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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include "raster3d_intern.h"
/*---------------------------------------------------------------------------*/
static int cacheRead_readFun(int tileIndex, void *tileBuf, void *closure)
{
RASTER3D_Map *map = closure;
if (!Rast3d_read_tile(map, tileIndex, tileBuf, map->typeIntern)) {
Rast3d_error("cacheRead_readFun: error in Rast3d_read_tile");
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
static int initCacheRead(RASTER3D_Map *map, int nCached)
{
map->cache =
Rast3d_cache_new_read(nCached, map->tileSize * map->numLengthIntern,
map->nTiles, cacheRead_readFun, map);
if (map->cache == NULL) {
Rast3d_error("initCacheRead: error in Rast3d_cache_new_read");
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
/*
the map->index array is (ab)used to store the positions of the tiles in the
file-cash. we can do this since we maintain the invariant for every tile
that it is either in no file (index == -1) or in either the output-file
(index >= 0) or the cash-file (index <= -2). to convert the file-position in
the cash-file into an index we use the following function:
index = - (fileposition + 2)
symmetrically, we use
fileposition = - (index + 2)
to convert from index to the fileposition.
*/
/*---------------------------------------------------------------------------*/
static int cacheWrite_readFun(int tileIndex, void *tileBuf, void *closure)
{
RASTER3D_Map *map = closure;
int index;
size_t nBytes;
size_t offs, offsLast;
ssize_t res;
long int pos;
pos = map->index[tileIndex];
/* tile has already been flushed onto output file or does not exist yet */
if (pos >=
-1) { /* note, Rast3d_read_tile takes care of the case pos == -1 */
Rast3d_read_tile(map, tileIndex, tileBuf, map->typeIntern);
return 1;
}
/* tile is in cache file */
pos = -pos - 2; /* pos is shifted by 2 to avoid 0 and -1 */
nBytes = map->tileSize * map->numLengthIntern;
offs = pos * (nBytes + sizeof(int));
/* seek tile and read it into buffer */
if (lseek(map->cacheFD, offs, SEEK_SET) == -1) {
Rast3d_error("cacheWrite_readFun: can't position file");
return 0;
}
if ((res = read(map->cacheFD, tileBuf, nBytes)) < 0 ||
(size_t)res != nBytes) {
Rast3d_error("cacheWrite_readFun: can't read file");
return 0;
}
/* remove it from index */
map->index[tileIndex] = -1;
/* if it is the last tile in the file we are done */
/* map->cachePosLast tells us the position of the last tile in the file */
if (map->cachePosLast == pos) {
map->cachePosLast--;
return 1;
}
/* otherwise we move the last tile in the file into the position of */
/* the tile we just read and update the hash information */
offsLast = map->cachePosLast * (nBytes + sizeof(int));
if (lseek(map->cacheFD, offsLast, SEEK_SET) == -1) {
Rast3d_error("cacheWrite_readFun: can't position file");
return 0;
}
if ((res = read(map->cacheFD, xdr, nBytes + sizeof(int))) < 0 ||
(size_t)res != nBytes + sizeof(int)) {
Rast3d_error("cacheWrite_readFun: can't read file");
return 0;
}
if (lseek(map->cacheFD, offs, SEEK_SET) == -1) {
Rast3d_error("cacheWrite_readFun: can't position file");
return 0;
}
if ((res = write(map->cacheFD, xdr, nBytes + sizeof(int))) < 0 ||
(size_t)res != nBytes + sizeof(int)) {
Rast3d_error("cacheWrite_readFun: can't write file");
return 0;
}
index = *((int *)((unsigned char *)xdr + nBytes));
map->index[index] = -pos - 2;
map->cachePosLast--;
return 1;
}
/*---------------------------------------------------------------------------*/
static int cacheWrite_writeFun(int tileIndex, const void *tileBuf,
void *closure)
{
RASTER3D_Map *map = closure;
size_t nBytes;
size_t offs;
ssize_t res;
if (map->index[tileIndex] != -1)
return 1;
map->cachePosLast++;
nBytes = map->tileSize * map->numLengthIntern;
offs = map->cachePosLast * (nBytes + sizeof(int));
if (lseek(map->cacheFD, offs, SEEK_SET) == -1) {
Rast3d_error("cacheWrite_writeFun: can't position file");
return 0;
}
if ((res = write(map->cacheFD, tileBuf, nBytes)) < 0 ||
(size_t)res != nBytes) {
Rast3d_error("cacheWrite_writeFun: can't write file");
return 0;
}
if (write(map->cacheFD, &tileIndex, sizeof(int)) != sizeof(int)) {
Rast3d_error("cacheWrite_writeFun: can't write file");
return 0;
}
map->index[tileIndex] = -map->cachePosLast - 2;
return 1;
}
/*---------------------------------------------------------------------------*/
static int disposeCacheWrite(RASTER3D_Map *map)
{
if (map->cacheFD >= 0) {
if (close(map->cacheFD) != 0) {
Rast3d_error("disposeCacheWrite: could not close file");
return 0;
}
remove(map->cacheFileName);
Rast3d_free(map->cacheFileName);
}
Rast3d_cache_dispose(map->cache);
return 1;
}
/*---------------------------------------------------------------------------*/
static int initCacheWrite(RASTER3D_Map *map, int nCached)
{
map->cacheFileName = G_tempfile();
map->cacheFD = open(map->cacheFileName, O_RDWR | O_CREAT | O_TRUNC, 0666);
if (map->cacheFD < 0) {
Rast3d_error("initCacheWrite: could not open file");
return 0;
}
map->cachePosLast = -1;
map->cache = Rast3d_cache_new(nCached, map->tileSize * map->numLengthIntern,
map->nTiles, cacheWrite_writeFun, map,
cacheWrite_readFun, map);
if (map->cache == NULL) {
disposeCacheWrite(map);
Rast3d_error("initCacheWrite: error in Rast3d_cache_new");
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
int Rast3d_init_cache(RASTER3D_Map *map, int nCached)
{
if (map->operation == RASTER3D_READ_DATA) {
if (!initCacheRead(map, nCached)) {
Rast3d_error("Rast3d_init_cache: error in initCacheRead");
return 0;
}
return 1;
}
if (!initCacheWrite(map, nCached)) {
Rast3d_error("Rast3d_init_cache: error in initCacheWrite");
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
static int disposeCacheRead(RASTER3D_Map *map)
{
Rast3d_cache_dispose(map->cache);
return 1;
}
/*---------------------------------------------------------------------------*/
int Rast3d_dispose_cache(RASTER3D_Map *map)
{
if (map->operation == RASTER3D_READ_DATA) {
if (!disposeCacheRead(map)) {
Rast3d_error("Rast3d_dispose_cache: error in disposeCacheRead");
return 0;
}
return 1;
}
if (!disposeCacheWrite(map)) {
Rast3d_error("Rast3d_dispose_cache: error in disposeCacheWrite");
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
static int cacheFlushFun(int tileIndex, const void *tileBuf, void *closure)
{
RASTER3D_Map *map = closure;
if (!Rast3d_write_tile(map, tileIndex, tileBuf, map->typeIntern)) {
Rast3d_error("cacheFlushFun: error in Rast3d_write_tile");
return 0;
}
return 1;
}
/*---------------------------------------------------------------------------*/
int Rast3d_flush_all_tiles(RASTER3D_Map *map)
{
size_t tileIndex, nBytes;
size_t offs;
if (map->operation == RASTER3D_READ_DATA) {
if (!Rast3d_cache_remove_all(map->cache)) {
Rast3d_error(
"Rast3d_flush_all_tiles: error in Rast3d_cache_remove_all");
return 0;
}
return 1;
}
/* make cache write into output file instead of cache file */
Rast3d_cache_set_remove_fun(map->cache, cacheFlushFun, map);
/* first flush all the tiles which are in the file cache */
nBytes = map->tileSize * map->numLengthIntern;
while (map->cachePosLast >= 0) {
offs = map->cachePosLast * (nBytes + sizeof(int)) + nBytes;
if (lseek(map->cacheFD, offs, SEEK_SET) == -1) {
Rast3d_error("Rast3d_flush_all_tiles: can't position file");
return 0;
}
if (read(map->cacheFD, &tileIndex, sizeof(int)) != sizeof(int)) {
Rast3d_error("Rast3d_flush_all_tiles: can't read file");
return 0;
}
if (!Rast3d_cache_load(map->cache, tileIndex)) {
Rast3d_error("Rast3d_flush_all_tiles: error in Rast3d_cache_load");
return 0;
}
if (!Rast3d_cache_flush(map->cache, tileIndex)) {
Rast3d_error("Rast3d_flush_all_tiles: error in Rast3d_cache_flush");
return 0;
}
}
/* then flush all the tiles which remain in the non-file cache */
if (!Rast3d_cache_flush_all(map->cache)) {
Rast3d_error("Rast3d_flush_all_tiles: error in Rast3d_cache_flush_all");
return 0;
}
/* now the cache should write into the cache file again */
Rast3d_cache_set_remove_fun(map->cache, cacheWrite_writeFun, map);
return 1;
}
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