pub struct FileNvm { /* fields omitted */ }
ファイルベースのNonVolatileMemory
の実装.
現状の実装ではブロックサイズはBlockSize::min()
に固定.
UNIX環境であれば、ファイルはO_DIRECT
フラグ付きでオープンされる.
O_DIRECT
とO_SYNC/O_DSYNC
に関して:
デフォルト設定で新しいFileNvm
インスタンスを生成する.
デフォルト設定では、O_DIRECT (MacではF_NOCACHE)でのバッファリングなしI/Oを行い
ファイルアクセスに対する排他制御を行う。
filepath
が既に存在する場合にはそれを開き、存在しない場合には新規にファイルを作成する.
返り値のタプルの二番目の値は、ファイルが新規作成されたかどうか (true
なら新規作成).
デフォルト設定でファイルを新規に作成してFileNvm
インスタンスを生成する.
デフォルト設定では、O_DIRECT (MacではF_NOCACHE)でのバッファリングなしI/Oを行い
ファイルアクセスに対する排他制御を行う。
デフォルト設定で既存のファイルを開きFileNvm
インスタンスを生成する。
デフォルト設定では、O_DIRECT (MacではF_NOCACHE)でのバッファリングなしI/Oを行い
ファイルアクセスに対する排他制御を行う。
ここでいう既存のファイルとは、以前に Storage::create
等で
作成済みのlusfファイルを指す。
lusfファイルにはcapacity情報が埋め込まれているので
createとは異なりcapacity引数を要求しない。
SeekFrom
形式で指定された位置を、開始地点からのオフセットに変換する. Read more
このインスタンスが指定するブロック境界へのアライメントを保証した書き込みを行う. Read more
このインスタンスが指定するブロック境界へのアライメントを保証した上で、指定サイズ分のバイト列を読み込む.
Formats the value using the given formatter. Read more
Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more
🔬 This is a nightly-only experimental API. (read_initializer
)
Determines if this Read
er can work with buffers of uninitialized memory. Read more
Read all bytes until EOF in this source, placing them into buf
. Read more
Read all bytes until EOF in this source, appending them to buf
. Read more
Read the exact number of bytes required to fill buf
. Read more
Creates a "by reference" adaptor for this instance of Read
. Read more
Transforms this Read
instance to an [Iterator
] over its bytes. Read more
Creates an adaptor which will chain this stream with another. Read more
Creates an adaptor which will read at most limit
bytes from it. Read more
Write a buffer into this writer, returning how many bytes were written. Read more
Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
Attempts to write an entire buffer into this writer. Read more
Writes a formatted string into this writer, returning any error encountered. Read more
Creates a "by reference" adaptor for this instance of Write
. Read more
Seek to an offset, in bytes, in a stream. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static
Reads an unsigned 8 bit integer from the underlying reader. Read more
Reads a signed 8 bit integer from the underlying reader. Read more
Reads an unsigned 16 bit integer from the underlying reader. Read more
Reads a signed 16 bit integer from the underlying reader. Read more
Reads an unsigned 24 bit integer from the underlying reader. Read more
Reads a signed 24 bit integer from the underlying reader. Read more
Reads an unsigned 32 bit integer from the underlying reader. Read more
Reads a signed 32 bit integer from the underlying reader. Read more
Reads an unsigned 48 bit integer from the underlying reader. Read more
Reads a signed 48 bit integer from the underlying reader. Read more
Reads an unsigned 64 bit integer from the underlying reader. Read more
Reads a signed 64 bit integer from the underlying reader. Read more
Reads an unsigned 128 bit integer from the underlying reader. Read more
Reads a signed 128 bit integer from the underlying reader. Read more
Reads an unsigned n-bytes integer from the underlying reader. Read more
Reads a signed n-bytes integer from the underlying reader. Read more
Reads an unsigned n-bytes integer from the underlying reader.
Reads a signed n-bytes integer from the underlying reader.
Reads a IEEE754 single-precision (4 bytes) floating point number from the underlying reader. Read more
Reads a IEEE754 double-precision (8 bytes) floating point number from the underlying reader. Read more
Reads a sequence of unsigned 16 bit integers from the underlying reader. Read more
Reads a sequence of unsigned 32 bit integers from the underlying reader. Read more
Reads a sequence of unsigned 64 bit integers from the underlying reader. Read more
Reads a sequence of unsigned 128 bit integers from the underlying reader. Read more
Reads a sequence of signed 16 bit integers from the underlying reader. Read more
Reads a sequence of signed 32 bit integers from the underlying reader. Read more
Reads a sequence of signed 64 bit integers from the underlying reader. Read more
Reads a sequence of signed 128 bit integers from the underlying reader. Read more
Reads a sequence of IEEE754 single-precision (4 bytes) floating point numbers from the underlying reader. Read more
Deprecated since 1.2.0:
please use read_f32_into
instead
Reads a sequence of IEEE754 double-precision (8 bytes) floating point numbers from the underlying reader. Read more
Deprecated since 1.2.0:
please use read_f64_into
instead
Writes an unsigned 8 bit integer to the underlying writer. Read more
Writes a signed 8 bit integer to the underlying writer. Read more
Writes an unsigned 16 bit integer to the underlying writer. Read more
Writes a signed 16 bit integer to the underlying writer. Read more
Writes an unsigned 24 bit integer to the underlying writer. Read more
Writes a signed 24 bit integer to the underlying writer. Read more
Writes an unsigned 32 bit integer to the underlying writer. Read more
Writes a signed 32 bit integer to the underlying writer. Read more
Writes an unsigned 48 bit integer to the underlying writer. Read more
Writes a signed 48 bit integer to the underlying writer. Read more
Writes an unsigned 64 bit integer to the underlying writer. Read more
Writes a signed 64 bit integer to the underlying writer. Read more
Writes an unsigned 128 bit integer to the underlying writer.
Writes a signed 128 bit integer to the underlying writer.
Writes an unsigned n-bytes integer to the underlying writer. Read more
Writes a signed n-bytes integer to the underlying writer. Read more
Writes an unsigned n-bytes integer to the underlying writer. Read more
Writes a signed n-bytes integer to the underlying writer. Read more
Writes a IEEE754 single-precision (4 bytes) floating point number to the underlying writer. Read more
Writes a IEEE754 double-precision (8 bytes) floating point number to the underlying writer. Read more