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/*
* This file is part of John the Ripper password cracker,
* Copyright (c) 1996-98 by Solar Designer
*/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "cfg.h"
#include "rpp.h"
int
rpp_init(struct rpp_context *ctx, char *subsection)
{
struct cfg_list *list;
if ((list = cfg_get_list(SECTION_RULES, subsection)))
if ((ctx->input = list->head)) {
ctx->count = -1;
return 0;
}
return 1;
}
void
rpp_add_char(struct rpp_range *range, unsigned char c)
{
int index = c / ARCH_BITS;
ARCH_WORD mask = 1 << (c % ARCH_BITS);
if (range->mask[index] & mask) return;
range->mask[index] |= mask;
range->chars[range->count++] = (char)c;
}
void
rpp_process_rule(struct rpp_context *ctx)
{
struct rpp_range *range;
unsigned char *input, *output, *end;
unsigned char c1, c2, c;
input = (unsigned char *)ctx->input->data;
output = (unsigned char *)ctx->output;
end = output + RULE_BUFFER_SIZE - 1;
c1 = 0;
ctx->count = 0;
while (*input && output < end)
switch (*input) {
case '\\':
if (*++input) *output++ = *input++;
break;
case '[':
if (ctx->count >= RULE_RANGES_MAX) {
*output++ = *input++;
break;
}
input++;
range = &ctx->ranges[ctx->count++];
range->pos = (char *)output++;
range->index = range->count = 0;
memset(range->mask, 0, sizeof(range->mask));
while (*input && *input != ']')
switch (*input) {
case '\\':
if (*++input) rpp_add_char(range, c1 = *input++);
break;
case '-':
if ((c2 = *++input))
if (c1 && range->count) {
if (c1 > c2)
for (c = c1 - 1; c >= c2; c--)
rpp_add_char(range, c);
else
for (c = c1 + 1; c <= c2; c++)
rpp_add_char(range, c);
}
c1 = c2;
break;
default:
rpp_add_char(range, c1 = *input++);
}
if (*input) input++;
break;
default:
*output++ = *input++;
}
*output = 0;
}
char *
rpp_next(struct rpp_context *ctx)
{
struct rpp_range *range;
int index;
if (ctx->count < 0) {
if (!ctx->input) return NULL;
rpp_process_rule(ctx);
}
if ((index = ctx->count - 1) >= 0) {
do {
range = &ctx->ranges[index];
*range->pos = range->chars[range->index];
} while (index--);
index = ctx->count - 1;
do {
range = &ctx->ranges[index];
if (++range->index < range->count) break;
range->index = 0;
} while (index--);
}
if (index < 0) {
ctx->input = ctx->input->next;
ctx->count = -1;
}
return ctx->output;
}
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