Sample
convert 3.1.2: Configure fallback handling and validation bounds for unmapped characters and undefined byte sequences in CodePage
Verified sample for pub convert 3.1.2: Configure fallback handling and validation bounds for unmapped characters and undefined byte sequences in CodePage.…
sha256:e790c49d1fb497727a63db0bd94d5804512cbd6739117627ea6133dbbbd06ad9
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MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
dart linux x64 dart dart pub
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| dart 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-17 |
| dart 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-18 |
Case
HOW- Goal
- Configure fallback handling and validation bounds for unmapped characters and undefined byte sequences in CodePage
- Packages
- Symbols
-
- CodePage
- CodePage.encode
- CodePage.decode
- latin2
- Environment
- dart
- Created
- 2026-08-17T13:02:57Z
Contract
- CodePage.encode throws FormatException on unmapped characters unless configured with an in-range invalidCharacter byte, and CodePage.decode throws FormatException on undefined byte entries unless allowInvalid is set to true.
- latin2.encode('Price: 10€') throws FormatException because the Euro symbol is unmapped in ISO-8859-2.
- latin2.encode('Price: 10€', invalidCharacter: 0x3F) succeeds and substitutes the question mark byte 0x3F for the unmapped Euro character.
- latin2.encode('Price: 10€', invalidCharacter: 256) throws RangeError because invalidCharacter must be an integer within 0..255.
- latin2.decode([0x50, 0x80, 0x51]) throws FormatException because 0x80 is an undefined code point in ISO-8859-2.
- latin2.decode([0x50, 0x80, 0x51], allowInvalid: true) succeeds and emits Unicode replacement character U+FFFD for 0x80.
- latin2.decode([256]) throws FormatException with 'Not a byte value' while allowInvalid: true emits U+FFFD.
- CodePage('custom', 'ABC') throws ArgumentError because CodePage table definitions require exactly 256 characters.
Files
- NOTES.md
- csx.json
- pubspec.lock
- pubspec.yaml
- test/contract.dart