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### Binary Header
Fixed 32-bytes
-----------------------------------------------------------------
| MAGIC |
-----------------------------------------------------------------
| VERSION (0) | ENTRY SIZE (uint16BE) | ALGO NAME LEN |
-----------------------------------------------------------------
| |
| |
| |
| ALGORITHM NAME (lower-case string) |
| |
| |
-----------------------------------------------------------------
MAGIC and ENTRY SIZE are both "big-endian", meaning that the "first" (aka
"most-significant" byte is in the "first" memory location (aka, "lowest
address").
PREFIX LEN is max 24 (bytes)
offset: 32 + entrySize * entryIndex
count: (fileSize - 32) / entrySize
### SLEEP API
SleepStorage trait
SleepFile struct/impl
get_magic() -> u32
get_algorithm() -> &str
read(index) -> &bytes[]
write(index, &bytes[])
len() -> u64
First time around just do regular file seek() stuff
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