Python generically parse data into object structure

Question

What I want to know is if I have a defined structured object with known parameters and a known order. I want to parse a binary blob into this structure in a generic way.

For example, I know that my file is a binary file of this structure

typedef struct { 
         uint     frCompressedSize;
         uint     frUncompressedSize;
         ushort   frFileNameLength;
         ushort   frExtraFieldLength;
         char     frFileName[ frFileNameLength ];
         uchar    frExtraField[ frExtraFieldLength ];
         uchar    frData[ frCompressedSize ];
     } ZIPFILERECORD;

Is there a better way to do this than reading in individual fields at a time in a hard coded manner? In my real code the structure has almost 100 parameters so the hardcoded method is not my first choice.

Any Ideas?

thanks!

yonilevy · Accepted Answer · 2013-02-25 20:15:24Z

3

You are looking for the python struct library

answered Feb 25, 2013 at 20:15

yonilevy

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1 Comment

Without Me It Just Aweso Over a year ago

This got me half way there, I had to break up the structure into two parts, since the last 3 parameter sizes relied on the values read in on the top paremters. Dividing it up into several struct.unpack calls solved my problem in much less than the hardcoded parsing I thougth I was going to have to do. thanks!

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