455 lines
9.6 KiB
C++
455 lines
9.6 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup bke
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*/
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include "MEM_guardedalloc.h"
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#include "BLI_endian_defines.h"
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#include "BLI_endian_switch.h"
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#include "BLI_fileops.h"
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#include "BLI_string.h"
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#include "BLI_utildefines.h"
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#include "BKE_customdata_file.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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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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};
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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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};
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struct CDataFileMeshHeader {
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int structbytes; /* size of this struct in bytes */
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};
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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()
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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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}
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return CDF_ENDIAN_BIG;
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}
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CDataFile *cdf_create(int type)
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{
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CDataFile *cdf = static_cast<CDataFile *>(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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}
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MEM_freeN(cdf);
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}
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/********************************* Read/Write ********************************/
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static bool 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 false;
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}
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if (memcmp(header->ID, "BCDF", sizeof(header->ID)) != 0) {
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return false;
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}
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if (header->version > CDF_VERSION) {
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return false;
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}
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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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BLI_endian_switch_int32(&header->type);
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BLI_endian_switch_int32(&header->totlayer);
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BLI_endian_switch_int32(&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 false;
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}
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offset += header->structbytes;
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header->structbytes = sizeof(CDataFileHeader);
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if (BLI_fseek(f, offset, SEEK_SET) != 0) {
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return false;
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}
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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 false;
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}
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if (cdf->switchendian) {
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BLI_endian_switch_int32(&image->width);
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BLI_endian_switch_int32(&image->height);
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BLI_endian_switch_int32(&image->tile_size);
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BLI_endian_switch_int32(&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 false;
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}
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if (cdf->switchendian) {
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BLI_endian_switch_int32(&mesh->structbytes);
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}
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offset += mesh->structbytes;
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mesh->structbytes = sizeof(CDataFileMeshHeader);
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}
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if (BLI_fseek(f, offset, SEEK_SET) != 0) {
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return false;
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}
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cdf->layer = static_cast<CDataFileLayer *>(
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MEM_calloc_arrayN(header->totlayer, sizeof(CDataFileLayer), "CDataFileLayer"));
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cdf->totlayer = header->totlayer;
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if (!cdf->layer) {
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return false;
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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 (!fread(layer, sizeof(CDataFileLayer), 1, f)) {
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return false;
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}
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if (cdf->switchendian) {
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BLI_endian_switch_int32(&layer->type);
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BLI_endian_switch_int32(&layer->datatype);
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BLI_endian_switch_uint64(&layer->datasize);
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BLI_endian_switch_int32(&layer->structbytes);
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}
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if (layer->datatype != CDF_DATA_FLOAT) {
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return false;
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}
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offset += layer->structbytes;
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layer->structbytes = sizeof(CDataFileLayer);
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if (BLI_fseek(f, offset, SEEK_SET) != 0) {
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return false;
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}
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}
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cdf->dataoffset = offset;
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return true;
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}
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static bool 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 false;
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}
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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 false;
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}
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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 false;
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}
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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 false;
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}
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}
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return true;
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}
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bool cdf_read_open(CDataFile *cdf, const char *filepath)
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{
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FILE *f;
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f = BLI_fopen(filepath, "rb");
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if (!f) {
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return false;
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}
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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 false;
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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 false;
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}
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return true;
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}
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bool 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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}
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offset += cdf->layer[a].datasize;
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}
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return (BLI_fseek(cdf->readf, offset, SEEK_SET) == 0);
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}
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bool cdf_read_data(CDataFile *cdf, uint size, void *data)
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{
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/* read data */
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if (!fread(data, size, 1, cdf->readf)) {
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return false;
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}
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/* switch endian if necessary */
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if (cdf->switchendian) {
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BLI_endian_switch_float_array(static_cast<float *>(data), size / sizeof(float));
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}
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return true;
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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 = nullptr;
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}
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}
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bool cdf_write_open(CDataFile *cdf, const char *filepath)
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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 = BLI_fopen(filepath, "wb");
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if (!f) {
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return false;
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}
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cdf->writef = f;
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/* Fill header. */
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header = &cdf->header;
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/* Copy "BCDF" (string terminator out of range). */
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header->ID[0] = 'B';
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header->ID[1] = 'C';
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header->ID[2] = 'D';
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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 true;
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}
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bool cdf_write_layer(CDataFile * /*cdf*/, CDataFileLayer * /*blay*/)
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{
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return true;
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}
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bool cdf_write_data(CDataFile *cdf, uint 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 false;
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}
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return true;
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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 = nullptr;
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}
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}
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void cdf_remove(const char *filepath)
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{
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BLI_delete(filepath, false, false);
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}
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/********************************** Layers ***********************************/
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CDataFileLayer *cdf_layer_find(CDataFile *cdf, int type, const 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 && STREQ(layer->name, name)) {
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return layer;
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}
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}
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return nullptr;
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}
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CDataFileLayer *cdf_layer_add(CDataFile *cdf, int type, const 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 = static_cast<CDataFileLayer *>(
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MEM_calloc_arrayN((cdf->totlayer + 1), sizeof(CDataFileLayer), "CDataFileLayer"));
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if (cdf->totlayer > 0) {
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memcpy(newlayer, cdf->layer, sizeof(CDataFileLayer) * cdf->totlayer);
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}
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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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STRNCPY(layer->name, name);
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return layer;
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}
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