Entropy coding method that assigns codewords to symbols based on their probability distributions. More general and efficient than arithmetic coding.
| Property | Value |
|---|---|
| Category | Compression Algorithms |
| Sub-category | Entropy Coding |
| Security status | Not classified |
| Complexity | Advanced |
| Inventor | G. Nigel N. Martin |
| Year | 1979 |
| Origin | 🇬🇧 United Kingdom |
| Source | algorithms/compression/range-coding.js |
Status: not classified — treat as unverified.
No vulnerabilities are recorded for this implementation.
7 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — Empty data round-trip test
Source: Educational test vector
| Field | Value |
|---|---|
input |
(empty) |
expected |
(empty) |
Vector 2 — Single character round-trip test
Source: Educational test vector
| Field | Value |
|---|---|
input |
41 |
expected |
(empty) |
Vector 3 — Repeated characters round-trip test
Source: Educational test vector
| Field | Value |
|---|---|
input |
4141 |
expected |
(empty) |
Vector 4 — Two different characters round-trip test
Source: Educational test vector
| Field | Value |
|---|---|
input |
4142 |
expected |
(empty) |
Vector 5 — Three different characters round-trip test
Source: Educational test vector
| Field | Value |
|---|---|
input |
414243 |
expected |
(empty) |
Vector 6 — Hello string round-trip test
Source: Educational test vector
| Field | Value |
|---|---|
input |
48656c6c6f |
expected |
(empty) |
Vector 7 — All 256 byte values round-trip test
Source: Regression test for decoder/model desync
| Field | Value |
|---|---|
input |
000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f 404142434445464748494a4b4c4d4e4f 505152535455565758595a5b5c5d5e5f 606162636465666768696a6b6c6d6e6f 707172737475767778797a7b7c7d7e7f 808182838485868788898a8b8c8d8e8f 909192939495969798999a9b9c9d9e9f a0a1a2a3a4a5a6a7a8a9aaabacadaeaf b0b1b2b3b4b5b6b7b8b9babbbcbdbebf c0c1c2c3c4c5c6c7c8c9cacbcccdcecf d0d1d2d3d4d5d6d7d8d9dadbdcdddedf e0e1e2e3e4e5e6e7e8e9eaebecedeeef f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff |
expected |
(empty) |