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curl_mime_encoder(3) Library Functions Manual curl_mime_encoder(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 be- ing 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 en- coder 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-termi- nated 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 Con- tent-Transfer-Encoding header should be added with curl_mime_headers(3) in- stead 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 discour- aged. PROTOCOLS This functionality affects http, imap and smtp 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 Added in curl 7.56.0 RETURN VALUE This function returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). If CURLOPT_ERRORBUFFER(3) was set with curl_easy_se- topt(3) there can be an error message stored in the error buffer when non-zero is returned. SEE ALSO curl_mime_addpart(3), curl_mime_headers(3), curl_mime_subparts(3) libcurl 2026-06-11 curl_mime_encoder(3)
NAME | SYNOPSIS | DESCRIPTION | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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