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// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright The Music Player Daemon Project
#include "ReadFrames.hxx"
#include "system/Error.hxx"
#include "io/FileDescriptor.hxx"
static size_t
ReadOrThrow(FileDescriptor fd, std::span<std::byte> dest)
{
auto nbytes = fd.Read(dest);
if (nbytes < 0)
throw MakeErrno("Read failed");
return nbytes;
}
std::size_t
ReadFrames(FileDescriptor fd, void *_buffer, std::size_t size,
std::size_t frame_size)
{
auto buffer = (std::byte *)_buffer;
size = (size / frame_size) * frame_size;
size_t nbytes = ReadOrThrow(fd, {buffer, size});
const size_t modulo = nbytes % frame_size;
if (modulo > 0) {
size_t rest = frame_size - modulo;
fd.FullRead({(std::byte *)buffer + nbytes, rest});
nbytes += rest;
}
return nbytes;
}
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