filters for unix(linux)

Modified Files:
	filteri.cpp filter/ctojr.h linker.cpp linker.h mem.cpp mem.h
	p_lx_elf.cpp p_lx_elf.h
	p_lx_exc.cpp p_lx_exc.h
	p_lx_sh.cpp  p_lx_sh.h
	p_unix.cpp packer.cpp packer.h packhead.cpp
	stub/Makefile    stub/macros.ash
	stub/l_lx_elf.c  stub/l_lx_elf86.asm  stub/l_lx_elf86.lds
	stub/l_lx_exec.c stub/l_lx_exec86.asm stub/l_lx_exec86.lds
	                 stub/l_lx_sh86.asm   stub/l_lx_sh86.lds
Added Files:
	filter/ctok.h
	stub/fold_elf86.asm stub/fold_exec86.asm stub/fold_sh86.asm

committer: jreiser <jreiser> 979796725 +0000

src/mem.cpp

@@ -47,6 +47,14 @@ MemBuffer::~MemBuffer()
     this->free();
 }
 
+MemBufferIO::MemBufferIO(unsigned size) :
+    MemBuffer(size)
+{
+}
+
+MemBufferIO::~MemBufferIO()
+{
+}
 
 void MemBuffer::free()
 {
@@ -67,6 +75,39 @@ unsigned MemBuffer::getSize() const
 }
 
 
+unsigned MemBufferIO::seek(unsigned offset, int whence)
+{
+    switch (whence) {
+    default: {
+        assert(false);
+    } break;
+    case SEEK_SET: {
+        assert(offset<=alloc_size);
+        ptr = offset + alloc_ptr;
+    } break;
+    case SEEK_CUR: {
+        assert((offset + (ptr - alloc_ptr))<=alloc_size);
+        ptr += offset;
+    } break;
+    case SEEK_END: {
+        assert((offset + alloc_size)<=alloc_size);
+        ptr = offset + alloc_size + alloc_ptr;
+    } break;
+    }
+    return ptr - alloc_ptr;
+}
+
+unsigned MemBufferIO::write(void const *data, unsigned size)
+{
+    unsigned const avail = getSize();
+    unsigned const len = UPX_MIN(size, avail);
+    if (data!=ptr) {
+        memmove(ptr, data, len);
+    }
+    ptr += len;
+    return len;
+}
+
 void MemBuffer::alloc(unsigned size, unsigned base_offset)
 {
 #if 0