c - 来自平面汇编器的 Visual Studio LNK1107 : invalid or corrupt file - . obj (COFF)

Question

我正在尝试编译某人的程序，该程序部分用汇编程序编写，部分用 C 语言编写。该程序有编译版本，但我需要对其进行一些更改。该程序的源代码由1个.c文件和1个.asm文件组成。在不做任何更改的情况下，我尝试在 Visual Studio 2017 和 Flat Assembler(版本 1.73)中编译该程序。我编译了 .asm 文件，Flat Assembler 给了我 .obj 文件(unlzws4.obj)。然后我在 VS 中创建了一个新的空项目，并从 FASM 导入了 .c 文件和 .obj 文件。

问题就出现在这里。在编译过程中，Visual Studio 给出了以下链接错误:

1>------ Rebuild All started: Project: unlibs4, Configuration: Debug Win32 ------
1>unlibs4.c
1>unlzws4.obj : fatal error LNK1107: invalid or corrupt file: cannot read at 0x10EE4
1>Done building project "unlibs4.vcxproj" -- FAILED.
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

我试图找出出现此错误的原因，但没有结果。代码应该是正确的。

unlibs4.c 文件:

// (c) CTPAX-X Team 2018 http://www.CTPAX-X.org/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <windows.h>

#ifdef GCC32HACK
#include "win32gcc.h"
#endif

#define S4L_REVISION 0x1000
#define S4F_PACKED   1
#define S4F_CRYPTED  2
#pragma pack(push, 1)
typedef struct
{
    DWORD headsize; /* size of this header with all data */
    DWORD revision; /* MUST be equal to 0x1000 */
    DWORD dnamelen; /* directory names block len */
    DWORD dcounter; /* directory count in block  */
    DWORD fnamelen; /* file names block len */
    DWORD fcounter; /* files counter */
} headinfo;

typedef struct
{
    DWORD floffs; /* looks like first always 1 (.LIB file starts with one zero byte) */
    DWORD pksize; /* packed size */
    DWORD unsize; /* unpacked size (zero if file not packed) */
    DWORD dindex; /* directory name index */
    DWORD xflags; /* flags: 1 - packed; 2 - crypted; */
    DWORD crcsum; /* file CRC (16 bit); can be zero; only for packed files? */
} fileinfo;
#pragma pack(pop)


extern void WINAPI unlzws4(BYTE *undata, DWORD *unsize, BYTE *pkdata, DWORD *pksize);

int main(int argc, char *argv[])
{
    char *dnames, *fnames, *s, *d, name[MAX_PATH];
    fileinfo *list;
    FILE *fl, *f;
    headinfo hi;
    DWORD i, j;
    BYTE *p, *u;
    printf("The Settlers IV .LIB unpacker v1.0\n(c) CTPAX-X Team 2018\nhttp://www.CTPAX-X.org/\n\n");
    if (argc != 2)
    {
        printf("Usage: unlibs4 <filename.lib>\n\n");
        return(1);
    }
    fl = fopen(argv[1], "rb");
    if (!fl)
    {
        printf("Error: can't open input file.\n\n");
        return(2);
    }
    /* read TOC offs */
    fseek(fl, 0, SEEK_END);
    fseek(fl, ftell(fl) - 4, SEEK_SET);
    fread(&i, 4, 1, fl);
    /* read TOC */
    fseek(fl, i, SEEK_SET);
    memset(&hi, 0, sizeof(hi));
    fread(&hi, sizeof(hi), 1, fl);
    if (hi.revision != S4L_REVISION)
    {
        fclose(fl);
        printf("Error: invalid/unknown input file format.\n\n");
        return(3);
    }
    /* allocate memory */
    dnames = (char *)malloc(hi.dnamelen);
    fnames = (char *)malloc(hi.fnamelen);
    list = (fileinfo *)malloc(hi.fcounter * sizeof(list[0]));
    if (dnames && fnames && list)
    {
        /* read strings */
        fread(dnames, hi.dnamelen, 1, fl);
        fread(fnames, hi.fnamelen, 1, fl);
        /* read file infos */
        fread(list, hi.fcounter, sizeof(list[0]), fl);
        /* create all directories before */
        d = dnames;
        for (i = 0; i < hi.dcounter; i++)
        {
            CreateDirectory(d, NULL);
            d += strlen(d) + 1;
        }
        /* unpack */
        s = fnames;
        for (i = 0; i < hi.fcounter; i++)
        {
            /* find directory name */
            d = dnames;
            j = list[i].dindex;
            while (j > 0)
            {
                d += strlen(d) + 1;
                j--;
            }
            /* merge directory with file */
            sprintf(name, "%s\\%s", d, s);
            /* dump to disk */
            printf("%s\n", name);
            f = fopen(name, "wb");
            if (f)
            {
                p = (BYTE *)malloc(list[i].pksize);
                if (p)
                {
                    fseek(fl, list[i].floffs, SEEK_SET);
                    fread(p, list[i].pksize, 1, fl);
                    if (list[i].xflags & S4F_CRYPTED)
                    {
                        printf("Warning: encrypted file, but decryption not supported - saving as is.\n");
                    }
                    /* decryption not supported, that's why '==' instead of just '&' */
                    if ((list[i].xflags & (S4F_CRYPTED | S4F_PACKED)) == S4F_PACKED)
                    {
                        u = (BYTE *)malloc(list[i].unsize);
                        if (u)
                        {
                            j = list[i].unsize;
                            unlzws4(u, &list[i].unsize, p, &list[i].pksize);
                            free(p);
                            p = u;
                            list[i].pksize = j;
                        }
                    }
                    fwrite(p, list[i].pksize, 1, f);
                    free(p);
                }
                fclose(f);
            }
            /* next filename */
            s += strlen(s) + 1;
        }
        printf("\ndone\n\n");
    }
    if (dnames) { free(dnames); }
    if (fnames) { free(fnames); }
    if (list) { free(list); }
    fclose(fl);
    return(0);
}

unlzws4.asm 文件的开头:

; To compile this source code you'll need FASM:
; http://flatassembler.net/
FORMAT COFF

include 'win32ax.inc'

; define section so this can be merged to the code block
section '.text' code

public @startup as '_unlzws4@16'

; some consts
;dword_616478 - start
dword_6167E0 = buf_all + 6167E0h - 616478h
dword_6167E4 = buf_all + 6167E4h - 616478h
dword_616DF8 = buf_all + 616DF8h - 616478h
dword_617060 = buf_all + 617060h - 616478h
dword_617064 = buf_all + 617064h - 616478h

; ###########################################################################

; some startup initialization code
@startup:
  push    esi
  push    edi
  xor     eax, eax
  cld
  ; clear all buffers
  mov     edi, buf_65536
  mov     ecx, 65536 / 4
  rep stosd
  ; ---
  mov     edi, buf_548
  mov     ecx, 548 / 4
  rep     stosd
  ; reinit static buffer since it can be modified due unpacking (sic!)
  mov     esi, dword_616478
  mov     edi, buf_all
  mov     ecx, (3112d + 152d) / 4
  rep     movsd
  ; ---
  pop     edi
  pop     esi
  ; emulate some class structure
  mov     ecx, _buf
  ; jump to the actual unpacking routine
  jmp     @sub_573090

; ###########################################################################

@sub_572450:
var_4           = -4
arg_0           =  4
arg_4           =  8
  push    ecx
  push    ebx
  mov     ebx, [esp+8+arg_0]
  push    ebp
  mov     ebp, [esp+0Ch+arg_4]
  push    esi
  push    edi
  mov     esi, 28h
@loc_572462:

...

我对汇编程序了解不多，我只需要更改程序的C部分并将其编译为.dll库。我想知道该错误是否只是因为 Visual Studio 项目中的某些设置而出现。一切都设置为默认选项。

Answer 1

要使用 Microsoft 链接器进行链接，您需要有 MSCOFF 格式的目标文件。你在哪里

FORMAT COFF

您需要:

FORMAT MS COFF

来自https://flatassembler.net/docs.php?article=manual#2.4.3 :

2.4.3 Common Object File Format

To select Common Object File Format, use format COFF or format MS COFF directive, depending whether you want to create classic (DJGPP) or Microsoft's variant of COFF file. The default code setting for this format is 32-bit. To create the file in Microsoft's COFF format for the x86-64 architecture, use format MS64 COFF setting, in such case long mode code is generated by default.