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La funci\u00f3n stbi__getn lee una cantidad espec\u00edfica de bytes del contexto (normalmente un archivo) en el b\u00fafer especificado. En caso de que la secuencia del archivo apunte al final, devuelve cero. Hay dos lugares donde no se verifica su valor de retorno: en la funci\u00f3n `stbi__hdr_load` y en la funci\u00f3n `stbi__tga_load`. 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