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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h> // for intptr_t
#include <string.h>
#include <gmp.h>
#include "pbc_utils.h"
#include "pbc_memory.h"
#include "pbc_param.h"
#include "pbc_a_param.h"
#include "pbc_mnt.h"
#include "pbc_d_param.h"
#include "pbc_e_param.h"
#include "pbc_f_param.h"
#include "pbc_a1_param.h"
#include "pbc_g_param.h"
#include "pbc_i_param.h"
#include "misc/symtab.h"
#include "ecc/param.h"
// Parser that reads a bunch of strings and places them in a symbol table.
// TODO: Replace with Flex/Bison?
enum {
token_none = 0,
token_langle,
token_langleslash,
token_rangle,
token_word,
token_eof,
};
struct token_s {
int type;
char *s;
};
typedef struct token_s token_t[1];
typedef struct token_s *token_ptr;
// Reads next token from `input`.
// Returns 1 on reaching `end` (if not NULL) or '\0' is read, 0 otherwise.
static const char *token_get(token_t tok, const char *input, const char *end) {
char *buf;
int n = 32;
int i;
char c;
#define get() (((!end || input < end) && *input) ? (c = *input++, 0) : 1)
// Skip whitespace and comments.
for(;;) {
do {
if (get()) {
tok->type = token_eof;
return input;
}
} while (strchr(" \t\r\n", c));
if (c == '#') {
do {
if (get()) {
tok->type = token_eof;
return input;
}
} while (c != '\n');
} else break;
}
tok->type = token_word;
pbc_free(tok->s);
buf = (char *) pbc_malloc(n);
i = 0;
for (;;) {
buf[i] = c;
i++;
if (i == n) {
n += 32;
buf = (char *) pbc_realloc(buf, n);
}
if (get() || strchr(" \t\r\n</>", c)) break;
}
buf[i] = 0;
tok->s = buf;
return input;
#undef get
}
static void token_init(token_t tok) {
tok->type = token_none;
tok->s = NULL;
}
static void token_clear(token_t tok) {
pbc_free(tok->s);
}
static void read_symtab(symtab_t tab, const char *input, size_t limit) {
token_t tok;
const char *inputend = limit ? input + limit : NULL;
token_init(tok);
for (;;) {
input = token_get(tok, input, inputend);
if (tok->type != token_word) break;
char *key = pbc_strdup(tok->s);
input = token_get(tok, input, inputend);
if (tok->type != token_word) {
pbc_free(key);
break;
}
symtab_put(tab, pbc_strdup(tok->s), key);
pbc_free(key);
}
token_clear(tok);
}
// These functions have hidden visibility (see header).
void param_out_type(FILE *stream, char *s) {
fprintf(stream, "type %s\n", s);
}
void param_out_mpz(FILE *stream, char *s, mpz_t z) {
fprintf(stream, "%s ", s);
mpz_out_str(stream, 0, z);
fprintf(stream, "\n");
}
void param_out_int(FILE *stream, char *s, int i) {
mpz_t z;
mpz_init(z);
mpz_set_si(z, i);
param_out_mpz(stream, s, z);
mpz_clear(z);
}
static const char *lookup(symtab_t tab, const char *key) {
if (!symtab_has(tab, key)) {
pbc_error("missing param: `%s'", key);
return NULL;
}
return symtab_at(tab, key);
}
int lookup_mpz(mpz_t z, symtab_t tab, const char *key) {
const char *data = lookup(tab, key);
if (!data) {
pbc_error("missing param: `%s'", key);
return 1;
}
mpz_set_str(z, data, 0);
return 0;
}
int lookup_int(int *n, symtab_t tab, const char *key) {
mpz_t z;
const char *data = lookup(tab, key);
if (!data) {
pbc_error("missing param: `%s'", key);
return 1;
}
mpz_init(z);
mpz_set_str(z, data, 0);
*n = mpz_get_si(z);
mpz_clear(z);
return 0;
}
static int param_set_tab(pbc_param_t par, symtab_t tab) {
const char *s = lookup(tab, "type");
static struct {
char *s;
int (*fun)(pbc_param_ptr, symtab_t tab);
} funtab[] = {
{ "a", pbc_param_init_a },
{ "d", pbc_param_init_d },
{ "e", pbc_param_init_e },
{ "f", pbc_param_init_f },
{ "g", pbc_param_init_g },
{ "a1", pbc_param_init_a1 },
{ "i", pbc_param_init_i },
};
int res = 1;
if (s) {
unsigned int i;
for(i = 0; i < sizeof(funtab)/sizeof(*funtab); i++) {
if (!strcmp(s, funtab[i].s)) {
res = funtab[i].fun(par, tab);
if (res) pbc_error("bad pairing parameters");
return res;
}
}
}
pbc_error("unknown pairing type");
return res;
}
// Public functions:
int pbc_param_init_set_str(pbc_param_t par, const char *input) {
symtab_t tab;
symtab_init(tab);
read_symtab(tab, input, 0);
int res = param_set_tab(par, tab);
symtab_forall_data(tab, pbc_free);
symtab_clear(tab);
return res;
}
int pbc_param_init_set_buf(pbc_param_t par, const char *input, size_t len) {
symtab_t tab;
symtab_init(tab);
read_symtab(tab, input, len);
int res = param_set_tab(par, tab);
symtab_forall_data(tab, pbc_free);
symtab_clear(tab);
return res;
}
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