include/u-boot, lib/zlib: add sources for zlib decompression

Add zlib (v1.2.11) uncompr() function to U-Boot. SquashFS depends on
this function to decompress data from a raw disk image. The actual
support for zlib into SquashFS sources will be added in a follow-up
commit.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/include/u-boot/zlib.h b/include/u-boot/zlib.h
index e23ceb50ca..a33cc8780d 100644
--- a/include/u-boot/zlib.h
+++ b/include/u-boot/zlib.h
@@ -110,6 +110,12 @@ extern "C" {
 #  define voidp                 z_voidp
 #endif
 
+#if defined(ZLIB_CONST) && !defined(z_const)
+#  define z_const const
+#else
+#  define z_const
+#endif
+
 #if defined(__MSDOS__) && !defined(MSDOS)
 #  define MSDOS
 #endif
@@ -710,6 +716,32 @@ ZEXTERN  uInt ZEXPORT crc32  OF((uInt crc, const Bytef *buf, uInt len));
      if (crc != original_crc) error();
 */
 
+ZEXTERN int ZEXPORT uncompress OF((Bytef *dest, uLongf *destLen,
+				   const Bytef *source, uLong sourceLen));
+/*
+     Decompresses the source buffer into the destination buffer.  sourceLen is
+   the byte length of the source buffer.  Upon entry, destLen is the total size
+   of the destination buffer, which must be large enough to hold the entire
+   uncompressed data.  (The size of the uncompressed data must have been saved
+   previously by the compressor and transmitted to the decompressor by some
+   mechanism outside the scope of this compression library.) Upon exit, destLen
+   is the actual size of the uncompressed data.
+
+     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
+   enough memory, Z_BUF_ERROR if there was not enough room in the output
+   buffer, or Z_DATA_ERROR if the input data was corrupted or incomplete.  In
+   the case where there is not enough room, uncompress() will fill the output
+   buffer with the uncompressed data up to that point.
+*/
+
+ZEXTERN int ZEXPORT uncompress2 OF((Bytef *dest, uLongf *destLen,
+				    const Bytef *source, uLong *sourceLen));
+/*
+     Same as uncompress, except that sourceLen is a pointer, where the
+   length of the source is *sourceLen.  On return, *sourceLen is the number of
+   source bytes consumed.
+*/
+
 ZEXTERN int ZEXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
                                       const char *version, int stream_size));
 #define inflateInit(strm) \