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#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <grass/raster3d.h>
#include "raster3d_intern.h"
/*---------------------------------------------------------------------------*/
static int Rast3d_readIndex(RASTER3D_Map *map)
{
unsigned char *tmp, *tmp2;
int dummy1, dummy2, indexLength, tileIndex;
long indexLast;
indexLast = lseek(map->data_fd, (long)0, SEEK_END);
if (indexLast == -1) {
Rast3d_error("Rast3d_readIndex: can't position file");
return 0;
}
indexLength = indexLast - map->indexOffset;
if (lseek(map->data_fd, map->indexOffset, SEEK_SET) == -1) {
Rast3d_error("Rast3d_readIndex: can't position file");
return 0;
}
tmp = Rast3d_malloc(map->indexLongNbytes * map->nTiles);
if (tmp == NULL) {
Rast3d_error("Rast3d_readIndex: error in Rast3d_malloc");
return 0;
}
/* The size of the tile index array in the map file */
if (indexLength == map->indexLongNbytes * map->nTiles) {
if (read(map->data_fd, tmp, indexLength) != indexLength) {
Rast3d_error("Rast3d_readIndex: can't read file");
return 0;
}
}
else
/* ATTENTION: RLE encoded reading is only supported for backward
* compatibility */
if (indexLength <
map->indexLongNbytes * map->nTiles) { /* RLE encoded? */
if (indexLength > (int)sizeof(long) * map->nTiles) {
/*->index large enough? */
tmp2 = Rast3d_malloc(indexLength);
if (tmp2 == NULL) {
Rast3d_error("Rast3d_readIndex: error in Rast3d_malloc");
return 0;
}
}
else /* YES */
tmp2 = (unsigned char *)map->index;
if (read(map->data_fd, tmp2, indexLength) != indexLength) {
Rast3d_error("Rast3d_readIndex: can't read file");
return 0;
}
Rast3d_rle_decode((char *)tmp2, (char *)tmp,
map->indexLongNbytes * map->nTiles, 1, &dummy1,
&dummy2);
if (indexLength > (int)sizeof(long) * map->nTiles)
Rast3d_free(tmp2);
} /* END RLE */
Rast3d_long_decode(tmp, map->index, map->nTiles, map->indexLongNbytes);
for (tileIndex = 0; tileIndex < map->nTiles; tileIndex++)
if (map->index[tileIndex] == 0)
map->index[tileIndex] = -1;
Rast3d_free(tmp);
return 1;
}
/*---------------------------------------------------------------------------*/
int Rast3d_flush_index(RASTER3D_Map *map)
{
int indexLength, tileIndex;
unsigned char *tmp;
long ldummy;
if (!map->hasIndex)
return 1;
map->indexOffset = lseek(map->data_fd, (long)0, SEEK_END);
if (map->indexOffset == -1) {
Rast3d_error("Rast3d_flush_index: can't rewind file");
return 0;
}
map->indexNbytesUsed =
Rast3d_long_encode(&(map->indexOffset), (unsigned char *)&ldummy, 1);
tmp = Rast3d_malloc(sizeof(long) * map->nTiles);
if (tmp == NULL) {
Rast3d_error("Rast3d_flush_index: error in Rast3d_malloc");
return 0;
}
for (tileIndex = 0; tileIndex < map->nTiles; tileIndex++)
if (map->index[tileIndex] == -1)
map->index[tileIndex] = 0;
(void)Rast3d_long_encode(map->index, tmp, map->nTiles);
indexLength = map->nTiles * sizeof(long);
if (write(map->data_fd, tmp, indexLength) != indexLength) {
Rast3d_error("Rast3d_flush_index: can't write file");
return 0;
}
Rast3d_free(tmp);
if (!Rast3d_readIndex(map)) {
Rast3d_error("Rast3d_flush_index: error in Rast3d_readIndex");
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
static long *cmpIndex;
static int indexSortCompare(const void *a, const void *b)
{
long offset1, offset2;
offset1 = cmpIndex[*((const long *)a)];
offset2 = cmpIndex[*((const long *)b)];
if (offset1 > offset2)
return 1;
if (offset1 < offset2)
return -1;
return 0;
}
/*---------------------------------------------------------------------------*/
int Rast3d_init_index(RASTER3D_Map *map, int hasIndex)
{
int tile;
int i0, i1, i2, i3, i4, i5, nofElts;
long offset;
long *offsetP;
map->hasIndex = hasIndex;
map->index = Rast3d_malloc(sizeof(long) * map->nTiles);
map->tileLength = Rast3d_malloc(sizeof(int) * map->nTiles);
if ((map->index == NULL) || (map->tileLength == NULL)) {
Rast3d_error("Rast3d_init_index: error in Rast3d_malloc");
return 0;
}
if (map->operation == RASTER3D_WRITE_DATA) {
for (tile = 0; tile < map->nTiles; tile++)
map->index[tile] = -1;
return 1;
}
if (!map->hasIndex) {
offset = 0;
for (tile = 0; tile < map->nTiles; tile++) {
map->index[tile] = offset * map->numLengthExtern + map->offset;
nofElts = Rast3d_compute_clipped_tile_dimensions(
map, tile, &i0, &i1, &i2, &i3, &i4, &i5);
map->tileLength[tile] = nofElts * map->numLengthExtern;
offset += nofElts;
}
return 1;
}
if (!Rast3d_readIndex(map)) {
Rast3d_error("Rast3d_init_index: error in Rast3d_readIndex");
return 0;
}
offsetP = Rast3d_malloc(sizeof(long) * map->nTiles);
if (offsetP == NULL) {
Rast3d_error("Rast3d_init_index: error in Rast3d_malloc");
return 0;
}
for (tile = 0; tile < map->nTiles; tile++)
offsetP[tile] = tile;
cmpIndex = map->index;
qsort(offsetP, map->nTiles, sizeof(long), indexSortCompare);
for (tile = 0; tile < map->nTiles - 1; tile++) {
if (map->index[offsetP[tile]] == -1) {
map->tileLength[offsetP[tile]] = 0;
continue;
}
map->tileLength[offsetP[tile]] =
map->index[offsetP[tile + 1]] - map->index[offsetP[tile]];
}
if (map->index[offsetP[map->nTiles - 1]] == -1)
map->tileLength[offsetP[map->nTiles - 1]] = 0;
else
map->tileLength[offsetP[map->nTiles - 1]] =
map->indexOffset - map->index[offsetP[map->nTiles - 1]];
Rast3d_free(offsetP);
return 1;
}
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