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PhoenixAnalyzer: Load language tables separately on 4.0R6

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RichardG867
2022-08-06 18:50:34 -03:00
parent e505cdbff2
commit 98e5ffca86
1 changed files with 26 additions and 18 deletions
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44
biostools/analyzers.py
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@@ -2221,22 +2221,32 @@ class PhoenixAnalyzer(Analyzer):
# SecureCore may have 4 bytes before the STRPACK header.
offset = data.find(b'STRPACK-BIOS')
if offset > -1:
strings_files.append(data[offset:])
self.debug_print('Loaded strings file:', file_in_dir)
else:
# Try to ascertain the string table location from the language code
# and next 2 bytes if no STRPACK header is present. (HP B013300I)
offset = data.find(b'us\x14\x00')
if offset > -1:
header = data[offset - 0x20:offset]
if len(header) < 0x20:
header = (b'\x00' * (0x20 - len(header))) + header
strings_files.append(header + data[offset:])
else:
self.debug_print('Bad strings file:', file_in_dir)
# Load each string table.
offset += 0x1c
languages = []
while True:
# Parse string table header.
lang_header = data[offset:offset + 6]
if len(lang_header) != 6: # end reached
break
lang_size, _, lang_code = struct.unpack('<HH2s', lang_header)
if lang_size == 0:
break
# Sort strings files, prioritizing the "us" (English) language.
strings_files.sort(key=lambda x: x[0x20:0x22] == b'us' and b'\x00\x00' or x[0x20:0x22])
# Add string table data, prioritizing the English language.
if lang_code == b'us':
strings_files.insert(0, data[offset:offset + lang_size])
else:
strings_files.append(data[offset:offset + lang_size])
languages.append(lang_code)
# Move on to the next table.
offset += lang_size
strings_files.append(data[offset:])
self.debug_print('Loaded strings file:', file_in_dir, '=>', languages)
else:
self.debug_print('Bad strings file:', file_in_dir)
# Read sign-on string pointer.
signon_segment = code_segment
@@ -2246,7 +2256,6 @@ class PhoenixAnalyzer(Analyzer):
signon = None
if bios_maj >= 6 or (bios_maj == 4 and bios_min >= 6):
# 4.0R6+: string table pointer is relative to string table file minus header.
signon_offset += 0x1c
self.debug_print('BCPOST sign-on points to string table file offset', hex(signon_offset))
# Make sure we have a strings file first.
@@ -2254,12 +2263,11 @@ class PhoenixAnalyzer(Analyzer):
string_table_offset = strings_files[0][signon_offset:signon_offset + 2]
if len(string_table_offset) == 2:
signon_offset, = struct.unpack('<H', string_table_offset)
signon_offset += 0x1c
self.debug_print('BCPOST sign-on string table entry points to file offset', hex(signon_offset))
# Phoenix allowed for some line drawing that is not quite CP437.
# The actual characters used haven't been confirmed in hardware.
signon = strings_files[0][signon_offset:signon_offset + 256]
signon = strings_files[0][signon_offset:]
for args in ((b'\x91', b'\xDA'), (b'\x92', b'\xC4'), (b'\x87', b'\xBF'), (b'\x86', b'\xB3'), (b'\x90', b'\xC0'), (b'\x88', b'\xD9')):
signon = signon.replace(*args)
else: