From 77a817bfc298a221e3e623acf73c2a1e726c4ec6 Mon Sep 17 00:00:00 2001
From: Glenn Randers-Pehrson <glennrp at users.sourceforge.net>
Date: Thu, 17 Jan 2013 10:52:48 -0600
Subject: [PATCH] [libpng15] Change info_ptr->unknown_chunks_num to type
 png_uint_32

and test against INT_MAX instead of UINT_MAX in pngset.c
---
 png.h    | 2 +-
 pngset.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/png.h b/png.h
index db5ca8f..19768ee 100644
--- a/png.h
+++ b/png.h
@@ -786,7 +786,7 @@ defined(PNG_READ_BACKGROUND_SUPPORTED)
  defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
    /* Storage for unknown chunks that the library doesn't recognize. */
    png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
-   png_size_t unknown_chunks_num PNG_DEPSTRUCT;
+   png_uint_32 unknown_chunks_num PNG_DEPSTRUCT;
 #endif
 
 #ifdef PNG_iCCP_SUPPORTED
diff --git a/pngset.c b/pngset.c
index 94e5c92..b8890ec 100644
--- a/pngset.c
+++ b/pngset.c
@@ -1025,7 +1025,7 @@ png_set_unknown_chunks(png_structp png_ptr,
       return;
 
    if (num_unknowns < 0 ||
-       num_unknowns >= UINT_MAX-info_ptr->unknown_chunks_num ||
+       num_unknowns >= INT_MAX-info_ptr->unknown_chunks_num ||
        num_unknowns >= PNG_SIZE_MAX/png_sizeof(png_unknown_chunk)
        - info_ptr->unknown_chunks_num)
       np=NULL;
-- 
2.23.0