Increase read buffer to reduce total syscalls

Author: heshpdx

libs/libpugiutil/src/pugixml_loc.cpp

@@ -30,7 +30,7 @@ void loc_data::build_loc_data() {
 
     std::ptrdiff_t offset = 0;
 
-    char buffer[1024];
+    char buffer[1048576];
     std::size_t size;
 
     while ((size = fread(buffer, 1, sizeof(buffer), f)) > 0) {

libs/libvtrutil/src/vtr_digest.cpp

@@ -21,7 +21,7 @@ std::string secure_digest_stream(std::istream& is) {
     //Read the stream in chunks and calculate the SHA256 digest
     picosha2::hash256_one_by_one hasher;
 
-    std::array<char, 1024> buf;
+    std::array<char, 1048576> buf;
     while (!is.eof()) {
         //Process a chunk
         is.read(buf.data(), buf.size());