Fix File::readString to work with binary data #1030
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Previously, File::readString used a C-style string as an intermediate buffer via the String += operator. This treats a NUL byte as a terminator, making this function work incorrectly if the File contains binary data. This commit switches the function to use String::concat, which doesn't treat NUL bytes any differently (and is a bit faster, because it doesn't need to use strlen).
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Previously,
File::readStringused a C-style string as an intermediate buffer via theString+= operator. This treats a NUL byte as a terminator, making this function work incorrectly if the File contains binary data.This commit switches the function to use
String::concat, which doesn't treat NUL bytes any differently (and is a bit faster, because it doesn't need to usestrlen).