bool WriteChunk ( LFA_FileRef inFileRef, long tagID, const char * data, UInt32 len )
{
atag ck;
ck.id = MakeUns32LE ( tagID );
ck.len = MakeUns32LE ( len );
try {
LFA_Write ( inFileRef, &ck, 8 );
LFA_Write ( inFileRef, data, len );
} catch ( ... ) {
return false;
}
return true;
}
bool MarkChunkAsPadding ( LFA_FileRef inFileRef, RiffState & inOutRiffState, long riffType, long tagID, long subtypeID )
{
UInt32 len;
UInt64 pos;
atag tag;
try {
bool found = FindChunk ( inOutRiffState, tagID, riffType, subtypeID, NULL, &len, &pos );
if ( ! found ) return false;
if ( subtypeID != 0 ) {
pos -= 12;
} else {
pos -= 8;
}
tag.id = MakeUns32LE ( ckidPremierePadding );
LFA_Seek ( inFileRef, pos, SEEK_SET );
LFA_Write ( inFileRef, &tag, 4 );
pos += 8;
AddTag ( inOutRiffState, ckidPremierePadding, len, pos, 0, 0, 0 );
} catch(...) {
return false; // If a write fails, it throws, so we return false.
}
return true;
}
bool WriteFileAttrFlags ( LFA_FileRef fileRef, const TagData& fileAttrTag, XMP_Uns32 flags )
{
try {
XMP_Uns32 bitMask = MakeUns32LE ( flags );
LFA_Seek ( fileRef, fileAttrTag.pos + fileAttrTag.offset, SEEK_SET );
LFA_Write ( fileRef, &bitMask, 4 );
return true;
} catch ( ... ) {}
return false;
} // WriteFileAttrFlags
bool ASF_Support::WriteHeaderExtensionObject ( const std::string& buffer, std::string* header, const ASF_ObjectBase& _objectBase, const int /*reservePadding*/ )
{
if ( ! IsEqualGUID ( ASF_Header_Extension_Object, _objectBase.guid ) || (! header) || (buffer.size() < 46) ) return false;
const XMP_Uns64 offset = 46;
int startPos = header->size();
// copy header base
header->append ( buffer, 0, offset );
// read extended header-object structure beginning at the data part (offset = 46)
XMP_Uns64 read = 0;
XMP_Uns64 data = (_objectBase.size - offset);
XMP_Uns64 pos = offset;
ASF_ObjectBase objectBase;
while ( read < data ) {
memcpy ( &objectBase, &buffer[int(pos)], kASF_ObjectBaseLen );
objectBase.size = GetUns64LE ( &objectBase.size );
if ( IsEqualGUID ( ASF_Padding_Object, objectBase.guid ) ) {
// eliminate
} else {
// copy other objects
header->append ( buffer, XMP_Uns32(pos), XMP_Uns32(objectBase.size) );
}
pos += objectBase.size;
read += objectBase.size;
}
// update header extension data size
XMP_Uns32 valueUns32LE = MakeUns32LE ( header->size() - startPos - offset );
std::string newDataSize ( (const char*)&valueUns32LE, 4 );
ReplaceString ( *header, newDataSize, (startPos + 42), 4 );
// update new object size
XMP_Uns64 valueUns64LE = MakeUns64LE ( header->size() - startPos );
std::string newObjectSize ( (const char*)&valueUns64LE, 8 );
ReplaceString ( *header, newObjectSize, (startPos + 16), 8 );
return true;
}
bool WriteXMPTag ( LFA_FileRef fileRef, XMP_Uns32 len, const char* inBuffer )
{
bool ret = false;
XMP_Uns16 code = MakeUns16LE ( (SWF_TAG_ID_METADATA << 6) | 0x3F );
XMP_Uns32 length = MakeUns32LE ( len );
try {
LFA_Write (fileRef, &code, 2 );
LFA_Write (fileRef, &length, 4 );
LFA_Write (fileRef, inBuffer, len );
ret = true;
} catch ( ... ) {}
return ret;
} // WriteXMPTag
bool PutChunk ( LFA_FileRef inFileRef, RiffState & inOutRiffState, long riffType, long tagID, const char * inBuffer, UInt32 inBufferSize )
{
UInt32 len;
UInt64 pos;
atag tag;
// Make sure we're writting an even number of bytes. Required by the RIFF specification.
XMP_Assert ( (inBufferSize & 1) == 0 );
try {
bool found = FindChunk ( inOutRiffState, tagID, 0, 0, NULL, &len, &pos );
if ( found ) {
if ( len == inBufferSize ) {
LFA_Seek ( inFileRef, pos, SEEK_SET );
LFA_Write ( inFileRef, inBuffer, inBufferSize );
return true;
}
pos -= 8;
tag.id = MakeUns32LE ( ckidPremierePadding );
LFA_Seek ( inFileRef, pos, SEEK_SET );
LFA_Write ( inFileRef, &tag, 4 );
if ( len > inBufferSize ) {
pos += 8;
AddTag ( inOutRiffState, ckidPremierePadding, len, pos, 0, 0, 0 );
}
}
} catch ( ... ) {
// If a write fails, it throws, so we return false
return false;
}
bool ok = MakeChunk ( inFileRef, inOutRiffState, riffType, (inBufferSize + 8) );
if ( ! ok ) return false;
return WriteChunk ( inFileRef, tagID, inBuffer, inBufferSize );
}
bool UpdateHeader ( LFA_FileRef fileRef )
{
try {
XMP_Int64 length64 = LFA_Measure ( fileRef );
if ( (length64 < 8) || (length64 > (XMP_Int64)0xFFFFFFFFULL) ) return false;
XMP_Uns32 length32 = MakeUns32LE ( (XMP_Uns32)length64 );
LFA_Seek ( fileRef, 4, SEEK_SET );
LFA_Write ( fileRef, &length32, 4 );
return true;
} catch ( ... ) {}
return false;
} // UpdateHeader
typedef struct _GUID
{
XMP_Uns32 Data1;
XMP_Uns16 Data2;
XMP_Uns16 Data3;
XMP_Uns8 Data4[8];
} GUID;
int IsEqualGUID ( const GUID& guid1, const GUID& guid2 );
static const GUID GUID_NULL = { 0x0, 0x0, 0x0, { 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0 } };
#endif
// header object
static const GUID ASF_Header_Object = { MakeUns32LE(0x75b22630), MakeUns16LE(0x668e), MakeUns16LE(0x11cf), { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c } };
// contains ...
static const GUID ASF_File_Properties_Object = { MakeUns32LE(0x8cabdca1), MakeUns16LE(0xa947), MakeUns16LE(0x11cf), { 0x8e, 0xe4, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 } };
static const GUID ASF_Content_Description_Object = { MakeUns32LE(0x75b22633), MakeUns16LE(0x668e), MakeUns16LE(0x11cf), { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c } };
static const GUID ASF_Content_Branding_Object = { MakeUns32LE(0x2211b3fa), MakeUns16LE(0xbd23), MakeUns16LE(0x11d2), { 0xb4, 0xb7, 0x00, 0xa0, 0xc9, 0x55, 0xfc, 0x6e } };
static const GUID ASF_Content_Encryption_Object = { MakeUns32LE(0x2211b3fb), MakeUns16LE(0xbd23), MakeUns16LE(0x11d2), { 0xb4, 0xb7, 0x00, 0xa0, 0xc9, 0x55, 0xfc, 0x6e } };
// padding
// Remark: regarding to Microsofts spec only the ASF_Header_Object contains a ASF_Padding_Object
// Real world files show, that the ASF_Header_Extension_Object contains a ASF_Padding_Object
static const GUID ASF_Header_Extension_Object = { MakeUns32LE(0x5fbf03b5), MakeUns16LE(0xa92e), MakeUns16LE(0x11cf), { 0x8e, 0xe3, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 } };
static const GUID ASF_Padding_Object = { MakeUns32LE(0x1806d474), MakeUns16LE(0xcadf), MakeUns16LE(0x4509), { 0xa4, 0xba, 0x9a, 0xab, 0xcb, 0x96, 0xaa, 0xe8 } };
// data object
static const GUID ASF_Data_Object = { MakeUns32LE(0x75b22636), MakeUns16LE(0x668e), MakeUns16LE(0x11cf), { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c } };
// XMP object
bool ASF_Support::WriteHeaderObject ( XMP_IO* sourceRef, XMP_IO* destRef, const ObjectData& object, ASF_LegacyManager& _legacyManager, bool usePadding )
{
if ( ! IsEqualGUID ( ASF_Header_Object, object.guid ) ) return false;
std::string buffer;
XMP_Uns16 valueUns16LE;
XMP_Uns32 valueUns32LE;
XMP_Uns64 valueUns64LE;
try {
// read header-object structure
XMP_Uns64 pos = object.pos;
XMP_Uns32 bufferSize = kASF_ObjectBaseLen + 6;
buffer.clear();
buffer.reserve ( bufferSize );
buffer.assign ( bufferSize, ' ' );
sourceRef->Seek ( pos, kXMP_SeekFromStart );
sourceRef->ReadAll ( const_cast<char*>(buffer.data()), bufferSize );
XMP_Uns64 read = bufferSize;
pos += bufferSize;
// read contained header objects
/*XMP_Uns32 numberOfHeaders = GetUns32LE ( &buffer[24] );*/
ASF_ObjectBase objectBase;
// prepare new header in memory
std::string header;
int changedObjects = _legacyManager.changedObjects();
int exportedObjects = 0;
int writtenObjects = 0;
header.append ( buffer.c_str(), bufferSize );
while ( read < object.len ) {
sourceRef->Seek ( pos, kXMP_SeekFromStart );
if ( kASF_ObjectBaseLen != sourceRef->Read ( &objectBase, kASF_ObjectBaseLen, true ) ) break;
sourceRef->Seek ( pos, kXMP_SeekFromStart );
objectBase.size = GetUns64LE ( &objectBase.size );
int headerStartPos = header.size();
// save position of filesize-information
if ( IsEqualGUID ( ASF_File_Properties_Object, objectBase.guid ) ) {
posFileSizeInfo = (headerStartPos + 40);
}
// write objects
if ( IsEqualGUID ( ASF_File_Properties_Object, objectBase.guid ) &&
(objectBase.size >= 104) && (changedObjects & ASF_LegacyManager::objectFileProperties) ) {
// copy object and replace creation-date
buffer.reserve ( XMP_Uns32 ( objectBase.size ) );
buffer.assign ( XMP_Uns32 ( objectBase.size ), ' ' );
sourceRef->ReadAll ( const_cast<char*>(buffer.data()), XMP_Int32(objectBase.size) );
header.append ( buffer, 0, XMP_Uns32( objectBase.size ) );
if ( ! _legacyManager.GetBroadcast() ) {
buffer = _legacyManager.GetField ( ASF_LegacyManager::fieldCreationDate );
ReplaceString ( header, buffer, (headerStartPos + 48), 8 );
}
exportedObjects |= ASF_LegacyManager::objectFileProperties;
} else if ( IsEqualGUID ( ASF_Content_Description_Object, objectBase.guid ) &&
(objectBase.size >= 34) && (changedObjects & ASF_LegacyManager::objectContentDescription) ) {
// re-create object with xmp-data
buffer.reserve ( XMP_Uns32( objectBase.size ) );
buffer.assign ( XMP_Uns32( objectBase.size ), ' ' );
sourceRef->ReadAll ( const_cast<char*>(buffer.data()), XMP_Int32(objectBase.size) );
// write header only
header.append ( buffer, 0, XMP_Uns32( kASF_ObjectBaseLen ) );
// write length fields
XMP_Uns16 titleLen = _legacyManager.GetField ( ASF_LegacyManager::fieldTitle).size( );
valueUns16LE = MakeUns16LE ( titleLen );
header.append ( (const char*)&valueUns16LE, 2 );
XMP_Uns16 authorLen = _legacyManager.GetField ( ASF_LegacyManager::fieldAuthor).size( );
valueUns16LE = MakeUns16LE ( authorLen );
header.append ( (const char*)&valueUns16LE, 2 );
XMP_Uns16 copyrightLen = _legacyManager.GetField ( ASF_LegacyManager::fieldCopyright).size( );
valueUns16LE = MakeUns16LE ( copyrightLen );
header.append ( (const char*)&valueUns16LE, 2 );
XMP_Uns16 descriptionLen = _legacyManager.GetField ( ASF_LegacyManager::fieldDescription).size( );
valueUns16LE = MakeUns16LE ( descriptionLen );
header.append ( (const char*)&valueUns16LE, 2 );
// retrieve existing overall length of preceding fields
XMP_Uns16 precedingLen = 0;
precedingLen += GetUns16LE ( &buffer[24] ); // Title
precedingLen += GetUns16LE ( &buffer[26] ); // Author
precedingLen += GetUns16LE ( &buffer[28] ); // Copyright
precedingLen += GetUns16LE ( &buffer[30] ); // Description
// retrieve existing 'Rating' length
XMP_Uns16 ratingLen = GetUns16LE ( &buffer[32] ); // Rating
valueUns16LE = MakeUns16LE ( ratingLen );
header.append ( (const char*)&valueUns16LE, 2 );
// write field contents
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldTitle ) );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldAuthor ) );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldCopyright ) );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldDescription ) );
header.append ( buffer, (34 + precedingLen), ratingLen );
// update new object size
valueUns64LE = MakeUns64LE ( header.size() - headerStartPos );
std::string newSize ( (const char*)&valueUns64LE, 8 );
ReplaceString ( header, newSize, (headerStartPos + 16), 8 );
exportedObjects |= ASF_LegacyManager::objectContentDescription;
} else if ( IsEqualGUID ( ASF_Content_Branding_Object, objectBase.guid ) &&
(changedObjects & ASF_LegacyManager::objectContentBranding) ) {
// re-create object with xmp-data
buffer.reserve ( XMP_Uns32( objectBase.size ) );
buffer.assign ( XMP_Uns32( objectBase.size ), ' ' );
sourceRef->ReadAll ( const_cast<char*>(buffer.data()), XMP_Int32(objectBase.size) );
// calculate size of fields coming before 'Copyright URL'
XMP_Uns32 length = 28;
length += (GetUns32LE ( &buffer[length] ) + 4); // Banner Image Data
length += (GetUns32LE ( &buffer[length] ) + 4); // Banner Image URL
// write first part of header
header.append ( buffer, 0, length );
// copyright URL
length = _legacyManager.GetField ( ASF_LegacyManager::fieldCopyrightURL).size( );
valueUns32LE = MakeUns32LE ( length );
header.append ( (const char*)&valueUns32LE, 4 );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldCopyrightURL ) );
// update new object size
valueUns64LE = MakeUns64LE ( header.size() - headerStartPos );
std::string newSize ( (const char*)&valueUns64LE, 8 );
ReplaceString ( header, newSize, (headerStartPos + 16), 8 );
exportedObjects |= ASF_LegacyManager::objectContentBranding;
#if ! Exclude_LicenseURL_Recon
} else if ( IsEqualGUID ( ASF_Content_Encryption_Object, objectBase.guid ) &&
(changedObjects & ASF_LegacyManager::objectContentEncryption) ) {
// re-create object with xmp-data
buffer.reserve ( XMP_Uns32( objectBase.size ) );
buffer.assign ( XMP_Uns32( objectBase.size ), ' ' );
sourceRef->ReadAll ( const_cast<char*>(buffer.data()), XMP_Int32(objectBase.size) );
// calculate size of fields coming before 'License URL'
XMP_Uns32 length = 24;
length += (GetUns32LE ( &buffer[length] ) + 4); // Secret Data
length += (GetUns32LE ( &buffer[length] ) + 4); // Protection Type
length += (GetUns32LE ( &buffer[length] ) + 4); // Key ID
// write first part of header
header.append ( buffer, 0, length );
// License URL
length = _legacyManager.GetField ( ASF_LegacyManager::fieldLicenseURL).size( );
valueUns32LE = MakeUns32LE ( length );
header.append ( (const char*)&valueUns32LE, 4 );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldLicenseURL ) );
// update new object size
valueUns64LE = MakeUns64LE ( header.size() - headerStartPos );
std::string newSize ( (const char*)&valueUns64LE, 8 );
ReplaceString ( header, newSize, (headerStartPos + 16), 8 );
exportedObjects |= ASF_LegacyManager::objectContentEncryption;
#endif
} else if ( IsEqualGUID ( ASF_Header_Extension_Object, objectBase.guid ) && usePadding ) {
// re-create object if padding needs to be used
buffer.reserve ( XMP_Uns32( objectBase.size ) );
buffer.assign ( XMP_Uns32( objectBase.size ), ' ' );
sourceRef->ReadAll ( const_cast<char*>(buffer.data()), XMP_Int32(objectBase.size) );
ASF_Support::WriteHeaderExtensionObject ( buffer, &header, objectBase, 0 );
} else if ( IsEqualGUID ( ASF_Padding_Object, objectBase.guid ) && usePadding ) {
// eliminate padding (will be created as last object)
} else {
// simply copy all other objects
buffer.reserve ( XMP_Uns32( objectBase.size ) );
buffer.assign ( XMP_Uns32( objectBase.size ), ' ' );
sourceRef->ReadAll ( const_cast<char*>(buffer.data()), XMP_Int32(objectBase.size) );
header.append ( buffer, 0, XMP_Uns32( objectBase.size ) );
}
pos += objectBase.size;
read += objectBase.size;
writtenObjects ++;
}
// any objects to create ?
int newObjects = (changedObjects ^ exportedObjects);
if ( newObjects ) {
// create new objects with xmp-data
int headerStartPos;
ASF_ObjectBase newObjectBase;
XMP_Uns32 length;
if ( newObjects & ASF_LegacyManager::objectContentDescription ) {
headerStartPos = header.size();
newObjectBase.guid = ASF_Content_Description_Object;
newObjectBase.size = 0;
// write object header
header.append ( (const char*)&newObjectBase, kASF_ObjectBaseLen );
XMP_Uns16 titleLen = _legacyManager.GetField ( ASF_LegacyManager::fieldTitle).size( );
valueUns16LE = MakeUns16LE ( titleLen );
header.append ( (const char*)&valueUns16LE, 2 );
XMP_Uns16 authorLen = _legacyManager.GetField ( ASF_LegacyManager::fieldAuthor).size( );
valueUns16LE = MakeUns16LE ( authorLen );
header.append ( (const char*)&valueUns16LE, 2 );
XMP_Uns16 copyrightLen = _legacyManager.GetField ( ASF_LegacyManager::fieldCopyright).size( );
valueUns16LE = MakeUns16LE ( copyrightLen );
header.append ( (const char*)&valueUns16LE, 2 );
XMP_Uns16 descriptionLen = _legacyManager.GetField ( ASF_LegacyManager::fieldDescription).size( );
valueUns16LE = MakeUns16LE ( descriptionLen );
header.append ( (const char*)&valueUns16LE, 2 );
XMP_Uns16 ratingLen = 0;
valueUns16LE = MakeUns16LE ( ratingLen );
header.append ( (const char*)&valueUns16LE, 2 );
// write field contents
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldTitle ) );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldAuthor ) );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldCopyright ) );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldDescription ) );
// update new object size
valueUns64LE = MakeUns64LE ( header.size() - headerStartPos );
std::string newSize ( (const char*)&valueUns64LE, 8 );
ReplaceString ( header, newSize, (headerStartPos + 16), 8 );
newObjects &= ~ASF_LegacyManager::objectContentDescription;
writtenObjects ++;
}
if ( newObjects & ASF_LegacyManager::objectContentBranding ) {
headerStartPos = header.size();
newObjectBase.guid = ASF_Content_Branding_Object;
newObjectBase.size = 0;
// write object header
header.append ( (const char*)&newObjectBase, kASF_ObjectBaseLen );
// write 'empty' fields
header.append ( 12, '\0' );
// copyright URL
length = _legacyManager.GetField ( ASF_LegacyManager::fieldCopyrightURL).size( );
valueUns32LE = MakeUns32LE ( length );
header.append ( (const char*)&valueUns32LE, 4 );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldCopyrightURL ) );
// update new object size
valueUns64LE = MakeUns64LE ( header.size() - headerStartPos );
std::string newSize ( (const char*)&valueUns64LE, 8 );
ReplaceString ( header, newSize, (headerStartPos + 16), 8 );
newObjects &= ~ASF_LegacyManager::objectContentBranding;
writtenObjects ++;
}
#if ! Exclude_LicenseURL_Recon
if ( newObjects & ASF_LegacyManager::objectContentEncryption ) {
headerStartPos = header.size();
newObjectBase.guid = ASF_Content_Encryption_Object;
newObjectBase.size = 0;
// write object header
header.append ( (const char*)&newObjectBase, kASF_ObjectBaseLen );
// write 'empty' fields
header.append ( 12, '\0' );
// License URL
length = _legacyManager.GetField ( ASF_LegacyManager::fieldLicenseURL).size( );
valueUns32LE = MakeUns32LE ( length );
header.append ( (const char*)&valueUns32LE, 4 );
header.append ( _legacyManager.GetField ( ASF_LegacyManager::fieldLicenseURL ) );
// update new object size
valueUns64LE = MakeUns64LE ( header.size() - headerStartPos );
std::string newSize ( (const char*)&valueUns64LE, 8 );
ReplaceString ( header, newSize, (headerStartPos + 16), 8 );
newObjects &= ~ASF_LegacyManager::objectContentEncryption;
writtenObjects ++;
}
#endif
}
// create padding object ?
if ( usePadding && (header.size ( ) < object.len ) ) {
ASF_Support::CreatePaddingObject ( &header, (object.len - header.size()) );
writtenObjects ++;
}
// update new header-object size
valueUns64LE = MakeUns64LE ( header.size() );
std::string newValue ( (const char*)&valueUns64LE, 8 );
ReplaceString ( header, newValue, 16, 8 );
// update new number of Header objects
valueUns32LE = MakeUns32LE ( writtenObjects );
newValue = std::string ( (const char*)&valueUns32LE, 4 );
ReplaceString ( header, newValue, 24, 4 );
// if we are operating on the same file (in-place update), place pointer before writing
if ( sourceRef == destRef ) destRef->Seek ( object.pos, kXMP_SeekFromStart );
if ( this->progressTracker != 0 )
{
XMP_Assert ( this->progressTracker->WorkInProgress() );
this->progressTracker->AddTotalWork ( (float)header.size() );
}
// write header
destRef->Write ( header.c_str(), header.size() );
} catch ( ... ) {
return false;
}
return true;
}
bool MakeChunk ( LFA_FileRef inFileRef, RiffState & inOutRiffState, long riffType, UInt32 len )
{
long starttag;
UInt32 taglen;
UInt32 rifflen, avail;
UInt64 pos;
/* look for top level Premiere padding chunk */
starttag = 0;
while ( FindChunk ( inOutRiffState, ckidPremierePadding, riffType, 0, &starttag, &taglen, &pos ) ) {
pos -= 8;
taglen += 8;
long extra = taglen - len;
if ( extra < 0 ) continue;
RiffIterator iter = inOutRiffState.tags.begin();
iter += (starttag - 1);
if ( extra == 0 ) {
iter->len = 0;
} else {
atag pad;
UInt64 padpos;
/* need 8 bytes extra to be able to split it */
extra -= 8;
if ( extra < 0 ) continue;
try{
padpos = pos + len;
LFA_Seek ( inFileRef, padpos, SEEK_SET );
pad.id = MakeUns32LE ( ckidPremierePadding );
pad.len = MakeUns32LE ( extra );
LFA_Write ( inFileRef, &pad, sizeof(pad) );
} catch ( ... ) {
return false;
}
iter->pos = padpos + 8;
iter->len = extra;
}
/* seek back to start of original padding chunk */
LFA_Seek ( inFileRef, pos, SEEK_SET );
return true;
}
/* can't take padding chunk, so append new chunk to end of file */
rifflen = inOutRiffState.rifflen + 8;
avail = AVIMAXCHUNKSIZE - rifflen;
LFA_Seek ( inFileRef, 0, SEEK_END );
pos = GetFilePosition ( inFileRef );
if ( (pos & 1) == 1 ) {
// The file length is odd, need a pad byte.
XMP_Uns8 pad = 0;
LFA_Write ( inFileRef, &pad, 1 );
++pos;
}
if ( avail < len ) {
/* if needed, create new AVIX chunk */
ltag avix;
avix.id = MakeUns32LE ( FOURCC_RIFF );
avix.len = MakeUns32LE ( 4 + len );
avix.subid = MakeUns32LE ( formtypeAVIX );
LFA_Write(inFileRef, &avix, sizeof(avix));
pos += 12;
AddTag ( inOutRiffState, avix.id, len, pos, 0, 0, 0 );
} else {
/* otherwise, rewrite length of last RIFF chunk in file */
pos = inOutRiffState.riffpos + 4;
rifflen = inOutRiffState.rifflen + len;
XMP_Uns32 fileLen = MakeUns32LE ( rifflen );
LFA_Seek ( inFileRef, pos, SEEK_SET );
LFA_Write ( inFileRef, &fileLen, 4 );
inOutRiffState.rifflen = rifflen;
/* prepare to write data */
LFA_Seek ( inFileRef, 0, SEEK_END );
}
return true;
}
static inline XMP_Uns32 ReadUns32_LE ( XMP_IO* file )
{
XMP_Uns32 value;
file->ReadAll ( &value, 4 );
return MakeUns32LE ( value );
}
static inline void WriteUns32_LE ( XMP_IO* file, XMP_Uns32 value )
{
XMP_Uns32 v = MakeUns32LE ( value );
file->Write ( &v, 4 );
}