// Resolve hunks referenced in the index";
// From the hunk list build a set of segments that form the actual binary.
// Return a summary of the created segment structure.
public virtual HunkFile Parse()
{
this.hunks = new List <Hunk>();
bool isFirstHunk = true;
bool sawEndHunk = false;
bool was_potential_v37_hunk = false;
bool sawOverlay = false;
var lib_size = 0;
uint last_file_offset = 0;
while (true)
{
var hunkFileOffset = f.Offset;
// read hunk type
var rawHunkType = this.read_long();
if (rawHunkType == -1 || rawHunkType == -2)
{
// tolerate extra byte at end
if (isFirstHunk)
{
throw new BadImageFormatException("Invalid hunk file. The file is empty.");
}
break;
}
var hunkType = (HunkType)(rawHunkType & Hunk.HUNK_TYPE_MASK);
var hunkFlags = rawHunkType & Hunk.HUNK_FLAGS_MASK;
// Validate that hunk type is known.
if (!knownHunkTypes.ContainsKey(hunkType))
{
// no hunk file?
if (isFirstHunk)
{
throw new BadImageFormatException(String.Format("Unknown hunk type: {0}.", hunkType));
}
if (sawEndHunk)
{
// garbage after an end tag is ignored
return(this.hunk_file);
}
if (was_potential_v37_hunk)
{
// auto fix v37 -> reread whole file
f.Offset = 0;
v37_compat = true;
return(this.Parse());
}
if (sawOverlay)
{
// seems to be a custom overlay -> read to end of file
var ov_custom_data = f.ReadToEnd();
((OverlayHunk)this.hunk_file.hunks[hunks.Count - 1]).custom_data = ov_custom_data;
return(this.hunk_file);
}
else
{
throw new BadImageFormatException(
string.Format("Invalid hunk type {0}/{0:X} found at @{1:X8}.", hunkType, (int)hunkType, f.Offset));
}
}
// check for valid first hunk type
if (isFirstHunk && !this.IsValidFirstHunkType(hunkType))
{
throw new BadImageFormatException(String.Format("No hunk file. The first hunk type was {1}.", hunkType));
}
isFirstHunk = false;
sawEndHunk = false;
was_potential_v37_hunk = false;
sawOverlay = false;
Action <Hunk> hunk = h =>
{
h.HunkType = hunkType;
h.FileOffset = (uint)hunkFileOffset;
hunk_file.hunks.Add(h);
h.memf = this.SetMemoryFlags(hunkFlags, 30);
// Account for lib
var last_hunk_size = (int)(hunkFileOffset - last_file_offset);
if (lib_size > 0)
{
lib_size -= last_hunk_size;
}
if (lib_size > 0)
{
h.in_lib = true;
}
// V37 fix?
if (hunkType == HunkType.HUNK_DREL32)
{
// try to fix automatically...
if (v37_compat == null)
{
was_potential_v37_hunk = true;
// fix was forced
}
else if (v37_compat.HasValue && v37_compat.Value)
{
hunkType = HunkType.HUNK_RELOC32SHORT;
h.fixes = "v37";
}
}
};
Debug.WriteLineIf(trace.TraceVerbose, string.Format("Loading hunk type: {0}", hunkType));
switch (hunkType)
{
case HunkType.HUNK_HEADER:
this.ParseHeader(hunk);
break;
case HunkType.HUNK_CODE:
case HunkType.HUNK_DATA:
case HunkType.HUNK_PPC_CODE:
this.ParseText(hunk);
break;
case HunkType.HUNK_BSS:
this.ParseBss(hunk);
break;
case HunkType.HUNK_RELRELOC32:
case HunkType.HUNK_ABSRELOC16:
case HunkType.HUNK_RELRELOC8:
case HunkType.HUNK_RELRELOC16:
case HunkType.HUNK_ABSRELOC32:
case HunkType.HUNK_DREL32:
case HunkType.HUNK_DREL16:
case HunkType.HUNK_DREL8:
case HunkType.HUNK_RELRELOC26:
try
{
this.ParseReloc(hunk);
}
catch (BadImageFormatException)
{
// auto fix v37 bug?
if (hunkType != HunkType.HUNK_DREL32 || v37_compat != null)
{
throw;
}
f.Offset = 0;
v37_compat = true;
return(Parse());
}
break;
case HunkType.HUNK_RELOC32SHORT:
this.ParseRelocShort(hunk);
break;
case HunkType.HUNK_SYMBOL:
this.ParseSymbol(hunk);
break;
case HunkType.HUNK_DEBUG:
this.ParseDebug(hunk);
break;
case HunkType.HUNK_END:
hunk(new Hunk());
sawEndHunk = true;
break;
case HunkType.HUNK_OVERLAY:
this.ParseOverlay(hunk);
sawOverlay = true;
break;
case HunkType.HUNK_BREAK:
break;
case HunkType.HUNK_LIB:
lib_size = this.ParseLib(hunk);
lib_size += 8;
break;
case HunkType.HUNK_INDEX:
this.ParseIndex(hunk);
break;
case HunkType.HUNK_EXT:
this.ParseExt(hunk);
break;
case HunkType.HUNK_UNIT:
case HunkType.HUNK_NAME:
this.parse_unit_or_name(hunk);
break;
default:
throw new BadImageFormatException(string.Format("Unsupported hunk {0}.", (int)hunkType));
}
last_file_offset = (uint)hunkFileOffset;
}
return(hunk_file);
}
