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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);
uint16_t* element = (uint16_t*)p2;
if (hiword < element[0])
return -1;
if (hiword > element[0])
return 1;
uint16_t loword = (uint16_t)key;
if (loword < element[1])
return -1;
if (loword > element[2])
return 1;
return 0;
}
static int compareDWordSingle(const void* p1, const void* p2) {
uint32_t key = *(uint32_t*)p1;
uint32_t value = ((*(uint16_t*)p2) << 16) | ((uint16_t*)p2)[1];
if (key < value)
return -1;
if (key > value)
return 1;
return 0;
}
}; // extern "C"
void FPDFAPI_FindEmbeddedCMap(const ByteString& bsName,
int charset,
int coding,
const FXCMAP_CMap*& pMap) {
pMap = nullptr;
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) {
pMap = &pCMaps[i];
break;
}
}
}
uint16_t FPDFAPI_CIDFromCharCode(const FXCMAP_CMap* pMap, uint32_t charcode) {
if (charcode >> 16) {
while (1) {
if (pMap->m_DWordMapType == FXCMAP_CMap::Range) {
uint16_t* found = static_cast<uint16_t*>(
bsearch(&charcode, pMap->m_pDWordMap, pMap->m_DWordCount, 8,
compareDWordRange));
if (found)
return found[3] + (uint16_t)charcode - found[1];
} else if (pMap->m_DWordMapType == FXCMAP_CMap::Single) {
uint16_t* found = static_cast<uint16_t*>(
bsearch(&charcode, pMap->m_pDWordMap, pMap->m_DWordCount, 6,
compareDWordSingle));
if (found)
return found[2];
}
if (pMap->m_UseOffset == 0)
return 0;
pMap = pMap + pMap->m_UseOffset;
}
return 0;
}
uint16_t code = (uint16_t)charcode;
while (1) {
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 if (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];
}
if (pMap->m_UseOffset == 0)
return 0;
pMap = pMap + pMap->m_UseOffset;
}
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.)
while (1) {
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 if (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;
}
}
if (pMap->m_UseOffset == 0)
return 0;
pMap = pMap + pMap->m_UseOffset;
}
}
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