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#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include "cwalk.h"
#include "toml.h"
#include "unit.h"
#include "compressor.h"
#include "eprintf.h"
#include "util.h"
static const char ROOT[NAME_MAX+1] = "compressor_maps";
static int load_compressor(const char *path, Compressor *comp);
static int load_point(const toml_table_t *tbl, const char *key, const char *flowunit, Point *pt);
static int toml_filter(const struct dirent *de);
static void free_arr(void **arr, int n);
/* Load descriptions of all of the compressor maps.
* Places a malloc-allocated array of compressors at *comps,
* and the number of compressors at *n.
* Returns 0 on success. */
int
load_compressors(Compressor **comps, int *n) {
struct dirent **files;
int nfiles;
char path[3 * NAME_MAX];
Compressor comp;
*comps = NULL;
*n = 0;
nfiles = scandir(ROOT, &files, toml_filter, alphasort);
if (nfiles < 0) {
weprintf("failed to scan %s", ROOT);
return 1;
}
*comps = malloc(nfiles * sizeof(Compressor));
if (*comps == NULL) {
weprintf("malloc failed");
return 1;
}
/* TODO: parallelize. */
while (nfiles > 0) {
(void) cwk_path_join(ROOT, files[nfiles-1]->d_name, path, nelem(path));
if (load_compressor(path, &comp) != 0) {
weprintf("failed to load compressor from %s", path);
free_arr((void **) files, nfiles);
free(*comps);
return 1;
}
(*comps)[(*n)++] = comp;
free(files[--nfiles]);
}
free(files);
return 0;
}
/* Load a compressor toml file into *comp. Returns 0 on success. */
static int
load_compressor(const char *path, Compressor *comp) {
FILE *f;
char errbuf[256];
toml_table_t *tbl;
toml_value_t brand, series, model, flowunit;
int err;
f = fopen(path, "r");
if (f == NULL) {
weprintf("failed to open %s", path);
return 1;
}
tbl = toml_parse_file(f, errbuf, sizeof(errbuf));
if (!tbl) {
weprintf("failed to parse %s: %s", path, errbuf);
return 1;
}
if (fclose(f) != 0) {
weprintf("failed to close %s", path);
toml_free(tbl);
return 1;
}
err = 0;
brand = toml_table_string(tbl, "brand");
if (!brand.ok) {
weprintf("%s: missing 'brand'", path);
err = 1;
}
series = toml_table_string(tbl, "series");
if (!series.ok) {
weprintf("%s: missing 'series'", path);
err = 1;
}
model = toml_table_string(tbl, "model");
if (!model.ok) {
weprintf("%s: missing 'model'", path);
err = 1;
}
flowunit = toml_table_string(tbl, "flowunit");
if (!flowunit.ok) {
weprintf("%s: missing 'flowunit'", path);
err = 1;
}
if (err) {
toml_free(tbl);
return 1;
}
strncpy(comp->brand, brand.u.s, nelem(comp->brand)-1);
strncpy(comp->series, series.u.s, nelem(comp->series)-1);
strncpy(comp->model, model.u.s, nelem(comp->model)-1);
(void) cwk_path_change_extension(path, "jpg", comp->imgfile, sizeof(comp->imgfile));
if (load_point(tbl, "origin", flowunit.u.s, &comp->origin) != 0) {
weprintf("%s: failed to load 'origin'", path);
toml_free(tbl);
return 1;
}
if (load_point(tbl, "ref", flowunit.u.s, &comp->ref) != 0) {
weprintf("%s: failed to load 'ref'", path);
toml_free(tbl);
return 1;
}
toml_free(tbl);
return 0;
}
/* load a Point from a compressor toml file.
* key - the name of the toml subtable containing the point.
* pt - the returned point.
* Returns 0 on success. */
static int
load_point(const toml_table_t *tbl, const char *key, const char *flowunit, Point *pt) {
toml_table_t *subtbl;
int err;
toml_value_t x, y, pr, flowval;
Flow flow;
subtbl = toml_table_table(tbl, key);
if (!subtbl) {
weprintf("missing table '%s'", key);
return 1;
}
err = 0;
x = toml_table_int(subtbl, "x");
if (!x.ok) {
weprintf("%s: missing 'x'", key);
err = 1;
}
y = toml_table_int(subtbl, "y");
if (!y.ok) {
weprintf("%s: missing 'y'", key);
err = 1;
}
pr = toml_table_double(subtbl, "pr");
if (!pr.ok) {
weprintf("%s: missing 'pr'", key);
err = 1;
}
flowval = toml_table_double(subtbl, "flow");
if (!flowval.ok) {
weprintf("%s: missing 'flow'", key);
err = 1;
}
if (err) {
toml_free(subtbl);
return 1;
}
if (parse_flow(flowval.u.d, flowunit, &flow) != 0) {
weprintf("invalid flow: %d %s", flowval.u.d, flowunit);
toml_free(subtbl);
return 1;
}
pt->x = x.u.i;
pt->y = y.u.i;
pt->pr = pr.u.d;
pt->flow = flow;
toml_free(subtbl);
return 0;
}
static int
toml_filter(const struct dirent *de) {
const char *extension;
size_t length, n;
char toml[] = ".toml";
if (!cwk_path_get_extension(de->d_name, &extension, &length)) {
return 0; /* no extension. */
}
n = min(nelem(toml)-1, length);
return strncmp(".toml", extension, n) == 0; /* extension is ".toml". */
}
static void
free_arr(void **arr, int n) {
while (n-- > 0) {
free(arr[n]);
}
free(arr);
}
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