Loading PDFs from memory

Hi,
I'm using PDFLib 8.1 to open PDF documents for creating PNG previews. Using some example code I've successfully created preview images from PDF documents on my file system. What I would like to do is be able to do exactly the same, however the PDF document are stored in a memory buffer.
I understand from reading similar queries that I need to create my own ASFileSys (and/or ASFile) to implement reading from memory. Can anyone help point me in the right direction for doing this please? Has anyone done anything similar to this? Any code snippets that anyone has will be greatly appreciated.
Many thanks,
Alan.

Hi,
Thanks for your reply.
I don't seem to be able to find any ASFileSys samples / skeletons so I'm fighting this problem in the dark :(
I have instantiated a new ASFileSysRec as follows...
ASFileSysRec pdfMemoryFileSys;
memset( &pdfMemoryFileSys, 0, sizeof( ASFileSysRec ) );
pdfMemoryFileSys.size = sizeof( ASFileSysRec );
pdfMemoryFileSys.open = OpenMemory;
pdfMemoryFileSys.close = CloseMemory;
pdfMemoryFileSys.flush = FlushMemory;
pdfMemoryFileSys.setpos = SetPosMemory;
pdfMemoryFileSys.getpos = GetPosMemory;
pdfMemoryFileSys.seteof = SetEofMemory;
pdfMemoryFileSys.geteof = GetEofMemory;
pdfMemoryFileSys.read = ReadMemory;
...etc
(a very laborious task to implement each callback!)
and I have got as far as ASFileSysCreatePathName working (calls pdfMemoryFileSys.createPathName) and I even see SetPosMemory / ReadMemory / etc being called from PDDocOpen (I simply return the required memory buffer position from a global buffer).
However I get all sort of problems (exceptions thrown) - I'm pretty sure I'm returning the correct buffer contents/seek positions, etc. I have noticed the following callback functions...
pdfMemoryFileSys.firstFolderItem (ASFileSysFirstFolderItemProc)
pdfMemoryFileSys.nextFolderItem (ASFileSysFirstFolderItemProc)
...etc
I've no idea what to return in these callbacks (?).
It's very frustrating, I don't believe I'm asking for anything too out of the ordinary by wanting to load a PDF from memory instead of a file!
I'm hoping that someone will tell me I'm crazy to be doing what I'm doing and that there's a much simpler way (?!).

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//The below variables are global;
DWORD FileSize;//size of main PDF file
char * lpBuffer;//PDF buffer,please save binary PDF data into this buffer
DWORD dwDataSize;//size of main PDF file
DWORD dwDataIndex;//is a pointer for lpBuffer position.ex. lpBuffer[dwDataIndex]
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ASFileSys myFileSys;
memset (&MyFileSys, 0, sizeof(ASFileSysRec));
MyFileSys.size = sizeof(ASFileSysRec);
MyFileSys.open = ASCallbackCreateProto (ASFileSysOpenProc, MyASFileSysOpenProc);
MyFileSys.close = ASCallbackCreateProto (ASFileSysCloseProc, MyASFileSysCloseProc);
MyFileSys.flush = ASCallbackCreateProto (ASFileSysFlushProc, MyASFileSysFlushProc);
MyFileSys.setpos = ASCallbackCreateProto (ASFileSysSetPosProc, MyASFileSysSetPosProc);
MyFileSys.getpos = ASCallbackCreateProto (ASFileSysGetPosProc, MyASFileSysGetPosProc);
MyFileSys.seteof = ASCallbackCreateProto (ASFileSysSetEofProc, MyASFileSysSetEofProc);
MyFileSys.geteof = ASCallbackCreateProto (ASFileSysGetEofProc, MyASFileSysGetEofProc);
MyFileSys.read = ASCallbackCreateProto (ASFileSysReadProc, MyASFileSysReadProc);
MyFileSys.write = ASCallbackCreateProto (ASFileSysWriteProc, MyASFileSysWriteProc);
MyFileSys.remove = ASCallbackCreateProto (ASFileSysRemoveProc, MyASFileSysRemoveProc);
MyFileSys.rename = ASCallbackCreateProto (ASFileSysRenameProc, MyASFileSysRenameProc);
MyFileSys.isSameFile = ASCallbackCreateProto (ASFileSysIsSameFileProc, MyASFileSysIsSameFileProc);
MyFileSys.getName = ASCallbackCreateProto (ASFileSysGetNameProc, MyASFileSysGetNameProc);
MyFileSys.getNameAsASText = ASCallbackCreateProto (ASFileSysGetNameAsASTextProc, MyASFileSysGetNameAsASTextProc);
MyFileSys.getTempPathName = ASCallbackCreateProto (ASFileSysGetTempPathNameProc, MyASFileSysGetTempPathNameProc);
MyFileSys.copyPathName = ASCallbackCreateProto (ASFileSysCopyPathNameProc, MyASFileSysCopyPathNameProc);
MyFileSys.diPathFromPath = ASCallbackCreateProto (ASFileSysDiPathFromPathProc, MyASFileSysDiPathFromPathProc);
MyFileSys.pathFromDIPath = ASCallbackCreateProto (ASFileSysPathFromDIPathProc, MyASFileSysPathFromDIPathProc);
MyFileSys.disposePathName = ASCallbackCreateProto (ASFileSysDisposePathNameProc, MyASFileSysDisposePathNameProc);
MyFileSys.getFileSysName = ASCallbackCreateProto (ASFileSysGetFileSysNameProc, MyASFileSysGetFileSysNameProc);
MyFileSys.getStorageFreeSpace = ASCallbackCreateProto (ASFileSysGetStorageFreeSpaceProc, MyASFileSysGetStorageFreeSpaceProc);
MyFileSys.flushVolume = ASCallbackCreateProto (ASFileSysFlushVolumeProc, MyASFileSysFlushVolumeProc);
MyFileSys.createPathName = ASCallbackCreateProto (ASFileSysCreatePathNameProc, MyASFileSysCreatePathNameProc);
MyFileSys.getItemProps = ASCallbackCreateProto (ASFileSysGetItemPropsProc, MyASFileSysGetItemPropsProc);
MyFileSys.firstFolderItem = ASCallbackCreateProto (ASFileSysFirstFolderItemProc, MyASFileSysFirstFolderItemProc);
MyFileSys.nextFolderItem = ASCallbackCreateProto (ASFileSysNextFolderItemProc, MyASFileSysNextFolderItemProc);
MyFileSys.destroyFolderIterator = ASCallbackCreateProto (ASFileSysDestroyFolderIteratorProc, MyASFileSysDestroyFolderIteratorProc);
MyFileSys.urlFromPath = ASCallbackCreateProto (ASFileSysURLFromPathProc, MyASFileSysURLFromPathProc);
MyFileSys.getParent = ASCallbackCreateProto (ASFileSysGetParentProc, MyASFileSysGetParentProc);
MyFileSys.createFolder = ASCallbackCreateProto (ASFileSysCreateFolderProc, MyASFileSysCreateFolderProc);
MyFileSys.removeFolder = ASCallbackCreateProto (ASFileSysRemoveFolderProc, MyASFileSysRemoveFolderProc);
MyFileSys.displayStringFromPath = ASCallbackCreateProto (ASFileSysDisplayStringFromPathProc, MyASFileSysDisplayStringFromPathProc);
MyFileSys.setTypeAndCreator = ASCallbackCreateProto (ASFileSysSetTypeAndCreatorProc, MyASFileSysSetTypeAndCreatorProc);
MyFileSys.getTypeAndCreator = ASCallbackCreateProto (ASFileSysGetTypeAndCreatorProc, MyASFileSysGetTypeAndCreatorProc);
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MyFileSys.acquirePlatformPath = ASCallbackCreateProto (ASFileSysAcquirePlatformPathProc, MyASFileSysAcquirePlatformPathProc);
MyFileSys.releasePlatformPath = ASCallbackCreateProto (ASFileSysReleasePlatformPathProc, MyASFileSysReleasePlatformPathProc);
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static ACCB1 ASInt32 ACCB2 MyASFileSysOpenProc (ASPathName pathName, ASUns16 mode, MDFile *fP)
dwDataIndex = 0;
dwDataSize = FileSize;//size of main PDF file
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysCloseProc (MDFile f)
dwDataIndex = 0;//set PDF buffer pointer to zero
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysFlushProc (MDFile f)
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysSetPosProc (MDFile f, ASUns32 pos)
dwDataIndex = (DWORD)pos;
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysGetPosProc (MDFile f, ASUns32 *pos)
*pos = (ASFilePos)dwDataIndex;
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysSetEofProc (MDFile f, ASUns32 pos)
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysGetEofProc (MDFile f, ASUns32 *pos)
*pos = (ASFilePos)dwDataSize;
return 0;
static ACCB1 ASSize_t ACCB2 MyASFileSysReadProc (void *ptr, ASSize_t size, ASSize_t count, MDFile f, ASInt32 *pError)
*pError = 0;
if ( ptr == NULL )
return 0;
DWORD dwRemaining = dwDataSize - dwDataIndex;
DWORD dwReadSize = min( dwRemaining, (DWORD)( size * count ) );
CopyMemory(ptr, &lpBuffer[ dwDataIndex ], dwReadSize );
dwDataIndex += dwReadSize;
return (ASSize_t)dwReadSize;
static ACCB1 ASSize_t ACCB2 MyASFileSysWriteProc (void *ptr, ASSize_t size, ASSize_t count, MDFile f, ASInt32 *pError)
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysRemoveProc (ASPathName pathName)
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysRenameProc (ASMDFile* f, ASPathName oldPath, ASPathName newPath)
return 0;
static ACCB1 ASBool ACCB2 MyASFileSysIsSameFileProc (ASMDFile f, ASPathName pathName, ASPathName newPathName)
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysGetNameProc (ASPathName pathName, char *name, ASInt32 maxLength)
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysGetNameAsASTextProc (ASPathName pathName, ASText name)
return 0;
static ACCB1 ASPathName ACCB2 MyASFileSysGetTempPathNameProc (ASPathName pathName)
return (ASPathName)PDF_MEMORY_FILESYS;
static ACCB1 ASPathName ACCB2 MyASFileSysCopyPathNameProc (ASPathName pathName)
return (ASPathName)PDF_MEMORY_FILESYS;
static ACCB1 char * ACCB2 MyASFileSysDiPathFromPathProc (ASPathName path, ASPathName relativeToThisPath)
return NULL;
static ACCB1 ASPathName ACCB2 MyASFileSysPathFromDIPathProc (const char * diPath, ASPathName relativeToThisPath)
return (ASPathName)PDF_MEMORY_FILESYS;
static ACCB1 void ACCB2 MyASFileSysDisposePathNameProc (ASPathName pathName)
static ACCB1 ASAtom ACCB2 MyASFileSysGetFileSysNameProc (void)
return NULL;
static ACCB1 ASUns32 ACCB2 MyASFileSysGetStorageFreeSpaceProc (ASPathName pathName)
return INT_MAX;
static ACCB1 ASInt32 ACCB2 MyASFileSysFlushVolumeProc (ASPathName pathName)
return 0;
static ACCB1 ASPathName ACCB2 MyASFileSysCreatePathNameProc (ASAtom pathSpecType, const void *pathSpec, const void *mustBeZero)
return (ASPathName)PDF_MEMORY_FILESYS;
static ACCB1 ASInt32 ACCB2 MyASFileSysGetItemPropsProc (ASPathName pathName, ASFileSysItemProps props)
return 0;
static ACCB1 ASFolderIterator ACCB2 MyASFileSysFirstFolderItemProc (ASPathName folderPath, ASFileSysItemProps props, ASPathName *itemPath)
return NULL;
static ACCB1 ASBool ACCB2 MyASFileSysNextFolderItemProc (ASFolderIterator folderIter, ASFileSysItemProps props, ASPathName *itemPath)
return 0;
static ACCB1 void ACCB2 MyASFileSysDestroyFolderIteratorProc (ASFolderIterator folderIter)
static ACCB1 char * ACCB2 MyASFileSysURLFromPathProc (ASPathName path)
return NULL;
static ACCB1 ASPathName ACCB2 MyASFileSysGetParentProc (ASPathName path)
return NULL;
static ACCB1 ASInt32 ACCB2 MyASFileSysCreateFolderProc (ASPathName path)
return 0;
static ACCB1 ASInt32 ACCB2 MyASFileSysRemoveFolderProc (ASPathName path)
return 0;
static ACCB1 char * ACCB2 MyASFileSysDisplayStringFromPathProc (ASPathName path)
return NULL;
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static ACCB1 void ACCB2 MyASFileSysGetTypeAndCreatorProc (ASPathName path, unsigned long *type, unsigned long *creator)
static ACCB1 ASInt32 ACCB2 MyASFileSysAcquirePlatformPathProc(ASPathName path, ASAtom platformPathType, ASPlatformPath *platformPath)
return 0;
static ACCB1 void ACCB2 MyASFileSysReleasePlatformPathProc(ASPlatformPath platformPath)
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