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canUnpack() and unpack() for PackMachBase, PackMachFat

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This commit is contained in:
John Reiser 2007-02-07 21:30:18 -08:00
parent 7a3c55af35
commit 6e68ab6d9e
1 changed files with 60 additions and 4 deletions
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64
src/p_mach.cpp
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@ -500,6 +500,8 @@ void PackMachBase<T>::pack1(OutputFile *const fo, Filter &/*ft*/) // generate e
template <class T>
void PackMachBase<T>::unpack(OutputFile *fo)
{
overlay_offset = sizeof(mhdro) + sizeof(segcmdo) +
my_thread_command_size + sizeof(linfo);
fi->seek(overlay_offset, SEEK_SET);
p_info hbuf;
fi->readx(&hbuf, sizeof(hbuf));
@ -513,6 +515,8 @@ void PackMachBase<T>::unpack(OutputFile *fo)
fi->readx(&bhdr, sizeof(bhdr));
ph.u_len = get_native32(&bhdr.sz_unc);
ph.c_len = get_native32(&bhdr.sz_cpr);
ph.method = bhdr.b_method;
ph.filter = bhdr.b_ftid;
ph.filter_cto = bhdr.b_cto8;
// Uncompress Macho headers
@ -550,7 +554,7 @@ void PackMachBase<T>::unpack(OutputFile *fo)
) {
if (Mach_segment_command::LC_SEGMENT==sc->cmd
&& 0!=sc->filesize ) {
unsigned filesize = get_be32(&sc->filesize);
unsigned filesize = sc->filesize;
unpackExtent(filesize, fo, total_in, total_out, c_adler, u_adler, false, sizeof(bhdr));
}
}
@ -683,9 +687,38 @@ void PackMachFat::pack(OutputFile *fo)
fo->set_extent(0, length);
}
void PackMachFat::unpack(OutputFile */*fo*/)
void PackMachFat::unpack(OutputFile *fo)
{
assert(false);
fo->seek(0, SEEK_SET);
fo->write(&fat_head, sizeof(fat_head.fat) +
fat_head.fat.nfat_arch * sizeof(fat_head.arch[0]));
unsigned length;
for (unsigned j=0; j < fat_head.fat.nfat_arch; ++j) {
unsigned base = fo->unset_extent(); // actual length
base += ~(~0u<<fat_head.arch[j].align) & -base; // align up
fo->seek(base, SEEK_SET);
fo->set_extent(base, ~0u);
ph.u_file_size = fat_head.arch[j].size;
fi->set_extent(fat_head.arch[j].offset, fat_head.arch[j].size);
switch (fat_head.arch[j].cputype) {
case PackMachFat::CPU_TYPE_I386: {
PackMachI386 packer(fi);
packer.unpack(fo);
} break;
case PackMachFat::CPU_TYPE_POWERPC: {
PackMachPPC32 packer(fi);
packer.unpack(fo);
} break;
} // switch cputype
fat_head.arch[j].offset = base;
length = fo->unset_extent();
fat_head.arch[j].size = length - base;
}
fo->seek(0, SEEK_SET);
fo->rewrite(&fat_head, sizeof(fat_head.fat) +
fat_head.fat.nfat_arch * sizeof(fat_head.arch[0]));
fo->set_extent(0, length);
}
bool PackMachFat::canPack()
@ -718,7 +751,30 @@ bool PackMachFat::canPack()
int PackMachFat::canUnpack()
{
return 0;
struct Mach_fat_arch *arch = &fat_head.arch[0];
fi->readx(&fat_head, sizeof(fat_head));
if (Mach_fat_header::FAT_MAGIC!=fat_head.fat.magic
|| N_FAT_ARCH < fat_head.fat.nfat_arch) {
return false;
}
for (unsigned j=0; j < fat_head.fat.nfat_arch; ++j) {
fi->set_extent(fat_head.arch[j].offset, fat_head.arch[j].size);
switch (arch[j].cputype) {
default: return false;
case PackMachFat::CPU_TYPE_I386: {
PackMachI386 packer(fi);
if (!packer.canUnpack())
return 0;
} break;
case PackMachFat::CPU_TYPE_POWERPC: {
PackMachPPC32 packer(fi);
if (!packer.canUnpack())
return 0;
} break;
} // switch cputype
}
return 1;
}
void PackMachFat::buildLoader(const Filter */*ft*/)