UCS2") {
cid_set = CIDSET_KOREA1;
} else if (word == "/Adobe-Japan1-UCS2") {
cid_set = CIDSET_JAPAN1;
} else if (word == "/Adobe-CNS1-UCS2") {
cid_set = CIDSET_CNS1;
} else if (word == "/Adobe-GB1-UCS2") {
cid_set = CIDSET_GB1;
}
}
if (cid_set) {
m_pBaseMap = CPDF_ModuleMgr::Get()
->GetPageModule()
->GetFontGlobals()
->GetCMapManager()
->GetCID2UnicodeMap(cid_set);
} else {
m_pBaseMap = nullptr;
}
}
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