srec_stewie(5)

NAME
srec_stewie - Stewie's binary file format

DESCRIPTION
If you have a URL for documentation of this format, please let me know.

Any resemblance to the Motorola S-Record is superficial, and extends only to the data records. The header records and termination records are completely different. None of the other Motorola S-Records record type are available.

  The Records
All records start with an ASCII capital S character, value 0x53, followed by a type specifier byte. All records consist of binary bytes.

  The Header Record
Each file starts with a fixed four byte header record.
0x53 | 0x30 | 0x30 | 0x33

  The Data Records
Each data record consists of 5 fields. These are the type field, length field, address field, data field, and the checksum. The lines always start with a capital S character.
0x53 | Type | Record Length | Address | Data | Checksum

Type
    The type field is a one byte field that specifies whether the record has a two-byte address field (0x31), a three-byte address field (0x32) or a four-byte address field (0x33). The address is big-endian.

Record Length
    The record length field is a one byte field that specifies the number of bytes in the record following this byte.

Address
    This is a 2-, 3- or 4-byte address that specifies where the data in the record is to be loaded into memory.

Data
    The data field contains the executable code, memory-loadable data or descriptive information to be transferred.

Checksum
    The checksum is a one byte field that represents the least significant byte of the one's complement of the sum of the values represented by the bytes making up the record's length, address, and data fields.

  The Termination Record
Each file ends with a fixed two byte termination record.
0x53 | 0x38

  Size Multiplier
In general, binary data will expand in sized by approximately 1.2 times when represented with this format.

EXAMPLE
Here is an hex-dump example file. It contains the data “Hello, World[rq] to be loaded at address 0.
    0000: 53 30 30 33 53 31 10 00 00 48 65 6C 6C 6F 2C 20  S003S1...Hello,
    0010: 57 6F 72 6C 64 0A 9D 53 38                       World..S8