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// =================================================================================================
// ADOBE SYSTEMS INCORPORATED
// Copyright 2007 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 "ISOBaseMedia_Support.hpp"
#include "XMPFiles_Impl.hpp"
// =================================================================================================
/// \file ISOBaseMedia_Support.cpp
/// \brief Manager for parsing and serializing ISO Base Media files ( MPEG-4 and JPEG-2000).
///
// =================================================================================================
namespace ISOMedia {
static BoxInfo voidInfo;
// =================================================================================================
// GetBoxInfo - from memory
// ========================
const XMP_Uns8 * GetBoxInfo ( const XMP_Uns8 * boxPtr, const XMP_Uns8 * boxLimit,
BoxInfo * info, bool throwErrors /* = false */ )
{
XMP_Uns32 u32Size;
if ( info == 0 ) info = &voidInfo;
info->boxType = info->headerSize = 0;
info->contentSize = 0;
if ( boxPtr >= boxLimit ) XMP_Throw ( "Bad offset to GetBoxInfo", kXMPErr_InternalFailure );
if ( (boxLimit - boxPtr) < 8 ) { // Is there enough space for a standard box header?
if ( throwErrors ) XMP_Throw ( "No space for ISO box header", kXMPErr_BadFileFormat );
info->headerSize = (XMP_Uns32) (boxLimit - boxPtr);
return boxLimit;
}
u32Size = GetUns32BE ( boxPtr );
info->boxType = GetUns32BE ( boxPtr+4 );
if ( u32Size >= 8 ) {
info->headerSize = 8; // Normal explicit size case.
info->contentSize = u32Size - 8;
} else if ( u32Size == 0 ) {
info->headerSize = 8; // The box goes to EoF - treat it as "to limit".
info->contentSize = (boxLimit - boxPtr) - 8;
} else if ( u32Size != 1 ) {
if ( throwErrors ) XMP_Throw ( "Bad ISO box size, 2..7", kXMPErr_BadFileFormat );
info->headerSize = 8; // Bad total size in the range of 2..7, treat as 8.
info->contentSize = 0;
} else {
if ( (boxLimit - boxPtr) < 16 ) { // Is there enough space for an extended box header?
if ( throwErrors ) XMP_Throw ( "No space for ISO extended header", kXMPErr_BadFileFormat );
info->headerSize = (XMP_Uns32) (boxLimit - boxPtr);
return boxLimit;
}
XMP_Uns64 u64Size = GetUns64BE ( boxPtr+8 );
if ( u64Size < 16 ) {
if ( throwErrors ) XMP_Throw ( "Bad ISO extended box size, < 16", kXMPErr_BadFileFormat );
u64Size = 16; // Treat bad total size as 16.
}
info->headerSize = 16;
info->contentSize = u64Size - 16;
}
XMP_Assert ( (XMP_Uns64)(boxLimit - boxPtr) >= (XMP_Uns64)info->headerSize );
if ( info->contentSize > (XMP_Uns64)((boxLimit - boxPtr) - info->headerSize) ) {
if ( throwErrors ) XMP_Throw ( "Bad ISO box content size", kXMPErr_BadFileFormat );
info->contentSize = ((boxLimit - boxPtr) - info->headerSize); // Trim a bad content size to the limit.
}
return (boxPtr + info->headerSize + info->contentSize);
} // GetBoxInfo
// =================================================================================================
// GetBoxInfo - from a file
// ========================
XMP_Uns64 GetBoxInfo ( LFA_FileRef fileRef, const XMP_Uns64 boxOffset, const XMP_Uns64 boxLimit,
BoxInfo * info, bool doSeek /* = true */, bool throwErrors /* = false */ )
{
XMP_Uns8 buffer [8];
XMP_Uns32 u32Size;
if ( info == 0 ) info = &voidInfo;
info->boxType = info->headerSize = 0;
info->contentSize = 0;
if ( boxOffset >= boxLimit ) XMP_Throw ( "Bad offset to GetBoxInfo", kXMPErr_InternalFailure );
if ( (boxLimit - boxOffset) < 8 ) { // Is there enough space for a standard box header?
if ( throwErrors ) XMP_Throw ( "No space for ISO box header", kXMPErr_BadFileFormat );
info->headerSize = (XMP_Uns32) (boxLimit - boxOffset);
return boxLimit;
}
if ( doSeek ) LFA_Seek ( fileRef, boxOffset, SEEK_SET );
(void) LFA_Read ( fileRef, buffer, 8, kLFA_RequireAll );
u32Size = GetUns32BE ( &buffer[0] );
info->boxType = GetUns32BE ( &buffer[4] );
if ( u32Size >= 8 ) {
info->headerSize = 8; // Normal explicit size case.
info->contentSize = u32Size - 8;
} else if ( u32Size == 0 ) {
info->headerSize = 8; // The box goes to EoF.
info->contentSize = LFA_Measure(fileRef) - (boxOffset + 8);
} else if ( u32Size != 1 ) {
if ( throwErrors ) XMP_Throw ( "Bad ISO box size, 2..7", kXMPErr_BadFileFormat );
info->headerSize = 8; // Bad total size in the range of 2..7, treat as 8.
info->contentSize = 0;
} else {
if ( (boxLimit - boxOffset) < 16 ) { // Is there enough space for an extended box header?
if ( throwErrors ) XMP_Throw ( "No space for ISO extended header", kXMPErr_BadFileFormat );
info->headerSize = (XMP_Uns32) (boxLimit - boxOffset);
return boxLimit;
}
(void) LFA_Read ( fileRef, buffer, 8, kLFA_RequireAll );
XMP_Uns64 u64Size = GetUns64BE ( &buffer[0] );
if ( u64Size < 16 ) {
if ( throwErrors ) XMP_Throw ( "Bad ISO extended box size, < 16", kXMPErr_BadFileFormat );
u64Size = 16; // Treat bad total size as 16.
}
info->headerSize = 16;
info->contentSize = u64Size - 16;
}
XMP_Assert ( (boxLimit - boxOffset) >= info->headerSize );
if ( info->contentSize > (boxLimit - boxOffset - info->headerSize) ) {
if ( throwErrors ) XMP_Throw ( "Bad ISO box content size", kXMPErr_BadFileFormat );
info->contentSize = (boxLimit - boxOffset - info->headerSize); // Trim a bad content size to the limit.
}
return (boxOffset + info->headerSize + info->contentSize);
} // GetBoxInfo
} // namespace ISO_Media
// =================================================================================================
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