## Input from unstructured files

Input from unstructured files —

## Synopsis

                GsfInput;
    guint8const * gsf_input_read                (GsfInput *input,
                                                 size_t num_bytes,
                                                 guint8 *optional_buffer);
    gsf_off_t   gsf_input_tell                  (GsfInput *input);
    gboolean    gsf_input_seek                  (GsfInput *input,
                                                 gsf_off_t offset,
                                                 GSeekType whence);
    GsfInfile*  gsf_input_container             (GsfInput *input);
    GsfInput*   gsf_input_dup                   (GsfInput *input,
                                                 GError **err);
    gsf_off_t   gsf_input_size                  (GsfInput *input);
    gboolean    gsf_input_eof                   (GsfInput *input);
    gsf_off_t   gsf_input_remaining             (GsfInput *input);
    GQuark      gsf_input_error_id              (void);
    GsfInput*   gsf_input_sibling               (GsfInput const *input,
                                                 char const *name,
                                                 GError **err);
    GQuark      gsf_input_error                 (void);
    charconst   * gsf_input_name                (GsfInput *input);
    gboolean    gsf_input_set_name_from_filename
                                                (GsfInput *input,
                                                 char const *filename);
                GsfInputProxy;
    GsfInput*   gsf_input_proxy_new             (GsfInput *source);
    GsfInput*   gsf_input_proxy_new_section     (GsfInput *source,
                                                 gsf_off_t offset,
                                                 gsf_off_t size);

    gboolean    gsf_input_copy                  (GsfInput *input,
                                                 GsfOutput *output);
    GsfInput*   gsf_input_uncompress            (GsfInput *src);

## Object Hierarchy

      GObject
       +----GsfInput
             +----GsfInfile
             +----GsfInputGZip
             +----GsfInputMemory
             +----GsfInputProxy
             +----GsfInputStdio
             +----GsfInputTextline

      GObject
       +----GsfInput
             +----GsfInputProxy

## Properties

      "eof"                  gboolean              : Read
      "name"                 gchararray            : Read
      "position"             gint64                : Read
      "remaining"            gint64                : Read
      "size"                 gint64                : Read

## Description

## Details

### GsfInput

    typedef struct _GsfInput GsfInput;

### gsf_input_read ()

    guint8const * gsf_input_read                (GsfInput *input,
                                                 size_t num_bytes,
                                                 guint8 *optional_buffer);

Read at least `num_bytes`. Does not change the current position if there is an error. Will only read if the entire amount can be read. Invalidates the buffer associated with previous calls to gsf_input_read.

`input` : | the input stream
`num_bytes` : | number of bytes to read
`optional_buffer` : | NULL, or pointer to destination memory area
Returns : | pointer to the buffer or NULL if there is an error or 0 bytes are requested.

### gsf_input_tell ()

    gsf_off_t   gsf_input_tell                  (GsfInput *input);

`input` : | the input stream
Returns : | the current offset in the file.

### gsf_input_seek ()

    gboolean    gsf_input_seek                  (GsfInput *input,
                                                 gsf_off_t offset,
                                                 GSeekType whence);

Move the current location in the input stream.

`input` : | the input stream
`offset` : | target offset
`whence` : | determines whether the offset is relative to the beginning or the end of the stream, or to the current location.
Returns : | TRUE on error.

### gsf_input_container ()

    GsfInfile*  gsf_input_container             (GsfInput *input);

`input` : | the input stream
Returns : | , but does not add a reference to `input`'s container. Potentially NULL

### gsf_input_dup ()

    GsfInput*   gsf_input_dup                   (GsfInput *input,
                                                 GError **err);

Duplicates input `src` leaving the new one at the same offset.

`input` : | The input to duplicate
`err` : | optionally NULL
Returns : | the duplicate, or NULL on error

### gsf_input_size ()

    gsf_off_t   gsf_input_size                  (GsfInput *input);

Looks up and caches the number of bytes in the input

`input` : | The input
Returns : | the size or -1 on error

### gsf_input_eof ()

    gboolean    gsf_input_eof                   (GsfInput *input);

Are we at the end of the file ?

`input` : | the input
Returns : | TRUE if the input is at the eof.

### gsf_input_remaining ()

    gsf_off_t   gsf_input_remaining             (GsfInput *input);

`input` : | the input stream
Returns : | the number of bytes left in the file.

### gsf_input_error_id ()

    GQuark      gsf_input_error_id              (void);

Returns : | A utility quark to flag a GError as being an input problem.

### gsf_input_sibling ()

    GsfInput*   gsf_input_sibling               (GsfInput const *input,
                                                 char const *name,
                                                 GError **err);

`input` : |
`name` : |
`err` : |
Returns : |

### gsf_input_error ()

    GQuark      gsf_input_error                 (void);

Deprecated as of GSF 1.12.0; use `gsf_input_error_id()` instead.

Returns : | A utility quark to flag a GError as being an input problem.

### gsf_input_name ()

    charconst   * gsf_input_name                (GsfInput *input);

The name of the input stream.

`input` : | the input stream
Returns : | `input`'s name in utf8 form, or NULL if it has no name.

### gsf_input_set_name_from_filename ()

    gboolean    gsf_input_set_name_from_filename
                                                (GsfInput *input,
                                                 char const *filename);

protected.

`input` : | the input stream
`filename` : | the (fs-sys encoded) filename
Returns : | TRUE if the assignment was ok.

### GsfInputProxy

    typedef struct _GsfInputProxy GsfInputProxy;

### gsf_input_proxy_new ()

    GsfInput*   gsf_input_proxy_new             (GsfInput *source);

This creates a new proxy to the entire, given input source. See gsf_input_proxy_new_section for details.

`source` : | The underlying data source.
Returns : | a new input object.

### gsf_input_proxy_new_section ()

    GsfInput*   gsf_input_proxy_new_section     (GsfInput *source,
                                                 gsf_off_t offset,
                                                 gsf_off_t size);

This creates a new proxy to a section of the given source. The new object will have its own current position, but any operation on it can change the source's position.

If a proxy to a proxy is created, the intermediate proxy is short- circuited.

This function will ref the source.

`source` : | The underlying data source.
`offset` : | Offset into source for start of section.
`size` : | Length of section.
Returns : | a new input object.

### gsf_input_copy ()

    gboolean    gsf_input_copy                  (GsfInput *input,
                                                 GsfOutput *output);

Copy the contents from `input` to `output` from their respective current positions. So if you want to be sure to copy *everything*, make sure to call gsf_input_seek (input, 0, G_SEEK_SET) and gsf_output_seek (output, 0, G_SEEK_SET) first, if applicable.

`input` : | a non-null GsfInput
`output` : | a non-null GsfOutput
Returns : | TRUE on Success

### gsf_input_uncompress ()

    GsfInput*   gsf_input_uncompress            (GsfInput *src);

`src` : | stream to be uncompressed.
Returns : | A stream equivalent to the source stream, but uncompressed if the source was compressed. This functions takes ownership of the incoming reference and yields a new one as its output.

## Property Details

### The "`eof`" property

      "eof"                  gboolean              : Read

End Of File.

Default value: FALSE

### The "`name`" property

      "name"                 gchararray            : Read

The Input's Name.

Default value: NULL

### The "`position`" property

      "position"             gint64                : Read

The Output's Current Position.

Allowed values: >= 0

Default value: 0

### The "`remaining`" property

      "remaining"            gint64                : Read

Amount of Data Remaining.

Allowed values: >= 0

Default value: 0

### The "`size`" property

      "size"                 gint64                : Read

The Input's Size.

Allowed values: >= 0

Default value: 0