Update libpng from 1.6.22 -> 1.6.34

Updates third_party/libpng16 to Chromium's third_party/libpng @
a0e5c6a798a45a0dca175e2774ae0edc6aafc696 and applies PDFium specific
patches.

Originally landed as https://pdfium-review.googlesource.com/41910, but
reverted.

Bug=chromium:880322

Change-Id: Ib8249cb156135d028c02f67f9559bdd8695c04f5
Reviewed-on: https://pdfium-review.googlesource.com/42030
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

1 files changed, 0 insertions, 81 deletions

diff --git a/third_party/libpng16/0004-invalid-icc.patch b/third_party/libpng16/0004-invalid-icc.patch
deleted file mode 100644
index 0052c8e0f7..0000000000
--- a/third_party/libpng16/0004-invalid-icc.patch
+++ /dev/null
@@ -1,81 +0,0 @@
-diff --git a/png.c b/png.c
-index 35e14f63d..01d8d9bae 100644
---- a/png.c
-+++ b/png.c
-@@ -1931,8 +1931,8 @@ png_colorspace_set_sRGB(png_const_structrp png_ptr, png_colorspacerp colorspace,
- static const png_byte D50_nCIEXYZ[12] =
-    { 0x00, 0x00, 0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d };
- 
--int /* PRIVATE */
--png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
-+static int /* bool */
-+icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_uint_32 profile_length)
- {
-    if (profile_length < 132)
-@@ -1942,6 +1942,40 @@ png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    return 1;
- }
- 
-+#ifdef PNG_READ_iCCP_SUPPORTED
-+int /* PRIVATE */
-+png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace,
-+    png_const_charp name, png_uint_32 profile_length)
-+{
-+   if (!icc_check_length(png_ptr, colorspace, name, profile_length))
-+      return 0;
-+
-+   /* This needs to be here because the 'normal' check is in
-+    * png_decompress_chunk, yet this happens after the attempt to
-+    * png_malloc_base the required data.  We only need this on read; on write
-+    * the caller supplies the profile buffer so libpng doesn't allocate it.  See
-+    * the call to icc_check_length below (the write case).
-+    */
-+#  ifdef PNG_SET_USER_LIMITS_SUPPORTED
-+      else if (png_ptr->user_chunk_malloc_max > 0 &&
-+               png_ptr->user_chunk_malloc_max < profile_length)
-+         return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-+             "exceeds application limits");
-+#  elif PNG_USER_CHUNK_MALLOC_MAX > 0
-+      else if (PNG_USER_CHUNK_MALLOC_MAX < profile_length)
-+         return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-+             "exceeds libpng limits");
-+#  else /* !SET_USER_LIMITS */
-+      /* This will get compiled out on all 32-bit and better systems. */
-+      else if (PNG_SIZE_MAX < profile_length)
-+         return png_icc_profile_error(png_ptr, colorspace, name, profile_length,
-+             "exceeds system limits");
-+#  endif /* !SET_USER_LIMITS */
-+
-+   return 1;
-+}
-+#endif /* READ_iCCP */
-+
- int /* PRIVATE */
- png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    png_const_charp name, png_uint_32 profile_length,
-@@ -2379,7 +2413,7 @@ png_colorspace_set_ICC(png_const_structrp png_ptr, png_colorspacerp colorspace,
-    if ((colorspace->flags & PNG_COLORSPACE_INVALID) != 0)
-       return 0;
- 
--   if (png_icc_check_length(png_ptr, colorspace, name, profile_length) != 0 &&
-+   if (icc_check_length(png_ptr, colorspace, name, profile_length) != 0 &&
-        png_icc_check_header(png_ptr, colorspace, name, profile_length, profile,
-           color_type) != 0 &&
-        png_icc_check_tag_table(png_ptr, colorspace, name, profile_length,
-diff --git a/pngpriv.h b/pngpriv.h
-index 9ea023fea..633671352 100644
---- a/pngpriv.h
-+++ b/pngpriv.h
-@@ -1541,9 +1541,11 @@ PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
-    /* The 'name' is used for information only */
- 
- /* Routines for checking parts of an ICC profile. */
-+#ifdef PNG_READ_iCCP_SUPPORTED
- PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, png_const_charp name,
-    png_uint_32 profile_length), PNG_EMPTY);
-+#endif /* READ_iCCP */
- PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
-    png_colorspacerp colorspace, png_const_charp name,
-    png_uint_32 profile_length,