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