本文整理汇总了Python中bitstring.ConstBitStream.peeklist方法的典型用法代码示例。如果您正苦于以下问题：Python ConstBitStream.peeklist方法的具体用法？Python ConstBitStream.peeklist怎么用？Python ConstBitStream.peeklist使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类bitstring.ConstBitStream的用法示例。
在下文中一共展示了ConstBitStream.peeklist方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: extractXMP
# 需要导入模块: from bitstring import ConstBitStream [as 别名]
# 或者: from bitstring.ConstBitStream import peeklist [as 别名]
def extractXMP(self, filename):
xmpStr = ""
# Can initialise from files, bytes, etc.
try:
s = ConstBitStream(filename = filename)
# Search for ":xmpmeta" string in file
keepSearching = True
while keepSearching:
keepSearching = False
colonXmpmetaInHexStr = '0x3a786d706d657461'
foundSt = s.find(colonXmpmetaInHexStr, bytealigned=True)
if foundSt:
byteStart = (int(foundSt[0])//8)
# The start of data can be "<xmp:xmpmeta" or "<x:xmpmeta"
s.bytepos = byteStart - 4
prevals = s.peeklist("4*uint:8")
prestr = ''.join(chr(i) for i in prevals)
# print (prestr, prestr[2:])
if prestr == "<xmp":
byteStart = byteStart - 4
prefix = "0x3c2f786d70" # "<\xmp" in hex
elif prestr[2:] == "<x":
byteStart = byteStart - 2
prefix = "0x3c2f78" # "<\x" in hex
else:
# print ("Cont")
keepSearching = True
continue
# print("Found start code at byte offset %d." % byteStart)
foundEnd = s.find(prefix + colonXmpmetaInHexStr, bytealigned=True)
if foundEnd:
byteEnd = (int(foundEnd[0])//8)
s.bytepos = byteStart
# print("Found end code at byte offset %d." % byteEnd)
xmpBytes = s.readlist(str(byteEnd-byteStart+len(prefix)//2+9) +"*uint:8")
xmpStr = ''.join(chr(i) for i in xmpBytes)
#if "Rating" in xmpStr:
# print (xmpStr)
except:
xmpStr = ""
return xmpStr