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improve error message when verifying magic bytes of the input #337

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merged 1 commit into from
Oct 18, 2023
Merged

improve error message when verifying magic bytes of the input #337

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10 changes: 8 additions & 2 deletions core/src/main/java/org/jboss/jandex/Indexer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2085,9 +2085,15 @@ private boolean isJDK11OrNewer(DataInputStream stream) throws IOException {
}

private void verifyMagic(DataInputStream stream) throws IOException {
final int magic = stream.readInt();
final int magic;
try {
magic = stream.readInt();
} catch (EOFException e) {
throw new EOFException("Input is not a valid class file; must begin with a 4-byte integer 0xCAFEBABE");
}
if (magic != 0xCA_FE_BA_BE) {
throw new IOException("Invalid Magic");
throw new IOException("Input is not a valid class file; must begin with a 4-byte integer 0xCAFEBABE, "
+ "but seen 0x" + Integer.toHexString(magic).toUpperCase());
}
}

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