fix: Reduce max size for png and exr input

Signed-off-by: Dharshan Vishwanatha <dharshanv1999@gmail.com>

Author: DharshanV

src/openexr.imageio/exrinput.cpp

@@ -1024,7 +1024,7 @@ OpenEXRInput::seek_subimage(int subimage, int miplevel)
     m_miplevel = miplevel;
     m_spec     = part.spec;
 
-    if (!check_open(m_spec, { 0, 1 << 30, 0, 1 << 30, 0, 1 << 16, 0, 1 << 16 }))
+    if (!check_open(m_spec, { 0, 1 << 20, 0, 1 << 20, 0, 1 << 16, 0, 1 << 12 }))
         return false;
 
     if (miplevel == 0 && part.levelmode == Imf::ONE_LEVEL) {

src/png.imageio/pnginput.cpp

@@ -163,7 +163,7 @@ PNGInput::open(const std::string& name, ImageSpec& newspec)
                                  m_interlace_type, m_bg, m_spec,
                                  m_keep_unassociated_alpha);
     if (!ok || m_err
-        || check_open(m_spec, { 0, 1 << 30, 0, 1 << 30, 0, 1, 0, 4 })) {
+        || !check_open(m_spec, { 0, 1 << 16, 0, 1 << 16, 0, 1, 0, 4 })) {
         close();
         return false;
     }