win32/tools/tiny_impdef.c

   1 /* -------------------------------------------------------------- */
   2 /*
   3  * tiny_impdef creates an export definition file (.def) from a dll
   4  * on MS-Windows. Usage: tiny_impdef library.dll [-o outputfile]"
   5  *
   6  *  Copyright (c) 2005,2007 grischka
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #ifndef TINY_IMPDEF_GET_EXPORT_NAMES_ONLY
  24
  25 #define WIN32_LEAN_AND_MEAN
  26 #include <windows.h>
  27 #include <stdio.h>
  28 #include <io.h>
  29 #include <malloc.h>
  30
  31 char *get_export_names(int fd);
  32 #define tcc_free free
  33 #define tcc_realloc realloc
  34
  35 /* extract the basename of a file */
  36 static char *file_basename(const char *name)
  37 {
  38     const char *p = strchr(name, 0);
  39     while (p > name
  40         && p[-1] != '/'
  41         && p[-1] != '\\'
  42         )
  43         --p;
  44     return (char*)p;
  45 }
  46
  47 int main(int argc, char **argv)
  48 {
  49     int ret, v, i;
  50     char infile[MAX_PATH];
  51     char outfile[MAX_PATH];
  52
  53     static const char *ext[] = { ".dll", ".exe", NULL };
  54     const char *file, **pp;
  55     char path[MAX_PATH], *p, *q;
  56     FILE *fp, *op;
  57
  58     infile[0] = 0;
  59     outfile[0] = 0;
  60     fp = op = NULL;
  61     v = 0;
  62     ret = 1;
  63     p = NULL;
  64
  65     for (i = 1; i < argc; ++i) {
  66         const char *a = argv[i];
  67         if ('-' == a[0]) {
  68             if (0 == strcmp(a, "-v")) {
  69                 v = 1;
  70             } else if (0 == strcmp(a, "-o")) {
  71                 if (++i == argc)
  72                     goto usage;
  73                 strcpy(outfile, argv[i]);
  74             } else
  75                 goto usage;
  76         } else if (0 == infile[0])
  77             strcpy(infile, a);
  78         else
  79             goto usage;
  80     }
  81
  82     if (0 == infile[0]) {
  83 usage:
  84         fprintf(stderr,
  85             "tiny_impdef: create export definition file (.def) from a dll\n"
  86             "Usage: tiny_impdef library.dll [-o outputfile]\n"
  87             );
  88         goto the_end;
  89     }
  90
  91     if (0 == outfile[0])
  92     {
  93         strcpy(outfile, file_basename(infile));
  94         q = strrchr(outfile, '.');
  95         if (NULL == q)
  96             q = strchr(outfile, 0);
  97         strcpy(q, ".def");
  98     }
  99
 100     file = infile;
 101
 102 #ifdef _WIN32
 103     pp = ext;
 104     do if (SearchPath(NULL, file, *pp, sizeof path, path, NULL)) {
 105        file = path;
 106        break;
 107     } while (*pp++);
 108 #endif
 109
 110     fp = fopen(file, "rb");
 111     if (NULL == fp) {
 112         fprintf(stderr, "tiny_impdef: no such file: %s\n", infile);
 113         goto the_end;
 114     }
 115     if (v)
 116         printf("--> %s\n", file);
 117
 118     p = get_export_names(fileno(fp));
 119     if (NULL == p) {
 120         fprintf(stderr, "tiny_impdef: could not get exported function names.\n");
 121         goto the_end;
 122     }
 123
 124     op = fopen(outfile, "w");
 125     if (NULL == op) {
 126         fprintf(stderr, "tiny_impdef: could not create output file: %s\n", outfile);
 127         goto the_end;
 128     }
 129
 130     fprintf(op, "LIBRARY %s\n\nEXPORTS\n", file_basename(file));
 131     for (q = p, i = 0; *q; ++i) {
 132         fprintf(op, "%s\n", q);
 133         q += strlen(q) + 1;
 134     }
 135
 136     if (v) {
 137         printf("<-- %s\n", outfile);
 138         printf("%d symbol(s) found\n", i);
 139     }
 140
 141     ret = 0;
 142
 143 the_end:
 144     if (p)
 145         free(p);
 146     if (fp)
 147         fclose(fp);
 148     if (op)
 149         fclose(op);
 150     return ret;
 151 }
 152
 153 int read_mem(int fd, unsigned offset, void *buffer, unsigned len)
 154 {
 155     lseek(fd, offset, SEEK_SET);
 156     return len == read(fd, buffer, len);
 157 }
 158
 159 /* -------------------------------------------------------------- */
 160
 161 /* -------------------------------------------------------------- */
 162 #endif
 163
 164 char *get_export_names(int fd)
 165 {
 166     int l, i, n, n0;
 167     char *p;
 168
 169     IMAGE_SECTION_HEADER ish;
 170     IMAGE_EXPORT_DIRECTORY ied;
 171     IMAGE_DOS_HEADER dh;
 172     IMAGE_FILE_HEADER ih;
 173     DWORD sig, ref, addr, ptr, namep;
 174 #ifdef TCC_TARGET_X86_64
 175     IMAGE_OPTIONAL_HEADER64 oh;
 176     const int MACHINE = 0x8664;
 177 #else
 178     IMAGE_OPTIONAL_HEADER32 oh;
 179     const int MACHINE = 0x014C;
 180 #endif
 181     int pef_hdroffset, opt_hdroffset, sec_hdroffset;
 182
 183     n = n0 = 0;
 184     p = NULL;
 185
 186     if (!read_mem(fd, 0, &dh, sizeof dh))
 187         goto the_end;
 188     if (!read_mem(fd, dh.e_lfanew, &sig, sizeof sig))
 189         goto the_end;
 190     if (sig != 0x00004550)
 191         goto the_end;
 192     pef_hdroffset = dh.e_lfanew + sizeof sig;
 193     if (!read_mem(fd, pef_hdroffset, &ih, sizeof ih))
 194         goto the_end;
 195     if (MACHINE != ih.Machine)
 196         goto the_end;
 197     opt_hdroffset = pef_hdroffset + sizeof ih;
 198     sec_hdroffset = opt_hdroffset + sizeof oh;
 199     if (!read_mem(fd, opt_hdroffset, &oh, sizeof oh))
 200         goto the_end;
 201
 202     if (IMAGE_DIRECTORY_ENTRY_EXPORT >= oh.NumberOfRvaAndSizes)
 203         goto the_end;
 204
 205     addr = oh.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
 206     //printf("addr: %08x\n", addr);
 207     for (i = 0; i < ih.NumberOfSections; ++i) {
 208         if (!read_mem(fd, sec_hdroffset + i * sizeof ish, &ish, sizeof ish))
 209             goto the_end;
 210         //printf("vaddr: %08x\n", ish.VirtualAddress);
 211         if (addr >= ish.VirtualAddress && addr < ish.VirtualAddress + ish.SizeOfRawData)
 212             goto found;
 213     }
 214     goto the_end;
 215
 216 found:
 217     ref = ish.VirtualAddress - ish.PointerToRawData;
 218     if (!read_mem(fd, addr - ref, &ied, sizeof ied))
 219         goto the_end;
 220
 221     namep = ied.AddressOfNames - ref;
 222     for (i = 0; i < ied.NumberOfNames; ++i) {
 223         if (!read_mem(fd, namep, &ptr, sizeof ptr))
 224             goto the_end;
 225         namep += sizeof ptr;
 226         for (l = 0;;) {
 227             if (n+1 >= n0)
 228                 p = tcc_realloc(p, n0 = n0 ? n0 * 2 : 256);
 229             if (!read_mem(fd, ptr - ref + l++, p + n, 1)) {
 230                 tcc_free(p), p = NULL;
 231                 goto the_end;
 232             }
 233             if (p[n++] == 0)
 234                 break;
 235         }
 236     }
 237     if (p)
 238         p[n] = 0;
 239 the_end:
 240     return p;
 241 }
 242
 243 /* -------------------------------------------------------------- */