std.outbuffer

class OutBuffer;

OutBuffer provides a way to build up an array of bytes out of raw data. It is useful for things like preparing an array of bytes to write out to a file. OutBuffer's byte order is the format native to the computer. To control the byte order (endianness), use a class derived from OutBuffer. OutBuffer's internal buffer is allocated with the GC. Pointers stored into the buffer are scanned by the GC, but you have to ensure proper alignment, e.g. by using alignSize((void*).sizeof).

Examples:

import std.string : cmp;

OutBuffer buf = new OutBuffer();

writeln(buf.offset); // 0
buf.write("hello");
buf.write(cast(byte) 0x20);
buf.write("world");
buf.printf(" %d", 62665);
writeln(cmp(buf.toString(), "hello world 62665")); // 0

buf.clear();
writeln(cmp(buf.toString(), "")); // 0
buf.write("New data");
writeln(cmp(buf.toString(), "New data")); // 0

pure nothrow @safe ubyte[] toBytes();

Convert to array of bytes.

pure nothrow @trusted void reserve(size_t nbytes);

Preallocate nbytes more to the size of the internal buffer.

This is a speed optimization, a good guess at the maximum size of the resulting buffer will improve performance by eliminating reallocations and copying.

alias put = write;

put enables OutBuffer to be used as an OutputRange.

pure nothrow @safe void write(const(ubyte)[] bytes);

pure nothrow @safe void write(byte b);

pure nothrow @safe void write(char c);

pure nothrow @safe void write(dchar c);

pure nothrow @safe void write(short s);

pure nothrow @safe void write(int i);

pure nothrow @safe void write(long l);

Append data to the internal buffer.

pure nothrow @safe void fill0(size_t nbytes);

Append nbytes of 0 to the internal buffer.

pure nothrow @safe void alignSize(size_t alignsize);

0-fill to align on power of 2 boundary.

pure nothrow @safe void clear();

Clear the data in the buffer

pure nothrow @safe void align2();

Optimize common special case alignSize(2)

pure nothrow @safe void align4();

Optimize common special case alignSize(4)

const pure nothrow @safe string toString();

Convert internal buffer to array of chars.

nothrow @trusted void vprintf(string format, va_list args);

Append output of C's vprintf() to internal buffer.

@trusted void printf(string format, ...);

Append output of C's printf() to internal buffer.

void writef(Char, A...)(in Char[] fmt, A args);

Formats and writes its arguments in text format to the OutBuffer.

Parameters:

Char[] fmt	format string as described in std.format.formattedWrite
A args	arguments to be formatted

See Also:

std.stdio.writef; std.format.formattedWrite;

Examples:

OutBuffer b = new OutBuffer();
b.writef("a%sb", 16);
writeln(b.toString()); // "a16b"

void writefln(Char, A...)(in Char[] fmt, A args);

Formats and writes its arguments in text format to the OutBuffer, followed by a newline.

Parameters:

Char[] fmt	format string as described in std.format.formattedWrite
A args	arguments to be formatted

See Also:

std.stdio.writefln; std.format.formattedWrite;

Examples:

OutBuffer b = new OutBuffer();
b.writefln("a%sb", 16);
writeln(b.toString()); // "a16b\n"

pure nothrow @safe void spread(size_t index, size_t nbytes);

At offset index into buffer, create nbytes of space by shifting upwards all data past index.