Retro68/hfsutils/librsrc/rsrc.c

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2012-03-29 08:28:43 +00:00
/*
* librsrc - library for reading and writing Macintosh resources
* Copyright (C) 1996-1998 Robert Leslie
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: rsrc.c,v 1.7 1998/11/02 22:09:15 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include <stdlib.h>
# include <unistd.h>
# include <string.h>
# include <errno.h>
# include "librsrc.h"
# include "data.h"
const char *rsrc_error = "no error"; /* static error string */
/*
* NAME: rsrc->init()
* DESCRIPTION: initialize access to a resource file
*/
rsrcfile *rsrc_init(void *priv, const struct rsrcprocs *procs)
{
rsrcfile *rfile;
byte head[16];
const byte *ptr = head;
unsigned long nbytes;
unsigned short tlistoff, nlistoff;
rfile = ALLOC(rsrcfile, 1);
if (rfile == 0)
ERROR(ENOMEM, 0);
rfile->priv = priv;
rfile->procs = *procs;
rfile->map.data = 0;
if (rfile->procs.seek(rfile->priv, 0, RSRC_SEEK_SET) == (unsigned long) -1)
ERROR(errno, "error seeking resource header");
nbytes = rfile->procs.read(rfile->priv, head, sizeof(head));
if (nbytes != sizeof(head))
{
if (nbytes == (unsigned long) -1)
ERROR(errno, "error reading resource header");
else
ERROR(EINVAL, "truncated resource header");
}
d_fetchul(&ptr, &rfile->hdr.dstart);
d_fetchul(&ptr, &rfile->hdr.mstart);
d_fetchul(&ptr, &rfile->hdr.dlen);
d_fetchul(&ptr, &rfile->hdr.mlen);
rfile->map.data = ALLOC(byte, rfile->hdr.mlen);
if (rfile->map.data == 0)
ERROR(ENOMEM, 0);
if (rfile->procs.seek(rfile->priv, rfile->hdr.mstart, RSRC_SEEK_SET) ==
(unsigned long) -1)
ERROR(errno, "error seeking resource map");
nbytes = rfile->procs.read(rfile->priv, rfile->map.data, rfile->hdr.mlen);
if (nbytes != rfile->hdr.mlen)
{
if (nbytes == (unsigned long) -1)
ERROR(errno, "error reading resource map");
else
ERROR(EIO, "truncated resource map");
}
memcpy(rfile->map.data, head, sizeof(head));
ptr = rfile->map.data + 22;
d_fetchuw(&ptr, &rfile->map.attrs);
d_fetchuw(&ptr, &tlistoff);
d_fetchuw(&ptr, &nlistoff);
rfile->map.tlist = rfile->map.data + tlistoff;
rfile->map.nlist = rfile->map.data + nlistoff;
return rfile;
fail:
if (rfile)
FREE(rfile->map.data);
FREE(rfile);
return 0;
}
/*
* NAME: rsrc->finish()
* DESCRIPTION: terminate access to a resource file
*/
int rsrc_finish(rsrcfile *rfile)
{
FREE(rfile->map.data);
FREE(rfile);
return 0;
}
/*
* NAME: findtype()
* DESCRIPTION: locate an item in a resource type list
*/
static
const byte *findtype(rsrcmap *map, const char *type)
{
const byte *ptr;
long typeint;
short ntypes;
typeint = d_getsl((const unsigned char *) type);
ntypes = d_getsw(map->tlist);
for (ptr = map->tlist + 2; ntypes >= 0; ptr += 8, --ntypes)
{
if (d_getsl(ptr) == typeint)
break;
}
if (ntypes < 0)
ERROR(EINVAL, "resource type not found");
return ptr;
fail:
return 0;
}
/*
* NAME: rsrc->counttypes()
* DESCRIPTION: return the number of unique resource types
*/
int rsrc_counttypes(rsrcfile *rfile)
{
return d_getsw(rfile->map.tlist) + 1;
}
/*
* NAME: rsrc->count()
* DESCRIPTION: return the number of resources of a given type
*/
int rsrc_count(rsrcfile *rfile, const char *type)
{
const byte *ptr;
ptr = findtype(&rfile->map, type);
if (ptr == 0)
return 0;
return d_getsw(ptr + 4) + 1;
}
/*
* NAME: rsrc->gettype()
* DESCRIPTION: return an indexed type from the resource file
*/
void rsrc_gettype(rsrcfile *rfile, int index, char *type)
{
if (index < 1 || index > (d_getsw(rfile->map.tlist) + 1))
memset(type, 0, 5);
else
{
memcpy(type, rfile->map.tlist + 2 + 8 * (index - 1), 4);
type[4] = 0;
}
}
/*
* NAME: find()
* DESCRIPTION: generic routine to locate and return a resource
*/
static
const byte *find(rsrcmap *map, const char *type,
int (*compare)(rsrcmap *, const byte *, const void *),
const void *key)
{
const byte *ptr;
short nitems;
unsigned short rlistoff;
ptr = findtype(map, type);
if (ptr == 0)
goto fail;
ptr += 4;
d_fetchsw(&ptr, &nitems);
d_fetchuw(&ptr, &rlistoff);
for (ptr = map->tlist + rlistoff; nitems >= 0; ptr += 12, --nitems)
{
if (compare(map, ptr, key))
break;
}
if (nitems < 0)
ERROR(EINVAL, "resource not found");
return ptr;
fail:
return 0;
}
/*
* NAME: compare_id()
* DESCRIPTION: compare reference list item with numeric id
*/
static
int compare_id(rsrcmap *map, const byte *ritem, const void *key)
{
return d_getsw(ritem) == *(const int *) key;
}
/*
* NAME: compare_name()
* DESCRIPTION: compare reference list item with character name
*/
static
int compare_name(rsrcmap *map, const byte *ritem, const void *key)
{
char name[256];
const byte *nptr = map->nlist + d_getuw(ritem + 2);
memcpy(name, nptr + 1, *nptr);
name[*nptr] = 0;
return d_relstring(name, key) == 0;
}
/*
* NAME: load()
* DESCRIPTION: retrieve a resource from the resource file
*/
static
rsrchandle *load(rsrcfile *rfile, const byte *ritem)
{
unsigned long offs, nbytes, len, count;
byte data[260];
rsrchandle *rsrc = 0;
offs = d_getul(ritem + 4) & 0x00ffffff;
if (rfile->procs.seek(rfile->priv,
rfile->hdr.dstart + offs, RSRC_SEEK_SET) ==
(unsigned long) -1)
ERROR(errno, "error seeking resource data");
nbytes = rfile->procs.read(rfile->priv, data, sizeof(data));
if (nbytes < 4)
{
if (nbytes == (unsigned long) -1)
ERROR(errno, "error reading resource data");
else
ERROR(EIO, "truncated resource data");
}
len = d_getul(data);
rsrc = (rsrchandle *) ALLOC(byte, sizeof(rsrchandle) + len);
if (rsrc == 0)
ERROR(ENOMEM, 0);
count = nbytes - 4;
if (count > len)
count = len;
memcpy(rsrc->data, data + 4, count);
if (count < len)
{
nbytes = rfile->procs.read(rfile->priv, rsrc->data + count, len - count);
if (nbytes != len - count)
{
if (nbytes == (unsigned long) -1)
ERROR(errno, "error reading resource data");
else
ERROR(EIO, "truncated resource data");
}
}
rsrc->rfile = rfile;
rsrc->ritem = ritem;
rsrc->len = len;
return rsrc;
fail:
FREE(rsrc);
return 0;
}
/*
* NAME: getrdata()
* DESCRIPTION: generate application resource data pointer from resource handle
*/
static
void *getrdata(rsrchandle *rsrc)
{
return rsrc->data;
}
/*
* NAME: gethandle()
* DESCRIPTION: recover resource handle from application resource data pointer
*/
static
rsrchandle *gethandle(void *rdata)
{
rsrchandle dummy;
return (rsrchandle *) ((char *) rdata -
((char *) dummy.data - (char *) &dummy));
}
/*
* NAME: rsrc->maxsize()
* DESCRIPTION: return maximum possible size of the given resource (type/id)
*/
unsigned long rsrc_maxsize(rsrcfile *rfile, const char *type, int id)
{
const byte *ptr;
unsigned long offs1, offs2;
ptr = find(&rfile->map, type, compare_id, &id);
if (ptr == 0)
return 0;
offs1 = d_getul(ptr + 4) & 0x00ffffff;
/* ... */
offs2 = 0;
return 0;
}
/*
* NAME: rsrc->get()
* DESCRIPTION: return a resource by type/id
*/
void *rsrc_get(rsrcfile *rfile, const char *type, int id)
{
const byte *ptr;
rsrchandle *rsrc;
ptr = find(&rfile->map, type, compare_id, &id);
if (ptr == 0)
return 0;
rsrc = load(rfile, ptr);
if (rsrc == 0)
return 0;
return getrdata(rsrc);
}
/*
* NAME: rsrc->getnamed()
* DESCRIPTION: return a resource by type/name
*/
void *rsrc_getnamed(rsrcfile *rfile, const char *type, const char *name)
{
const byte *ptr;
rsrchandle *rsrc;
ptr = find(&rfile->map, type, compare_name, name);
if (ptr == 0)
return 0;
rsrc = load(rfile, ptr);
if (rsrc == 0)
return 0;
return getrdata(rsrc);
}
/*
* NAME: rsrc->getind()
* DESCRIPTION: return a resource by type/index
*/
void *rsrc_getind(rsrcfile *rfile, const char *type, int index)
{
const byte *ptr;
short nitems;
rsrchandle *rsrc;
ptr = findtype(&rfile->map, type);
if (ptr == 0)
goto fail;
nitems = d_getsw(ptr + 4) + 1;
if (index < 1 || index > nitems)
ERROR(EINVAL, "index out of range");
rsrc = load(rfile, rfile->map.tlist + d_getsw(ptr + 6) + 12 * (index - 1));
if (rsrc == 0)
goto fail;
return getrdata(rsrc);
fail:
return 0;
}
/*
* NAME: rsrc->size()
* DESCRIPTION: return the length of a resource in bytes
*/
unsigned long rsrc_size(void *rdata)
{
rsrchandle *rsrc = gethandle(rdata);
return rsrc->len;
}
/*
* NAME: rsrc->resize()
* DESCRIPTION: change the length of a resource
*/
void *rsrc_resize(void *rdata, unsigned long newsize)
{
rsrchandle *newrsrc, *rsrc = gethandle(rdata);
if (rsrc->len == newsize)
goto done;
newrsrc = (rsrchandle *) REALLOC(rsrc, byte, sizeof(rsrchandle) + newsize);
if (newrsrc == 0)
ERROR(ENOMEM, 0);
newrsrc->attrs |= RSRC_RES_CHANGED;
newrsrc->len = newsize;
rdata = getrdata(newrsrc);
done:
return rdata;
fail:
return 0;
}
/*
* NAME: rsrc->changed()
* DESCRIPTION: indicate a changed resource which must be rewritten to disk
*/
void rsrc_changed(void *rdata)
{
rsrchandle *rsrc = gethandle(rdata);
rsrc->attrs |= RSRC_RES_CHANGED;
}
/*
* NAME: rsrc->release()
* DESCRIPTION: dispose memory used by a resource
*/
void rsrc_release(void *rdata)
{
rsrchandle *rsrc = gethandle(rdata);
if (rsrc->attrs & RSRC_RES_CHANGED)
{
/* ... */
}
FREE(rsrc);
}