/*
 *  PSX-Tools Bundle Pack
 *  Copyright (C) 2002-2005 Nicolas "Pixel" Noble
 *
 *  This program 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 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* $Id: binwriter-elf.cpp,v 1.1 2005-12-02 11:28:27 pixel Exp $ */

#include "binwriter-elf.h"
#include "binary-elf.h"

#ifdef WORDS_BIGENDIAN
static void sw32(u32 & x) {
    x = (x >> 24) | ((x >> 8) & 0x0000ff00) | ((x << 8) & 0x00ff0000) | (x << 24);
}
static void sw16(u16 & x) {
    x = (x >> 8) | ((x << 8);
}
#else
#define sw32(x) while(0)
#define sw16(x) while(0)
#endif

static u8 elf_ident[] = {
    0x7F, 0x45, 0x4C, 0x46, 0x01, 0x01, 0x01, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

// works only with align == 2^n
static Uint32 align_it(Uint32 address, int align) {
    if (address & (--align)) {
        address |= align;
        address++;
    }

    return address;
}

void BinWriter_elf::dump(Handle * elf) {
    struct elf_header_t weh;
    struct elf_pheader_t weph;
    int i;
    std::vector<struct SectionOut>::iterator iter;
    Uint32 offset = 0x1000;

    for (i = 0; i < 16; i++) {
	weh.e_ident.raw[i] = elf_ident[i];
    }
    weh.e_type = 2;
    weh.e_machine = 8;
    weh.e_version = 1;
    weh.e_phoff = sizeof(weh);
    weh.e_shoff = 0;
    weh.e_flags = 0;
    weh.e_ehsize = sizeof(weh);
    weh.e_phentsize = sizeof(weph);
    weh.e_phnum = sections.size();
    weh.e_shoff = 0;
    weh.e_shnum = 0;
    weh.e_shentsize = 0;
    weh.e_entry = epc;
    weh.e_shstrndx = 0;

    sw16(weh.e_type);
    sw16(weh.e_machine);
    sw32(weh.e_version);
    sw32(weh.e_entry);
    sw32(weh.e_phoff);
    sw32(weh.e_shoff);
    sw32(weh.e_flags);
    sw16(weh.e_ehsize);
    sw16(weh.e_phentsize);
    sw16(weh.e_phnum);
    sw16(weh.e_shentsize);
    sw16(weh.e_shnum);
    sw16(weh.e_shstrndx);
    
    elf->write(&weh, sizeof(weh));


    for (iter = sections.begin(); iter != sections.end(); iter++) {
        weph.type = PT_LOAD;
        weph.flags = PF_R | PF_W | PF_X;
        weph.offset = offset;
        weph.vaddr = iter->base;
        weph.paddr = iter->base;
        weph.filesz = iter->real_size;
        weph.memsz = iter->whole_size;
        weph.align = 0x1000;

        offset += iter->real_size;
        offset = align_it(offset, 0x1000);

        sw32(weph.type);
        sw32(weph.flags);
        sw32(weph.offset);
        sw32(weph.vaddr);
        sw32(weph.paddr);
        sw32(weph.filesz);
        sw32(weph.memsz);
        sw32(weph.align);

        elf->write(&weph, sizeof(weph));
    }

    offset = 0x1000;

    for (iter = sections.begin(); iter != sections.end(); iter++) {
        elf->seek(offset);
        if (iter->data) {
            elf->write(iter->data, iter->real_size);
            offset += iter->real_size;
        } else {
            offset++;
        }
        offset = align_it(offset, 0x1000);
    }
}

#if 0
static Uint32 elf_hash(const unsigned char * name) {
    Uint31 h = 0, g;

    while (*name) {
        h = (h << 4) + *name++;
        if ((g = h & 0xf0000000)
            h ^= g >> 24;
        h &= ~g;
    }
}
#endif