[Feature][ZXW-88]merge P50 version
Only Configure: No
Affected branch: master
Affected module: unknown
Is it affected on both ZXIC and MTK: only ZXIC
Self-test: Yes
Doc Update: No
Change-Id: I34667719d9e0e7e29e8e4368848601cde0a48408
diff --git a/ap/lib/libpng/libpng-1.6.37/contrib/arm-neon/linux-auxv.c b/ap/lib/libpng/libpng-1.6.37/contrib/arm-neon/linux-auxv.c
new file mode 100755
index 0000000..4d26bd3
--- /dev/null
+++ b/ap/lib/libpng/libpng-1.6.37/contrib/arm-neon/linux-auxv.c
@@ -0,0 +1,120 @@
+/* contrib/arm-neon/linux-auxv.c
+ *
+ * Copyright (c) 2014 Glenn Randers-Pehrson
+ * Written by Mans Rullgard, 2011.
+ * Last changed in libpng 1.6.10 [March 6, 2014]
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ *
+ * SEE contrib/arm-neon/README before reporting bugs
+ *
+ * STATUS: COMPILED, TESTED
+ * BUG REPORTS: png-mng-implement@sourceforge.net
+ *
+ * png_have_neon implemented for Linux versions which allow access to
+ * /proc/self/auxv. This is probably faster, cleaner and safer than the code to
+ * read /proc/cpuinfo in contrib/arm-neon/linux, however it is yet another piece
+ * of potentially untested code and has more complex dependencies than the code
+ * to read cpuinfo.
+ *
+ * This generic __linux__ implementation requires reading /proc/self/auxv and
+ * looking at each element for one that records NEON capabilities.
+ */
+#include <unistd.h> /* for POSIX 1003.1 */
+#include <errno.h> /* for EINTR */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <elf.h>
+#include <asm/hwcap.h>
+
+/* A read call may be interrupted, in which case it returns -1 and sets errno to
+ * EINTR if nothing was done, otherwise (if something was done) a partial read
+ * may result.
+ */
+static size_t
+safe_read(png_structp png_ptr, int fd, void *buffer_in, size_t nbytes)
+{
+ size_t ntotal = 0;
+ char *buffer = png_voidcast(char*, buffer_in);
+
+ while (nbytes > 0)
+ {
+ unsigned int nread;
+ int iread;
+
+ /* Passing nread > INT_MAX to read is implementation defined in POSIX
+ * 1003.1, therefore despite the unsigned argument portable code must
+ * limit the value to INT_MAX!
+ */
+ if (nbytes > INT_MAX)
+ nread = INT_MAX;
+
+ else
+ nread = (unsigned int)/*SAFE*/nbytes;
+
+ iread = read(fd, buffer, nread);
+
+ if (iread == -1)
+ {
+ /* This is the devil in the details, a read can terminate early with 0
+ * bytes read because of EINTR, yet it still returns -1 otherwise end
+ * of file cannot be distinguished.
+ */
+ if (errno != EINTR)
+ {
+ png_warning(png_ptr, "/proc read failed");
+ return 0; /* I.e., a permanent failure */
+ }
+ }
+
+ else if (iread < 0)
+ {
+ /* Not a valid 'read' result: */
+ png_warning(png_ptr, "OS /proc read bug");
+ return 0;
+ }
+
+ else if (iread > 0)
+ {
+ /* Continue reading until a permanent failure, or EOF */
+ buffer += iread;
+ nbytes -= (unsigned int)/*SAFE*/iread;
+ ntotal += (unsigned int)/*SAFE*/iread;
+ }
+
+ else
+ return ntotal;
+ }
+
+ return ntotal; /* nbytes == 0 */
+}
+
+static int
+png_have_neon(png_structp png_ptr)
+{
+ int fd = open("/proc/self/auxv", O_RDONLY);
+ Elf32_auxv_t aux;
+
+ /* Failsafe: failure to open means no NEON */
+ if (fd == -1)
+ {
+ png_warning(png_ptr, "/proc/self/auxv open failed");
+ return 0;
+ }
+
+ while (safe_read(png_ptr, fd, &aux, sizeof aux) == sizeof aux)
+ {
+ if (aux.a_type == AT_HWCAP && (aux.a_un.a_val & HWCAP_NEON) != 0)
+ {
+ close(fd);
+ return 1;
+ }
+ }
+
+ close(fd);
+ return 0;
+}