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OcCompressionLib: Sync zlib up to d71dc66fa8a153fb6e7c626847095d9697a6cf42

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This commit is contained in:
vit9696 2020-02-16 03:35:13 +03:00
parent 1e97810557
commit 035609cd6b
3 changed files with 8 additions and 10 deletions
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2
Library/OcCompressionLib/zlib/crc32.c
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@ -224,7 +224,7 @@ local once_t made = ONCE_INIT;
is just exclusive-or, and multiplying a polynomial by x is a right shift by
one. If we call the above polynomial p, and represent a byte as the
polynomial q, also with the lowest power in the most significant bit (so the
byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
byte 0xb1 is the polynomial x^7+x^3+x^2+1), then the CRC is (q*x^32) mod p,
where a mod b means the remainder after dividing a by b.
This calculation is done using the shift-register method of multiplying and

12
Library/OcCompressionLib/zlib/zlib.h
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@ -1690,8 +1690,9 @@ ZEXTERN void ZEXPORT gzclearerr OF((gzFile file));
ZEXTERN uLong ZEXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
/*
Update a running Adler-32 checksum with the bytes buf[0..len-1] and
return the updated checksum. If buf is Z_NULL, this function returns the
required initial value for the checksum.
return the updated checksum. An Adler-32 value is in the range of a 32-bit
unsigned integer. If buf is Z_NULL, this function returns the required
initial value for the checksum.
An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
much faster.
@ -1727,9 +1728,10 @@ ZEXTERN uLong ZEXPORT adler32_combine OF((uLong adler1, uLong adler2,
ZEXTERN uLong ZEXPORT crc32 OF((uLong crc, const Bytef *buf, uInt len));
/*
Update a running CRC-32 with the bytes buf[0..len-1] and return the
updated CRC-32. If buf is Z_NULL, this function returns the required
initial value for the crc. Pre- and post-conditioning (one's complement) is
performed within this function so it shouldn't be done by the application.
updated CRC-32. A CRC-32 value is in the range of a 32-bit unsigned integer.
If buf is Z_NULL, this function returns the required initial value for the
crc. Pre- and post-conditioning (one's complement) is performed within this
function so it shouldn't be done by the application.
Usage example:

4
Library/OcCompressionLib/zlib/zlib_uefi.c
View File

@ -34,8 +34,6 @@ void ZLIB_INTERNAL zcfree (opaque, ptr)
FreePool (ptr);
}
#ifndef OC_USE_SSH_ZLIB
UINT8 *
CompressZLIB (
OUT UINT8 *Dst,
@ -77,5 +75,3 @@ DecompressZLIB (
return 0;
}
#endif // OC_USE_SSH_ZLIB