448 lines
9.3 KiB
C
448 lines
9.3 KiB
C
/*
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "MEM_guardedalloc.h"
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#include "BLI_fileops.h"
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#include "BLI_string.h"
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#include "BKE_customdata_file.h"
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#include "BKE_global.h"
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#include "BKE_utildefines.h"
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/************************* File Format Definitions ***************************/
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#define CDF_ENDIAN_LITTLE 0
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#define CDF_ENDIAN_BIG 1
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#define CDF_DATA_FLOAT 0
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typedef struct CDataFileHeader {
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char ID[4]; /* "BCDF" */
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char endian; /* little, big */
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char version; /* non-compatible versions */
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char subversion; /* compatible sub versions */
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char pad; /* padding */
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int structbytes; /* size of this struct in bytes */
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int type; /* image, mesh */
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int totlayer; /* number of layers in the file */
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} CDataFileHeader;
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typedef struct CDataFileImageHeader {
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int structbytes; /* size of this struct in bytes */
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int width; /* image width */
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int height; /* image height */
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int tile_size; /* tile size (required power of 2) */
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} CDataFileImageHeader;
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typedef struct CDataFileMeshHeader {
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int structbytes; /* size of this struct in bytes */
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} CDataFileMeshHeader;
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struct CDataFileLayer {
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int structbytes; /* size of this struct in bytes */
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int datatype; /* only float for now */
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uint64_t datasize; /* size of data in layer */
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int type; /* layer type */
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char name[CDF_LAYER_NAME_MAX]; /* layer name */
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};
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/**************************** Other Definitions ******************************/
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#define CDF_VERSION 0
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#define CDF_SUBVERSION 0
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#define CDF_TILE_SIZE 64
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struct CDataFile {
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int type;
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CDataFileHeader header;
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union {
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CDataFileImageHeader image;
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CDataFileMeshHeader mesh;
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} btype;
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CDataFileLayer *layer;
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int totlayer;
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FILE *readf;
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FILE *writef;
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int switchendian;
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size_t dataoffset;
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};
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/********************************* Create/Free *******************************/
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static int cdf_endian(void)
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{
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if(ENDIAN_ORDER == L_ENDIAN)
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return CDF_ENDIAN_LITTLE;
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else
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return CDF_ENDIAN_BIG;
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}
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/*static int cdf_data_type_size(int datatype)
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{
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if(datatype == CDF_DATA_FLOAT)
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return sizeof(float);
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return 0;
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}*/
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CDataFile *cdf_create(int type)
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{
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CDataFile *cdf= MEM_callocN(sizeof(CDataFile), "CDataFile");
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cdf->type= type;
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return cdf;
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}
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void cdf_free(CDataFile *cdf)
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{
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cdf_read_close(cdf);
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cdf_write_close(cdf);
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if(cdf->layer)
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MEM_freeN(cdf->layer);
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MEM_freeN(cdf);
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}
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/********************************* Read/Write ********************************/
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static int cdf_read_header(CDataFile *cdf)
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{
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CDataFileHeader *header;
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CDataFileImageHeader *image;
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CDataFileMeshHeader *mesh;
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CDataFileLayer *layer;
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FILE *f= cdf->readf;
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size_t offset = 0;
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int a;
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header= &cdf->header;
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if(!fread(header, sizeof(CDataFileHeader), 1, cdf->readf))
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return 0;
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if(memcmp(header->ID, "BCDF", sizeof(header->ID)) != 0)
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return 0;
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if(header->version > CDF_VERSION)
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return 0;
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cdf->switchendian= header->endian != cdf_endian();
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header->endian= cdf_endian();
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if(cdf->switchendian) {
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SWITCH_INT(header->type);
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SWITCH_INT(header->totlayer);
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SWITCH_INT(header->structbytes);
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}
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if(!ELEM(header->type, CDF_TYPE_IMAGE, CDF_TYPE_MESH))
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return 0;
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offset += header->structbytes;
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header->structbytes= sizeof(CDataFileHeader);
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if(fseek(f, offset, SEEK_SET) != 0)
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return 0;
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if(header->type == CDF_TYPE_IMAGE) {
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image= &cdf->btype.image;
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if(!fread(image, sizeof(CDataFileImageHeader), 1, f))
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return 0;
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if(cdf->switchendian) {
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SWITCH_INT(image->width);
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SWITCH_INT(image->height);
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SWITCH_INT(image->tile_size);
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SWITCH_INT(image->structbytes);
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}
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offset += image->structbytes;
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image->structbytes= sizeof(CDataFileImageHeader);
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}
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else if(header->type == CDF_TYPE_MESH) {
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mesh= &cdf->btype.mesh;
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if(!fread(mesh, sizeof(CDataFileMeshHeader), 1, f))
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return 0;
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if(cdf->switchendian)
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SWITCH_INT(mesh->structbytes);
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offset += mesh->structbytes;
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mesh->structbytes= sizeof(CDataFileMeshHeader);
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}
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if(fseek(f, offset, SEEK_SET) != 0)
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return 0;
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cdf->layer= MEM_callocN(sizeof(CDataFileLayer)*header->totlayer, "CDataFileLayer");
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cdf->totlayer= header->totlayer;
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for(a=0; a<header->totlayer; a++) {
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layer= &cdf->layer[a];
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if(!fread(layer, sizeof(CDataFileLayer), 1, f))
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return 0;
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if(cdf->switchendian) {
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SWITCH_INT(layer->type);
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SWITCH_INT(layer->datatype);
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SWITCH_INT64(layer->datasize);
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SWITCH_INT(layer->structbytes);
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}
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if(layer->datatype != CDF_DATA_FLOAT)
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return 0;
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offset += layer->structbytes;
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layer->structbytes= sizeof(CDataFileLayer);
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if(fseek(f, offset, SEEK_SET) != 0)
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return 0;
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}
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cdf->dataoffset= offset;
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return 1;
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}
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static int cdf_write_header(CDataFile *cdf)
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{
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CDataFileHeader *header;
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CDataFileImageHeader *image;
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CDataFileMeshHeader *mesh;
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CDataFileLayer *layer;
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FILE *f= cdf->writef;
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int a;
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header= &cdf->header;
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if(!fwrite(header, sizeof(CDataFileHeader), 1, f))
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return 0;
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if(header->type == CDF_TYPE_IMAGE) {
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image= &cdf->btype.image;
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if(!fwrite(image, sizeof(CDataFileImageHeader), 1, f))
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return 0;
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}
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else if(header->type == CDF_TYPE_MESH) {
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mesh= &cdf->btype.mesh;
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if(!fwrite(mesh, sizeof(CDataFileMeshHeader), 1, f))
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return 0;
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}
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for(a=0; a<header->totlayer; a++) {
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layer= &cdf->layer[a];
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if(!fwrite(layer, sizeof(CDataFileLayer), 1, f))
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return 0;
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}
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return 1;
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}
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int cdf_read_open(CDataFile *cdf, char *filename)
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{
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FILE *f;
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f= fopen(filename, "rb");
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if(!f)
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return 0;
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cdf->readf= f;
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if(!cdf_read_header(cdf)) {
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cdf_read_close(cdf);
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return 0;
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}
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if(cdf->header.type != cdf->type) {
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cdf_read_close(cdf);
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return 0;
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}
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return 1;
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}
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int cdf_read_layer(CDataFile *cdf, CDataFileLayer *blay)
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{
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size_t offset;
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int a;
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/* seek to right location in file */
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offset= cdf->dataoffset;
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for(a=0; a<cdf->totlayer; a++) {
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if(&cdf->layer[a] == blay)
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break;
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else
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offset += cdf->layer[a].datasize;
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}
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return (fseek(cdf->readf, offset, SEEK_SET) == 0);
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}
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int cdf_read_data(CDataFile *cdf, int size, void *data)
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{
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float *fdata;
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int a;
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/* read data */
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if(!fread(data, size, 1, cdf->readf))
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return 0;
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/* switch endian if necessary */
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if(cdf->switchendian) {
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fdata= data;
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for(a=0; a<size/sizeof(float); a++)
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SWITCH_INT(fdata[a])
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}
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return 1;
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}
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void cdf_read_close(CDataFile *cdf)
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{
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if(cdf->readf) {
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fclose(cdf->readf);
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cdf->readf= NULL;
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}
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}
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int cdf_write_open(CDataFile *cdf, char *filename)
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{
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CDataFileHeader *header;
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CDataFileImageHeader *image;
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CDataFileMeshHeader *mesh;
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FILE *f;
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f= fopen(filename, "wb");
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if(!f)
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return 0;
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cdf->writef= f;
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/* fill header */
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header= &cdf->header;
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/* strcpy(, "BCDF"); // terminator out of range */
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header->ID[0]= 'B'; header->ID[1]= 'C'; header->ID[2]= 'D'; header->ID[3]= 'F';
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header->endian= cdf_endian();
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header->version= CDF_VERSION;
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header->subversion= CDF_SUBVERSION;
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header->structbytes= sizeof(CDataFileHeader);
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header->type= cdf->type;
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header->totlayer= cdf->totlayer;
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if(cdf->type == CDF_TYPE_IMAGE) {
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/* fill image header */
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image= &cdf->btype.image;
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image->structbytes= sizeof(CDataFileImageHeader);
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image->tile_size= CDF_TILE_SIZE;
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}
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else if(cdf->type == CDF_TYPE_MESH) {
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/* fill mesh header */
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mesh= &cdf->btype.mesh;
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mesh->structbytes= sizeof(CDataFileMeshHeader);
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}
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cdf_write_header(cdf);
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return 1;
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}
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int cdf_write_layer(CDataFile *cdf, CDataFileLayer *blay)
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{
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return 1;
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}
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int cdf_write_data(CDataFile *cdf, int size, void *data)
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{
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/* write data */
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if(!fwrite(data, size, 1, cdf->writef))
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return 0;
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return 1;
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}
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void cdf_write_close(CDataFile *cdf)
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{
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if(cdf->writef) {
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fclose(cdf->writef);
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cdf->writef= NULL;
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}
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}
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void cdf_remove(char *filename)
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{
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BLI_delete(filename, 0, 0);
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}
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/********************************** Layers ***********************************/
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CDataFileLayer *cdf_layer_find(CDataFile *cdf, int type, char *name)
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{
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CDataFileLayer *layer;
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int a;
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for(a=0; a<cdf->totlayer; a++) {
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layer= &cdf->layer[a];
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if(layer->type == type && strcmp(layer->name, name) == 0)
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return layer;
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}
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return NULL;
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}
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CDataFileLayer *cdf_layer_add(CDataFile *cdf, int type, char *name, size_t datasize)
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{
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CDataFileLayer *newlayer, *layer;
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/* expand array */
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newlayer= MEM_callocN(sizeof(CDataFileLayer)*(cdf->totlayer+1), "CDataFileLayer");
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memcpy(newlayer, cdf->layer, sizeof(CDataFileLayer)*cdf->totlayer);
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cdf->layer= newlayer;
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cdf->totlayer++;
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/* fill in new layer */
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layer= &cdf->layer[cdf->totlayer-1];
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layer->structbytes= sizeof(CDataFileLayer);
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layer->datatype= CDF_DATA_FLOAT;
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layer->datasize= datasize;
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layer->type= type;
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BLI_strncpy(layer->name, name, CDF_LAYER_NAME_MAX);
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return layer;
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}
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