Add POSIX file stream fallback

[shai-almog]

Summary

• implement POSIX-based FileInputStream and FileOutputStream natives for non-iOS targets in java_io_FileStreams.m
• ensure java_io_FileStreams.m is copied into generated translator projects alongside other native sources

Testing

• not run (not requested)

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Codex Task

[github-actions]

✅ Continuous Quality Report

Test & Coverage

• ✅ Tests: 2281 total, 0 failed, 0 skipped
• 📊 Line coverage: 52.90% [HTML preview] [Download]
  • Lowest covered classes
    • com.codename1.ui.BrowserWindow$BrowserForm – 0.00%
    • com.codename1.processing.TextEvaluator – 3.85%
    • com.codename1.charts.views.PieChart – 4.00%
    • com.codename1.charts.views.PieMapper – 4.88%
    • com.codename1.charts.views.ScatterChart – 5.32%
    • com.codename1.ui.list.GenericListCellRenderer$Monitor – 5.33%
    • com.codename1.ui.Display$EdtException – 5.56%
    • com.codename1.testing.AbstractTest – 6.05%
    • com.codename1.ui.Transform$ImmutableTransform – 6.06%
    • com.codename1.charts.views.DoughnutChart – 6.25%

Static Analysis

• ❌ SpotBugs: 520 findings (High: 8, Normal: 321, Low: 191) [HTML preview] [Download]
  • Top findings
    • High: CodenameOne/src/com/codename1/charts/views/XYChart.java:128 – Call to equals() comparing different types (rule: EC_UNRELATED_TYPES)
    • High: CodenameOne/src/com/codename1/io/NetworkManager.java:1064 – equals method always returns false (rule: EQ_ALWAYS_FALSE)
    • High: CodenameOne/src/com/codename1/io/gzip/InfBlocks.java:153 – Self assignment of field (rule: SA_FIELD_SELF_ASSIGNMENT)
    • High: CodenameOne/src/com/codename1/io/gzip/InfBlocks.java:154 – Self assignment of field (rule: SA_FIELD_SELF_ASSIGNMENT)
    • High: CodenameOne/src/com/codename1/io/gzip/InfBlocks.java:158 – Self assignment of field (rule: SA_FIELD_SELF_ASSIGNMENT)
    • …and 515 more
• ❌ PMD: 2726 findings (P2: 1, P3: 632, P4: 2093) [HTML preview] [Download]
  • Top findings
    • P2: CodenameOne/src/com/codename1/ui/Display.java:1022 – Avoid using a branching statement as the last in a loop. (rule: AvoidBranchingStatementAsLastInLoop)
    • P3: CodenameOne/src/com/codename1/charts/views/LineChart.java:208 – These nested if statements could be combined (rule: CollapsibleIfStatements)
    • P3: CodenameOne/src/com/codename1/facebook/FacebookRESTService.java:76 – Avoid unused constructor parameters such as 'token'. (rule: UnusedFormalParameter)
    • P3: CodenameOne/src/com/codename1/impl/CodenameOneImplementation.java:8470 – These nested if statements could be combined (rule: CollapsibleIfStatements)
    • P3: CodenameOne/src/com/codename1/impl/FullScreenAdService.java:103 – These nested if statements could be combined (rule: CollapsibleIfStatements)
    • …and 2721 more
• ❌ Checkstyle: 220265 findings (Warning: 220265) [HTML preview] [Download]
  • Top findings
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:30:1 – Extra separation in import group before 'java.io.IOException' (rule: CustomImportOrderCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:32 – First sentence of Javadoc is missing an ending period. (rule: SummaryJavadocCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:36 – Line is longer than 100 characters (found 143). (rule: LineLengthCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:39:5 – 'member def modifier' has incorrect indentation level 4, expected level should be 2. (rule: IndentationCheck)
    • Warning: CodenameOne/src/com/codename1/db/ThreadSafeDatabase.java:40:5 – 'member def modifier' has incorrect indentation level 4, expected level should be 2. (rule: IndentationCheck)
    • …and 220260 more

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