2a721c7489
Plan is to convert COLLADA XML into IFF, for faster, more compact and easier to read and parse files. Reading/writing code is a few hundred lines of code, instead of COLLADA-DOM and libxml combo. So it would be suitable as a run-time format for platforms ranging from iPhone to PlayStation 3. Relevant physics data (and perhaps other data) will be converted from COLLADA -> IFF. We could call the resulting files COLLADA binary IFF -> CLIFF.
378 lines
11 KiB
C
378 lines
11 KiB
C
/*----------------------------------------------------------------------*
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* IFFR.C Support routines for reading IFF-85 files. 11/15/85
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* (IFF is Interchange Format File.)
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*
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* By Jerry Morrison and Steve Shaw, Electronic Arts.
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* This software is in the public domain.
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*
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* Original version was for the Commodore-Amiga computer.
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/* This version is compatible with PC, OSX, PS3, Wii, iPhone. 10/26/2008
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*----------------------------------------------------------------------*/
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#include "iff.h"
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/* #include "DF1:iff/gio.h" */
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/* #define OFFSET_BEGINNING OFFSET_BEGINING */
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/** Manx expects INTs as 16 bits, This wont matter on LAttice ***/
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/* ---------- Read -----------------------------------------------------*/
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extern LONG PutID(); /** Added as a diagnostic aid, will remove later ***/
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/* ---------- OpenRIFF --------------------------------------------------*/
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IFFP OpenRIFF(file0, new0, clientFrame)
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BPTR file0; GroupContext *new0; ClientFrame *clientFrame; {
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register BPTR file = file0;
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register GroupContext *new = new0;
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IFFP iffp = IFF_OKAY;
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new->parent = NL; /* "whole file" has no parent.*/
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new->clientFrame = clientFrame;
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new->file = file;
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new->position = 0;
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new->ckHdr.ckID = new->subtype = NULL_CHUNK;
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new->ckHdr.ckSize = new->bytesSoFar = 0;
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/* Set new->bound. AmigaDOS specific code.*/
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if (file <= 0) return(NO_FILE);
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Seek(file, 0L, OFFSET_END); /* Seek to end of file.*/
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new->bound = ftell(file);//Seek(file, 0L, OFFSET_CURRENT); /* Pos'n == #bytes in file.*/
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if (new->bound < 0) return(DOS_ERROR); /* DOS being absurd.*/
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Seek(file, 0L, OFFSET_BEGINNING); /* Go to file start.*/
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/* Would just do this if Amiga DOS maintained fh_End: */
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/* new->bound = (FileHandle *)BADDR(file)->fh_End; */
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if ( new->bound < (long)sizeof(ChunkHeader) )
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iffp = NOT_IFF;
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return(iffp);
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}
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/* ---------- OpenRGroup -----------------------------------------------*/
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IFFP OpenRGroup(parent0, new0) GroupContext *parent0, *new0; {
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register GroupContext *parent = parent0;
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register GroupContext *new = new0;
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IFFP iffp = IFF_OKAY;
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new->parent = parent;
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new->clientFrame = parent->clientFrame;
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new->file = parent->file;
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new->position = parent->position;
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new->bound = parent->position + ChunkMoreBytes(parent);
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new->ckHdr.ckID = new->subtype = NULL_CHUNK;
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new->ckHdr.ckSize = new->bytesSoFar = 0;
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if ( new->bound > parent->bound || IS_ODD(new->bound) )
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iffp = BAD_IFF;
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return(iffp);
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}
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/* ---------- CloseRGroup -----------------------------------------------*/
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IFFP CloseRGroup(context) GroupContext *context; {
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register LONG position;
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if (context->parent == NL) {
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} /* Context for whole file.*/
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else {
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position = context->position;
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context->parent->bytesSoFar += position - context->parent->position;
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context->parent->position = position;
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}
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return(IFF_OKAY);
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}
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/* ---------- SkipFwd --------------------------------------------------*/
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/* Skip over bytes in a context. Won't go backwards.*/
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/* Updates context->position but not context->bytesSoFar.*/
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/* This implementation is AmigaDOS specific.*/
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IFFP SkipFwd(context, bytes)
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GroupContext *context;
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LONG bytes;
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{
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IFFP iffp = IFF_OKAY;
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if (bytes > 0) {
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if (-1 == Seek(context->file, bytes, OFFSET_CURRENT))
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iffp = BAD_IFF; /* Ran out of bytes before chunk complete.*/
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else
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context->position += bytes;
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}
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return(iffp);
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}
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short int endianSwap16(short int val)
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{
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long int i = 1;
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const char *p = (const char *) &i;
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if (p[0] == 1) // Lowest address contains the least significant byte
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{
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return (((val & 0xff00) >> 8) | ((val & 0x00ff) << 8));
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}
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return val;
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}
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int endianSwap32(int val)
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{
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long int i = 1;
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const char *p = (const char *) &i;
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if (p[0] == 1) // Lowest address contains the least significant byte
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{
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return (((val & 0xff000000) >> 24) | ((val & 0x00ff0000) >> 8) | ((val & 0x0000ff00) << 8) | ((val & 0x000000ff) << 24));
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}
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return val;
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}
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/* ---------- GetChunkHdr ----------------------------------------------*/
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ID GetChunkHdr(GroupContext *context0)
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{
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register GroupContext *context = context0;
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register IFFP iffp;
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LONG remaining;
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/* Skip remainder of previous chunk & padding. */
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iffp = SkipFwd(context,
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ChunkMoreBytes(context) + IS_ODD(context->ckHdr.ckSize));
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CheckIFFP();
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/* Set up to read the new header. */
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context->ckHdr.ckID = BAD_IFF; /* Until we know it's okay, mark it BAD.*/
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context->subtype = NULL_CHUNK;
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context->bytesSoFar = 0;
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/* Generate a psuedo-chunk if at end-of-context. */
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remaining = context->bound - context->position;
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if (remaining == 0 ) {
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context->ckHdr.ckSize = 0;
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context->ckHdr.ckID = END_MARK;
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}
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/* BAD_IFF if not enough bytes in the context for a ChunkHeader.*/
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else if ((long)sizeof(ChunkHeader) > remaining) {
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context->ckHdr.ckSize = remaining;
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}
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/* Read the chunk header (finally). */
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else {
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switch (Read(context->file,
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&context->ckHdr, (long)sizeof(ChunkHeader)))
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{
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case -1: return(context->ckHdr.ckID = DOS_ERROR);
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case 0: return(context->ckHdr.ckID = BAD_IFF);
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}
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//swap endian-ness of ckSize on little endian machines
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context->ckHdr.ckSize = endianSwap32(context->ckHdr.ckSize);
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/*** $$$ ***
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PutID(context->ckHdr.ckID);
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printf("\n");
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printf("id = %lx\n", context->ckHdr.ckID);
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**/
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/* Check: Top level chunk must be LIST or FORM or CAT. */
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if (context->parent == NL) {
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if (context->ckHdr.ckID != FORM &&
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context->ckHdr.ckID != LIST &&
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context->ckHdr.ckID != CAT )
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return(context->ckHdr.ckID = NOT_IFF);
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}
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/* Update the context. */
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context->position += (long)sizeof(ChunkHeader);
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remaining -= (long)sizeof(ChunkHeader);
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/* Non-positive ID values are illegal and used for error codes.*/
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/* We could check for other illegal IDs...*/
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if (context->ckHdr.ckID <= 0 )
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context->ckHdr.ckID = BAD_IFF;
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/* Check: ckSize negative or larger than # bytes left in context? */
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else if (context->ckHdr.ckSize < 0 ||
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context->ckHdr.ckSize > remaining) {
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context->ckHdr.ckSize = remaining;
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context->ckHdr.ckID = BAD_IFF;
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}
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/* Automatically read the LIST, FORM, PROP, or CAT subtype ID */
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else {
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if (context->ckHdr.ckID == LIST ||
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context->ckHdr.ckID == FORM ||
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context->ckHdr.ckID == PROP ||
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context->ckHdr.ckID == CAT) {
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iffp = IFFReadBytes(context, (BYTE *)&context->subtype,
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(long)sizeof(ID));
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if (iffp != IFF_OKAY )
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context->ckHdr.ckID = iffp;
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}
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}
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}
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return(context->ckHdr.ckID);
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}
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/* ---------- IFFReadBytes ---------------------------------------------*/
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IFFP IFFReadBytes(context, buffer, nBytes)
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GroupContext *context;
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BYTE *buffer;
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LONG nBytes;
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{
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register IFFP iffp = IFF_OKAY;
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if (nBytes < 0)
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iffp = CLIENT_ERROR;
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else if (nBytes > ChunkMoreBytes(context))
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iffp = SHORT_CHUNK;
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else if (nBytes > 0 )
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switch ( Read(context->file, buffer, nBytes) ) {
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case -1: {iffp = DOS_ERROR; break; }
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case 0: {iffp = BAD_IFF; break; }
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default: {
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context->position += nBytes;
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context->bytesSoFar += nBytes;
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}
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}
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return(iffp);
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}
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/* ---------- SkipGroup ------------------------------------------------*/
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IFFP SkipGroup( GroupContext* context)
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{
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return 0;
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} /* Nothing to do, thanks to GetChunkHdr */
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/* ---------- ReadIFF --------------------------------------------------*/
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IFFP ReadIFF(file, clientFrame)
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BPTR file;
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ClientFrame *clientFrame;
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{
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/*CompilerBug register*/ IFFP iffp;
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GroupContext context;
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iffp = OpenRIFF(file, &context);
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context.clientFrame = clientFrame;
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if (iffp == IFF_OKAY) {
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iffp = GetChunkHdr(&context);
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if (iffp == FORM)
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iffp = (*clientFrame->getForm)(&context);
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else if (iffp == LIST)
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iffp = (*clientFrame->getList)(&context);
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else if (iffp == CAT)
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iffp = (*clientFrame->getCat)(&context);
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}
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CloseRGroup(&context);
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if (iffp > 0 ) /* Make sure we don't return an ID.*/
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iffp = NOT_IFF; /* GetChunkHdr should've caught this.*/
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return(iffp);
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}
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/* ---------- ReadIList ------------------------------------------------*/
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IFFP ReadIList(parent, clientFrame)
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GroupContext *parent;
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ClientFrame *clientFrame;
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{
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GroupContext listContext;
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IFFP iffp;
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BOOL propOk = TRUE;
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iffp = OpenRGroup(parent, &listContext);
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CheckIFFP();
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/* One special case test lets us handle CATs as well as LISTs.*/
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if (parent->ckHdr.ckID == CAT)
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propOk = FALSE;
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else
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listContext.clientFrame = clientFrame;
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do {
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iffp = GetChunkHdr(&listContext);
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if (iffp == PROP) {
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if (propOk)
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iffp = (*clientFrame->getProp)(&listContext);
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else
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iffp = BAD_IFF;
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}
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else if (iffp == FORM)
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iffp = (*clientFrame->getForm)(&listContext);
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else if (iffp == LIST)
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iffp = (*clientFrame->getList)(&listContext);
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else if (iffp == CAT)
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iffp = (*clientFrame->getList)(&listContext);
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if (listContext.ckHdr.ckID != PROP)
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propOk = FALSE; /* No PROPs allowed after this point.*/
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} while (iffp == IFF_OKAY);
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CloseRGroup(&listContext);
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if (iffp > 0 ) /* Only chunk types above are allowed in a LIST/CAT.*/
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iffp = BAD_IFF;
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return(iffp == END_MARK ? IFF_OKAY : iffp);
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}
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/* ---------- ReadICat -------------------------------------------------*/
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/* By special arrangement with the ReadIList implement'n, this is trivial.*/
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IFFP ReadICat(parent) GroupContext *parent; {
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return( ReadIList(parent, parent->clientFrame));//NL) );
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}
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/* ---------- GetFChunkHdr ---------------------------------------------*/
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ID GetFChunkHdr(context)
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GroupContext *context;
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{
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register ID id;
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id = GetChunkHdr(context);
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if (id == PROP)
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context->ckHdr.ckID = id = BAD_IFF;
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return(id);
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}
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/* ---------- GetF1ChunkHdr ---------------------------------------------*/
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ID GetF1ChunkHdr(context) GroupContext *context; {
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register ID id;
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register ClientFrame *clientFrame = context->clientFrame;
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id = GetChunkHdr(context);
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if (id == PROP)
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id = BAD_IFF;
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else if (id == FORM)
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id = (*clientFrame->getForm)(context);
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else if (id == LIST)
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id = (*clientFrame->getForm)(context);
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else if (id == CAT)
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id = (*clientFrame->getCat)(context);
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return(context->ckHdr.ckID = id);
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}
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/* ---------- GetPChunkHdr ---------------------------------------------*/
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ID GetPChunkHdr(context)
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GroupContext *context;
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{
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register ID id;
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id = GetChunkHdr(context);
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if (id == LIST || id == FORM || id == PROP || id == CAT )
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id = context->ckHdr.ckID = BAD_IFF;
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return(id);
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}
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