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feat: pre-messages / next version of download on demand (#7371)

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Closes <https://github.com/chatmail/core/issues/7367>

Co-authored-by: iequidoo <dgreshilov@gmail.com>
Co-authored-by: Hocuri <hocuri@gmx.de>
This commit is contained in:
Simon Laux
2026-01-08 22:14:32 +00:00
committed by GitHub
parent 46bbe5f077
commit 2631745a57
43 changed files with 2843 additions and 1393 deletions
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31
deltachat-ffi/deltachat.h
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@@ -486,12 +486,15 @@ char* dc_get_blobdir (const dc_context_t* context);
* 0=use IMAP IDLE if the server supports it.
* This is a developer option used for testing polling used as an IDLE fallback.
* - `download_limit` = Messages up to this number of bytes are downloaded automatically.
* For larger messages, only the header is downloaded and a placeholder is shown.
* These messages can be downloaded fully using dc_download_full_msg() later.
* The limit is compared against raw message sizes, including headers.
* The actually used limit may be corrected
* to not mess up with non-delivery-reports or read-receipts.
* 0=no limit (default).
* For messages with large attachments, two messages are sent:
* a Pre-Message containing metadata and text and a Post-Message additionally
* containing the attachment. NB: Some "extra" metadata like avatars and gossiped
* encryption keys is stripped from post-messages to save traffic.
* Pre-Messages are shown as placeholder messages. They can be downloaded fully
* using dc_download_full_msg() later. Post-Messages are automatically
* downloaded if they are smaller than the download_limit. Other messages are
* always auto-downloaded.
* 0 = no limit (default).
* Changes affect future messages only.
* - `protect_autocrypt` = Enable Header Protection for Autocrypt header.
* This is an experimental option not compatible to other MUAs
@@ -4346,6 +4349,7 @@ char* dc_msg_get_webxdc_info (const dc_msg_t* msg);
/**
* Get the size of the file. Returns the size of the file associated with a
* message, if applicable.
* If message is a pre-message, then this returns the size of the file to be downloaded.
*
* Typically, this is used to show the size of document files, e.g. a PDF.
*
@@ -7364,22 +7368,9 @@ void dc_event_unref(dc_event_t* event);
/// `%1$s` will be replaced by the percentage used
#define DC_STR_QUOTA_EXCEEDING_MSG_BODY 98
/// "%1$s message"
///
/// Used as the message body when a message
/// was not yet downloaded completely
/// (dc_msg_get_download_state() is e.g. @ref DC_DOWNLOAD_AVAILABLE).
///
/// `%1$s` will be replaced by human-readable size (e.g. "1.2 MiB").
/// @deprecated Deprecated 2025-11-12, this string is no longer needed.
#define DC_STR_PARTIAL_DOWNLOAD_MSG_BODY 99
/// "Download maximum available until %1$s"
///
/// Appended after some separator to @ref DC_STR_PARTIAL_DOWNLOAD_MSG_BODY.
///
/// `%1$s` will be replaced by human-readable date and time.
#define DC_STR_DOWNLOAD_AVAILABILITY 100
/// "Multi Device Synchronization"
///
/// Used in subjects of outgoing sync messages.