[shuwenwei]

Problem

ReadWriteIOUtils assumed that a single InputStream.read() call would fill the requested buffer. The InputStream contract permits partial reads, so valid input could fail with Intend to read N bytes but M are actually returned.

This was exposed when a ConfigNode snapshot schema was read through a buffered stream: a schema larger than 8 KB crossed a buffer boundary and produced Intend to read 4 bytes but 3 are actually returned.

Change

• Read fixed-width values and length-prefixed strings until the requested bytes are available or EOF is reached.
• Treat single-byte reader EOF as EOFException.
• Avoid zero-read infinite loops.
• Remove an extra read in readAsPossible(TsFileInput, long, ByteBuffer) that silently consumed data.
• Make BytesUtils.safeReadInputStreamToBytes fail on truncated input instead of returning zero-filled data.

Validation

Regression tests cover fragmented streams that return zero bytes once and then short reads. Tests and compilation were not run locally, per task constraints.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.52542% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.49%. Comparing base (931a5d3) to head (a72c55e).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...java/org/apache/tsfile/utils/ReadWriteIOUtils.java	91.83%	4 Missing ⚠️
.../main/java/org/apache/tsfile/utils/BytesUtils.java	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1061      +/-   ##
===========================================
+ Coverage    66.47%   66.49%   +0.02%     
===========================================
  Files          773      773              
  Lines        55802    55838      +36     
  Branches      8948     8955       +7     
===========================================
+ Hits         37092    37131      +39     
+ Misses       17053    17051       -2     
+ Partials      1657     1656       -1     

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