endianness

来源： https://stackoverflow.com/questions/19152836/how-to-make-gdb-recognize-bi-endian-code

来源： https://stackoverflow.com/questions/27551167/what-is-the-endianness-of-binary-literals-in-c14

问题 I was reading about little and big endian representations from this site http://www.geeksforgeeks.org/little-and-big-endian-mystery/. Suppose we have a number 0x01234567, then in little endian it is stored as (67)(45)(23)(01) and in Big endian it is stored as (01)(23)(45)(67). char *s= "ABCDEF" int *p = (int *)s; printf("%d",*(p+1)); // prints 17475 (value of DC) After seeing the printed value here in the above code, it seems that string is stored as (BA)(DC)(FE). Why is it not stored like

问题 I was reading about little and big endian representations from this site http://www.geeksforgeeks.org/little-and-big-endian-mystery/. Suppose we have a number 0x01234567, then in little endian it is stored as (67)(45)(23)(01) and in Big endian it is stored as (01)(23)(45)(67). char *s= "ABCDEF" int *p = (int *)s; printf("%d",*(p+1)); // prints 17475 (value of DC) After seeing the printed value here in the above code, it seems that string is stored as (BA)(DC)(FE). Why is it not stored like

问题 I was reading about little and big endian representations from this site http://www.geeksforgeeks.org/little-and-big-endian-mystery/. Suppose we have a number 0x01234567, then in little endian it is stored as (67)(45)(23)(01) and in Big endian it is stored as (01)(23)(45)(67). char *s= "ABCDEF" int *p = (int *)s; printf("%d",*(p+1)); // prints 17475 (value of DC) After seeing the printed value here in the above code, it seems that string is stored as (BA)(DC)(FE). Why is it not stored like

问题 I know the WAV file format uses signed integers for 16-bit samples. It also stores them in little-endian order, meaning the lowest 8 bits come first, then the next, etc. Is the special sign bit on the first byte, or is the special sign bit always on the most significant bit (highest value)? Meaning: Which one is the sign bit in the WAV format? ++---+---+---+---+---+---+---+---++---+---+---+---+---+---+---+---++ || a | b | c | d | e | f | g | h || i | j | k | l | m | n | o | p || ++---+---+---

问题 I know the WAV file format uses signed integers for 16-bit samples. It also stores them in little-endian order, meaning the lowest 8 bits come first, then the next, etc. Is the special sign bit on the first byte, or is the special sign bit always on the most significant bit (highest value)? Meaning: Which one is the sign bit in the WAV format? ++---+---+---+---+---+---+---+---++---+---+---+---+---+---+---+---++ || a | b | c | d | e | f | g | h || i | j | k | l | m | n | o | p || ++---+---+---

问题 I've got two PCAP files, A and B . A has a 'magic number' in the header of d4 c3 b2 a1 , B has a 'magic number' in the header of 4d 3c b2 a1 . According to the wireshark documentation (http://wiki.wireshark.org/Development/LibpcapFileFormat), only 0xd4c3b2a1 and 0xa1b2c3d4 are valid magic numbers, which leads me to think that B is not a valid magic number. Running file on linux backs this up, with the output of file A being: tcpdump capture file (little-endian) - version 2.4 (Ethernet,

问题 I'd like to use python read a large binary file in ieee big endian 64bit floating point format, but am having trouble getting the correct values. I have a working method in matlab, as below: fid=fopen(filename,'r','ieee-be'); data=fread(fid,inf,'float64',0,'ieee-be'); fclose(fid) I've tried the following in python: data = np.fromfile(filename, dtype='>f', count=-1) This method doesn't throw any errors, but the values it reads are extremely large and incorrect. Can anyone help with a way to

问题 I'd like to use python read a large binary file in ieee big endian 64bit floating point format, but am having trouble getting the correct values. I have a working method in matlab, as below: fid=fopen(filename,'r','ieee-be'); data=fread(fid,inf,'float64',0,'ieee-be'); fclose(fid) I've tried the following in python: data = np.fromfile(filename, dtype='>f', count=-1) This method doesn't throw any errors, but the values it reads are extremely large and incorrect. Can anyone help with a way to