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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#pragma once
#include <pdf/IPDFEncryptor.hxx>
#include <vcl/pdfwriter.hxx>
namespace vcl::pdf
{
/** Writes the "Carousel" object structure (COS) to the string buffer.
*
* "Carousel" object structure (COS) is used by PDF.
*
* Structure elements like: objects, IDs, dictionaries, key/values, ...
*/
class COSWriter
{
std::shared_ptr<IPDFEncryptor> mpPDFEncryptor;
EncryptionParams maParams;
OStringBuffer maLine;
OStringBuffer& mrBuffer;
void appendLiteralString(const char* pStr, sal_Int32 nLength);
template <typename T> static void appendHex(T nValue, OStringBuffer& rBuffer)
{
static constexpr const auto constHexDigits = std::to_array<char>(
{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' });
rBuffer.append(constHexDigits[(nValue >> 4) & 15]);
rBuffer.append(constHexDigits[nValue & 15]);
}
void appendHexArray(sal_uInt8* pArray, size_t nSize)
{
for (size_t i = 0; i < nSize; i++)
appendHex(pArray[i], mrBuffer);
}
public:
COSWriter(EncryptionParams aParams = EncryptionParams(),
std::shared_ptr<IPDFEncryptor> const& pPDFEncryptor = nullptr)
: mpPDFEncryptor(pPDFEncryptor)
, maParams(aParams)
, maLine(1024)
, mrBuffer(maLine)
{
}
COSWriter(OStringBuffer& rBuffer, EncryptionParams aParams = EncryptionParams(),
std::shared_ptr<IPDFEncryptor> const& pPDFEncryptor = nullptr)
: mpPDFEncryptor(pPDFEncryptor)
, maParams(aParams)
, mrBuffer(rBuffer)
{
}
void startObject(sal_Int32 nObjectID)
{
mrBuffer.append(nObjectID);
mrBuffer.append(" 0 obj\n");
}
void endObject() { mrBuffer.append("endobj\n\n"); }
OStringBuffer& getLine() { return mrBuffer; }
void startDict() { mrBuffer.append("<<"); }
void startDictWithKey(std::string_view key)
{
mrBuffer.append(key);
mrBuffer.append("<<");
}
void endDict() { mrBuffer.append(">>\n"); }
void startStream() { mrBuffer.append("stream\n"); }
void endStream() { mrBuffer.append("\nendstream\n"); }
void write(std::string_view key, std::string_view value)
{
mrBuffer.append(key);
mrBuffer.append(value);
}
void write(std::string_view key, sal_Int32 value)
{
mrBuffer.append(key);
mrBuffer.append(" ");
mrBuffer.append(value);
}
void writeReference(sal_Int32 nObjectID)
{
mrBuffer.append(nObjectID);
mrBuffer.append(" 0 R");
}
void writeKeyAndReference(std::string_view key, sal_Int32 nObjectID)
{
mrBuffer.append(key);
mrBuffer.append(" ");
writeReference(nObjectID);
}
void writeKeyAndUnicode(std::string_view key, OUString const& rString)
{
mrBuffer.append(key);
writeUnicode(rString);
}
void writeUnicode(OUString const& rString);
void writeKeyAndUnicodeEncrypt(std::string_view key, OUString const& rString, sal_Int32 nObject)
{
mrBuffer.append(key);
writeUnicodeEncrypt(rString, nObject);
}
void writeUnicodeEncrypt(OUString const& rString, sal_Int32 nObject);
void writeLiteral(std::string_view value)
{
mrBuffer.append("(");
appendLiteralString(value.data(), value.size());
mrBuffer.append(")");
}
void writeLiteralEncrypt(std::u16string_view value, sal_Int32 nObject,
rtl_TextEncoding nEncoding = RTL_TEXTENCODING_ASCII_US);
void writeLiteralEncrypt(std::string_view value, sal_Int32 nObject);
void writeKeyAndLiteralEncrypt(std::string_view key, std::string_view value, sal_Int32 nObject)
{
mrBuffer.append(key);
writeLiteralEncrypt(value, nObject);
}
void writeHexArray(std::string_view key, sal_uInt8* pData, size_t nSize)
{
mrBuffer.append(key);
mrBuffer.append("<");
appendHexArray(pData, nSize);
mrBuffer.append(">");
}
static void appendUnicodeTextString(const OUString& rString, OStringBuffer& rBuffer);
static void appendName(std::u16string_view rString, OStringBuffer& rBuffer);
static void appendName(const char* pString, OStringBuffer& rBuffer);
};
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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