def parse_swf_head(self):
"swf_header"
self.magic = self.swf_read(3)
self.version = ord(self.swf_read(1))
self.file_length = le4byte(self.swf_read(4))
"swf_header_movie"
# twips 関連のヘッダは、今は飛ばす
rectbits = ord(self.swf_read(1)) >> 3
total_bytes = int(ceil((5 + rectbits * 4) / 8.0))
self.swf_read(total_bytes - 1)
# frame 関連
self.frame_rate_decimal = ord(self.swf_read(1))
self.frame_rate_integer = ord(self.swf_read(1))
self.frame_count = le2byte(self.swf_read(2))
# ヘッダー, twips, frame データを取っておく
self.swf_head = self.swf[:self.swf_pos]
if DEBUG:
print "magic: %s\nver: %d\nlen: %d\n" \
"frame_rate: %d.%d\ncount: %d\n" % ( \
self.magic,
self.version,
self.file_length,
self.frame_rate_integer,
self.frame_rate_decimal,
self.frame_count)
def replace_lossless(self, block, image_data):
"""
DefineBitsLossless, DefineBitsLossless2 を置き換える関数
画像を置き換える際に行うこと
1. lossless データの置き換え
2. ヘッダーの length の置き換え
3. tag block での length の置き換え
4. width, height, format データの置き換え
"""
tag_raw = block['value'][:2]
old_length = block['block_len'] # block['value'][2:6] と同じはず
image_id = le2byte(block['value'][6:8])
# format = ord(block['value'][8])
# 1.
g = Image2lossless(image_data, block['tag'])
fv_read = g.convert()
new_length = len(fv_read) + 7
# 2.
self.file_length += (new_length - old_length)
# 3.
block['block_len'] = new_length
# 4.
block['value'] = \
tag_raw + \
_h32(new_length) + \
_h16(image_id) + \
g.get_lossless_format() + \
_h16(g.width()) + \
_h16(g.height()) + \
fv_read
def replace_images(self, images):
for block in self.swf_blocks:
if block['tag'] in (20, 21, 36):
image_id = le2byte(block['value'][6:8])
if image_id in images:
if block['tag'] in (20, 36): # DefineBitsLossless, DefineBitsLossless2
self.replace_lossless(block, images[image_id])
elif block['tag'] == 21: # DefineBitsJPEG2
self.replace_jpeg(block, images[image_id])
def parse_swfblock(self):
swf_block_start = self.swf_pos
swf_tag = le2byte(self.swf_read(2))
block_len = swf_tag & 0x3f
if block_len == 0x3f:
block_len = le4byte(self.swf_read(4))
swf_tag = swf_tag >> 6
if swf_tag == 0:
return None
try:
swf_tag_name = swf_tag_name_entry[swf_tag]
except KeyError:
swf_tag_name = "Unknown"
ret = {}
ret['block_start'] = swf_block_start
ret['tag'] = swf_tag
ret['block_len'] = block_len
ret['tag_name'] = swf_tag_name
self.swf_pos += block_len
ret['value'] = self.swf[swf_block_start:self.swf_pos]
return ret
def parse_swfblock(self):
block_start = self.offset
tag = le2byte(self.read(2))
block_len = tag & 0x3f
if block_len == 0x3f:
block_len = le4byte(self.read(4))
tag = tag >> 6
content_offset = self.offset - block_start
self.offset += block_len
args = [
tag,
block_len,
content_offset,
self.value[block_start:self.offset],
self.base_block,
self.swf]
if tag in SWF_TAG:
return SWF_TAG[tag](*args)
else:
return SwfBlock(*args)
