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/* This program can extract the raw ASN.1 source from the MS Word for DOS
* file of the MAP ASN.1 spec, such as 380-6.DOC which is part of
* http://ftp.3gpp.org/specs/archive/09_series/09.02/0902-380.zip */
/* (C) 2011 by Harald Welte <laforge@gnumonks.org> */
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include "word_util.h"
enum fmt_block_type {
FMT_CHARACTER,
FMT_PARAGRAPH,
FMT_SECTION,
};
enum extract_mode {
MODE_3, /* 3.8.x / 3.9.x / 3.10.x / 3.11.x */
MODE_4, /* 4.x.y */
};
static enum extract_mode g_mode = MODE_3;
static int g_type4_out_enable = 0;
static FILE *g_outfile;
static int g_debug = 0;
#define DBG(x, args ...) do { \
if (g_debug) fprintf(stderr, x, ## args); } while (0)
static void new_outfile(const char *name)
{
char *tmp = calloc(1, strlen(name) + strlen(".asn1") + 1);
strcpy(tmp, name);
strcat(tmp, ".asn1");
if (g_outfile != stdout)
fclose(g_outfile);
g_outfile = fopen(tmp, "w");
if (!g_outfile) {
perror("opening new outfile");
exit(1);
}
}
static void output_filter_text(struct word_handle *wh, uint32_t start_offs, uint32_t next_offs)
{
uint8_t *cur;
for (cur = wh->base_addr + start_offs; cur < wh->base_addr + next_offs; cur++) {
switch (*cur) {
case 0x01:
case 0x02:
case 0x03:
case 0x04: /* reserved */
case 0x05: /* footnote */
case 0x0c: /* form feed */
case 0x1f: /* hyphenation conditional */
case 0xc4: /* hyphenation protected */
case 0xff: /* sapce protected */
case '\r':
break;
case 0x0b: /* line feed */
fputc('\n', g_outfile);
break;
case 0x09: /* tab */
case '\n':
default:
fputc(*cur, g_outfile);
}
}
}
/* handle paragraph formatting */
static void handle_par_fmt_desc(struct word_handle *wh, struct word_par_fmt *pfmt,
uint32_t start_offs, uint32_t next_offs)
{
DBG("Paragraph format (0x%08x-0x%08x):\n", start_offs, next_offs);
if (!pfmt)
return;
DBG("\tFormat length: %u\n", pfmt->length);
DBG("\tFormat code: 0x%02x\n", pfmt->fmt_code);
DBG("\tAlignment: %d\n", pfmt->par_align);
DBG("\tStd Par Fmt: 0x%02x\n", pfmt->std_par_fmt);
switch (g_mode) {
case MODE_3:
/* Detect ASN.1 code based on the special formatting it uses */
if (pfmt->fmt_code == 0x4c && pfmt->std_par_fmt == 0x26) {
output_filter_text(wh, start_offs, next_offs);
}
break;
}
}
static void handle_hidden_text(struct word_handle *wh, uint32_t start_offs, uint32_t next_offs)
{
char *tmp, *found = NULL;
uint32_t found_delta;
uint32_t dump_start = 0, dump_end = 0;
restart:
tmp = strndup(wh->base_addr + start_offs, next_offs - start_offs);
if (!g_type4_out_enable) {
/* output is not enable, scan for start / continue */
found = strstr(tmp, ".$");
if (found) {
char *mod_name_tok, *mod_name_tmp;
found_delta = found - tmp;
mod_name_tmp = strndup(wh->base_addr + start_offs + found_delta + 2, 80);
mod_name_tok = strtok(mod_name_tmp, " \r\n");
if (mod_name_tok && strlen(mod_name_tok) > 1) {
/* start */
dump_start = start_offs + found_delta + 2;
DBG("Found START (0x%x): '%s'\n", dump_start, found);
new_outfile(mod_name_tok);
fprintf(g_outfile, "\n-- MODULE '%s' START\n", mod_name_tok);
free(mod_name_tmp);
} else {
/* continuation */
dump_start = start_offs + found_delta + 2;
DBG("Found CONT: (0x%x): '%s'\n", dump_start, found);
}
g_type4_out_enable = 1;
}
} else {
/* output already enabled */
dump_start = start_offs;
}
if (dump_start > 0) {
/* scan for interrupt / end */
int found_end = 0;
/* default case: dump until end of format section */
dump_end = next_offs;
found = strstr(tmp, ".#");
if (found) {
found_delta = found - tmp;
if (strlen(found) > 2 && !strncmp(found, ".#END", 5)) {
/* end */
dump_end = start_offs + found_delta;
DBG("Found END (0x%x): '%s'\n", dump_end, found);
found_end = 1;
} else {
/* interrupt */
dump_end = start_offs + found_delta;
DBG("Found INT (0x%x): '%s'\n", dump_end, found);
}
g_type4_out_enable = 0;
}
output_filter_text(wh, dump_start, dump_end);
if (found_end)
fprintf(g_outfile, "\nEND\n-- MODULE END\n");
}
free(tmp);
/* ugly, ugly hack */
if (dump_start && dump_end < next_offs) {
start_offs = dump_end+2;
dump_start = 0; dump_end = 0;
goto restart;
}
}
/* handle character formatting */
static void handle_char_fmt_desc(struct word_handle *wh, struct word_char_fmt *cfmt,
uint32_t start_offs, uint32_t next_offs)
{
switch (g_mode) {
case MODE_4:
/* Detect ASN.1 code based on the hidden text */
if (cfmt && cfmt->char_attr & 0x80)
handle_hidden_text(wh, start_offs, next_offs);
else {
if (g_type4_out_enable)
output_filter_text(wh, start_offs, next_offs);
}
break;
}
}
static void handle_fmt_block(struct word_handle *wh, uint16_t block_nr,
enum fmt_block_type type)
{
uint8_t *block_base = ((uint8_t *)wh->base_addr) + word_bptr2offset(block_nr);
uint32_t offset = *((uint32_t *)block_base);
uint32_t offset_next = *(uint32_t *)(block_base+WORD_BLOCK_SIZE);
uint32_t num_fmts = *(block_base + 0x7f);
struct word_fmt_entry *fmt_tbl = (struct word_fmt_entry *)(block_base + 4);
void *pfmt;
uint32_t last_fmt_start = offset;
int i;
DBG("Format block %u\n", block_nr);
DBG("Offset of first Paragraph: %u (0x%x)\n", offset, offset);
DBG("Number of format table entries: %u\n", num_fmts);
for (i = 0; i < num_fmts; i++) {
DBG("Format tbl entry Text Ptr: %u (0x%x), Fmt: %u\n",
fmt_tbl[i].ptr_text, fmt_tbl[i].ptr_text, fmt_tbl[i].offset_fmt);
if (fmt_tbl[i].offset_fmt != 0xffff)
pfmt = block_base + 4 + fmt_tbl[i].offset_fmt;
else
pfmt = NULL;
switch (type) {
case FMT_PARAGRAPH:
handle_par_fmt_desc(wh, pfmt, last_fmt_start, fmt_tbl[i].ptr_text);
break;
case FMT_CHARACTER:
handle_char_fmt_desc(wh, pfmt, last_fmt_start, fmt_tbl[i].ptr_text);
break;
}
last_fmt_start = fmt_tbl[i].ptr_text;
if (i == num_fmts -1) {
/* in the last entry, check if there is another block */
if (fmt_tbl[i].ptr_text == offset_next) {
handle_fmt_block(wh, block_nr+1, type);
}
}
}
}
static void process(struct word_handle *wh)
{
struct word_file_hdr *wfh = (struct word_file_hdr *) wh->base_addr;
uint32_t char_fmt_ptr;
DBG("Word file size: %u\n", wh->file_size);
DBG("End of text PTR: %u (0x%x)\n", wfh->ptr_end_of_text, wfh->ptr_end_of_text);
DBG("Paragraph fmt Block PTR: %u, offset = %u\n", wfh->bptr_fmt_para,
word_bptr2offset(wfh->bptr_fmt_para));
char_fmt_ptr = wfh->ptr_end_of_text;
if (char_fmt_ptr % WORD_BLOCK_SIZE)
char_fmt_ptr = (char_fmt_ptr - (char_fmt_ptr % WORD_BLOCK_SIZE)) + WORD_BLOCK_SIZE;
handle_fmt_block(wh, wfh->bptr_fmt_para, FMT_PARAGRAPH);
handle_fmt_block(wh, char_fmt_ptr/WORD_BLOCK_SIZE, FMT_CHARACTER);
}
static void usage(char **argv)
{
fprintf(stderr, "Usage: %s [-3 | -4] [-d] file.doc\n", argv[0]);
}
int main(int argc, char **argv)
{
struct word_handle *wh;
int opt;
g_outfile = stdout;
while ((opt = getopt(argc, argv, "34do:")) != -1) {
switch (opt) {
case '3':
g_mode = MODE_3;
break;
case '4':
g_mode = MODE_4;
break;
case 'd':
g_debug = 1;
break;
case 'o':
g_outfile = fopen(optarg, "w");
if (!g_outfile) {
perror("open outfile");
exit(1);
}
break;
default:
usage(argv);
exit(2);
}
}
if (optind >= argc) {
usage(argv);
exit(2);
}
DBG("Opening file name '%s'\n", argv[optind]);
wh = word_file_open(argv[optind]);
if (!wh)
exit(1);
process(wh);
}
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