使用zlib解壓縮Python請求響應

Question

我試圖使用Python請求和zlib解壓縮來自Web請求的響應，但我無法正確解壓縮響應內容。這裏是我的代碼：

import requests 
import zlib 

URL = "http://" #omitted real url 
r = requests.get(URL) 
print r.content 
data = zlib.decompress(r.content, lib.MAX_WBITS) 
print data 

但是，當我改變wbits參數時，我總是收到各種錯誤。

zlib.error: Error -3 while decompressing data: incorrect header check 
zlib.error: Error -3 while decompressing data: invalid stored block lengths 

我試過放氣，ZLIP和gzip的WBITS參數，這裏要注意zlib.error: Error -3 while decompressing: incorrect header check

但依然無法通過這些錯誤。我想這在Python，我得到了這片與Objective-C的做到了代碼，但我不知道Objective-C的

#import "GTMNSData+zlib.h" 
+ (NSData*) uncompress: (NSData*) data 
{ 
    Byte *bytes= (Byte*)[data bytes]; 
    NSInteger length=[data length]; 
    NSMutableData* retdata=[[NSMutableData alloc] initWithCapacity:length*3.5]; 

    NSInteger bSize=0; 
    NSInteger offSet=0; 
    while (true) { 
     offSet+=bSize; 
     if (offSet>=length) { 
      break; 
     } 
     bSize=bytes[offSet]; 
     bSize+=(bytes[offSet+1]<<8); 
     bSize+=(bytes[offSet+2]<<16); 
     bSize+=(bytes[offSet+3]<<24); 
     offSet+=4; 
     if ((bSize==0)||(bSize+offSet>length)) { 
      LogError(@"Invalid"); 
      return data; 
     } 
     [retdata appendData:[NSData gtm_dataByInflatingBytes: bytes+offSet length:bSize]]; 
    } 
    return retdata; 
} 

Answer 1

根據Python的要求在文件：

• http://docs.python-requests.org/en/master/user/quickstart/#binary-response-content

它說：

You can also access the response body as bytes, for non-text requests: 

>>> r.content 
b'[{"repository":{"open_issues":0,"url":"https://github.com/... 

The gzip and deflate transfer-encodings are automatically decoded for you. 

如果REQ uests理解編碼，因此它應該已經被解壓縮。

如果您需要訪問原始數據以處理不同的解壓縮機制，請使用r.raw。

• http://docs.python-requests.org/en/master/user/quickstart/#raw-response-content

Answer 2

以下是Objective-C代碼的未經測試的翻譯：

import zlib 
import struct 

def uncompress(data): 
    length = len(data) 
    ret = [] 
    bSize = 0 
    offSet = 0 
    while True: 
     offSet += bSize 
     if offSet >= length: 
      break 

     bSize = struct.unpack("<i", data[offSet:offSet+4]) 
     offSet += 4 
     if bSize == 0 or bSize + offSet > length: 
      print "Invalid" 
      return ''.join(ret) 
     ret.append(zlib.decompress(data[offSet:offSet+bSize])) 

    return ''.join(ret)