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winDumpExts.c

/* 
 * winDumpExts.c --
 * Author:   Gordon Chaffee, Scott Stanton
 *
 * History:  The real functionality of this file was written by
 *           Matt Pietrek in 1993 in his pedump utility.  I've
 *           modified it to dump the externals in a bunch of object
 *           files to create a .def file.
 *
 * 10/12/95  Modified by Scott Stanton to support Relocatable Object Module
 *         Format files for Borland C++ 4.5.
 *
 * Notes:    Visual C++ puts an underscore before each exported symbol.
 *           This file removes them.  I don't know if this is a problem
 *           this other compilers.  If _MSC_VER is defined,
 *           the underscore is removed.  If not, it isn't.  To get a
 *           full dump of an object file, use the -f option.  This can
 *           help determine the something that may be different with a
 *           compiler other than Visual C++.
 *----------------------------------------------------------------------
 *
 * RCS: @(#) $Id: winDumpExts.c,v 1.3 1999/02/02 22:32:17 stanton Exp $
 */

#include <windows.h>
#include <stdio.h>
#include <string.h>
#include <process.h>

#ifdef _ALPHA_
#define e_magic_number IMAGE_FILE_MACHINE_ALPHA
#else
#define e_magic_number IMAGE_FILE_MACHINE_I386
#endif

/*
 *----------------------------------------------------------------------
 * GetArgcArgv --
 * 
 *    Break up a line into argc argv
 *----------------------------------------------------------------------
 */
int
GetArgcArgv(char *s, char **argv)
{
    int quote = 0;
    int argc = 0;
    char *bp;

    bp = s;
    while (1) {
      while (isspace(*bp)) {
          bp++;
      }
      if (*bp == '\n' || *bp == '\0') {
          *bp = '\0';
          return argc;
      }
      if (*bp == '\"') {
          quote = 1;
          bp++;
      }
      argv[argc++] = bp;

      while (*bp != '\0') {
          if (quote) {
            if (*bp == '\"') {
                quote = 0;
                *bp = '\0';
                bp++;
                break;
            }
            bp++;
            continue;
          }
          if (isspace(*bp)) {
            *bp = '\0';
            bp++;
            break;
          }
          bp++;
      }
    }
}

/*
 *  The names of the first group of possible symbol table storage classes
 */
char * SzStorageClass1[] = {
    "NULL","AUTOMATIC","EXTERNAL","STATIC","REGISTER","EXTERNAL_DEF","LABEL",
    "UNDEFINED_LABEL","MEMBER_OF_STRUCT","ARGUMENT","STRUCT_TAG",
    "MEMBER_OF_UNION","UNION_TAG","TYPE_DEFINITION","UNDEFINED_STATIC",
    "ENUM_TAG","MEMBER_OF_ENUM","REGISTER_PARAM","BIT_FIELD"
};

/*
 * The names of the second group of possible symbol table storage classes
 */
char * SzStorageClass2[] = {
    "BLOCK","FUNCTION","END_OF_STRUCT","FILE","SECTION","WEAK_EXTERNAL"
};

/*
 *----------------------------------------------------------------------
 * GetSZStorageClass --
 *
 *    Given a symbol storage class value, return a descriptive
 *    ASCII string
 *----------------------------------------------------------------------
 */
PSTR
GetSZStorageClass(BYTE storageClass)
{
      if ( storageClass <= IMAGE_SYM_CLASS_BIT_FIELD )
            return SzStorageClass1[storageClass];
      else if ( (storageClass >= IMAGE_SYM_CLASS_BLOCK)
                  && (storageClass <= IMAGE_SYM_CLASS_WEAK_EXTERNAL) )
            return SzStorageClass2[storageClass-IMAGE_SYM_CLASS_BLOCK];
      else
            return "???";
}

/*
 *----------------------------------------------------------------------
 * GetSectionName --
 *
 *    Used by DumpSymbolTable, it gives meaningful names to
 *    the non-normal section number.
 *
 * Results:
 *    A name is returned in buffer
 *----------------------------------------------------------------------
 */
void
GetSectionName(WORD section, PSTR buffer, unsigned cbBuffer)
{
    char tempbuffer[10];
      
    switch ( (SHORT)section )
    {
      case IMAGE_SYM_UNDEFINED: strcpy(tempbuffer, "UNDEF"); break;
      case IMAGE_SYM_ABSOLUTE:  strcpy(tempbuffer, "ABS  "); break;
      case IMAGE_SYM_DEBUG:     strcpy(tempbuffer, "DEBUG"); break;
      default: wsprintf(tempbuffer, "%-5X", section);
    }
      
    strncpy(buffer, tempbuffer, cbBuffer-1);
}

/*
 *----------------------------------------------------------------------
 * DumpSymbolTable --
 *
 *    Dumps a COFF symbol table from an EXE or OBJ.  We only use
 *    it to dump tables from OBJs.
 *----------------------------------------------------------------------
 */
void
DumpSymbolTable(PIMAGE_SYMBOL pSymbolTable, FILE *fout, unsigned cSymbols)
{
    unsigned i;
    PSTR stringTable;
    char sectionName[10];
      
    fprintf(fout, "Symbol Table - %X entries  (* = auxillary symbol)\n",
          cSymbols);

    fprintf(fout, 
     "Indx Name                 Value    Section    cAux  Type    Storage\n"
     "---- -------------------- -------- ---------- ----- ------- --------\n");

    /*
     * The string table apparently starts right after the symbol table
     */
    stringTable = (PSTR)&pSymbolTable[cSymbols]; 
            
    for ( i=0; i < cSymbols; i++ ) {
      fprintf(fout, "%04X ", i);
      if ( pSymbolTable->N.Name.Short != 0 )
          fprintf(fout, "%-20.8s", pSymbolTable->N.ShortName);
      else
          fprintf(fout, "%-20s", stringTable + pSymbolTable->N.Name.Long);

      fprintf(fout, " %08X", pSymbolTable->Value);

      GetSectionName(pSymbolTable->SectionNumber, sectionName,
                   sizeof(sectionName));
      fprintf(fout, " sect:%s aux:%X type:%02X st:%s\n",
             sectionName,
             pSymbolTable->NumberOfAuxSymbols,
             pSymbolTable->Type,
             GetSZStorageClass(pSymbolTable->StorageClass) );
#if 0
      if ( pSymbolTable->NumberOfAuxSymbols )
          DumpAuxSymbols(pSymbolTable);
#endif

      /*
       * Take into account any aux symbols
       */
      i += pSymbolTable->NumberOfAuxSymbols;
      pSymbolTable += pSymbolTable->NumberOfAuxSymbols;
      pSymbolTable++;
    }
}

/*
 *----------------------------------------------------------------------
 * DumpExternals --
 *
 *    Dumps a COFF symbol table from an EXE or OBJ.  We only use
 *    it to dump tables from OBJs.
 *----------------------------------------------------------------------
 */
void
DumpExternals(PIMAGE_SYMBOL pSymbolTable, FILE *fout, unsigned cSymbols)
{
    unsigned i;
    PSTR stringTable;
    char *s, *f;
    char symbol[1024];
      
    /*
     * The string table apparently starts right after the symbol table
     */
    stringTable = (PSTR)&pSymbolTable[cSymbols]; 
            
    for ( i=0; i < cSymbols; i++ ) {
      if (pSymbolTable->SectionNumber > 0 && pSymbolTable->Type == 0x20) {
          if (pSymbolTable->StorageClass == IMAGE_SYM_CLASS_EXTERNAL) {
            if (pSymbolTable->N.Name.Short != 0) {
                strncpy(symbol, pSymbolTable->N.ShortName, 8);
                symbol[8] = 0;
            } else {
                s = stringTable + pSymbolTable->N.Name.Long;
                strcpy(symbol, s);
            }
            s = symbol;

            /*
             * Skip to the last @ and ensure it is followed by digits,
             * otherwise it is probably part of a C++ mangled name.
             */

            f = strrchr(s, '@');
            if (f && f[1] >= '0' && f[1] <= '9') {
                *f = 0;
            }
#if defined(_MSC_VER) && defined(_X86_)
            if (symbol[0] == '_') {
                s = &symbol[1];
            }
#endif
            if ((stricmp(s, "DllEntryPoint") != 0) 
                  && (stricmp(s, "DllMain") != 0)) {
                fprintf(fout, "\t%s\n", s);
            }
          }
      }

      /*
       * Take into account any aux symbols
       */
      i += pSymbolTable->NumberOfAuxSymbols;
      pSymbolTable += pSymbolTable->NumberOfAuxSymbols;
      pSymbolTable++;
    }
}

/*
 *----------------------------------------------------------------------
 * DumpObjFile --
 *
 *    Dump an object file--either a full listing or just the exported
 *    symbols.
 *----------------------------------------------------------------------
 */
void
DumpObjFile(PIMAGE_FILE_HEADER pImageFileHeader, FILE *fout, int full)
{
    PIMAGE_SYMBOL PCOFFSymbolTable;
    DWORD COFFSymbolCount;
    
    PCOFFSymbolTable = (PIMAGE_SYMBOL)
      ((DWORD)pImageFileHeader + pImageFileHeader->PointerToSymbolTable);
    COFFSymbolCount = pImageFileHeader->NumberOfSymbols;

    if (full) {
      DumpSymbolTable(PCOFFSymbolTable, fout, COFFSymbolCount);
    } else {
      DumpExternals(PCOFFSymbolTable, fout, COFFSymbolCount);
    }
}

/*
 *----------------------------------------------------------------------
 * SkipToNextRecord --
 *
 *    Skip over the current ROMF record and return the type of the
 *    next record.
 *----------------------------------------------------------------------
 */

BYTE
SkipToNextRecord(BYTE **ppBuffer)
{
    int length;
    (*ppBuffer)++;            /* Skip over the type.*/
    length = *((WORD*)(*ppBuffer))++; /* Retrieve the length. */
    *ppBuffer += length;      /* Skip over the rest. */
    return **ppBuffer;        /* Return the type. */
}

/*
 *----------------------------------------------------------------------
 * DumpROMFObjFile --
 *
 *    Dump a Relocatable Object Module Format file, displaying only
 *    the exported symbols.
 *----------------------------------------------------------------------
 */
void
DumpROMFObjFile(LPVOID pBuffer, FILE *fout)
{
    BYTE type, length;
    char symbol[1024], *s;

    while (1) {
      type = SkipToNextRecord(&(BYTE*)pBuffer);
      if (type == 0x90) {     /* PUBDEF */
          if (((BYTE*)pBuffer)[4] != 0) {
            length = ((BYTE*)pBuffer)[5];
            strncpy(symbol, ((char*)pBuffer) + 6, length);
            symbol[length] = '\0';
            s = symbol;
            if ((stricmp(s, "DllEntryPoint") != 0) 
                  && (stricmp(s, "DllMain") != 0)) {
                if (s[0] == '_') {
                  s++;
                  fprintf(fout, "\t_%s\n\t%s=_%s\n", s, s, s);
                } else {
                  fprintf(fout, "\t%s\n", s);
                }
            }
          }
      } else if (type == 0x8B || type == 0x8A) { /* MODEND */
          break;
      }
    }
}

/*
 *----------------------------------------------------------------------
 * DumpFile --
 *
 *    Open up a file, memory map it, and call the appropriate
 *    dumping routine
 *----------------------------------------------------------------------
 */
void
DumpFile(LPSTR filename, FILE *fout, int full)
{
    HANDLE hFile;
    HANDLE hFileMapping;
    LPVOID lpFileBase;
    PIMAGE_DOS_HEADER dosHeader;
      
    hFile = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL,
                   OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
                              
    if (hFile == INVALID_HANDLE_VALUE) {
      fprintf(stderr, "Couldn't open file with CreateFile()\n");
      return;
    }

    hFileMapping = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
    if (hFileMapping == 0) {
      CloseHandle(hFile);
      fprintf(stderr, "Couldn't open file mapping with CreateFileMapping()\n");
      return;
    }

    lpFileBase = MapViewOfFile(hFileMapping, FILE_MAP_READ, 0, 0, 0);
    if (lpFileBase == 0) {
      CloseHandle(hFileMapping);
      CloseHandle(hFile);
      fprintf(stderr, "Couldn't map view of file with MapViewOfFile()\n");
      return;
    }

    dosHeader = (PIMAGE_DOS_HEADER)lpFileBase;
    if (dosHeader->e_magic == IMAGE_DOS_SIGNATURE) {
#if 0
      DumpExeFile( dosHeader );
#else
      fprintf(stderr, "File is an executable.  I don't dump those.\n");
      return;
#endif
    }
    /* Does it look like a i386 COFF OBJ file??? */
    else if ((dosHeader->e_magic == e_magic_number)
          && (dosHeader->e_sp == 0)) {
      /*
       * The two tests above aren't what they look like.  They're
       * really checking for IMAGE_FILE_HEADER.Machine == i386 (0x14C)
       * and IMAGE_FILE_HEADER.SizeOfOptionalHeader == 0;
       */
      DumpObjFile((PIMAGE_FILE_HEADER) lpFileBase, fout, full);
    } else if (*((BYTE *)lpFileBase) == 0x80) {
      /*
       * This file looks like it might be a ROMF file.
       */
      DumpROMFObjFile(lpFileBase, fout);
    } else {
      printf("unrecognized file format\n");
    }
    UnmapViewOfFile(lpFileBase);
    CloseHandle(hFileMapping);
    CloseHandle(hFile);
}

void
main(int argc, char **argv)
{
    char *fargv[1000];
    char cmdline[10000];
    int i, arg;
    FILE *fout;
    int pos;
    int full = 0;
    char *outfile = NULL;

    if (argc < 3) {
      Usage:
      fprintf(stderr, "Usage: %s ?-o outfile? ?-f(ull)? <dllname> <object filenames> ..\n", argv[0]);
      exit(1);
    }

    arg = 1;
    while (argv[arg][0] == '-') {
      if (strcmp(argv[arg], "--") == 0) {
          arg++;
          break;
      } else if (strcmp(argv[arg], "-f") == 0) {
          full = 1;
      } else if (strcmp(argv[arg], "-o") == 0) {
          arg++;
          if (arg == argc) {
            goto Usage;
          }
          outfile = argv[arg];
      }
      arg++;
    }
    if (arg == argc) {
      goto Usage;
    }

    if (outfile) {
      fout = fopen(outfile, "w+");
      if (fout == NULL) {
          fprintf(stderr, "Unable to open \'%s\' for writing:\n",
                argv[arg]);
          perror("");
          exit(1);
      }
    } else {
      fout = stdout;
    }
    
    if (! full) {
      char *dllname = argv[arg];
      arg++;
      if (arg == argc) {
          goto Usage;
      }
      fprintf(fout, "EXPORTS\n");
    }

    for (; arg < argc; arg++) {
      if (argv[arg][0] == '@') {
          FILE *fargs = fopen(&argv[arg][1], "r");
          if (fargs == NULL) {
            fprintf(stderr, "Unable to open \'%s\' for reading:\n",
                  argv[arg]);
            perror("");
            exit(1);
          }
          pos = 0;
          for (i = 0; i < arg; i++) {
            strcpy(&cmdline[pos], argv[i]);
            pos += strlen(&cmdline[pos]) + 1;
            fargv[i] = argv[i];
          }
          fgets(&cmdline[pos], sizeof(cmdline), fargs);
          fprintf(stderr, "%s\n", &cmdline[pos]);
          fclose(fargs);
          i += GetArgcArgv(&cmdline[pos], &fargv[i]);
          argc = i;
          argv = fargv;
      }
      DumpFile(argv[arg], fout, full);
    }
    exit(0);
}

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