CamelMimeParser: Camel Reference Manual

## CamelMimeParser CamelMimeParser |

## Functions

CamelMimeParser * | camel_mime_parser_new ()
gint | camel_mime_parser_errno ()
gint | camel_mime_parser_init_with_fd ()
gint | camel_mime_parser_init_with_stream ()
void | camel_mime_parser_init_with_input_stream ()
void | camel_mime_parser_init_with_bytes ()
CamelStream * | camel_mime_parser_stream ()
void | camel_mime_parser_scan_from ()
void | camel_mime_parser_scan_pre_from ()
gint | camel_mime_parser_set_header_regex ()
camel_mime_parser_state_t | camel_mime_parser_step ()
void | camel_mime_parser_unstep ()
void | camel_mime_parser_drop_step ()
camel_mime_parser_state_t | camel_mime_parser_state ()
void | camel_mime_parser_push_state ()
gssize | camel_mime_parser_read ()
CamelContentType * | camel_mime_parser_content_type ()
const gchar * | camel_mime_parser_header ()
struct _camel_header_raw * | camel_mime_parser_headers_raw ()
const gchar * | camel_mime_parser_preface ()
const gchar * | camel_mime_parser_postface ()
const gchar * | camel_mime_parser_from_line ()
gint | camel_mime_parser_filter_add ()
void | camel_mime_parser_filter_remove ()
goffset | camel_mime_parser_tell ()
goffset | camel_mime_parser_seek ()
goffset | camel_mime_parser_tell_start_headers ()
goffset | camel_mime_parser_tell_start_from ()
goffset | camel_mime_parser_tell_start_boundary ()

## Types and Values

struct | CamelMimeParser
enum | camel_mime_parser_state_t

## Object Hierarchy

        GObject
        ╰── CamelMimeParser

## Description

## Functions

### camel_mime_parser_new ()

    CamelMimeParser *
    camel_mime_parser_new (void);

Create a new CamelMimeParser object.

#### Returns

A new CamelMimeParser widget.

### camel_mime_parser_errno ()

    gint
    camel_mime_parser_errno (CamelMimeParser *parser);

### camel_mime_parser_init_with_fd ()

    gint
    camel_mime_parser_init_with_fd (CamelMimeParser *m,
                                    gint fd);

Initialise the scanner with an fd. The scanner's offsets will be relative to the current file position of the file descriptor. As a result, seekable descritors should be seeked using the parser seek functions.

#### Parameters

fd | A valid file descriptor. |

#### Returns

Returns -1 on error.

### camel_mime_parser_init_with_stream ()

    gint
    camel_mime_parser_init_with_stream (CamelMimeParser *m,
                                        CamelStream *stream,
                                        GError **error);

Initialise the scanner with a source stream. The scanner's offsets will be relative to the current file position of the stream. As a result, seekable streams should only be seeked using the parser seek function.

#### Parameters

error | return location for a GError, or `NULL` |

#### Returns

-1 on error.

### camel_mime_parser_init_with_input_stream ()

    void
    camel_mime_parser_init_with_input_stream
                                   (CamelMimeParser *parser,
                                    GInputStream *input_stream);

Initialize the scanner with `input_stream` . The scanner's offsets will be relative to the current file position of the stream. As a result, seekable streams should only be seeked using the parser seek function.

#### Parameters

parser | a CamelMimeParser |
input_stream | a GInputStream |

Since: 3.12

### camel_mime_parser_init_with_bytes ()

    void
    camel_mime_parser_init_with_bytes (CamelMimeParser *parser,
                                       GBytes *bytes);

Convenience function creates a GMemoryInputStream from `bytes` and hands it off to `camel_mime_parser_init_with_input_stream()`.

#### Parameters

parser | a CamelMimeParser |
bytes | a GBytes containing the message content |

Since: 3.12

### camel_mime_parser_stream ()

    CamelStream *
    camel_mime_parser_stream (CamelMimeParser *parser);

Get the stream, if any, the parser has been initialised with. May be used to setup sub-streams, but should not be read from directly (without saving and restoring the seek position in between).

#### Parameters

parser | MIME parser object |

#### Returns

The stream from `_init_with_stream()`, or NULL if the parser is reading from a file descriptor or is uninitialised.

[transfer none][nullable]

### camel_mime_parser_scan_from ()

    void
    camel_mime_parser_scan_from (CamelMimeParser *parser,
                                 gboolean scan_from);

Tell the scanner if it should scan "^From " lines or not.

If the scanner is scanning from lines, two additional states CAMEL_MIME_PARSER_STATE_FROM and CAMEL_MIME_PARSER_STATE_FROM_END will be returned to the caller during parsing.

This may also be preceeded by an optional CAMEL_MIME_PARSER_STATE_PRE_FROM state which contains the scanned data found before the From line is encountered. See also `scan_pre_from()`.

#### Parameters

parser | MIME parser object |
scan_from | `TRUE` if the scanner should scan From lines. |

### camel_mime_parser_scan_pre_from ()

    void
    camel_mime_parser_scan_pre_from (CamelMimeParser *parser,
                                     gboolean scan_pre_from);

Tell the scanner whether we want to know abou the pre-from data during a scan. If we do, then we may get an additional state CAMEL_MIME_PARSER_STATE_PRE_FROM which returns the specified data.

#### Parameters

parser | MIME parser object |
scan_pre_from | `TRUE` if we want to get pre-from data. |

### camel_mime_parser_set_header_regex ()

    gint
    camel_mime_parser_set_header_regex (CamelMimeParser *parser,
                                        gchar *matchstr);

### camel_mime_parser_step ()

    camel_mime_parser_state_t
    camel_mime_parser_step (CamelMimeParser *parser,
                            gchar **databuffer,
                            gsize *datalength);

Parse the next part of the MIME message. If `_unstep()` has been called, then continue to return the same state for that many calls.

If the step is CAMEL_MIME_PARSER_STATE_BODY then the databuffer and datalength pointers will be setup to point to the internal data buffer of the scanner and may be processed as required. Any filters will have already been applied to this data.

Refer to the state diagram elsewhere for a full listing of the states an application is gauranteed to get from the scanner.

#### Parameters

parser | MIME parser object |
databuffer | Pointer to accept a pointer to the data associated with this step (if any). May be `NULL`, in which case datalength is also ingored. |
datalength | Pointer to accept a pointer to the data length associated with this step (if any). |

#### Returns

The current new state of the parser is returned.

### camel_mime_parser_unstep ()

    void
    camel_mime_parser_unstep (CamelMimeParser *parser);

Cause the last step operation to repeat itself. If this is called repeated times, then the same step will be repeated that many times.

Note that it is not possible to scan back using this function, only to have a way of peeking the next state.

#### Parameters

parser | MIME parser object |

### camel_mime_parser_drop_step ()

    void
    camel_mime_parser_drop_step (CamelMimeParser *parser);

Drop the last step call. This should only be used in conjunction with seeking of the stream as the stream may be in an undefined state relative to the state of the parser.

Use this call with care.

#### Parameters

parser | MIME parser object |

### camel_mime_parser_state ()

    camel_mime_parser_state_t
    camel_mime_parser_state (CamelMimeParser *parser);

Get the current parser state.

#### Parameters

parser | MIME parser object |

#### Returns

The current parser state.

### camel_mime_parser_push_state ()

    void
    camel_mime_parser_push_state (CamelMimeParser *mp,
                                  camel_mime_parser_state_t newstate,
                                  const gchar *boundary);

Pre-load a new parser state. Used to post-parse multipart content without headers.

#### Parameters

mp | MIME parser object |
newstate | New state |
boundary | Boundary marker for state. |

### camel_mime_parser_read ()

    gssize
    camel_mime_parser_read (CamelMimeParser *parser,
                            const gchar **databuffer,
                            gssize len,
                            GError **error);

Read at most `len` bytes from the internal mime parser buffer.

Returns the address of the internal buffer in `databuffer` , and the length of useful data.

`len` may be specified as `G_MAXSSIZE`, in which case you will get the full remainder of the buffer at each call.

Note that no parsing of the data read through this function occurs, so no state changes occur, but the seek position is updated appropriately.

#### Parameters

parser | MIME parser object |
error | return location for a GError, or `NULL` |

#### Returns

The number of bytes available, or -1 on error.

### camel_mime_parser_content_type ()

    CamelContentType *
    camel_mime_parser_content_type (CamelMimeParser *parser);

Get the content type defined in the current part.

#### Parameters

parser | MIME parser object |

#### Returns

A content_type structure, or NULL if there is no content-type defined for this part of state of the parser.

### camel_mime_parser_header ()

    const gchar *
    camel_mime_parser_header (CamelMimeParser *m,
                              const gchar *name,
                              gint *offset);

Lookup a header by name.

#### Parameters

name | Name of header. |
offset | Pointer that can receive the offset of the header in the stream from the start of parsing. |

#### Returns

The header value, or NULL if the header is not defined.

### camel_mime_parser_headers_raw ()

    struct _camel_header_raw *
    camel_mime_parser_headers_raw (CamelMimeParser *m);

Get the list of the raw headers which are defined for the current state of the parser. These headers are valid until the next call to `parser_step()`, or `parser_drop_step()`.

#### Returns

The raw headers, or NULL if there are no headers defined for the current part or state. These are READ ONLY.

[transfer none]

Since: 2.22

### camel_mime_parser_preface ()

    const gchar *
    camel_mime_parser_preface (CamelMimeParser *m);

Retrieve the preface text for the current multipart. Can only be used when the state is CAMEL_MIME_PARSER_STATE_MULTIPART_END.

#### Returns

The preface text, or NULL if there wasn't any.

Since: 2.22

### camel_mime_parser_postface ()

    const gchar *
    camel_mime_parser_postface (CamelMimeParser *m);

Retrieve the postface text for the current multipart. Only returns valid data when the current state if CAMEL_MIME_PARSER_STATE_MULTIPART_END.

#### Returns

The postface text, or NULL if there wasn't any.

Since: 2.22

### camel_mime_parser_from_line ()

    const gchar *
    camel_mime_parser_from_line (CamelMimeParser *m);

Get the last scanned "From " line, from a recently scanned from. This should only be called in the CAMEL_MIME_PARSER_STATE_FROM state. The from line will include the closing \n found (if there was one).

The return value will remain valid while in the CAMEL_MIME_PARSER_STATE_FROM state, or any deeper state.

#### Returns

The From line, or NULL if called out of context.

Since: 2.22

### camel_mime_parser_filter_add ()

    gint
    camel_mime_parser_filter_add (CamelMimeParser *m,
                                  CamelMimeFilter *mf);

Add a filter that will be applied to any body content before it is passed to the caller. Filters may be pipelined to perform multi-pass operations on the content, and are applied in the order they were added.

Note that filters are only applied to the body content of messages, and once a filter has been set, all content returned by a `filter_step()` with a state of CAMEL_MIME_PARSER_STATE_BODY will have passed through the filter.

#### Returns

An id that may be passed to `filter_remove()` to remove the filter, or -1 if the operation failed.

Since: 2.22

### camel_mime_parser_filter_remove ()

    void
    camel_mime_parser_filter_remove (CamelMimeParser *m,
                                     gint id);

Remove a processing filter from the pipeline. There is no restriction on the order the filters can be removed.

Since: 2.22

### camel_mime_parser_tell ()

    goffset
    camel_mime_parser_tell (CamelMimeParser *parser);

Return the current scanning offset. The meaning of this value will depend on the current state of the parser.

An incomplete listing of the states:

CAMEL_MIME_PARSER_STATE_INITIAL, The start of the current message. CAMEL_MIME_PARSER_STATE_HEADER, CAMEL_MIME_PARSER_STATE_MESSAGE, CAMEL_MIME_PARSER_STATE_MULTIPART, the character position immediately after the end of the header. CAMEL_MIME_PARSER_STATE_BODY, Position within the message of the start of the current data block. CAMEL_MIME_PARSER_STATE_*_END, The position of the character starting the next section of the scan (the last position + 1 of the respective current state).

#### Parameters

parser | MIME parser object |

#### Returns

See above.

Since: 2.22

### camel_mime_parser_seek ()

    goffset
    camel_mime_parser_seek (CamelMimeParser *parser,
                            goffset offset,
                            gint whence);

Reset the source position to a known value.

Note that if the source stream/descriptor was not positioned at 0 to begin with, and an absolute seek is specified (whence != SEEK_CUR), then the seek position may not match the desired seek position.

#### Parameters

parser | MIME parser object |
offset | Number of bytes to offset the seek by. |
whence | SEEK_SET, SEEK_CUR, SEEK_END |

#### Returns

The new seek offset, or -1 on an error (for example, trying to seek on a non-seekable stream or file descriptor).

Since: 2.22

### camel_mime_parser_tell_start_headers ()

    goffset
    camel_mime_parser_tell_start_headers (CamelMimeParser *parser);

Find out the position within the file of where the headers started, this is cached by the parser at the time.

#### Parameters

parser | MIME parser object |

#### Returns

The header start position, or -1 if no headers were scanned in the current state.

Since: 2.22

### camel_mime_parser_tell_start_from ()

    goffset
    camel_mime_parser_tell_start_from (CamelMimeParser *parser);

If the parser is scanning From lines, then this returns the position of the start of the From line.

#### Parameters

parser | MIME parser object |

#### Returns

The start of the from line, or -1 if there was no From line, or From lines are not being scanned.

Since: 2.22

### camel_mime_parser_tell_start_boundary ()

    goffset
    camel_mime_parser_tell_start_boundary (CamelMimeParser *parser);

When parsing a multipart, this returns the start of the last boundary.

#### Parameters

parser | MIME parser object |

#### Returns

The start of the boundary, or -1 if there was no boundary encountered yet.

Since: 2.22

## Types and Values

### struct CamelMimeParser

    struct CamelMimeParser;

### enum camel_mime_parser_state_t

#### Members

CAMEL_MIME_PARSER_STATE_INITIAL |  |
CAMEL_MIME_PARSER_STATE_PRE_FROM |  |
CAMEL_MIME_PARSER_STATE_FROM |  |
CAMEL_MIME_PARSER_STATE_HEADER |  |
CAMEL_MIME_PARSER_STATE_BODY |  |
CAMEL_MIME_PARSER_STATE_MULTIPART |  |
CAMEL_MIME_PARSER_STATE_MESSAGE |  |
CAMEL_MIME_PARSER_STATE_PART |  |
CAMEL_MIME_PARSER_STATE_END |  |
CAMEL_MIME_PARSER_STATE_EOF |  |
CAMEL_MIME_PARSER_STATE_PRE_FROM_END |  |
CAMEL_MIME_PARSER_STATE_FROM_END |  |
CAMEL_MIME_PARSER_STATE_HEADER_END |  |
CAMEL_MIME_PARSER_STATE_BODY_END |  |
CAMEL_MIME_PARSER_STATE_MULTIPART_END |  |
CAMEL_MIME_PARSER_STATE_MESSAGE_END |  |