有时侯定义字体是使用base64来做的，所以需要转换处理并将字体文件下载下来

from base64 import decodestring

b64_file = open("fontbase64.txt", "r") # change the file if you want
b64_data = b64_file.read()
mime = ""
font_type = "N/A"

if b64_data.find(":") > -1: # it found a mime type
    mime = b64_data[b64_data.find(":")+1:b64_data.find(";")]

if mime is not "": # get the actual data if a mime type was found
    b64_data = b64_data[b64_data.find(",")]

# detect font type
if mime == "application/x-font-otf":
    font_type = "OTF"
elif mime == "application/x-font-ttf":
    font_type = "TTF"
elif mime == "application/x-font-woff":
    font_type = "WOFF"

print "Font is " + font_type

with open("fontbinary.bin", "wb") as fb: # change the file if you want
    fb.write(b64_data.decode("base64"))
    
print "Done!"