public virtual void ParseIndex(Action<Hunk> h)
{
var hunk = new IndexHunk();
h(hunk);
var index_size = this.read_long();
var total_size = index_size * 4;
// First read string table
var strtab_size = f.ReadBeInt16();
var strtab = f.ReadBytes(strtab_size);
total_size -= strtab_size + 2;
// Read units
var units = new List<Unit>();
hunk.units = units;
var unit_no = 0;
while (total_size > 2)
{
// Read name of unit
var name_offset = f.ReadBeInt16();
total_size -= 2;
if (name_offset == 0)
break;
var unit = new Unit { unit_no = unit_no };
units.Add(unit);
++unit_no;
// Generate unit name
unit.name = this.get_index_name(strtab, name_offset);
// hunks in unit
var hunk_begin = f.ReadBeInt16();
var num_hunks = f.ReadBeInt16();
total_size -= 4;
unit.hunk_begin_offset = hunk_begin;
// For all hunks in unit
var ihunks = new List<IHunk>();
unit.hunk_infos = ihunks;
for (var a = 0; a < num_hunks; ++a)
{
var ihunk = new IHunk();
ihunks.Add(ihunk);
// get hunk info
name_offset = f.ReadBeInt16();
var hunk_size = f.ReadBeInt16();
var hunk_type = f.ReadBeInt16();
total_size -= 6;
ihunk.name = this.get_index_name(strtab, name_offset);
ihunk.size = hunk_size;
ihunk.type = hunk_type & 16383;
ihunk.memf = this.SetMemoryFlags(hunk_type & 49152, 14);
// get references
var num_refs = f.ReadBeInt16();
total_size -= 2;
if (num_refs > 0)
{
var refs = new List<Reference>();
ihunk.refs = refs;
for (var b = 0; b < num_refs; ++b)
{
var @ref = new Reference();
name_offset = f.ReadBeInt16();
total_size -= 2;
var name = this.get_index_name(strtab, name_offset);
if (name == "")
{
// 16 bit refs point to the previous zero byte before the string entry...
name = this.get_index_name(strtab, name_offset + 1);
@ref.bits = 16;
}
else
{
@ref.bits = 32;
}
@ref.name = name;
refs.Add(@ref);
// get definitions
}
}
var num_defs = f.ReadBeInt16();
total_size -= 2;
if (num_defs > 0)
{
var defs = new List<Definition>();
ihunk.defs = defs;
for (var b = 0; b < num_defs; ++b)
{
name_offset = f.ReadBeInt16();
var def_value = f.ReadBeInt16();
var def_type_flags = f.ReadBeInt16();
var def_type = def_type_flags & 16383;
var def_flags = def_type_flags & 49152;
total_size -= 6;
var name = this.get_index_name(strtab, name_offset);
var d = new Definition
{
name = name,
value = def_value,
type = def_type
};
d.memf = this.SetMemoryFlags(def_flags, 14);
defs.Add(d);
}
}
}
}
// Align hunk to long-word.
if (total_size == 2)
{
f.ReadBeInt16();
}
else if (total_size != 0)
throw new BadImageFormatException(string.Format("{0} has invalid padding.", hunk.HunkType));
}
//$TODO: move this to HunkFile
public bool BuildUnit()
{
var force_unit = true;
var in_hunk = false;
string name = null;
List<Hunk> segment = null;
Unit unit = null;
this.hunkFile.units = new List<Unit>();
var unit_no = 0;
int hunk_no = 0;
foreach (var e in this.hunkFile.hunks)
{
var hunk_type = e.HunkType;
// optional unit as first entry
if (hunk_type == HunkType.HUNK_UNIT)
{
unit = new Unit
{
name = e.Name,
unit_no = unit_no,
segments = new List<List<Hunk>>(),
unit = e,
};
++unit_no;
this.hunkFile.units.Add(unit);
force_unit = false;
hunk_no = 0;
}
else if (force_unit)
throw new BadImageFormatException(string.Format("Expected name hunk in unit: {0} {1}/{1:X}.", e.HunkType, (int) hunk_type));
else if (!in_hunk)
{
// begin a named hunk
if (hunk_type == HunkType.HUNK_NAME)
{
name = e.Name;
// main hunk block
}
else if (unit_valid_main_hunks.Contains(hunk_type))
{
segment = new List<Hunk> {
e
};
unit.segments.Add(segment);
// give main block the NAME
if (name != null)
{
e.Name = name;
name = null;
}
e.hunk_no = hunk_no;
hunk_no += 1;
in_hunk = true;
// broken hunk: ignore multi ENDs
}
else if (hunk_type == HunkType.HUNK_END)
{
}
else
throw new BadImageFormatException(string.Format("Expected main hunk in unit: {0} {1}/{1:X}.", e.HunkType, hunk_type));
}
else
{
// a hunk is finished
if (hunk_type == HunkType.HUNK_END)
{
in_hunk = false;
// contents of hunk
}
else if (HunkLoader.unit_valid_extra_hunks.Contains(hunk_type))
{
segment.Add(e);
// unecpected hunk?!
}
else
throw new BadImageFormatException(string.Format("Unexpected hunk in unit: {0} {1}/{1:X}", e.HunkType, hunk_type));
}
}
return true;
}
