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Create GetMetaData for pdf

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This commit is contained in:
Svetlana Kulikova
2023-11-16 17:25:27 +03:00
parent a1e90d1904
commit f40d53c64f
6 changed files with 188 additions and 92 deletions
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165
PdfFile/PdfFile.cpp
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@ -36,6 +36,8 @@
#include "../DesktopEditor/common/File.h"
#include "../HtmlRenderer/include/HTMLRendererText.h"
#include "lib/xpdf/PDFDoc.h"
#include "lib/xpdf/Lexer.h"
#include "lib/xpdf/Parser.h"
#ifndef BUILDING_WASM_MODULE
#include "OnlineOfficeBinToPdf.h"
@ -1064,6 +1066,169 @@ void CPdfFile::ToXml(const std::wstring& sFile, bool bSaveStreams)
m_pInternal->pReader->ToXml(sFile, bSaveStreams);
}
bool CPdfFile::GetMetaData(const std::wstring& sFile, BYTE** pMetaData, DWORD& nMetaLength, std::map<std::wstring, std::wstring>& pMetaResources)
{
NSFile::CFileBinary oFile;
if (!oFile.OpenFile(sFile))
return false;
int nBufferSize = 4096;
BYTE* pBuffer = new BYTE[nBufferSize];
if (!pBuffer)
{
oFile.CloseFile();
return false;
}
DWORD nReadBytes = 0;
if (!oFile.ReadFile(pBuffer, nBufferSize, nReadBytes))
{
RELEASEARRAYOBJECTS(pBuffer);
oFile.CloseFile();
return false;
}
oFile.CloseFile();
pBuffer[nReadBytes - 1] = '\0';
char* pFirst = strstr((char*)pBuffer, "%\315\312\322\251\015");
if (!pFirst || pFirst - (char*)pBuffer + 6 >= nReadBytes)
{
RELEASEARRAYOBJECTS(pBuffer);
return false;
}
pFirst += 6;
if (strncmp(pFirst, "1 0 obj\012<<\012", 11) != 0 || pFirst - (char*)pBuffer + 11 >= nReadBytes)
{
RELEASEARRAYOBJECTS(pBuffer);
return false;
}
int nObjBegin = pFirst - (char*)pBuffer;
pFirst += 11;
pFirst = strstr(pFirst, "/Length ");
char* pStream = strstr(pFirst, "stream\015\012");
if (!pFirst || !pStream || pStream < pFirst)
{
RELEASEARRAYOBJECTS(pBuffer);
return false;
}
pFirst += 8;
pStream += 8;
int nStreamBegin = pStream - (char*)pBuffer;
char* pLast = strstr(pFirst, " ");
if (!pLast)
{
RELEASEARRAYOBJECTS(pBuffer);
return false;
}
std::string sLength = std::string(pFirst, pLast - pFirst);
int nStreamLength = std::stoi(sLength);
RELEASEARRAYOBJECTS(pBuffer);
nBufferSize = nStreamBegin + nStreamLength + 20;
pBuffer = new BYTE[nBufferSize];
if (!pBuffer)
return false;
nReadBytes = 0;
if (!oFile.OpenFile(sFile) || !oFile.ReadFile(pBuffer, nBufferSize, nReadBytes))
{
RELEASEARRAYOBJECTS(pBuffer);
oFile.CloseFile();
return false;
}
oFile.CloseFile();
Object oDictStream;
oDictStream.initNull();
BaseStream* str = new MemStream((char*)pBuffer, 0, nReadBytes, &oDictStream);
if (!str)
{
RELEASEARRAYOBJECTS(pBuffer);
return false;
}
Object oObj;
Parser* parser = new Parser(NULL, new Lexer(NULL, str->makeSubStream(str->getStart() + nObjBegin, gFalse, 0, &oObj)), gTrue);
if (!parser->getObj(&oObj, gTrue)->isInt())
{
RELEASEARRAYOBJECTS(pBuffer);
oObj.free();
return false;
}
oObj.free();
if (!parser->getObj(&oObj, gTrue)->isInt())
{
RELEASEARRAYOBJECTS(pBuffer);
oObj.free();
return false;
}
oObj.free();
if (!parser->getObj(&oObj, gTrue)->isCmd("obj"))
{
RELEASEARRAYOBJECTS(pBuffer);
oObj.free();
return false;
}
oObj.free();
if (!parser->getObj(&oObj)->isStream())
{
RELEASEARRAYOBJECTS(pBuffer);
oObj.free();
return false;
}
Stream* sData = oObj.getStream();
Dict* dict = sData->getDict();
for (int i = 0; i < dict->getLength(); ++i)
{
char* sKey = dict->getKey(i);
if (strcmp(sKey, "Length") == 0)
{
Object oLength;
dict->getVal(i, &oLength);
nMetaLength = oLength.getInt();
Stream* pImage = sData->getUndecodedStream();
pImage->reset();
*pMetaData = new BYTE[nMetaLength];
BYTE* pBufferPtr = *pMetaData;
for (int nI = 0; nI < nMetaLength; ++nI)
*pBufferPtr++ = (BYTE)pImage->getChar();
oLength.free();
}
else
{
std::wstring sName = NSFile::CUtf8Converter::GetUnicodeStringFromUTF8((BYTE*)sKey, strlen(sKey));
Object oVal;
if (dict->getVal(i, &oVal)->isString())
{
TextString* sResName = new TextString(oVal.getString());
std::wstring sStr = NSStringExt::CConverter::GetUnicodeFromUTF32(sResName->getUnicode(), sResName->getLength());
RELEASEOBJECT(sResName);
pMetaResources[sName] = sStr;
}
oVal.free();
}
}
oObj.free();
delete parser;
RELEASEARRAYOBJECTS(pBuffer);
RELEASEOBJECT(str);
return true;
}
bool CPdfFile::LoadFromFile(const std::wstring& file, const std::wstring& options, const std::wstring& owner_password, const std::wstring& user_password)
{
m_pInternal->pReader = new CPdfReader(m_pInternal->pAppFonts);