FilterInputStream

Base class for input stream implementations that perform some kind of filtering operation on a base stream. Typical examples of filtering operations are character set conversion, compression and byte order flipping.

Constructors

this
this(GFilterInputStream* gFilterInputStream)

Sets our main struct and passes it to the parent class

Members

Functions

getBaseStream
InputStream getBaseStream()

Gets the base stream for the filter stream.

getCloseBaseStream
int getCloseBaseStream()

Returns whether the base stream will be closed when stream is closed.

getFilterInputStreamStruct
GFilterInputStream* getFilterInputStreamStruct()
Undocumented in source. Be warned that the author may not have intended to support it.
getStruct
void* getStruct()

the main Gtk struct as a void*

setCloseBaseStream
void setCloseBaseStream(int closeBase)

Sets whether the base stream will be closed when stream is closed.

setStruct
void setStruct(GObject* obj)
Undocumented in source. Be warned that the author may not have intended to support it.

Variables

gFilterInputStream
GFilterInputStream* gFilterInputStream;

the main Gtk struct

Inherited Members

From InputStream

gInputStream
GInputStream* gInputStream;

the main Gtk struct

getInputStreamStruct
GInputStream* getInputStreamStruct()
Undocumented in source. Be warned that the author may not have intended to support it.
getStruct
void* getStruct()

the main Gtk struct as a void*

setStruct
void setStruct(GObject* obj)
Undocumented in source. Be warned that the author may not have intended to support it.
read
gssize read(void* buffer, gsize count, Cancellable cancellable)

Tries to read count bytes from the stream into the buffer starting at buffer. Will block during this read. If count is zero returns zero and does nothing. A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error. On success, the number of bytes read into the buffer is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file. Zero is returned on end of file (or if count is zero), but never otherwise. If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error. On error -1 is returned and error is set accordingly.

readAll
int readAll(void* buffer, gsize count, gsize bytesRead, Cancellable cancellable)

Tries to read count bytes from the stream into the buffer starting at buffer. Will block during this read. This function is similar to g_input_stream_read(), except it tries to read as many bytes as requested, only stopping on an error or end of stream. On a successful read of count bytes, or if we reached the end of the stream, TRUE is returned, and bytes_read is set to the number of bytes read into buffer. If there is an error during the operation FALSE is returned and error is set to indicate the error status, bytes_read is updated to contain the number of bytes read into buffer before the error occurred.

skip
gssize skip(gsize count, Cancellable cancellable)

Tries to skip count bytes from the stream. Will block during the operation. This is identical to g_input_stream_read(), from a behaviour standpoint, but the bytes that are skipped are not returned to the user. Some streams have an implementation that is more efficient than reading the data. This function is optional for inherited classes, as the default implementation emulates it using read. If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

close
int close(Cancellable cancellable)

Closes the stream, releasing resources related to it. Once the stream is closed, all other operations will return G_IO_ERROR_CLOSED. Closing a stream multiple times will not return an error. Streams will be automatically closed when the last reference is dropped, but you might want to call this function to make sure resources are released as early as possible. Some streams might keep the backing store of the stream (e.g. a file descriptor) open after the stream is closed. See the documentation for the individual stream for details. On failure the first error that happened will be reported, but the close operation will finish as much as possible. A stream that failed to close will still return G_IO_ERROR_CLOSED for all operations. Still, it is important to check and report the error to the user. If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. Cancelling a close will still leave the stream closed, but some streams can use a faster close that doesn't block to e.g. check errors.

readAsync
void readAsync(void* buffer, gsize count, int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)

Request an asynchronous read of count bytes from the stream into the buffer starting at buffer. When the operation is finished callback will be called. You can then call g_input_stream_read_finish() to get the result of the operation. During an async request no other sync and async calls are allowed on stream, and will result in G_IO_ERROR_PENDING errors. A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error. On success, the number of bytes read into the buffer will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file, but generally we try to read as many bytes as requested. Zero is returned on end of file (or if count is zero), but never otherwise. Any outstanding i/o request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT. The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

readFinish
gssize readFinish(AsyncResultIF result)

Finishes an asynchronous stream read operation.

skipAsync
void skipAsync(gsize count, int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)

Request an asynchronous skip of count bytes from the stream. When the operation is finished callback will be called. You can then call g_input_stream_skip_finish() to get the result of the operation. During an async request no other sync and async calls are allowed, and will result in G_IO_ERROR_PENDING errors. A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error. On success, the number of bytes skipped will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file, but generally we try to skip as many bytes as requested. Zero is returned on end of file (or if count is zero), but never otherwise. Any outstanding i/o request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT. The asynchronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one, you must override all.

skipFinish
gssize skipFinish(AsyncResultIF result)

Finishes a stream skip operation.

closeAsync
void closeAsync(int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)

Requests an asynchronous closes of the stream, releasing resources related to it. When the operation is finished callback will be called. You can then call g_input_stream_close_finish() to get the result of the operation. For behaviour details see g_input_stream_close(). The asyncronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

closeFinish
int closeFinish(AsyncResultIF result)

Finishes closing a stream asynchronously, started from g_input_stream_close_async().

isClosed
int isClosed()

Checks if an input stream is closed.

hasPending
int hasPending()

Checks if an input stream has pending actions.

setPending
int setPending()

Sets stream to have actions pending. If the pending flag is already set or stream is closed, it will return FALSE and set error.

clearPending
void clearPending()

Clears the pending flag on stream.

readBytes
Bytes readBytes(gsize count, Cancellable cancellable)

Like g_input_stream_read(), this tries to read count bytes from the stream in a blocking fashion. However, rather than reading into a user-supplied buffer, this will create a new GBytes containing the data that was read. This may be easier to use from language bindings. If count is zero, returns a zero-length GBytes and does nothing. A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error. On success, a new GBytes is returned. It is not an error if the size of this object is not the same as the requested size, as it can happen e.g. near the end of a file. A zero-length GBytes is returned on end of file (or if count is zero), but never otherwise. If cancellable is not NULL, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error G_IO_ERROR_CANCELLED will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error. On error NULL is returned and error is set accordingly.

readBytesAsync
void readBytesAsync(gsize count, int ioPriority, Cancellable cancellable, GAsyncReadyCallback callback, void* userData)

Request an asynchronous read of count bytes from the stream into a new GBytes. When the operation is finished callback will be called. You can then call g_input_stream_read_bytes_finish() to get the result of the operation. During an async request no other sync and async calls are allowed on stream, and will result in G_IO_ERROR_PENDING errors. A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT error. On success, the new GBytes will be passed to the callback. It is not an error if this is smaller than the requested size, as it can happen e.g. near the end of a file, but generally we try to read as many bytes as requested. Zero is returned on end of file (or if count is zero), but never otherwise. Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

readBytesFinish
Bytes readBytesFinish(AsyncResultIF result)

Finishes an asynchronous stream read-into-GBytes operation.

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