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Begin parsing AFP data into useful structures.

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This commit is contained in:
Jennifer Taylor 2021-04-12 03:09:57 +00:00
parent 9925b2f6b0
commit 9f6b9eb7d6
3 changed files with 102 additions and 33 deletions
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3
bemani/format/afp/__init__.py
View File

@ -1,5 +1,5 @@
from .geo import Shape, DrawParams
from .swf import SWF
from .swf import SWF, NamedTagReference
from .container import TXP2File, PMAN, Texture, TextureRegion, Unknown1, Unknown2
from .types import Matrix, Color, Point, Rectangle, AP2Tag, AP2Action, AP2Object, AP2Pointer, AP2Property
@ -8,6 +8,7 @@ __all__ = [
'Shape',
'DrawParams',
'SWF',
'NamedTagReference',
'TXP2File',
'PMAN',
'Texture',

120
bemani/format/afp/swf.py
View File

@ -2,13 +2,28 @@ from hashlib import md5
import os
import struct
import sys
from typing import Any, Dict, List, Tuple
from typing import Any, Dict, List, Optional, Tuple
from .types import Matrix, Color, Point, Rectangle
from .types import AP2Action, AP2Tag, AP2Property
from .util import TrackedCoverage, VerboseOutput, _hex
class NamedTagReference:
def __init__(self, swf_name: str, tag_name: str) -> None:
self.swf = swf_name
self.tag = tag_name
def as_dict(self) -> Dict[str, Any]:
return {
'swf': self.swf,
'tag': self.tag,
}
def __repr__(self) -> str:
return f"{self.swf}.{self.tag}"
class SWF(TrackedCoverage, VerboseOutput):
def __init__(
self,
@ -19,22 +34,47 @@ class SWF(TrackedCoverage, VerboseOutput):
# First, init the coverage engine.
super().__init__()
# Now, initialize parsed data.
self.name = name
self.exported_name = ""
self.data = data
self.descramble_info = descramble_info
# Name of this SWF, according to the container it was extracted from.
self.name: str = name
# Initialize string table. This is used for faster lookup of strings
# as well as tracking which strings in the table have been parsed correctly.
self.strings: Dict[int, Tuple[str, bool]] = {}
# Name of this SWF, as referenced by other SWFs that require imports from it.
self.exported_name: str = ""
# Full, unparsed data for this SWF, as well as the descrambling headers.
self.data: bytes = data
self.descramble_info: bytes = descramble_info
# Data version of this SWF.
self.data_version: int = 0
# Container version of this SWF.
self.container_version: int = 0
# The requested frames per second this SWF plays at.
self.fps: float = 0.0
# Background color of this SWF movie.
self.color: Optional[Color] = None
# Location of this SWF in screen space.
self.location: Rectangle = Rectangle.Empty()
# Exported tags, indexed by their name and pointing to the Tag ID that name identifies.
self.exported_tags: Dict[str, int] = {}
# Imported tags, indexed by their Tag ID, and pointing at the SWF asset and exported tag name.
self.imported_tags: Dict[int, NamedTagReference] = {}
# SWF string table. This is used for faster lookup of strings as well as
# tracking which strings in the table have been parsed correctly.
self.__strings: Dict[int, Tuple[str, bool]] = {}
def print_coverage(self) -> None:
# First print uncovered bytes
super().print_coverage()
# Now, print uncovered strings
for offset, (string, covered) in self.strings.items():
for offset, (string, covered) in self.__strings.items():
if covered:
continue
@ -752,7 +792,7 @@ class SWF(TrackedCoverage, VerboseOutput):
start_tag_id = frame_info & 0xFFFFF
num_tags_to_play = (frame_info >> 20) & 0xFFF
self.vprint(f"{prefix} Frame Start Tag: {hex(start_tag_id)}, Count: {num_tags_to_play}")
self.vprint(f"{prefix} Frame Start Tag: {start_tag_id}, Count: {num_tags_to_play}")
frame_offset += 4
# Now, parse unknown tags? I have no idea what these are, but they're referencing strings that
@ -814,7 +854,7 @@ class SWF(TrackedCoverage, VerboseOutput):
if byte == 0:
if curstring:
# We found a string!
self.strings[curloc - stringtable_offset] = (bytes(curstring).decode('utf8'), False)
self.__strings[curloc - stringtable_offset] = (bytes(curstring).decode('utf8'), False)
curloc = stringtable_offset + i + 1
curstring = []
curloc = stringtable_offset + i + 1
@ -824,7 +864,7 @@ class SWF(TrackedCoverage, VerboseOutput):
if curstring:
raise Exception("Logic error!")
if 0 in self.strings:
if 0 in self.__strings:
raise Exception("Should not include null string!")
return bytes(data)
@ -833,8 +873,8 @@ class SWF(TrackedCoverage, VerboseOutput):
if offset == 0:
return ""
self.strings[offset] = (self.strings[offset][0], True)
return self.strings[offset][0]
self.__strings[offset] = (self.__strings[offset][0], True)
return self.__strings[offset][0]
def parse(self, verbose: bool = False) -> None:
with self.covered(len(self.data), verbose):
@ -847,8 +887,6 @@ class SWF(TrackedCoverage, VerboseOutput):
# Start with the basic file header.
magic, length, version, nameoffset, flags, left, right, top, bottom = struct.unpack("<4sIHHIHHHH", data[0:24])
width = right - left
height = bottom - top
self.add_coverage(0, 24)
ap2_data_version = magic[0] & 0xFF
@ -862,24 +900,40 @@ class SWF(TrackedCoverage, VerboseOutput):
if version != 0x200:
raise Exception(f"Unsupported AP2 version {version}!")
# The container version is analogous to the SWF file version. I'm pretty sure it
# dictates certain things like what properties are available. These appear strictly
# additive so we don't concern ourselves with this.
self.container_version = ap2_data_version
# The data version is basically used for how to parse tags. There was an older data
# version 0x100 that used more SWF-like bit-packed tags and while lots of code exists
# to parse this, the AP2 libraries will reject SWF data with this version.
self.data_version = version
# As far as I can tell, most things only care about the width and height of this
# movie, and I think the Shapes are rendered based on the width/height. However, it
# can have a non-zero x/y offset and I think this is used when rendering multiple
# movie clips?
self.location = Rectangle(left=left, right=right, top=top, bottom=bottom)
if flags & 0x1:
# This appears to be the animation background color.
rgba = struct.unpack("<I", data[28:32])[0]
swf_color = Color(
self.color = Color(
r=(rgba & 0xFF) / 255.0,
g=((rgba >> 8) & 0xFF) / 255.0,
b=((rgba >> 16) & 0xFF) / 255.0,
a=((rgba >> 24) & 0xFF) / 255.0,
)
else:
swf_color = None
self.color = None
self.add_coverage(28, 4)
if flags & 0x2:
# FPS can be either an integer or a float.
fps = struct.unpack("<i", data[24:28])[0] * 0.0009765625
self.fps = struct.unpack("<i", data[24:28])[0] * 0.0009765625
else:
fps = struct.unpack("<f", data[24:28])[0]
self.fps = struct.unpack("<f", data[24:28])[0]
self.add_coverage(24, 4)
if flags & 0x4:
@ -900,14 +954,13 @@ class SWF(TrackedCoverage, VerboseOutput):
# Get exported SWF name.
self.exported_name = self.__get_string(nameoffset)
self.add_coverage(nameoffset + stringtable_offset, len(self.exported_name) + 1, unique=False)
self.vprint(f"{os.linesep}AFP name: {self.name}")
self.vprint(f"Container Version: {hex(ap2_data_version)}")
self.vprint(f"Version: {hex(version)}")
self.vprint(f"Container Version: {hex(self.container_version)}")
self.vprint(f"Version: {hex(self.data_version)}")
self.vprint(f"Exported Name: {self.exported_name}")
self.vprint(f"SWF Flags: {hex(flags)}")
if flags & 0x1:
self.vprint(f" 0x1: Movie background color: {swf_color}")
self.vprint(f" 0x1: Movie background color: {self.color}")
else:
self.vprint(" 0x2: No movie background color")
if flags & 0x2:
@ -918,8 +971,8 @@ class SWF(TrackedCoverage, VerboseOutput):
self.vprint(" 0x4: Imported tag initializer section present")
else:
self.vprint(" 0x4: Imported tag initializer section not present")
self.vprint(f"Dimensions: {width}x{height}")
self.vprint(f"Requested FPS: {fps}")
self.vprint(f"Dimensions: {self.location.width}x{self.location.height}")
self.vprint(f"Requested FPS: {self.fps}")
# Exported assets
num_exported_assets = struct.unpack("<H", data[32:34])[0]
@ -928,15 +981,17 @@ class SWF(TrackedCoverage, VerboseOutput):
self.add_coverage(40, 4)
# Parse exported asset tag names and their tag IDs.
self.exported_tags = {}
self.vprint(f"Number of Exported Tags: {num_exported_assets}")
for assetno in range(num_exported_assets):
asset_data_offset, asset_string_offset = struct.unpack("<HH", data[asset_offset:(asset_offset + 4)])
asset_tag_id, asset_string_offset = struct.unpack("<HH", data[asset_offset:(asset_offset + 4)])
self.add_coverage(asset_offset, 4)
asset_offset += 4
asset_name = self.__get_string(asset_string_offset)
self.add_coverage(asset_string_offset + stringtable_offset, len(asset_name) + 1, unique=False)
self.vprint(f" {assetno}: Tag Name: {asset_name} Tag ID: {asset_data_offset}")
self.exported_tags[asset_name] = asset_tag_id
self.vprint(f" {assetno}: Tag Name: {asset_name}, Tag ID: {asset_tag_id}")
# Tag sections
tags_offset = struct.unpack("<I", data[36:40])[0]
@ -951,13 +1006,13 @@ class SWF(TrackedCoverage, VerboseOutput):
self.add_coverage(44, 4)
self.vprint(f"Number of Imported Tags: {imported_tags_count}")
self.imported_tags = {}
for i in range(imported_tags_count):
# First grab the SWF this is importing from, and the number of assets being imported.
swf_name_offset, count = struct.unpack("<HH", data[imported_tags_offset:(imported_tags_offset + 4)])
self.add_coverage(imported_tags_offset, 4)
swf_name = self.__get_string(swf_name_offset)
self.add_coverage(swf_name_offset + stringtable_offset, len(swf_name) + 1, unique=False)
self.vprint(f" Source SWF: {swf_name}")
# Now, grab the actual asset names being imported.
@ -966,7 +1021,8 @@ class SWF(TrackedCoverage, VerboseOutput):
self.add_coverage(imported_tags_data_offset, 4)
asset_name = self.__get_string(asset_name_offset)
self.add_coverage(asset_name_offset + stringtable_offset, len(asset_name) + 1, unique=False)
self.imported_tags[asset_id_no] = NamedTagReference(swf_name=swf_name, tag_name=asset_name)
self.vprint(f" Tag ID: {asset_id_no}, Requested Asset: {asset_name}")
imported_tags_data_offset += 4

12
bemani/format/afp/types/generic.py
View File

@ -67,5 +67,17 @@ class Rectangle:
'right': self.right,
}
@property
def width(self) -> float:
return self.right - self.left
@property
def height(self) -> float:
return self.bottom - self.top
def __repr__(self) -> str:
return f"left: {round(self.left, 5)}, top: {round(self.top, 5)}, bottom: {round(self.bottom, 5)}, right: {round(self.right, 5)}"
@staticmethod
def Empty() -> "Rectangle":
return Rectangle(left=0.0, right=0.0, top=0.0, bottom=0.0)