mirror of https://github.com/curl/curl.git synced 2025-01-24 14:15:18 +08:00

Daniel Stenberg eefcc1bda4

docs: introduce "curldown" for libcurl man page format

curldown is this new file format for libcurl man pages. It is markdown
inspired with differences:

- Each file has a set of leading headers with meta-data
- Supports a small subset of markdown
- Uses .md file extensions for editors/IDE/GitHub to treat them nicely
- Generates man pages very similar to the previous ones
- Generates man pages that still convert nicely to HTML on the website
- Detects and highlights mentions of curl symbols automatically (when
  their man page section is specified)

tools:

- cd2nroff: converts from curldown to nroff man page
- nroff2cd: convert an (old) nroff man page to curldown
- cdall: convert many nroff pages to curldown versions
- cd2cd: verifies and updates a curldown to latest curldown

This setup generates .3 versions of all the curldown versions at build time.

CI:

Since the documentation is now technically markdown in the eyes of many
things, the CI runs many more tests and checks on this documentation,
including proselint, link checkers and tests that make sure we capitalize the
first letter after a period...

Closes #12730

2024-01-23 00:29:02 +01:00

2.7 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

curl

curl_mime_encoder

libcurl

curl_mime_addpart (3)

curl_mime_headers (3)

curl_mime_subparts (3)

NAME

curl_mime_encoder - set a mime part's encoder and content transfer encoding

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_mime_encoder(curl_mimepart *part, const char *encoding);

DESCRIPTION

curl_mime_encoder() requests a mime part's content to be encoded before being transmitted.

part is the part's handle to assign an encoder. encoding is a pointer to a null-terminated encoding scheme. It may be set to NULL to disable an encoder previously attached to the part. The encoding scheme storage may safely be reused after this function returns.

Setting a part's encoder multiple times is valid: only the value set by the last call is retained.

Upon multipart rendering, the part's content is encoded according to the pertaining scheme and a corresponding "Content-Transfer-Encoding" header is added to the part.

Supported encoding schemes are:

"binary": the data is left unchanged, the header is added.

"8bit": header added, no data change.

"7bit": the data is unchanged, but is each byte is checked to be a 7-bit value; if not, a read error occurs.

"base64": Data is converted to base64 encoding, then split in CRLF-terminated lines of at most 76 characters.

"quoted-printable": data is encoded in quoted printable lines of at most 76 characters. Since the resulting size of the final data cannot be determined prior to reading the original data, it is left as unknown, causing chunked transfer in HTTP. For the same reason, this encoder may not be used with IMAP. This encoder targets text data that is mostly ASCII and should not be used with other types of data.

If the original data is already encoded in such a scheme, a custom Content-Transfer-Encoding header should be added with curl_mime_headers(3) instead of setting a part encoder.

Encoding should not be applied to multiparts, thus the use of this function on a part with content set with curl_mime_subparts(3) is strongly discouraged.

EXAMPLE

int main(void)
{
  curl_mime *mime;
  curl_mimepart *part;

  CURL *curl = curl_easy_init();
  if(curl) {
    /* create a mime handle */
    mime = curl_mime_init(curl);

    /* add a part */
    part = curl_mime_addpart(mime);

    /* send a file */
    curl_mime_filedata(part, "image.png");

    /* encode file data in base64 for transfer */
    curl_mime_encoder(part, "base64");
  }
}

AVAILABILITY

As long as at least one of HTTP, SMTP or IMAP is enabled. Added in 7.56.0.

RETURN VALUE

CURLE_OK or a CURL error code upon failure.

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