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iffparse

Index


AllocIFF() AllocLocalItem() CloseClipboard() CloseIFF()
CollectionChunk() CollectionChunks() CurrentChunk() EntryHandler()
ExitHandler() FindCollection() FindLocalItem() FindProp()
FindPropContext() FreeIFF() FreeLocalItem() GoodID()
GoodType() IDtoStr() InitIFF() InitIFFasClip()
InitIFFasDOS() LocalItemData() OpenClipboard() OpenIFF()
ParentChunk() ParseIFF() PopChunk() PropChunk()
PropChunks() PushChunk() ReadChunkBytes() ReadChunkRecords()
SetLocalItemPurge() StopChunk() StopChunks() StopOnExit()
StoreItemInContext() StoreLocalItem() WriteChunkBytes() WriteChunkRecords()

AllocIFF()

Synopsis

struct IFFHandle * AllocIFF();

Function

Allocates an IFFHandle struct.

Result

An unitialized IFFHandle structure.

Notes

The default context-node is created in AllocIFF() and persists until
FreeIFF().

AllocLocalItem()

Synopsis

struct LocalContextItem * AllocLocalItem(
         LONG type,
         LONG id,
         LONG ident,
         ULONG dataSize );

Function

Allocates and initializes a LocalContextItem structure. It also allocates
dataSize user data. User data can be accesseed via LocalItemData function.
This is the only way to allocate such a item, since the item contains private
fields. Of course programmers should assume NOTHING about this private
fields.

Inputs

type, id   - Longword identifications values.
ident      - Longword identifier for class of item.
dataSize      -  Size of a user data area that will be allocated by this funcyion.

Result

item      - A initialized LocalContextItem structure.

Notes

Changed dataSize parameter to ULONG, negative-sized memory allocations are undefined.

Bugs

See notes.

CloseClipboard()

Synopsis

void CloseClipboard(
         struct ClipboardHandle * clipHandle );

Function

Closes the clipboard.device and frees the ClipboardHandle

Inputs

clip - pointer to a ClipboardHandle struct created with OpenClipboard.

Result

None.

CloseIFF()

Synopsis

void CloseIFF(
         struct IFFHandle * iff );

Function

Completes a read or write session by closing the IFF handle.
The IFFHandle struct is ready for reuse in another session,
it's just to open it again with OpenIFF(). This function
also automatically cleans up if a read or write fails halfway through.

Inputs

iff - Pointer to an IFFhandle struct previously opened with OpenIFF()

Notes

This function tells the custom stream handler to clean up
by sending it a IFFCMD_CLEANUP IFFStreamCmd.

CollectionChunk()

Synopsis

LONG CollectionChunk(
         struct IFFHandle * iff,
         LONG type,
         LONG id );

Function

Installs an entry handler with the given type and id, so that
chunks encountered with the same type and id will be stored.
This is quite like PropChunk(), but CollectionChunk() will
store the contents of multiple chunks with the same type and id.
To retrieve the stored collection of chunks one uses FindCollection().
Remember: the collection is only valid inside the current property scope.

Inputs

iff   - Pointer to IFFHandle struct. (does not need to be open).
type  - IFF chunk type declarator for chunk to collect.
id    -  IFF chunk id identifier for chunk to collect.

Result

error - 0 if successfulle. IFFERR_#? elsewise.

CollectionChunks()

Synopsis

LONG CollectionChunks(
         struct IFFHandle * iff,
         const LONG       * propArray,
         LONG numPairs );

Function

Does multiple CollectionChunk() calls on the supplied list.
An easy way to install several collction chunks.

Inputs

iff       - pointer to an IFFHandle struct.
propArray  - pointer to an array of longword chunk types and identifiers.
numPairs  - number of type/id pairs in the propArray.

Result

error      - 0 if successfull, IFFERR_#? otherwise.

CurrentChunk()

Synopsis

struct ContextNode * CurrentChunk(
         struct IFFHandle * iff );

Function

Returns the top context node for the give IFFHandle struct.
The top contexte is the node most recently pushed onto the
context stack

Inputs

iff  - pointer to IFFHandle struct.

Result

top - Pointer to top contextnode or NULL if none.

EntryHandler()

Synopsis

LONG EntryHandler(
         struct IFFHandle * iff,
         LONG type,
         LONG id,
         LONG position,
         struct Hook      * handler,
         APTR object );

Function

Installs an entry handler for a specific chunk type
that wil be called whenever a chunk of that type is pushed on the contextstack
via ParseIFF().

Inputs

iff         - pointer to an iffhandle struct.
type      - type code for the chunk to handle. (ex: "ILBM").
id        -  ID code for the chunk to handle. (ex: "CMAP")
position  -  position of localcontextitem. See StoreLocalItem for
            more info.
handler    -  an initialised Hook structure for the handler function.
object    -  pointer to some kind of object that will be passed to
            your handler function.

Result

error - 0 If successfull, IFFERR_#? elsewise.

ExitHandler()

Synopsis

LONG ExitHandler(
         struct IFFHandle * iff,
         LONG type,
         LONG id,
         LONG position,
         struct Hook      * handler,
         APTR object );

Function

Installs an exit handler for a specific chunk type
that wil be called whenever a chunk of that type is popped off the contextstack
via ParseIFF().

Inputs

iff         - pointer to an iffhandle struct.
type      - type code for the chunk to handle. (ex: "ILBM").
id        -  ID code for the chunk to handle. (ex: "CMAP")
position  -  position of localcontextitem. See StoreLocalItem for
            more info.
handler    -  an initialised Hook structure for the handler function.
object    -  pointer to some kind of object that will be passed to
            your handler function.

Result

error - 0 If successfull, IFFERR_#? elsewise.

FindCollection()

Synopsis

struct CollectionItem * FindCollection(
         struct IFFHandle * iff,
         LONG type,
         LONG id );

Function

Returns a pointer to a list of CollectionItems the installed
CollectionChunk of that type and ID.

Inputs

iff   - pointer to an IFFHandle struct.
type  - type code to search for.
id    -  id code to search for.

Result

ci - pointer to the last collection chunk encountered
     with pointers to previous ones.

FindLocalItem()

Synopsis

struct LocalContextItem * FindLocalItem(
         struct IFFHandle * iff,
         LONG type,
         LONG id,
         LONG ident );

Function

Goes through the whole context node stack starting at the top
searching the contecnodes for attached LocalContextItems with the
specified type, id and ident codes.

Inputs

iff   - pointer to an IFFHandle struct.
type  - type code for item to find.
id    -  identifier code for item to find.
ident - ident code for the class of context item to find.

Result

lci   - pointer to a local context item if found, or NULL if
        none is found.

FindProp()

Synopsis

struct StoredProperty * FindProp(
         struct IFFHandle * iff,
         LONG type,
         LONG id );

Function

Searches for a StoredProperty that is valid in the given context.
Property chunks are automatically stored by ParseIFF() when pre-declared
by PropChunk() or PropChunks(). The returned storedproperty contains
a pointer to the data in the chunk.

Inputs

iff    - a pointer to a an IFFHandle struct.
type  - type code of property to search for.
id    -  id code of property to search for.

Result

sp    - pointer to a storedproperty if found, NULL if none are found.

FindPropContext()

Synopsis

struct ContextNode * FindPropContext(
         struct IFFHandle * iff );

Function

Finds the proper context in which to store a property.
If we have installed a property entry handler via PropChunk()
and such a property chunk (for example id is "CMAP" and type is "ILBM"
inside a form, then the storedproperty will be stored in the enclosing
FORM chink. If the chunk was inside a PROP chunk inside a LIST, then
the storedproperty would be installed in the LIST context.

Inputs

iff - pointer to IFFHandle struct.

Result

cn  -  pointer to contextnode where the property might be installed, or
      NULL if no such context exists.

Notes

This function is most for internal use.

FreeIFF()

Synopsis

void FreeIFF(
         struct IFFHandle * iff );

Function

Frees an IFFHandle struct previously allocated by AllocIFF.

Inputs

iff - pointer to an IFFHandle struct.

FreeLocalItem()

Synopsis

void FreeLocalItem(
         struct LocalContextItem * localItem );

Function

Frees a local context item previously allocated by AllocLocalItem.
This functioned should always be calles by custom LCI purge hooks.

Inputs

localItem    -  pointer to LocalContextItem struct.

GoodID()

Synopsis

LONG GoodID(
         LONG id );

Function

Determines whether an ID is valid according to the IFF specification.

Inputs

id - An IFF chunk ID to be tested.

Result

TRUE if valid.
FALSE otherwise.

Notes

Assumes input to be in local byte order.

GoodType()

Synopsis

LONG GoodType(
         LONG type );

Function

Determines whether a IFF chunk type is valid according to the IFF specification.

Inputs

type  - An IFF chunk type to be tested.

Result

TRUE  - type is valid.
FALSE  -  otherwise.

Notes

Assumes the input type to be in local byte order.

IDtoStr()

Synopsis

STRPTR IDtoStr(
         LONG id,
         STRPTR buf );

Inputs

id  - pointer to an IFF chunk identfication code.
buf  -  buffer into which the id will be stored. Should at least be 5 bytes.

Result

buf  -  pointer to the supplied buffer.

Example

// Print the ID of the current contextnode

UBYTE buf[5];
struct ContextNode *cn;

if (cn = CurrentChunk(iff)
    printf
    (
        "ID of current chunk: %s\n",
        IDtoStr(cn->cn_ID)
    );

Notes

Assumes that the supplied ID is stored in local byte order.

InitIFF()

Synopsis

void InitIFF(
         struct IFFHandle * iff,
         LONG flags,
         struct Hook      * streamHook );

Function

Initializes an IFFHandle with a custom stream handler and
flags describing seekability of the stream.

Inputs

iff         - pointer to IFFHandle struct.
flags        -  stream I/O flags for the IFFHandle.
streamHook  - pointer to a Hook structure initialized with the streamhandler
              to be called.

InitIFFasClip()

Synopsis

void InitIFFasClip(
         struct IFFHandle * iff );

Function

Initializes the given IFFHandle to be a clipboard stream. It installs a
"custom" stream handler (via InitIFF) to handle clipboard streams.
The iff_Stream field of the iffhandle will still need
to be initializes with a ClipboardHandle struct returned from
OpenClipboard().

Inputs

iff  - pointer to an IFFHandle struct.

InitIFFasDOS()

Synopsis

void InitIFFasDOS(
         struct IFFHandle * iff );

Function

Initializes the given IFFHandle to be a DOS stream. It installs a
"custom" stream handler (via InitIFF) to handle DOS streams.
The iff_Stream field of the iffhandle will still need
to be initializes with a filehandle struct as returned from
dos.library/Open(). The iff_Flags may be changed to
change the seekability of the stream after this function is called,
but before OpenIFF() is called. Seekability for dos files
default to IFFF_RSEEK (random seekable).

Inputs

iff  - pointer to an IFFHandle struct.

LocalItemData()

Synopsis

APTR LocalItemData(
         struct LocalContextItem * localItem );

Function

Returns a  pointer to the userdata allocated in AllocLocalItem.
This function returns NULL for an input of NULL.

Inputs

localItem - pointer to a LocalContextItem struct or NULL.

Result

data      - pointer to user data or NULL.

OpenClipboard()

Synopsis

struct ClipboardHandle * OpenClipboard(
         LONG unitNumber );

Function

Opens the clipboard.device with the specified unit.
Allocates and initializes a ClipboardHandle struct which should
be put into the iff_Stream field of the IFFHandle when the
handle is initialized with InitIFFasClip().

Inputs

unitNumber  - a clipboard device unit number (usually PRIMARY_CLIP).

Result

ch          -  pointer to ClipboarHandle struct or NULL if unsuccessfull.

OpenIFF()

Synopsis

LONG OpenIFF(
         struct IFFHandle * iff,
         LONG rwMode );

Function

Initializes an IFFHandle struct for a new session of reading or
writing. The direction of the I/O is determined by the rwMode flags
supplied (IFFF_READ or IFFF_WRITE).

Inputs

iff - pointer to IFFHandle struct.
ewMode - IFFF_READ or IFFF_WRITE

Result

error -  0 if successfull, IFFERR_#? elsewise.

Notes

 This function tells the custom stream handler to initialize
by sending it a IFFCMD_INIT IFFStreamCmd.

ParentChunk()

Synopsis

struct ContextNode * ParentChunk(
         struct ContextNode * contextNode );

Function

Returns a pointer to the parent context node to the given
one on the context node stack. The parent context node
represents the chunk enclosing the chunk given.
This can be use together with CurrentChunk() to iterate the
context node stack top-down.

Inputs

contextNode  - pointer to a context node.

Result

parent      -  pointer to the parent context node or NULL if none.

ParseIFF()

Synopsis

LONG ParseIFF(
         struct IFFHandle * iff,
         LONG mode );

Function

This function is the parser itself. It has three control modes.
    IFFPARSE_SCAN - the parser will go through the file invoking
        entry and exit handlers on its way.
        When it returns it might be for 3 different reasons:

        - It invoked a Stop entry/exit handler ( Installed by StopChunk[s] or
          StopOnExit )

        - An error occured.
          (return value will be negative.)

        - The parser reached EOF and returns IFFERR_EOF.

    IFFPARSE_STEP  -  The parser steps through the file, returning to the
        user each time it enters (returns NULL) and each time it exits
        (return (IFFERR_EOC) a chunk.
        It will also invoke entry/exit - handlers.

    IFFPARSE_RAWSTEP - same as IFFPARSE_STEP except that in this mode
        the parse won't invoke any handlers.

Inputs

iff - pointer to IFFHandle struct.
mode - IFFPARSE_SCAN, IFFPARSE_STEP or IFFPARSE_RAWSTEP.

Result

0 if successfull or IFFERR_#?

See also

PushChunk() PopChunk() EntryHandler() ExitHandler() PropChunk[s]() CollectionChunk[s]() StopChunk[s]() StopOnExit()


PopChunk()

Synopsis

LONG PopChunk(
         struct IFFHandle * iff );

Function

Pops a context node of the context stack. Usually called
in write mode to signal the end of a chunk.

Inputs

iff    - pointer to IFFHandle struct.

Result

error  -  0 if successfull, IFFERR_#? otherwise.

PropChunk()

Synopsis

LONG PropChunk(
         struct IFFHandle * iff,
         LONG type,
         LONG id );

Function

Installs an entry handler for chunks with the given type and id.
When such  chunk is encoutered, the entry handler will insert
a StoredProperty in the proper context.
A stored property chunk returned by FindProp() will be the valid property
for the current context.

Inputs

iff    - pointer to IFFHandle struct.
type  -  type code for chunk to declare.
id    -  identifier for chunk to declare.

Result

error  - 0 if successfull, IFFERR_#? otherwise.

PropChunks()

Synopsis

LONG PropChunks(
         struct IFFHandle * iff,
         const LONG       * propArray,
         LONG numPairs );

Function

Does multiple PropChunk() calls on the supplied list.
An easy way to install several prop chunk handlers

Inputs

iff       - pointer to an IFFHandle struct.
propArray  - pointer to an array of longword chunk types and identifiers.
numPairs  - number of type/id pairs in the propArray.

Result

error      - 0 if successfull, IFFERR_#? otherwise.

PushChunk()

Synopsis

LONG PushChunk(
         struct IFFHandle * iff,
         LONG type,
         LONG id,
         LONG size );

Function

Pushes a new context node onto the context stack. Usually used in write mode.
In write mode the contextnode will be pushed with the given parameters.
In Read mode the type, id and size will be read from the installed stream.
Note that IFFSIZE_UNKNOW can be given for size in write mode. In that case,
the size of will not be known until you do a PopChunk(). PopChunk()
will then seek back in the stream and write the correct size.

Inputs

iff    - pointer to IFFHandle struct.
type  -  chunk type specifier.
id    -  chunk identifier.
size  -  size of the new chunk. May be IFFSIZE_UNKNOWN.

Result

error  -  0 if successfull, IFFERR_#? otherwize.

ReadChunkBytes()

Synopsis

LONG ReadChunkBytes(
         struct IFFHandle * iff,
         APTR buf,
         LONG numBytes );

Function

Read a number of bytes from the current chunk into a buffer.
Attempts to read past the end of the chunk will be truncated.

Inputs

iff      - pointer to IFFHandle struct.
buf      -  pointer to a buffer into which the data will be placed.
numBtes  - number of bytes to read.

Result

actual -   (positive) the actual number of bytes read.
          (negative) IFFERR_#? error code if not succesfull.

ReadChunkRecords()

Synopsis

LONG ReadChunkRecords(
         struct IFFHandle * iff,
         APTR buf,
         LONG bytesPerRecord,
         LONG numRecords );

Function

Read a number of records with the given size from the current chunk
into a buffer. Attempts to read past the end of the chunk will be truncated.

Inputs

 iff              - pointer to IFFHandle struct.
buf              -  pointer to a buffer into which the data will be placed.
bytesPerRecord  - number of bytes per record.
numRecords      -  number of records to read.

Result

actual -   (positive) the actual number of whole records read.
          (negative) IFFERR_#? error code if not succesfull.

SetLocalItemPurge()

Synopsis

void SetLocalItemPurge(
         struct LocalContextItem * localItem,
         struct Hook             * purgeHook );

Function

Inserts a custom purge hook for the given local context item.
The purge hook will be freed when the system wants to delete a local
context item.

Inputs

localItem  -  pointer to a local context item.
purgeHook  -  pointer to a hook sructure initialized with the purge function.

Notes

The purgehook must call FreeLocalItem() on the local context item after
doing its own resource freeing.

StopChunk()

Synopsis

LONG StopChunk(
         struct IFFHandle * iff,
         LONG type,
         LONG id );

Function

Inserts an entry handler for the given type and id, that will cause the parser
to stop when such a chunk is entered.

Inputs

 iff   - Pointer to IFFHandle struct. (does not need to be open).
type  - IFF chunk type declarator for chunk to stop at.
id    -  IFF chunk id identifier for chunk to stop at.

Result

error  -  0 if successfull, IFFERR_#? otherwise.

StopChunks()

Synopsis

LONG StopChunks(
         struct IFFHandle * iff,
         const LONG       * propArray,
         LONG numPairs );

Function

Declares multiple stop chunks from th typ/id pairs supplied.

Inputs

iff       - pointer to an IFFHandle struct.
  propArray  - pointer to an array of longword chunk types and identifiers.
  numPairs  - number of type/id pairs in the propArray.

Result

error      - 0 if successfull, IFFERR_#? otherwise.

StopOnExit()

Synopsis

LONG StopOnExit(
         struct IFFHandle * iff,
         LONG type,
         LONG id );

Function

Inserts an exit handler for the given type and id, that will cause the parser
to stop when such a chunk is left.

Inputs

 iff   - Pointer to IFFHandle struct. (does not need to be open).
type  - IFF chunk type declarator for chunk to stop at.
id    -  IFF chunk id identifier for chunk to stop at.

Result

error  -  0 if successfull, IFFERR_#? otherwise.

StoreItemInContext()

Synopsis

void StoreItemInContext(
         struct IFFHandle        * iff,
         struct LocalContextItem * localItem,
         struct ContextNode      * contextNode );

Function

Stores the given local context item into the given context node.
If a LCI with the some id, type and class identifier allready exists
in the context node, the old one will be purged, and the new one
inserted.

Inputs

iff         - pointer to IFFHandle struct.
localItem    -  pointer to LCI to install.
contextNode  -  pointer to the context node in which the LCI will be stored.

StoreLocalItem()

Synopsis

LONG StoreLocalItem(
         struct IFFHandle        * iff,
         struct LocalContextItem * localItem,
         LONG position );

Function

Stores the given local context item in a context node.
Which context node this is depends on the value of the position
argument:
    IFFSLI_ROOT - insert into the default contextnode.
    IFFSLI_PROP  -  insert into the node returned by FindPropContext().
    IFFSLI_TOP  -  insert item into the current contextnode.

Inputs

iff        - pointer to IFFHandle struct.
localItem  -  pointer to local context item.
position  -  IFFSLI_ROOT, IFFSLI_PROP or IFFSLI_TOP.

Result

error     -  0 if succesfull, IFFERR_#? otherwise.

WriteChunkBytes()

Synopsis

LONG WriteChunkBytes(
         struct IFFHandle * iff,
         APTR buf,
         LONG numBytes );

Function

Writes given number of bytes in the supplied buffer into the
current chunk. Attempts to write past the endo of the chunk will
be truncated.

Inputs

iff        - pointer to IFFHandle struct.
buf        -  buffer with data to write.
numBytes  - number of bytes to write.

Result

actual    -  (positive) number of bytes actually written.
            (negative) IFFERR_#? indicating unsuccesfull write.

WriteChunkRecords()

Synopsis

LONG WriteChunkRecords(
         struct IFFHandle * iff,
         APTR buf,
         LONG bytesPerRecord,
         LONG numRecords );

Function

Write numRecods records of bytesPerRecord bytes to the current chunk.
Attempts to write past the end of the chunk will be truncated.

Inputs

 iff              - pointer to IFFHandle struct.
buf              -  pointer to a buffer containig the data to be written.
bytesPerRecord  - number of bytes per record.
numRecords      -  number of records to write.

Result

actual -   (positive) the actual number of whole records written.
          (negative) IFFERR_#? error code if not succesfull.

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