[deflate] Fix literal data length calculation
Fix incorrect calculation used to determine length of data to be copied within a literal data block, and add a test case to prevent this bug from going undetected in future. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -609,7 +609,7 @@ int deflate_inflate ( struct deflate *deflate,
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/* Calculate available amount of literal data */
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in_remaining = ( in->len - in->offset );
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len = deflate->remaining;
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if ( len < in_remaining )
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if ( len > in_remaining )
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len = in_remaining;
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/* Copy data to output buffer */
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@ -78,6 +78,12 @@ DEFLATE ( literal, DEFLATE_RAW,
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DATA ( 0x01, 0x04, 0x00, 0xfb, 0xff, 0x69, 0x50, 0x58, 0x45 ),
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DATA ( 0x69, 0x50, 0x58, 0x45 ) );
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/* "iPXE" string, no compression, split into two literals */
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DEFLATE ( split_literal, DEFLATE_RAW,
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DATA ( 0x00, 0x02, 0x00, 0xfd, 0xff, 0x69, 0x50, 0x01, 0x02, 0x00,
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0xfd, 0xff, 0x58, 0x45 ),
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DATA ( 0x69, 0x50, 0x58, 0x45 ) );
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/* Empty file */
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DEFLATE ( empty, DEFLATE_RAW, DATA ( 0x03, 0x00 ), DATA() );
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@ -215,6 +221,7 @@ static void deflate_test_exec ( void ) {
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/* Test as a single pass */
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deflate_ok ( deflate, &empty_literal, NULL );
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deflate_ok ( deflate, &literal, NULL );
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deflate_ok ( deflate, &split_literal, NULL );
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deflate_ok ( deflate, &empty, NULL );
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deflate_ok ( deflate, &hello_world, NULL );
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deflate_ok ( deflate, &hello_hello_world, NULL );
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