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-rw-r--r--src/input/plugins/RewindInputPlugin.cxx135
1 files changed, 89 insertions, 46 deletions
diff --git a/src/input/plugins/RewindInputPlugin.cxx b/src/input/plugins/RewindInputPlugin.cxx
index 1cc146d3f..d8ef62021 100644
--- a/src/input/plugins/RewindInputPlugin.cxx
+++ b/src/input/plugins/RewindInputPlugin.cxx
@@ -28,7 +28,7 @@
extern const InputPlugin rewind_input_plugin;
-struct RewindInputStream {
+class RewindInputStream {
InputStream base;
InputStream *input;
@@ -54,6 +54,7 @@ struct RewindInputStream {
*/
char buffer[64 * 1024];
+public:
RewindInputStream(InputStream *_input)
:base(rewind_input_plugin, _input->GetURI(),
_input->mutex, _input->cond),
@@ -64,6 +65,36 @@ struct RewindInputStream {
input->Close();
}
+ InputStream *GetBase() {
+ return &base;
+ }
+
+ bool Check(Error &error) {
+ return input->Check(error);
+ }
+
+ void Update() {
+ if (!ReadingFromBuffer())
+ CopyAttributes();
+ }
+
+ Tag *ReadTag() {
+ return input->ReadTag();
+ }
+
+ bool IsAvailable() {
+ return input->IsAvailable();
+ }
+
+ size_t Read(void *ptr, size_t size, Error &error);
+
+ bool IsEOF() {
+ return !ReadingFromBuffer() && input->IsEOF();
+ }
+
+ bool Seek(InputPlugin::offset_type offset, int whence, Error &error);
+
+private:
/**
* Are we currently reading from the buffer, and does the
* buffer contain more data for the next read operation?
@@ -110,7 +141,7 @@ input_rewind_check(InputStream *is, Error &error)
{
RewindInputStream *r = (RewindInputStream *)is;
- return r->input->Check(error);
+ return r->Check(error);
}
static void
@@ -118,8 +149,7 @@ input_rewind_update(InputStream *is)
{
RewindInputStream *r = (RewindInputStream *)is;
- if (!r->ReadingFromBuffer())
- r->CopyAttributes();
+ r->Update();
}
static Tag *
@@ -127,7 +157,7 @@ input_rewind_tag(InputStream *is)
{
RewindInputStream *r = (RewindInputStream *)is;
- return r->input->ReadTag();
+ return r->ReadTag();
}
static bool
@@ -135,93 +165,106 @@ input_rewind_available(InputStream *is)
{
RewindInputStream *r = (RewindInputStream *)is;
- return r->input->IsAvailable();
+ return r->IsAvailable();
}
-static size_t
-input_rewind_read(InputStream *is, void *ptr, size_t size,
- Error &error)
+inline size_t
+RewindInputStream::Read(void *ptr, size_t size, Error &error)
{
- RewindInputStream *r = (RewindInputStream *)is;
-
- if (r->ReadingFromBuffer()) {
+ if (ReadingFromBuffer()) {
/* buffered read */
- assert(r->head == (size_t)is->offset);
- assert(r->tail == (size_t)r->input->offset);
+ assert(head == (size_t)base.offset);
+ assert(tail == (size_t)input->offset);
- if (size > r->tail - r->head)
- size = r->tail - r->head;
+ if (size > tail - head)
+ size = tail - head;
- memcpy(ptr, r->buffer + r->head, size);
- r->head += size;
- is->offset += size;
+ memcpy(ptr, buffer + head, size);
+ head += size;
+ base.offset += size;
return size;
} else {
/* pass method call to underlying stream */
- size_t nbytes = r->input->Read(ptr, size, error);
+ size_t nbytes = input->Read(ptr, size, error);
- if (r->input->offset > (InputPlugin::offset_type)sizeof(r->buffer))
+ if (input->offset > (InputPlugin::offset_type)sizeof(buffer))
/* disable buffering */
- r->tail = 0;
- else if (r->tail == (size_t)is->offset) {
+ tail = 0;
+ else if (tail == (size_t)base.offset) {
/* append to buffer */
- memcpy(r->buffer + r->tail, ptr, nbytes);
- r->tail += nbytes;
+ memcpy(buffer + tail, ptr, nbytes);
+ tail += nbytes;
- assert(r->tail == (size_t)r->input->offset);
+ assert(tail == (size_t)input->offset);
}
- r->CopyAttributes();
+ CopyAttributes();
return nbytes;
}
}
-static bool
-input_rewind_eof(InputStream *is)
+static size_t
+input_rewind_read(InputStream *is, void *ptr, size_t size,
+ Error &error)
{
RewindInputStream *r = (RewindInputStream *)is;
- return !r->ReadingFromBuffer() && r->input->IsEOF();
+ return r->Read(ptr, size, error);
}
static bool
-input_rewind_seek(InputStream *is, InputPlugin::offset_type offset,
- int whence,
- Error &error)
+input_rewind_eof(InputStream *is)
{
RewindInputStream *r = (RewindInputStream *)is;
- assert(is->IsReady());
+ return r->IsEOF();
+}
+
+inline bool
+RewindInputStream::Seek(InputPlugin::offset_type offset, int whence,
+ Error &error)
+{
+ assert(base.IsReady());
- if (whence == SEEK_SET && r->tail > 0 &&
- offset <= (InputPlugin::offset_type)r->tail) {
+ if (whence == SEEK_SET && tail > 0 &&
+ offset <= (InputPlugin::offset_type)tail) {
/* buffered seek */
- assert(!r->ReadingFromBuffer() ||
- r->head == (size_t)is->offset);
- assert(r->tail == (size_t)r->input->offset);
+ assert(!ReadingFromBuffer() ||
+ head == (size_t)base.offset);
+ assert(tail == (size_t)input->offset);
- r->head = (size_t)offset;
- is->offset = offset;
+ head = (size_t)offset;
+ base.offset = offset;
return true;
} else {
- bool success = r->input->Seek(offset, whence, error);
- r->CopyAttributes();
+ bool success = input->Seek(offset, whence, error);
+ CopyAttributes();
- /* disable the buffer, because r->input has left the
+ /* disable the buffer, because input has left the
buffered range now */
- r->tail = 0;
+ tail = 0;
return success;
}
}
+static bool
+input_rewind_seek(InputStream *is, InputPlugin::offset_type offset,
+ int whence,
+ Error &error)
+{
+ RewindInputStream *r = (RewindInputStream *)is;
+
+ return r->Seek(offset, whence, error);
+}
+
const InputPlugin rewind_input_plugin = {
nullptr,
nullptr,
@@ -248,5 +291,5 @@ input_rewind_open(InputStream *is)
return is;
RewindInputStream *c = new RewindInputStream(is);
- return &c->base;
+ return c->GetBase();
}