Your application must interface with an old-school mainframe MPS7 for payment processing. This means consuming a proprietary binary protocol format.
You must read in a file, data.dat, and parse it according to the
specification in Notes below.
You must answer the following questions:
- What is the total amount in dollars of debits?
- What is the total amount in dollars of credits?
- How many autopays were started?
- How many autopays were ended?
- What is balance of user ID 2456938384156277127?
You must supply your source code as part of your answer. Write your code in your best programming language.
MPS7 transaction log specification:
Header:
| 4 byte magic string "MPS7" | 1 byte version | 4 byte (uint32) # of records |
Record:
| 1 byte record type enum | 4 byte (uint32) Unix timestamp | 8 byte (uint64) user ID |
Record type enum:
- 0x00: Debit
- 0x01: Credit
- 0x02: StartAutopay
- 0x03: EndAutopay
For Debit and Credit record types, there is an additional field, an 8 byte (float64) amount in dollars, at the end of the record.
All multi-byte fields are encoded in network byte order.