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[deflate] Fix literal data length calculation

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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>
This commit is contained in:
Michael Brown
2014-01-08 23:21:23 +01:00
parent 9bdfc36bcc
commit 97fd5ccdd8
2 changed files with 8 additions and 1 deletions
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2
src/crypto/deflate.c
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@@ -609,7 +609,7 @@ int deflate_inflate ( struct deflate *deflate,
/* Calculate available amount of literal data */
in_remaining = ( in->len - in->offset );
len = deflate->remaining;
if ( len < in_remaining )
if ( len > in_remaining )
len = in_remaining;
/* Copy data to output buffer */

7
src/tests/deflate_test.c
View File

@@ -78,6 +78,12 @@ DEFLATE ( literal, DEFLATE_RAW,
DATA ( 0x01, 0x04, 0x00, 0xfb, 0xff, 0x69, 0x50, 0x58, 0x45 ),
DATA ( 0x69, 0x50, 0x58, 0x45 ) );
/* "iPXE" string, no compression, split into two literals */
DEFLATE ( split_literal, DEFLATE_RAW,
DATA ( 0x00, 0x02, 0x00, 0xfd, 0xff, 0x69, 0x50, 0x01, 0x02, 0x00,
0xfd, 0xff, 0x58, 0x45 ),
DATA ( 0x69, 0x50, 0x58, 0x45 ) );
/* Empty file */
DEFLATE ( empty, DEFLATE_RAW, DATA ( 0x03, 0x00 ), DATA() );
@@ -215,6 +221,7 @@ static void deflate_test_exec ( void ) {
/* Test as a single pass */
deflate_ok ( deflate, &empty_literal, NULL );
deflate_ok ( deflate, &literal, NULL );
deflate_ok ( deflate, &split_literal, NULL );
deflate_ok ( deflate, &empty, NULL );
deflate_ok ( deflate, &hello_world, NULL );
deflate_ok ( deflate, &hello_hello_world, NULL );