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snapshot.c
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snapshot.c
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/*
* Copyright (c) 2017 Jose M. Dana
*
* This file is part of gadget_snapshots.
* http://github.com/jmdana/gadget_snapshots
*
* gadget_snapshots 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 (version 3 of the License only).
*
* gadget_snapshots 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 gadget_snapshots. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <float.h>
#include <math.h>
#include <byteswap.h>
#include "snapshot.h"
inline long swap64(long x) {
if(!SWAP)
return x;
return bswap_64(x);
}
inline int swap32(int x) {
if(!SWAP)
return x;
return bswap_32(x);
}
inline short swap16(short x) {
if(!SWAP)
return x;
return bswap_16(x);
}
inline float swapf(float x) {
if(!SWAP)
return x;
float outf;
char *in = (char *) &x;
char *out = (char*) &outf;
out[0] = in[3];
out[1] = in[2];
out[2] = in[1];
out[3] = in[0];
return outf;
}
inline double swapd(double x) {
if(!SWAP)
return x;
double outd;
char *in = (char *) &x;
char *out = (char*) &outd;
out[0] = in[7];
out[1] = in[6];
out[2] = in[5];
out[3] = in[4];
out[4] = in[3];
out[5] = in[2];
out[6] = in[1];
out[7] = in[0];
return outd;
}
int read_size(FILE *f) {
int size;
fread(&size, sizeof(int), 1, f);
if(feof(f))
return 0;
return swap32(size);
}
header construct_header(datablock *db) {
int i;
header h = *(header *)db->data->data;
if(SWAP) {
for(i=0; i<6; i++) {
h.npart[i] = swap32(h.npart[i]);
h.mass[i] = swapd(h.mass[i]);
h.npartTotal[i] = swap32(h.npartTotal[i]);
}
h.time = swapd(h.time);
h.redshift = swapd(h.redshift);
h.flag_sfr = swap32(h.flag_sfr);
h.flag_feedback = swap32(h.flag_feedback);
h.flag_cooling = swap32(h.flag_cooling);
h.num_files = swap32(h.num_files);
h.BoxSize = swapd(h.BoxSize);
h.Omega0 = swapd(h.Omega0);
h.OmegaLambda = swapd(h.OmegaLambda);
h.HubbleParam = swapd(h.HubbleParam);
}
return h;
}
int snapformat(FILE *f) {
long pos;
int size;
pos = ftell(f);
rewind(f);
size = read_size(f);
fseek(f, pos, SEEK_SET);
if(size == TAG_SIZE || swap32(size) == TAG_SIZE)
return 2;
else if(size == HEADER_SIZE || swap32(size) == HEADER_SIZE)
return 1;
return 0;
}
int endianness(FILE *f) {
long pos;
int size;
pos = ftell(f);
rewind(f);
size = read_size(f);
fseek(f, pos, SEEK_SET);
if(size == TAG_SIZE || size == HEADER_SIZE)
return BYTE_ORDER;
else
return BYTE_ORDER == LITTLE_ENDIAN ? BIG_ENDIAN : LITTLE_ENDIAN;
}
int print_header(header h) {
printf("********************************************\n");
printf("Gas | #: %10d\t| Mass: %f\n", h.npart[0], h.mass[0]);
printf("Halo | #: %10d\t| Mass: %f\n", h.npart[1], h.mass[1]);
printf("Disk | #: %10d\t| Mass: %f\n", h.npart[2], h.mass[2]);
printf("Bulge | #: %10d\t| Mass: %f\n", h.npart[3], h.mass[3]);
printf("Stars | #: %10d\t| Mass: %f\n", h.npart[4], h.mass[4]);
printf("Bndry | #: %10d\t| Mass: %f\n", h.npart[5], h.mass[5]);
printf("Time: %f\n", h.time);
printf("Redshift: %f\n", h.redshift);
printf("FlagSfr: %d\n", h.flag_sfr);
printf("FlagFeedback: %d\n", h.flag_feedback);
printf("FlagCooling: %d\n", h.flag_cooling);
printf("NumFiles: %d\n", h.num_files);
printf("BoxSize: %f\n", h.BoxSize);
printf("Omega0: %f\n", h.Omega0);
printf("OmegaLambda: %f\n", h.OmegaLambda);
printf("HubbleParam: %f\n", h.HubbleParam);
printf("********************************************\n");
return 0;
}
int free_block(block *b) {
free(b->data);
free(b);
return 0;
}
int free_datablock(datablock *db) {
if(SNAP_FORMAT == 2)
free_block(db->tag);
free_block(db->data);
free(db);
return 0;
}
int write_block(FILE *dst, block *b) {
int s1;
int s2;
printf("Writing %d + %ld * 2 bytes\n", b->size1, sizeof(int));
s1 = swap32(b->size1);
s2 = swap32(b->size2);
fwrite(&s1, sizeof(int), 1, dst);
fwrite(b->data, sizeof(char), b->size1, dst);
fwrite(&s2, sizeof(int), 1, dst);
return 0;
}
int write_datablock(FILE *dst, datablock *db) {
write_block(dst, db->tag);
write_block(dst, db->data);
return 0;
}
block *read_block(FILE *src) {
block *b = NULL;
int size = read_size(src);
if(!size)
return b;
b = (block *) malloc(sizeof(block));
b->data = (char *) malloc(sizeof(char) * size);
b->size1 = size;
fread(b->data, sizeof(char), size, src);
size = read_size(src);
b->size2 = size;
if(b->size1 != b->size2) {
printf("The delimiters don't agree on the size of the block!\n");
printf("%d != %d\n", b->size1, b->size2);
printf("Exiting...\n");
exit(EXIT_FAILURE);
}
return b;
}
int init_snapshot(FILE *src) {
int endian;
endian = endianness(src);
printf("Your machine is %s\n", BYTE_ORDER == LITTLE_ENDIAN ? "Little-Endian" : "Big-Endian");
printf("The file is %s\n", endian == LITTLE_ENDIAN ? "Little-Endian" : "Big-Endian");
SWAP = (endian != BYTE_ORDER);
if(SWAP)
printf("Byte swapping required \n");
SNAP_FORMAT = snapformat(src);
return 0;
}
datablock *read_datablock(FILE *src) {
datablock *db;
db = (datablock *) malloc(sizeof(*db));
if(SNAP_FORMAT == 1) {
db->tag = NULL;
}
else if(SNAP_FORMAT == 2) {
db->tag = read_block(src);
if(!db->tag) {
free(db);
return NULL;
}
}
db->data = read_block(src);
if(!db->data) {
free(db->tag);
free(db);
return NULL;
}
return db;
}
int mass_handler(header h, datablock *db) {
int i;
int m;
float *masses;
float min;
float max;
int total_size = 0;
masses = (float *) db->data->data;
for(i=0; i<6; i++)
if(h.npart[i] != 0 && h.mass[i] == 0) {
total_size += h.npart[i] * sizeof(float);
min = FLT_MAX;
max = FLT_MIN;
for(m=0; m < h.npart[i]; m++) {
min = fmin(min, swapf(masses[m]));
max = fmax(max, swapf(masses[m]));
}
if(min == max)
printf("Type %d: [%f]\n", i, min);
else
printf("Type %d: [%f - %f]\n", i, min, max);
masses += h.npart[i];
}
if(total_size != db->data->size1)
printf("The measured size is different from the reported by the block delimiter!\n");
return 0;
}
int onlygas_handler(header h, datablock *db) {
int i;
float *values;
float min;
float max;
int total_size = 0;
values = (float *) db->data->data;
if(h.npart[0] != 0) {
min = FLT_MAX;
max = FLT_MIN;
total_size += h.npart[0] * sizeof(float);
for(i=0; i < h.npart[0]; i++) {
min = fmin(min, swapf(values[i]));
max = fmax(max, swapf(values[i]));
}
if(min == max)
printf("Type 0: [%f]\n", min);
else
printf("Type 0: [%f - %f]\n", min, max);
}
if(total_size != db->data->size1)
printf("The measured size is different from the reported by the block delimiter!\n");
return 0;
}