core: zlib: fix build warning when _LFS64_LARGEFILE is not defined

In zlib, _LFS64_LARGEFILE is expected to be a boolean directive, either
1 (true) or 0 (false). Depending on toolchain version and d

core: zlib: fix build warning when _LFS64_LARGEFILE is not defined

In zlib, _LFS64_LARGEFILE is expected to be a boolean directive, either
1 (true) or 0 (false). Depending on toolchain version and directives
build may produces warnings (as shown below with gcc 9.3) when the macro
is not defined hence this change to default it to value 0 (false).

core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
| ^~~~~~~~~~~~~~~~
In file included from core/lib/zlib/adler32.c:9:
core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
| ^~~~~~~~~~~~~~~~
CC out/core/lib/zlib/zutil.o
In file included from core/lib/zlib/inftrees.c:7:
core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
| ^~~~~~~~~~~~~~~~
In file included from core/lib/zlib/inflate.c:84:
core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
| ^~~~~~~~~~~~~~~~
In file included from core/lib/zlib/zutil.c:9:
core/lib/zlib/zutil.h:196:39: warning: "_LFS64_LARGEFILE" is not defined, evaluates to 0 [-Wundef]
196 | (!defined(_LARGEFILE64_SOURCE) || _LFS64_LARGEFILE-0 == 0)
| ^~~~~~~~~~~~~~~~

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] wa

Add SPDX license identifiers

Adds one SPDX-License-Identifier line [1] to each source files that
contains license text.

Generated by [2]:
spdxify.py --add-spdx optee_os/

The scancode tool [3] was used to double check the license matching
code in the Python script. All the licenses detected by scancode are
either detected by spdxify.py, or have no SPDX identifier, or are false
matches.

Link: [1] https://spdx.org/licenses/
Link: [2] https://github.com/jforissier/misc/blob/f7b56c8/spdxify.py
Link: [3] https://github.com/nexB/scancode-toolkit
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Joakim Bech <joakim.bech@linaro.org>

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Add support for compressed early TAs

Add decompression code to the early TA loader and update the Python
script accordingly. The compression algorithm is "deflate", which is
used by zlib and gzip in

Add support for compressed early TAs

Add decompression code to the early TA loader and update the Python
script accordingly. The compression algorithm is "deflate", which is
used by zlib and gzip in particular. It allows for compression ratios
comprised between 3 (for bigger TAs) and 4.7 (for smaller ones). Those
numbers were observed with 32-bit TAs (QEMU).

On QEMU (armv7), the code size overhead when CFG_EARLY_TA=y, including
the decompressor, is 12K when DEBUG=0 or 20K when DEBUG=1. The
decompressor allocates about 39K of heap.

Another library compatible with zlib was tried for comparison [1].
The code size overhead with miniz was 8K (DEBUG=0) or 16K (DEBUG=1).
On the other hand, the dynamic allocation was about 43K, so the total
memory required was about same. Speed was not compared. In the end,
zlib was preferred for licensing reasons and because it is widely used.

Link: [1] https://github.com/richgel999/miniz
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (QEMU)
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (QEMUv8, pager)
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (D02 32/64 bits)
Tested-by: Jerome Forissier <jerome.forissier@linaro.org> (D02 32/64 bits, pager)
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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Import zlib v1.2.11

Import the decompression code from zlib v1.2.11. From the project's
README:

"zlib 1.2.11 is a general purpose data compression library. [...] The
data format used by the zlib li

Import zlib v1.2.11

Import the decompression code from zlib v1.2.11. From the project's
README:

"zlib 1.2.11 is a general purpose data compression library. [...] The
data format used by the zlib library is described by RFCs (Request for
Comments) 1950 to 1952 in the files rfc1950 (zlib format), rfc1951
(deflate format) and rfc1952 (gzip format)."

This code will be used in a later commit to decompress early TAs.
Only the inflate() function is needed, and the library is configured
without gzip support. The source files that are not required
for inflate() are left aside.

The library is licensed under a permissive license, see `zlib.h`.

Link: http://tools.ietf.org/html/rfc1950
Link: http://tools.ietf.org/html/rfc1951
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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