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[swfinterp] Use helper function struct_unpack for old Python 2.x releases (#3270)

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Philipp Hagemeister 2014-07-20 23:20:15 +02:00
parent f3308e138d
commit c13bf7c836
1 changed files with 7 additions and 7 deletions
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14
youtube_dl/swfinterp.py
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@ -2,12 +2,12 @@ from __future__ import unicode_literals
import collections import collections
import io import io
import struct
import zlib import zlib
from .utils import ( from .utils import (
compat_str, compat_str,
ExtractorError, ExtractorError,
struct_unpack,
) )
@ -23,17 +23,17 @@ def _extract_tags(file_contents):
file_contents[:1]) file_contents[:1])
# Determine number of bits in framesize rectangle # Determine number of bits in framesize rectangle
framesize_nbits = struct.unpack('!B', content[:1])[0] >> 3 framesize_nbits = struct_unpack('!B', content[:1])[0] >> 3
framesize_len = (5 + 4 * framesize_nbits + 7) // 8 framesize_len = (5 + 4 * framesize_nbits + 7) // 8
pos = framesize_len + 2 + 2 pos = framesize_len + 2 + 2
while pos < len(content): while pos < len(content):
header16 = struct.unpack('<H', content[pos:pos + 2])[0] header16 = struct_unpack('<H', content[pos:pos + 2])[0]
pos += 2 pos += 2
tag_code = header16 >> 6 tag_code = header16 >> 6
tag_len = header16 & 0x3f tag_len = header16 & 0x3f
if tag_len == 0x3f: if tag_len == 0x3f:
tag_len = struct.unpack('<I', content[pos:pos + 4])[0] tag_len = struct_unpack('<I', content[pos:pos + 4])[0]
pos += 4 pos += 4
assert pos + tag_len <= len(content), \ assert pos + tag_len <= len(content), \
('Tag %d ends at %d+%d - that\'s longer than the file (%d)' ('Tag %d ends at %d+%d - that\'s longer than the file (%d)'
@ -99,7 +99,7 @@ def _read_int(reader):
for _ in range(5): for _ in range(5):
buf = reader.read(1) buf = reader.read(1)
assert len(buf) == 1 assert len(buf) == 1
b = struct.unpack('<B', buf)[0] b = struct_unpack('<B', buf)[0]
res = res | ((b & 0x7f) << shift) res = res | ((b & 0x7f) << shift)
if b & 0x80 == 0: if b & 0x80 == 0:
break break
@ -125,7 +125,7 @@ def _s24(reader):
bs = reader.read(3) bs = reader.read(3)
assert len(bs) == 3 assert len(bs) == 3
last_byte = b'\xff' if (ord(bs[2:3]) >= 0x80) else b'\x00' last_byte = b'\xff' if (ord(bs[2:3]) >= 0x80) else b'\x00'
return struct.unpack('<i', bs + last_byte)[0] return struct_unpack('<i', bs + last_byte)[0]
def _read_string(reader): def _read_string(reader):
@ -144,7 +144,7 @@ def _read_bytes(count, reader):
def _read_byte(reader): def _read_byte(reader):
resb = _read_bytes(1, reader=reader) resb = _read_bytes(1, reader=reader)
res = struct.unpack('<B', resb)[0] res = struct_unpack('<B', resb)[0]
return res return res