/*
 * cstub.c
 *
 * Create DLL stublib
 *
 * © 1994-1998 Straylight
 */

/*----- Licensing note ----------------------------------------------------*
 *
 * This file is part of Straylight's Dynamic Linking System (SDLS)
 *
 * SDLS 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, or (at your option)
 * any later version.
 *
 * SDLS 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 SDLS.  If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>

#include "cstub.h"
#include "readdef.h"
#include "aof/aof.h"
#include "aof/chunk.h"
#include "hashtable.h"
#include "error.h"

typedef struct
{
  aof_file f;
  int areaname;
  int abase;
  hashtable osym;
}
cstub__thing;

#define cstub__MAGIC 0x004c4c44
#define cstub__VERSION 100

static int term;

static void cstub__enames(char *p,unsigned ord,void *handle)
{
  cstub__thing *t=handle;
  if (ord==0xFFFFFFFF && hash_find(t->osym,p))
    aof_string(p,t->f.area);
}

static void cstub__entries(char *p,unsigned ord,void *handle)
{
  cstub__thing *t=handle;
  static int entry[1]={0xE3A0F000};		/* MOV	PC,#0		*/
  if (hash_find(t->osym,p))
  {
    aof_addsym(p,t->f.area->next-t->abase,0,t->areaname,&t->f);
    if (ord==0xFFFFFFFF)
    {
      aof_add(entry,t->f.area);
      term=1;
    }
    else
      aof_add(ord,t->f.area);
  }
}

void cstub(char *name,readdef_info *inf,hashtable osym)
{
  FILE *fp;
  char buffer[256];

  if (!inf->apptbl)
  {
    /* --- Don't check if we're creating application stubs --- */

    if (!inf->name[0])
    {
      if (!(inf->errored & rd_name))
        error(NONAME);
      inf->errored|=rd_name;
    }
    if (inf->version==-1)
    {
      if (!(inf->errored & rd_version))
        error(NOVERSION);
      inf->errored|=rd_version;
      inf->version=100;
    }
    if (inf->errored & rd_name)
      return;
  }

  fp=fopen(name,"wb");			/* Open the output file		*/
  if (!fp)				/* If the file wasn't opened	*/
    error(NOOPENOUT,name);		/* Better give an error		*/
  else
  {
    char _buf[sizeof(chunk_fixedHeader)+5*sizeof(chunk_tableEntry)];
    chunk_header *h=(chunk_header *)&_buf; /* Allocate memory easily :-) */

    aof_chunkinfo obj_idfn={0};
    aof_chunkinfo obj_head={0};
    aof_chunkinfo obj_area={0};
    aof_chunkinfo obj_symt={0};
    aof_chunkinfo obj_strt={0};
    aof_chunkinfo reloc={0};
    cstub__thing t;

    int o;
    int osize=0;
    int orelocs=0;

    int sym_dllName;
    int sym_dllEntries;
    int sym_dllStubs;
    int tmp;

    t.f.area=&obj_area;
    t.osym=osym;
    t.f.symt=&obj_symt;
    t.f.strt=&obj_strt;
    t.f.reloc=&reloc;

    h->hdr.id=chunk_MAGIC;		/* Fill in magic thingy		*/
    h->hdr.maxChunks=h->hdr.numChunks=5; /* And number of chunks	*/

    aof_string("Straylight Dynamic Link Library building system 1.01",
                 &obj_idfn);
    aof_align(obj_idfn);

    aof_int(0,&obj_strt);

    aof_int((int)aof_RELOC,&obj_head);
    aof_int(150,&obj_head);
    aof_int((inf->apptbl ? 1 : 3),&obj_head);
    aof_int(obj_symt.next/sizeof(aof_symbol),&obj_head);
    aof_int(0,&obj_head);
    aof_int(0,&obj_head);

    /* --- Do entry names for dll table --- */

    if (inf->apptbl)
      t.areaname=aof_string("DLL$$AppEntry",&obj_strt);
    else
      t.areaname=aof_string("DLL$$Strings",&obj_strt);
    t.abase=obj_area.next;

    if (!inf->apptbl)
    {
      sym_dllName=obj_symt.next/16;
      aof_addsym("_dll_name",
                 obj_area.next-t.abase,
                 1,
                 t.areaname,
                 &t.f);

      if (inf->dllpath)
      {
        sprintf(buffer,"%s[%s]",inf->dllpath,inf->name);
        aof_string(buffer,&obj_area);
      }
      else
      {
        sprintf(buffer,"[%s]",inf->name);
        aof_string(buffer,&obj_area);
      }

      sym_dllEntries=obj_symt.next/16;
      aof_addsym("_dll_entries",
                 obj_area.next-t.abase,
                 1,
                 t.areaname,
                 &t.f);

      /* --- Hack for link v. 5.00 --- *
       *
       * We IMPORT the symbol _dll_findall in order to ensure that DLLLib
       * gets linked in.
       */

      {
        aof_symbol sym={0};
        sym.name=aof_string("_dll_findall",&obj_strt);
        sym.defined=0;
        sym.export=1;
        aof_add(sym,&obj_symt);
      }
    }
    else
    {
      aof_addsym("DLL$$AppEntryNames",
                 obj_area.next-t.abase,
                 0,
                 t.areaname,
                 &t.f);
    }

    hash_enumOrdered(inf->sym,cstub__enames,&t);

    { char c=0; aof_add(c,&obj_area); }

    aof_align(obj_area);

    if (!inf->apptbl)
    {
      aof_int(t.areaname,&obj_head);
      aof_int(0x00002202,&obj_head);
      aof_int(obj_area.next-osize,&obj_head);
      aof_int(reloc.next/8-orelocs,&obj_head);
      aof_int(0,&obj_head);
      aof_addBlock(reloc.p,reloc.next,&obj_area);
      osize=obj_area.next;
      orelocs=reloc.next/8;

      /* --- Do entry veneers table --- */

      t.areaname=aof_string("DLL$$Stubs",&obj_strt);
      t.abase=obj_area.next;

      sym_dllStubs=obj_symt.next/16;
      aof_addsym("_dll_stubs",
                 obj_area.next-t.abase,
                 1,
                 t.areaname,
                 &t.f);
    }
    else
    {
      aof_addsym("DLL$$AppEntryStubs",
                 obj_area.next-t.abase,
                 0,
                 t.areaname,
                 &t.f);
    }

    term=0;
    hash_enumOrdered(inf->sym,cstub__entries,&t);
    if (!term)
      aof_int(-1,&obj_area);

    aof_align(obj_area);

    aof_int(t.areaname,&obj_head);
    aof_int(0x00002202,&obj_head);
    aof_int(obj_area.next-osize,&obj_head);
    aof_int(reloc.next/8-orelocs,&obj_head);
    aof_int(0,&obj_head);
    aof_addBlock(reloc.p,reloc.next,&obj_area);
    osize=obj_area.next;
    orelocs=reloc.next/8;

    /* --- Do external DLL table area --- */

    if (!inf->apptbl)
    {
      t.areaname=aof_string("DLL$$ExternalTable",&obj_strt);
      t.abase=obj_area.next;

      tmp=aof_int(0,&obj_area)-t.abase;
      aof_add(tmp,&reloc);
      aof_int(0x000A0000 | sym_dllName,&reloc);

      aof_int(inf->version,&obj_area);

      tmp=aof_int(0,&obj_area)-t.abase;
      aof_add(tmp,&reloc);
      aof_int(0x000A0000 | sym_dllEntries,&reloc);

      tmp=aof_int(0,&obj_area)-t.abase;
      aof_add(tmp,&reloc);
      aof_int(0x000A0000 | sym_dllStubs,&reloc);

      aof_align(obj_area);

      aof_int(t.areaname,&obj_head);
      aof_int(0x00002202,&obj_head);
      aof_int(obj_area.next-osize,&obj_head);
      aof_int(reloc.next/8-orelocs,&obj_head);
      aof_int(0,&obj_head);
      aof_addBlock(reloc.p,reloc.next,&obj_area);
      osize=obj_area.next;
      orelocs=reloc.next/8;
    }

    aof_fill(obj_strt.next,0,&obj_strt);
    aof_align(obj_strt);

    o=obj_symt.next/sizeof(aof_symbol);
    aof_fill(o,12,&obj_head);

    memcpy(h->table[0].chunkName,"OBJ_IDFN",8);
    memcpy(h->table[1].chunkName,"OBJ_HEAD",8);
    memcpy(h->table[2].chunkName,"OBJ_AREA",8);
    memcpy(h->table[3].chunkName,"OBJ_SYMT",8);
    memcpy(h->table[4].chunkName,"OBJ_STRT",8);

    o=sizeof(chunk_fixedHeader)+5*sizeof(chunk_tableEntry);

    h->table[0].offset=o;
    h->table[0].size=obj_idfn.next;
    o+=obj_idfn.next;

    h->table[1].offset=o;
    h->table[1].size=obj_head.next;
    o+=obj_head.next;

    h->table[2].offset=o;
    h->table[2].size=obj_area.next;
    o+=obj_area.next;

    h->table[3].offset=o;
    h->table[3].size=obj_symt.next;
    o+=obj_symt.next;

    h->table[4].offset=o;
    h->table[4].size=obj_strt.next;
    o+=obj_strt.next;

    fwrite(h,sizeof(chunk_fixedHeader)+5*sizeof(chunk_tableEntry),1,fp);
    fwrite(obj_idfn.p,obj_idfn.next,1,fp);
    fwrite(obj_head.p,obj_head.next,1,fp);
    fwrite(obj_area.p,obj_area.next,1,fp);
    fwrite(obj_symt.p,obj_symt.next,1,fp);
    fwrite(obj_strt.p,obj_strt.next,1,fp);
    fclose(fp);

    free(obj_idfn.p);
    free(obj_area.p);
    free(obj_strt.p);
    free(obj_head.p);
    free(obj_symt.p);
  }
}