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// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2004 Adobe Systems Incorporated
// All Rights Reserved
//
// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance with the terms
// of the Adobe license agreement accompanying it.
// =================================================================================================
#include "public/include/XMP_Environment.h" // ! XMP_Environment.h must be the first included header.
#include "public/include/XMP_Const.h"
#include "public/include/XMP_IO.hpp"
#include "XMPFiles/source/XMPFiles_Impl.hpp"
#include "source/XIO.hpp"
#include "XMPFiles/source/FileHandlers/Basic_Handler.hpp"
using namespace std;
// =================================================================================================
/// \file Basic_Handler.cpp
/// \brief Base class for basic handlers that only process in-place XMP.
///
/// This header ...
///
// =================================================================================================
// =================================================================================================
// Basic_MetaHandler::~Basic_MetaHandler
// =====================================
Basic_MetaHandler::~Basic_MetaHandler()
{
// ! Inherit the base cleanup.
} // Basic_MetaHandler::~Basic_MetaHandler
// =================================================================================================
// Basic_MetaHandler::UpdateFile
// =============================
// ! This must be called from the destructor for all derived classes. It can't be called from the
// ! Basic_MetaHandler destructor, by then calls to the virtual functions would not go to the
// ! actual implementations for the derived class.
void Basic_MetaHandler::UpdateFile ( bool doSafeUpdate )
{
IgnoreParam ( doSafeUpdate );
XMP_Assert ( ! doSafeUpdate ); // Not supported at this level.
if ( ! this->needsUpdate ) return;
XMP_IO* fileRef = this->parent->ioRef;
XMP_PacketInfo & packetInfo = this->packetInfo;
std::string & xmpPacket = this->xmpPacket;
XMP_AbortProc abortProc = this->parent->abortProc;
void * abortArg = this->parent->abortArg;
const bool checkAbort = (abortProc != 0);
this->CaptureFileEnding ( fileRef ); // ! Do this first, before any location info changes.
if ( checkAbort && abortProc(abortArg) ) {
XMP_Throw ( "Basic_MetaHandler::UpdateFile - User abort", kXMPErr_UserAbort );
}
this->NoteXMPRemoval ( fileRef );
this->ShuffleTrailingContent ( fileRef );
if ( checkAbort && abortProc(abortArg) ) {
XMP_Throw ( "Basic_MetaHandler::UpdateFile - User abort", kXMPErr_UserAbort );
}
XMP_Int64 tempLength = this->xmpFileOffset - this->xmpPrefixSize + this->trailingContentSize;
fileRef->Truncate ( tempLength );
packetInfo.offset = tempLength + this->xmpPrefixSize;
this->NoteXMPInsertion ( fileRef );
fileRef->ToEOF();
this->WriteXMPPrefix ( fileRef );
fileRef->Write ( xmpPacket.c_str(), (XMP_StringLen)xmpPacket.size() );
this->WriteXMPSuffix ( fileRef );
if ( checkAbort && abortProc(abortArg) ) {
XMP_Throw ( "Basic_MetaHandler::UpdateFile - User abort", kXMPErr_UserAbort );
}
this->RestoreFileEnding ( fileRef );
this->xmpFileOffset = packetInfo.offset;
this->xmpFileSize = packetInfo.length;
this->needsUpdate = false;
} // Basic_MetaHandler::UpdateFile
// =================================================================================================
// Basic_MetaHandler::WriteTempFile
// ================================
// *** What about computing the new file length and pre-allocating the file?
void Basic_MetaHandler::WriteTempFile ( XMP_IO* tempRef )
{
XMP_AbortProc abortProc = this->parent->abortProc;
void * abortArg = this->parent->abortArg;
const bool checkAbort = (abortProc != 0);
XMP_IO* originalRef = this->parent->ioRef;
// Capture the "back" of the original file.
this->CaptureFileEnding ( originalRef );
if ( checkAbort && abortProc(abortArg) ) {
XMP_Throw ( "Basic_MetaHandler::UpdateFile - User abort", kXMPErr_UserAbort );
}
// Seek to the beginning of the original and temp files, truncate the temp.
originalRef->Rewind();
tempRef->Rewind();
tempRef->Truncate ( 0 );
// Copy the front of the original file to the temp file. Note the XMP (pseudo) removal and
// insertion. This mainly updates info about the new XMP length.
XMP_Int64 xmpSectionOffset = this->xmpFileOffset - this->xmpPrefixSize;
XMP_Int32 oldSectionLength = this->xmpPrefixSize + this->xmpFileSize + this->xmpSuffixSize;
XIO::Copy ( originalRef, tempRef, xmpSectionOffset, abortProc, abortArg );
this->NoteXMPRemoval ( originalRef );
packetInfo.offset = this->xmpFileOffset; // ! The packet offset does not change.
this->NoteXMPInsertion ( tempRef );
tempRef->ToEOF();
if ( checkAbort && abortProc(abortArg) ) {
XMP_Throw ( "Basic_MetaHandler::WriteFile - User abort", kXMPErr_UserAbort );
}
// Write the new XMP section to the temp file.
this->WriteXMPPrefix ( tempRef );
tempRef->Write ( this->xmpPacket.c_str(), (XMP_StringLen)this->xmpPacket.size() );
this->WriteXMPSuffix ( tempRef );
if ( checkAbort && abortProc(abortArg) ) {
XMP_Throw ( "Basic_MetaHandler::WriteFile - User abort", kXMPErr_UserAbort );
}
// Copy the trailing file content from the original and write the "back" of the file.
XMP_Int64 remainderOffset = xmpSectionOffset + oldSectionLength;
originalRef->Seek ( remainderOffset, kXMP_SeekFromStart );
XIO::Copy ( originalRef, tempRef, this->trailingContentSize, abortProc, abortArg );
this->RestoreFileEnding ( tempRef );
// Done.
this->xmpFileOffset = packetInfo.offset;
this->xmpFileSize = packetInfo.length;
this->needsUpdate = false;
} // Basic_MetaHandler::WriteTempFile
// =================================================================================================
// ShuffleTrailingContent
// ======================
//
// Shuffle the trailing content portion of a file forward. This does not include the final "back"
// portion of the file, just the arbitrary length content between the XMP section and the back.
// Don't use XIO::Copy, that assumes separate files and hence separate I/O positions.
// ! The XMP packet location and prefix/suffix sizes must still reflect the XMP section that is in
// ! the process of being removed.
void Basic_MetaHandler::ShuffleTrailingContent ( XMP_IO* fileRef )
{
XMP_Int64 readOffset = this->packetInfo.offset + xmpSuffixSize;
XMP_Int64 writeOffset = this->packetInfo.offset - xmpPrefixSize;
XMP_Int64 remainingLength = this->trailingContentSize;
enum { kBufferSize = 64*1024 };
char buffer [kBufferSize];
XMP_AbortProc abortProc = this->parent->abortProc;
void * abortArg = this->parent->abortArg;
const bool checkAbort = (abortProc != 0);
while ( remainingLength > 0 ) {
XMP_Int32 ioCount = kBufferSize;
if ( remainingLength < kBufferSize ) ioCount = (XMP_Int32)remainingLength;
fileRef->Seek ( readOffset, kXMP_SeekFromStart );
fileRef->ReadAll ( buffer, ioCount );
fileRef->Seek ( writeOffset, kXMP_SeekFromStart );
fileRef->Write ( buffer, ioCount );
readOffset += ioCount;
writeOffset += ioCount;
remainingLength -= ioCount;
if ( checkAbort && abortProc(abortArg) ) {
XMP_Throw ( "Basic_MetaHandler::ShuffleTrailingContent - User abort", kXMPErr_UserAbort );
}
}
} // ShuffleTrailingContent
// =================================================================================================
// Dummies needed for VS.Net
// =========================
void Basic_MetaHandler::WriteXMPPrefix ( XMP_IO* fileRef )
{
XMP_Throw ( "Basic_MetaHandler::WriteXMPPrefix - Needs specific override", kXMPErr_InternalFailure );
}
void Basic_MetaHandler::WriteXMPSuffix ( XMP_IO* fileRef )
{
XMP_Throw ( "Basic_MetaHandler::WriteXMPSuffix - Needs specific override", kXMPErr_InternalFailure );
}
void Basic_MetaHandler::NoteXMPRemoval ( XMP_IO* fileRef )
{
XMP_Throw ( "Basic_MetaHandler::NoteXMPRemoval - Needs specific override", kXMPErr_InternalFailure );
}
void Basic_MetaHandler::NoteXMPInsertion ( XMP_IO* fileRef )
{
XMP_Throw ( "Basic_MetaHandler::NoteXMPInsertion - Needs specific override", kXMPErr_InternalFailure );
}
void Basic_MetaHandler::CaptureFileEnding ( XMP_IO* fileRef )
{
XMP_Throw ( "Basic_MetaHandler::CaptureFileEnding - Needs specific override", kXMPErr_InternalFailure );
}
void Basic_MetaHandler::RestoreFileEnding ( XMP_IO* fileRef )
{
XMP_Throw ( "Basic_MetaHandler::RestoreFileEnding - Needs specific override", kXMPErr_InternalFailure );
}
// =================================================================================================
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