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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 "core/fpdfapi/cmaps/cmap_int.h"
#include "core/fpdfapi/cpdf_modulemgr.h"
#include "core/fpdfapi/font/cpdf_fontglobals.h"
#include "core/fpdfapi/page/cpdf_pagemodule.h"
extern "C" {
static int compareWord(const void* p1, const void* p2) {
return (*(uint16_t*)p1) - (*(uint16_t*)p2);
}
static int compareWordRange(const void* key, const void* element) {
if (*(uint16_t*)key < *(uint16_t*)element)
return -1;
if (*(uint16_t*)key > ((uint16_t*)element)[1])
return 1;
return 0;
}
static int compareDWordRange(const void* p1, const void* p2) {
uint32_t key = *(uint32_t*)p1;
uint16_t hiword = (uint16_t)(key >> 16);
const auto* element = reinterpret_cast<const FXCMAP_DWordCIDMap*>(p2);
if (hiword < element->m_HiWord)
return -1;
if (hiword > element->m_HiWord)
return 1;
uint16_t loword = (uint16_t)key;
if (loword < element->m_LoWordLow)
return -1;
if (loword > element->m_LoWordHigh)
return 1;
return 0;
}
}; // extern "C"
namespace {
const FXCMAP_CMap* FindNextCMap(const FXCMAP_CMap* pMap) {
return pMap->m_UseOffset ? pMap + pMap->m_UseOffset : nullptr;
}
} // namespace
const FXCMAP_CMap* FPDFAPI_FindEmbeddedCMap(const ByteString& bsName,
int charset,
int coding) {
CPDF_FontGlobals* pFontGlobals =
CPDF_ModuleMgr::Get()->GetPageModule()->GetFontGlobals();
const FXCMAP_CMap* pCMaps;
uint32_t count;
std::tie(count, pCMaps) = pFontGlobals->GetEmbeddedCharset(charset);
for (uint32_t i = 0; i < count; i++) {
if (bsName == pCMaps[i].m_Name)
return &pCMaps[i];
}
return nullptr;
}
uint16_t FPDFAPI_CIDFromCharCode(const FXCMAP_CMap* pMap, uint32_t charcode) {
ASSERT(pMap);
if (charcode >> 16) {
while (pMap) {
if (pMap->m_pDWordMap) {
auto* found = static_cast<FXCMAP_DWordCIDMap*>(
bsearch(&charcode, pMap->m_pDWordMap, pMap->m_DWordCount,
sizeof(FXCMAP_DWordCIDMap), compareDWordRange));
if (found) {
return found->m_CID + static_cast<uint16_t>(charcode) -
found->m_LoWordLow;
}
}
pMap = FindNextCMap(pMap);
}
return 0;
}
uint16_t code = (uint16_t)charcode;
while (pMap) {
if (!pMap->m_pWordMap)
return 0;
if (pMap->m_WordMapType == FXCMAP_CMap::Single) {
uint16_t* found = static_cast<uint16_t*>(
bsearch(&code, pMap->m_pWordMap, pMap->m_WordCount, 4, compareWord));
if (found)
return found[1];
} else {
ASSERT(pMap->m_WordMapType == FXCMAP_CMap::Range);
uint16_t* found = static_cast<uint16_t*>(bsearch(
&code, pMap->m_pWordMap, pMap->m_WordCount, 6, compareWordRange));
if (found)
return found[2] + code - found[0];
}
pMap = FindNextCMap(pMap);
}
return 0;
}
uint32_t FPDFAPI_CharCodeFromCID(const FXCMAP_CMap* pMap, uint16_t cid) {
// TODO(dsinclair): This should be checking both pMap->m_WordMap and
// pMap->m_DWordMap. There was a second while() but it was never reached as
// the first always returns. Investigate and determine how this should
// really be working. (https://codereview.chromium.org/2235743003 removed the
// second while loop.)
ASSERT(pMap);
while (pMap) {
if (pMap->m_WordMapType == FXCMAP_CMap::Single) {
const uint16_t* pCur = pMap->m_pWordMap;
const uint16_t* pEnd = pMap->m_pWordMap + pMap->m_WordCount * 2;
while (pCur < pEnd) {
if (pCur[1] == cid)
return pCur[0];
pCur += 2;
}
} else {
ASSERT(pMap->m_WordMapType == FXCMAP_CMap::Range);
const uint16_t* pCur = pMap->m_pWordMap;
const uint16_t* pEnd = pMap->m_pWordMap + pMap->m_WordCount * 3;
while (pCur < pEnd) {
if (cid >= pCur[2] && cid <= pCur[2] + pCur[1] - pCur[0])
return pCur[0] + cid - pCur[2];
pCur += 3;
}
}
pMap = FindNextCMap(pMap);
}
return 0;
}
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