Knowing a nice person is good, being nice, even better but in the computer world, there is this funky concept of “nice” which determines the scheduling priority of a process. The scope here is that you are doing some programming and you want to be able to control or set the priority. You can set… Read More »
In the last 3 years I have researched hundreds of APIs from SaaS based applications from around the world, analysed in detail around 60 APIs and deep dived into around 20 APIs. I’ve experienced working with great APIs, not so great APIs and everything in between. Background To understand what I’ve learnt, let’s take a… Read More »
If you have come across some code with reference to swab32 or bswap_32 and wondered how it works, here is the answer. swab32 will probably be a function that calls bswap_32 which will probably be a macro. The macro will probably be defined as: ( (((x) << 24) & 0xff000000u) | (((x) << 8) &… Read More »
You may have come across this image on Wikipedia when reading about endianness. While it is great, in practice when I’m viewing content in memory, it is displayed horizontally instead of vertically. So for those visual people out there, here is another take. Big endian is defined at placing the Most Significant… Read More »
There are 2 ways of ordering your search results in the issue navigator within JIRA. You can click on the column header to sort the issues or you can use the “Order By” clause via JQL (JIRA Query Language). A JQL example would be “project = demo ORDER BY Assignee ASC” However, if you want… Read More »
This is all about endianness. That is, how the bits are arranged in memory. You can arrange these bits in memory 2 ways. In big endian or in little endian. Go to wikipedia for some background but esssentially big endian is the way the decimal system works and little endian is the reverse of this.… Read More »
Very neat book. Good movie as well!
If you have had the pleasure of delving into the block chain, you may have come across the term magic number. This is the first 4 bytes of every block in the block chain and is defined as: Network Magic value Sent over wire as main 0xD9B4BEF9 F9 BE B4 D9 testnet 0xDAB5BFFA FA BF… Read More »
There are lots of articles around how Bitcoin addresses are created. Most of the time you’ll be shown a few command lines to run and magically the results appear. For example, >> bitcoin-cli getnewaddress will output a new Bitcoin address in the command line of the Bitcoin-qt application but how does it work under the… Read More »
Very hands on with lots of screen shots. Unfortunate with lots of references to Mt Gox. 166 pages with good references. Readable in a few hours.