Define IETF RFC 4648 schemas (#40)

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

README.markdown

@@ -53,6 +53,7 @@ expressed as JSON Schema definitions.
 | IEEE | [IEEE Std 754-2019](https://ieeexplore.ieee.org/document/8766229) | IEEE Standard for Floating-Point Arithmetic |
 | IEEE | [IEEE Std 1003.1-2017](https://pubs.opengroup.org/onlinepubs/9699919799/) | IEEE Standard for Information Technology—Portable Operating System Interface (POSIX) Base Specifications, Issue 7 |
 | IETF | [RFC 3986](https://www.rfc-editor.org/rfc/rfc3986) | Uniform Resource Identifier (URI): Generic Syntax |
+| IETF | [RFC 4648](https://www.rfc-editor.org/rfc/rfc4648) | The Base16, Base32, and Base64 Data Encodings |
 | IETF | [RFC 4918](https://www.rfc-editor.org/rfc/rfc4918) | HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV) |
 | IETF | [RFC 5322](https://www.rfc-editor.org/rfc/rfc5322) | Internet Message Format |
 | IETF | [RFC 5646](https://www.rfc-editor.org/rfc/rfc5646) | Tags for Identifying Languages (BCP 47) |

schemas/ietf/encoding/base16.json

@@ -0,0 +1,20 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "RFC 4648 Base16 Encoding",
+  "description": "Uses digits 0-9 and letters A-F (case-insensitive). Each byte encodes to exactly 2 characters, no padding required",
+  "examples": [
+    "48656C6C6F20576F726C6421",
+    "DEADBEEF",
+    "0FB7",
+    "666F6F626172",
+    ""
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.rfc-editor.org/rfc/rfc4648.html#section-8" ],
+  "type": "string",
+  "not": {
+    "pattern": "[\\x00-\\x1F]"
+  },
+  "pattern": "^([0-9A-Fa-f]{2})*$",
+  "contentEncoding": "base16"
+}

schemas/ietf/encoding/base32.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "RFC 4648 Base32 Encoding",
+  "description": "Uses uppercase letters A-Z and digits 2-7 (32 characters total). Padding with = to multiple of 8 characters",
+  "examples": [
+    "JBSWY3DPEBLW64TMMQ======",
+    "MFRGG===",
+    "MZXW6===",
+    "MZXW6YQ=",
+    "MZXW6YTB",
+    ""
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.rfc-editor.org/rfc/rfc4648.html#section-6" ],
+  "type": "string",
+  "pattern": "^([A-Z2-7]{8})*([A-Z2-7]{2}={6}|[A-Z2-7]{4}={4}|[A-Z2-7]{5}={3}|[A-Z2-7]{7}=)?$",
+  "contentEncoding": "base32"
+}

schemas/ietf/encoding/base32hex.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "RFC 4648 Base32hex Encoding",
+  "description": "Uses digits 0-9 and uppercase letters A-V (32 characters total). Padding with = to multiple of 8 characters",
+  "examples": [
+    "91IMOR3F41BMUSJCCG======",
+    "C5H66===",
+    "CPNMU===",
+    "CPNMUO8=",
+    "CPNMUOJ1",
+    ""
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.rfc-editor.org/rfc/rfc4648.html#section-7" ],
+  "type": "string",
+  "pattern": "^([0-9A-V]{8})*([0-9A-V]{2}={6}|[0-9A-V]{4}={4}|[0-9A-V]{5}={3}|[0-9A-V]{7}=)?$",
+  "contentEncoding": "base32hex"
+}

schemas/ietf/encoding/base64.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "RFC 4648 Base64 Encoding",
+  "description": "Uses uppercase letters A-Z, lowercase letters a-z, digits 0-9, plus sign (+), and forward slash (/), with equals sign (=) used for padding",
+  "examples": [
+    "R0lGODlhAQABAAAAACw=",
+    "SGVsbG8gV29ybGQh",
+    "YQ==",
+    "YWI=",
+    "YWJj",
+    ""
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.rfc-editor.org/rfc/rfc4648.html#section-4" ],
+  "type": "string",
+  "pattern": "^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$",
+  "contentEncoding": "base64"
+}

schemas/ietf/encoding/base64url.json

@@ -0,0 +1,18 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "RFC 4648 Base64url Encoding",
+  "description": "Base64 encoding with URL and filename safe alphabet as defined in RFC 4648 section 5. Uses hyphen (-) and underscore (_) instead of plus (+) and slash (/)",
+  "examples": [
+    "R0lGODlhAQABAAAAACw=",
+    "SGVsbG8gV29ybGQh",
+    "YQ==",
+    "YWI=",
+    "YWJj",
+    ""
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.rfc-editor.org/rfc/rfc4648.html#section-5" ],
+  "type": "string",
+  "pattern": "^([A-Za-z0-9_-]{4})*([A-Za-z0-9_-]{2}==|[A-Za-z0-9_-]{3}=)?$",
+  "contentEncoding": "base64url"
+}