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// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2005 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.
// =================================================================================================
#if XMP_WinBuild
#pragma warning ( disable : 4996 ) // '...' was declared deprecated
#endif
#include "MPEG2_Handler.hpp"
using namespace std;
// =================================================================================================
/// \file MPEG2_Handler.cpp
/// \brief File format handler for MPEG2.
///
/// BLECH! YUCK! GAG! MPEG-2 is done using a sidecar and recognition only by file extension! BARF!!!!!
///
// =================================================================================================
// =================================================================================================
// FindFileExtension
// =================
static inline XMP_StringPtr FindFileExtension ( XMP_StringPtr filePath )
{
XMP_StringPtr pathEnd = filePath + strlen(filePath);
XMP_StringPtr extPtr;
for ( extPtr = pathEnd-1; extPtr > filePath; --extPtr ) {
if ( (*extPtr == '.') || (*extPtr == '/') ) break;
#if XMP_WinBuild
if ( (*extPtr == '\\') || (*extPtr == ':') ) break;
#endif
}
if ( (extPtr < filePath) || (*extPtr != '.') ) return pathEnd;
return extPtr;
} // FindFileExtension
// =================================================================================================
// MPEG2_MetaHandlerCTor
// =====================
XMPFileHandler * MPEG2_MetaHandlerCTor ( XMPFiles * parent )
{
return new MPEG2_MetaHandler ( parent );
} // MPEG2_MetaHandlerCTor
// =================================================================================================
// MPEG2_CheckFormat
// =================
// The MPEG-2 handler uses just the file extension, not the file content. Worse yet, it also uses a
// sidecar file for the XMP. This works better if the handler owns the file, we open the sidecar
// instead of the actual MPEG-2 file.
bool MPEG2_CheckFormat ( XMP_FileFormat format,
XMP_StringPtr filePath,
LFA_FileRef fileRef,
XMPFiles * parent )
{
IgnoreParam(format); IgnoreParam(filePath); IgnoreParam(fileRef);
XMP_Assert ( (format == kXMP_MPEGFile) || (format == kXMP_MPEG2File) );
XMP_Assert ( fileRef == 0 );
return ( (parent->format == kXMP_MPEGFile) || (parent->format == kXMP_MPEGFile) ); // ! Just use the first call's format hint.
} // MPEG2_CheckFormat
// =================================================================================================
// MPEG2_MetaHandler::MPEG2_MetaHandler
// ====================================
MPEG2_MetaHandler::MPEG2_MetaHandler ( XMPFiles * _parent )
{
this->parent = _parent;
this->handlerFlags = kMPEG2_HandlerFlags;
this->stdCharForm = kXMP_Char8Bit;
} // MPEG2_MetaHandler::MPEG2_MetaHandler
// =================================================================================================
// MPEG2_MetaHandler::~MPEG2_MetaHandler
// =====================================
MPEG2_MetaHandler::~MPEG2_MetaHandler()
{
// Nothing to do.
} // MPEG2_MetaHandler::~MPEG2_MetaHandler
// =================================================================================================
// MPEG2_MetaHandler::CacheFileData
// ================================
void MPEG2_MetaHandler::CacheFileData()
{
bool readOnly = (! (this->parent->openFlags & kXMPFiles_OpenForUpdate));
this->containsXMP = false;
this->processedXMP = true; // Whatever we do here is all that we do for XMPFiles::OpenFile.
// Try to open the sidecar XMP file. Tolerate an open failure, there might not be any XMP.
// Note that MPEG2_CheckFormat can't save the sidecar path because the handler doesn't exist then.
XMP_StringPtr filePath = this->parent->filePath.c_str();
XMP_StringPtr extPtr = FindFileExtension ( filePath );
this->sidecarPath.assign ( filePath, (extPtr - filePath) );
this->sidecarPath += ".xmp";
if ( readOnly ) {
try { // *** At this time LFA_Open throws for a failure.
this->parent->fileRef = LFA_Open ( this->sidecarPath.c_str(), 'r' );
if ( this->parent->fileRef == 0 ) return; // *** Could someday check for a permission failure.
} catch ( ... ) {
return; // *** Could someday check for a permission failure.
}
} else {
try { // *** At this time LFA_Open throws for a failure.
this->parent->fileRef = LFA_Open ( this->sidecarPath.c_str(), 'w' );
} catch ( ... ) {
this->parent->fileRef = 0; // *** Could someday check for a permission failure.
}
if ( this->parent->fileRef == 0 ) {
// Try to create a file if it does not yet exist.
// *** Could someday check for a permission failure versus no .xmp file.
this->parent->fileRef = LFA_Create ( this->sidecarPath.c_str() );
if ( this->parent->fileRef == 0 ) XMP_Throw ( "Can't create MPEG-2 sidecar", kXMPErr_ExternalFailure );
}
}
// Extract the sidecar's contents and parse.
this->packetInfo.offset = 0; // We take the whole sidecar file.
this->packetInfo.length = (XMP_Int32) LFA_Measure ( this->parent->fileRef );
if ( this->packetInfo.length > 0 ) {
this->xmpPacket.assign ( this->packetInfo.length, ' ' );
LFA_Read ( this->parent->fileRef, (void*)this->xmpPacket.c_str(), this->packetInfo.length, kLFA_RequireAll );
if ( readOnly ) {
LFA_Close ( this->parent->fileRef );
this->parent->fileRef = 0;
}
this->xmpObj.ParseFromBuffer ( this->xmpPacket.c_str(), (XMP_StringLen)this->xmpPacket.size() );
this->containsXMP = true;
}
} // MPEG2_MetaHandler::CacheFileData
// =================================================================================================
// MPEG2_MetaHandler::UpdateFile
// =============================
void MPEG2_MetaHandler::UpdateFile ( bool doSafeUpdate )
{
if ( ! this->needsUpdate ) return;
LFA_FileRef fileRef = this->parent->fileRef;
XMP_Assert ( fileRef != 0 );
XMP_StringPtr packetStr = this->xmpPacket.c_str();
XMP_StringLen packetLen = (XMP_StringLen)this->xmpPacket.size();
if ( ! doSafeUpdate ) {
// Not doing a crash-safe update, simply rewrite the existing sidecar file.
LFA_Seek ( fileRef, 0, SEEK_SET );
LFA_Truncate ( fileRef, 0 );
LFA_Write ( fileRef, packetStr, packetLen );
} else {
// Do the usual crash-safe update dance.
LFA_FileRef tempFileRef = 0;
std::string tempFilePath;
try {
CreateTempFile ( this->sidecarPath, &tempFilePath, kCopyMacRsrc );
tempFileRef = LFA_Open ( tempFilePath.c_str(), 'w' );
LFA_Write ( tempFileRef, packetStr, packetLen );
LFA_Close ( fileRef );
this->parent->fileRef = 0;
LFA_Close ( tempFileRef );
tempFileRef = 0;
LFA_Delete ( this->sidecarPath.c_str() );
LFA_Rename ( tempFilePath.c_str(), this->sidecarPath.c_str() );
} catch ( ... ) {
if ( tempFileRef != 0 ) LFA_Close ( tempFileRef );
if ( ! tempFilePath.empty() ) LFA_Delete ( tempFilePath.c_str() );
}
}
this->needsUpdate = false;
} // MPEG2_MetaHandler::UpdateFile
// =================================================================================================
// MPEG2_MetaHandler::WriteFile
// ============================
void MPEG2_MetaHandler::WriteFile ( LFA_FileRef sourceRef,
const std::string & sourcePath )
{
IgnoreParam(sourceRef); IgnoreParam(sourcePath);
XMP_Throw ( "MPEG2_MetaHandler::WriteFile: Should never be called", kXMPErr_Unavailable );
} // MPEG2_MetaHandler::WriteFile
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