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|
/* -------------------------------------------------------------- */
/*
* tiny_impdef creates an export definition file (.def) from a dll
* on MS-Windows. Usage: tiny_impdef library.dll [-o outputfile]"
*
* Copyright (c) 2005,2007 grischka
*
* This program 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef TINY_IMPDEF_GET_EXPORT_NAMES_ONLY
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <malloc.h>
char *get_export_names(FILE *fp);
#define tcc_free free
#define tcc_realloc realloc
/* extract the basename of a file */
static char *file_basename(const char *name)
{
const char *p = strchr(name, 0);
while (p > name
&& p[-1] != '/'
&& p[-1] != '\\'
)
--p;
return (char*)p;
}
int main(int argc, char **argv)
{
int ret, v, i;
char infile[MAX_PATH];
char outfile[MAX_PATH];
static const char *ext[] = { ".dll", ".exe", NULL };
const char *file, **pp;
char path[MAX_PATH], *p, *q;
FILE *fp, *op;
infile[0] = 0;
outfile[0] = 0;
fp = op = NULL;
v = 0;
ret = 1;
p = NULL;
for (i = 1; i < argc; ++i) {
const char *a = argv[i];
if ('-' == a[0]) {
if (0 == strcmp(a, "-v")) {
v = 1;
} else if (0 == strcmp(a, "-o")) {
if (++i == argc)
goto usage;
strcpy(outfile, argv[i]);
} else
goto usage;
} else if (0 == infile[0])
strcpy(infile, a);
else
goto usage;
}
if (0 == infile[0]) {
usage:
fprintf(stderr,
"tiny_impdef: create export definition file (.def) from a dll\n"
"Usage: tiny_impdef library.dll [-o outputfile]\n"
);
goto the_end;
}
if (0 == outfile[0])
{
strcpy(outfile, file_basename(infile));
q = strrchr(outfile, '.');
if (NULL == q)
q = strchr(outfile, 0);
strcpy(q, ".def");
}
file = infile;
#ifdef _WIN32
pp = ext;
do if (SearchPath(NULL, file, *pp, sizeof path, path, NULL)) {
file = path;
break;
} while (*pp++);
#endif
fp = fopen(file, "rb");
if (NULL == fp) {
fprintf(stderr, "tiny_impdef: no such file: %s\n", infile);
goto the_end;
}
if (v)
printf("--> %s\n", file);
p = get_export_names(fp);
if (NULL == p) {
fprintf(stderr, "tiny_impdef: could not get exported function names.\n");
goto the_end;
}
op = fopen(outfile, "w");
if (NULL == op) {
fprintf(stderr, "tiny_impdef: could not create output file: %s\n", outfile);
goto the_end;
}
fprintf(op, "LIBRARY %s\n\nEXPORTS\n", file_basename(file));
for (q = p, i = 0; *q; ++i) {
fprintf(op, "%s\n", q);
q += strlen(q) + 1;
}
if (v) {
printf("<-- %s\n", outfile);
printf("%d symbol(s) found\n", i);
}
ret = 0;
the_end:
if (p)
free(p);
if (fp)
fclose(fp);
if (op)
fclose(op);
return ret;
}
/* -------------------------------------------------------------- */
int read_mem(FILE *fp, unsigned offset, void *buffer, unsigned len)
{
fseek(fp, offset, 0);
return len == fread(buffer, 1, len, fp);
}
/* -------------------------------------------------------------- */
#endif
char *get_export_names(FILE *fp)
{
int l, i, n, n0;
char *p;
IMAGE_SECTION_HEADER ish;
IMAGE_EXPORT_DIRECTORY ied;
IMAGE_DOS_HEADER dh;
IMAGE_FILE_HEADER ih;
DWORD sig, ref, addr, ptr, namep;
#ifdef TCC_TARGET_X86_64
IMAGE_OPTIONAL_HEADER64 oh;
const int MACHINE = 0x8664;
#else
IMAGE_OPTIONAL_HEADER32 oh;
const int MACHINE = 0x014C;
#endif
int pef_hdroffset, opt_hdroffset, sec_hdroffset;
n = n0 = 0;
p = NULL;
if (!read_mem(fp, 0, &dh, sizeof dh))
goto the_end;
if (!read_mem(fp, dh.e_lfanew, &sig, sizeof sig))
goto the_end;
if (sig != 0x00004550)
goto the_end;
pef_hdroffset = dh.e_lfanew + sizeof sig;
if (!read_mem(fp, pef_hdroffset, &ih, sizeof ih))
goto the_end;
if (MACHINE != ih.Machine)
goto the_end;
opt_hdroffset = pef_hdroffset + sizeof ih;
sec_hdroffset = opt_hdroffset + sizeof oh;
if (!read_mem(fp, opt_hdroffset, &oh, sizeof oh))
goto the_end;
if (IMAGE_DIRECTORY_ENTRY_EXPORT >= oh.NumberOfRvaAndSizes)
goto the_end;
addr = oh.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
//printf("addr: %08x\n", addr);
for (i = 0; i < ih.NumberOfSections; ++i) {
if (!read_mem(fp, sec_hdroffset + i * sizeof ish, &ish, sizeof ish))
goto the_end;
//printf("vaddr: %08x\n", ish.VirtualAddress);
if (addr >= ish.VirtualAddress && addr < ish.VirtualAddress + ish.SizeOfRawData)
goto found;
}
goto the_end;
found:
ref = ish.VirtualAddress - ish.PointerToRawData;
if (!read_mem(fp, addr - ref, &ied, sizeof ied))
goto the_end;
namep = ied.AddressOfNames - ref;
for (i = 0; i < ied.NumberOfNames; ++i) {
if (!read_mem(fp, namep, &ptr, sizeof ptr))
goto the_end;
namep += sizeof ptr;
for (l = 0;;) {
if (n+1 >= n0)
p = tcc_realloc(p, n0 = n0 ? n0 * 2 : 256);
if (!read_mem(fp, ptr - ref + l, p + n, 1) || ++l >= 80) {
tcc_free(p), p = NULL;
goto the_end;
}
if (p[n++] == 0)
break;
}
}
if (p)
p[n] = 0;
the_end:
return p;
}
/* -------------------------------------------------------------- */
|
