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authorMax Kellermann <max@duempel.org>2014-01-24 16:18:21 +0100
committerMax Kellermann <max@duempel.org>2014-01-24 16:33:33 +0100
commitf8bfea8bae44134e8002db869fd4ec137d1c0d6e (patch)
treed370391baccbbc4c23306656aec3751a7ffc95ae /src/input/RewindInputPlugin.cxx
parente199c33c6e9eb2f1aa588073f49f44de274985d5 (diff)
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Input*: move to input/
Diffstat (limited to 'src/input/RewindInputPlugin.cxx')
-rw-r--r--src/input/RewindInputPlugin.cxx251
1 files changed, 0 insertions, 251 deletions
diff --git a/src/input/RewindInputPlugin.cxx b/src/input/RewindInputPlugin.cxx
deleted file mode 100644
index 685ca1e6e..000000000
--- a/src/input/RewindInputPlugin.cxx
+++ /dev/null
@@ -1,251 +0,0 @@
-/*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include "config.h"
-#include "RewindInputPlugin.hxx"
-#include "InputStream.hxx"
-#include "InputPlugin.hxx"
-
-#include <assert.h>
-#include <string.h>
-#include <stdio.h>
-
-extern const InputPlugin rewind_input_plugin;
-
-struct RewindInputStream {
- InputStream base;
-
- InputStream *input;
-
- /**
- * The read position within the buffer. Undefined as long as
- * ReadingFromBuffer() returns false.
- */
- size_t head;
-
- /**
- * The write/append position within the buffer.
- */
- size_t tail;
-
- /**
- * The size of this buffer is the maximum number of bytes
- * which can be rewinded cheaply without passing the "seek"
- * call to CURL.
- *
- * The origin of this buffer is always the beginning of the
- * stream (offset 0).
- */
- char buffer[64 * 1024];
-
- RewindInputStream(InputStream *_input)
- :base(rewind_input_plugin, _input->uri.c_str(),
- _input->mutex, _input->cond),
- input(_input), tail(0) {
- }
-
- ~RewindInputStream() {
- input->Close();
- }
-
- /**
- * Are we currently reading from the buffer, and does the
- * buffer contain more data for the next read operation?
- */
- bool ReadingFromBuffer() const {
- return tail > 0 && base.offset < input->offset;
- }
-
- /**
- * Copy public attributes from the underlying input stream to the
- * "rewind" input stream. This function is called when a method of
- * the underlying stream has returned, which may have modified these
- * attributes.
- */
- void CopyAttributes() {
- InputStream *dest = &base;
- const InputStream *src = input;
-
- assert(dest != src);
-
- bool dest_ready = dest->ready;
-
- dest->ready = src->ready;
- dest->seekable = src->seekable;
- dest->size = src->size;
- dest->offset = src->offset;
-
- if (!dest_ready && src->ready)
- dest->mime = src->mime;
- }
-};
-
-static void
-input_rewind_close(InputStream *is)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- delete r;
-}
-
-static bool
-input_rewind_check(InputStream *is, Error &error)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- return r->input->Check(error);
-}
-
-static void
-input_rewind_update(InputStream *is)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- if (!r->ReadingFromBuffer())
- r->CopyAttributes();
-}
-
-static Tag *
-input_rewind_tag(InputStream *is)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- return r->input->ReadTag();
-}
-
-static bool
-input_rewind_available(InputStream *is)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- return r->input->IsAvailable();
-}
-
-static size_t
-input_rewind_read(InputStream *is, void *ptr, size_t size,
- Error &error)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- if (r->ReadingFromBuffer()) {
- /* buffered read */
-
- assert(r->head == (size_t)is->offset);
- assert(r->tail == (size_t)r->input->offset);
-
- if (size > r->tail - r->head)
- size = r->tail - r->head;
-
- memcpy(ptr, r->buffer + r->head, size);
- r->head += size;
- is->offset += size;
-
- return size;
- } else {
- /* pass method call to underlying stream */
-
- size_t nbytes = r->input->Read(ptr, size, error);
-
- if (r->input->offset > (InputPlugin::offset_type)sizeof(r->buffer))
- /* disable buffering */
- r->tail = 0;
- else if (r->tail == (size_t)is->offset) {
- /* append to buffer */
-
- memcpy(r->buffer + r->tail, ptr, nbytes);
- r->tail += nbytes;
-
- assert(r->tail == (size_t)r->input->offset);
- }
-
- r->CopyAttributes();
-
- return nbytes;
- }
-}
-
-static bool
-input_rewind_eof(InputStream *is)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- return !r->ReadingFromBuffer() && r->input->IsEOF();
-}
-
-static bool
-input_rewind_seek(InputStream *is, InputPlugin::offset_type offset,
- int whence,
- Error &error)
-{
- RewindInputStream *r = (RewindInputStream *)is;
-
- assert(is->ready);
-
- if (whence == SEEK_SET && r->tail > 0 &&
- offset <= (InputPlugin::offset_type)r->tail) {
- /* buffered seek */
-
- assert(!r->ReadingFromBuffer() ||
- r->head == (size_t)is->offset);
- assert(r->tail == (size_t)r->input->offset);
-
- r->head = (size_t)offset;
- is->offset = offset;
-
- return true;
- } else {
- bool success = r->input->Seek(offset, whence, error);
- r->CopyAttributes();
-
- /* disable the buffer, because r->input has left the
- buffered range now */
- r->tail = 0;
-
- return success;
- }
-}
-
-const InputPlugin rewind_input_plugin = {
- nullptr,
- nullptr,
- nullptr,
- nullptr,
- input_rewind_close,
- input_rewind_check,
- input_rewind_update,
- input_rewind_tag,
- input_rewind_available,
- input_rewind_read,
- input_rewind_eof,
- input_rewind_seek,
-};
-
-InputStream *
-input_rewind_open(InputStream *is)
-{
- assert(is != nullptr);
- assert(is->offset == 0);
-
- if (is->seekable)
- /* seekable resources don't need this plugin */
- return is;
-
- RewindInputStream *c = new RewindInputStream(is);
- return &c->base;
-}