mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00
127e53cf98
lws has been able to generate client multipart mime as shown in minimal-http-client-post, but it requires a lot of user boilerplate to handle the boundary, related transaction header, and multipart headers. This patch adds a client creation flag to indicate it will carry multipart mime, which autocreates the boundary string and applies the transaction header with it, and an api to form the boundary headers between the different mime parts and the terminating boundary.
275 lines
7 KiB
C
275 lines
7 KiB
C
/*
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* This code originally came from here
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*
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* http://base64.sourceforge.net/b64.c
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*
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* already with MIT license, which is retained.
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*
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* LICENCE: Copyright (c) 2001 Bob Trower, Trantor Standard Systems Inc.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated
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* documentation files (the "Software"), to deal in the
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* Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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* KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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* PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
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* OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* VERSION HISTORY:
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* Bob Trower 08/04/01 -- Create Version 0.00.00B
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*
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* I cleaned it up quite a bit to match the (linux kernel) style of the rest
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* of libwebsockets
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*/
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#include <stdio.h>
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#include <string.h>
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#include "private-lib-core.h"
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static const char encode_orig[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz0123456789+/";
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static const char encode_url[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz0123456789-_";
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static const char decode[] = "|$$$}rstuvwxyz{$$$$$$$>?@ABCDEFGHIJKLMNOPQRSTUVW"
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"$$$$$$XYZ[\\]^_`abcdefghijklmnopq";
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static int
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_lws_b64_encode_string(const char *encode, const char *in, int in_len,
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char *out, int out_size)
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{
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unsigned char triple[3];
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int i;
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int line = 0;
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int done = 0;
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while (in_len) {
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int len = 0;
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for (i = 0; i < 3; i++) {
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if (in_len) {
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triple[i] = *in++;
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len++;
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in_len--;
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} else
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triple[i] = 0;
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}
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if (done + 4 >= out_size)
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return -1;
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*out++ = encode[triple[0] >> 2];
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*out++ = encode[(((triple[0] & 0x03) << 4) & 0x30) |
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(((triple[1] & 0xf0) >> 4) & 0x0f)];
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*out++ = (len > 1 ? encode[(((triple[1] & 0x0f) << 2) & 0x3c) |
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(((triple[2] & 0xc0) >> 6) & 3)] : '=');
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*out++ = (len > 2 ? encode[triple[2] & 0x3f] : '=');
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done += 4;
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line += 4;
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}
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if (done + 1 >= out_size)
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return -1;
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*out++ = '\0';
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return done;
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}
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LWS_VISIBLE int
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lws_b64_encode_string(const char *in, int in_len, char *out, int out_size)
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{
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return _lws_b64_encode_string(encode_orig, in, in_len, out, out_size);
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}
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LWS_VISIBLE int
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lws_b64_encode_string_url(const char *in, int in_len, char *out, int out_size)
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{
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return _lws_b64_encode_string(encode_url, in, in_len, out, out_size);
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}
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void
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lws_b64_decode_state_init(struct lws_b64state *state)
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{
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memset(state, 0, sizeof(*state));
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}
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int
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lws_b64_decode_stateful(struct lws_b64state *s, const char *in, size_t *in_len,
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uint8_t *out, size_t *out_size, int final)
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{
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const char *orig_in = in, *end_in = in + *in_len;
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uint8_t *orig_out = out, *end_out = out + *out_size;
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while (in < end_in && *in && out + 4 < end_out) {
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for (; s->i < 4 && in < end_in && *in; s->i++) {
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uint8_t v;
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v = 0;
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s->c = 0;
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while (in < end_in && *in && !v) {
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s->c = v = *in++;
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/* support the url base64 variant too */
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if (v == '-')
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s->c = v = '+';
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if (v == '_')
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s->c = v = '/';
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v = (v < 43 || v > 122) ? 0 : decode[v - 43];
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if (v)
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v = (v == '$') ? 0 : v - 61;
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}
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if (s->c) {
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s->len++;
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if (v)
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s->quad[s->i] = v - 1;
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} else
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s->quad[s->i] = 0;
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}
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if (s->i != 4 && !final)
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continue;
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s->i = 0;
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/*
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* "The '==' sequence indicates that the last group contained
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* only one byte, and '=' indicates that it contained two
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* bytes." (wikipedia)
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*/
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if ((in >= end_in || !*in) && s->c == '=')
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s->len--;
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if (s->len >= 2)
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*out++ = s->quad[0] << 2 | s->quad[1] >> 4;
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if (s->len >= 3)
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*out++ = s->quad[1] << 4 | s->quad[2] >> 2;
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if (s->len >= 4)
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*out++ = ((s->quad[2] << 6) & 0xc0) | s->quad[3];
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s->done += s->len - 1;
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s->len = 0;
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}
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*out = '\0';
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*in_len = in - orig_in;
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*out_size = out - orig_out;
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return 0;
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}
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/*
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* returns length of decoded string in out, or -1 if out was too small
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* according to out_size
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*
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* Only reads up to in_len chars, otherwise if in_len is -1 on entry reads until
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* the first NUL in the input.
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*/
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static int
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_lws_b64_decode_string(const char *in, int in_len, char *out, int out_size)
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{
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struct lws_b64state state;
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size_t il = in_len, ol = out_size;
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if (in_len == -1)
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il = in_len = strlen(in);
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lws_b64_decode_state_init(&state);
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lws_b64_decode_stateful(&state, in, &il, (uint8_t *)out, &ol, 1);
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if (!il)
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return 0;
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return ol;
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}
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LWS_VISIBLE int
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lws_b64_decode_string(const char *in, char *out, int out_size)
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{
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return _lws_b64_decode_string(in, -1, out, out_size);
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}
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LWS_VISIBLE int
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lws_b64_decode_string_len(const char *in, int in_len, char *out, int out_size)
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{
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return _lws_b64_decode_string(in, in_len, out, out_size);
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}
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#if 0
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static const char * const plaintext[] = {
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"any carnal pleasure.",
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"any carnal pleasure",
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"any carnal pleasur",
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"any carnal pleasu",
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"any carnal pleas",
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"Admin:kloikloi"
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};
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static const char * const coded[] = {
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"YW55IGNhcm5hbCBwbGVhc3VyZS4=",
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"YW55IGNhcm5hbCBwbGVhc3VyZQ==",
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"YW55IGNhcm5hbCBwbGVhc3Vy",
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"YW55IGNhcm5hbCBwbGVhc3U=",
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"YW55IGNhcm5hbCBwbGVhcw==",
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"QWRtaW46a2xvaWtsb2k="
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};
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int
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lws_b64_selftest(void)
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{
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char buf[64];
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unsigned int n, r = 0;
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unsigned int test;
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lwsl_notice("%s\n", __func__);
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/* examples from https://en.wikipedia.org/wiki/Base64 */
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for (test = 0; test < (int)LWS_ARRAY_SIZE(plaintext); test++) {
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buf[sizeof(buf) - 1] = '\0';
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n = lws_b64_encode_string(plaintext[test],
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strlen(plaintext[test]), buf, sizeof buf);
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if (n != strlen(coded[test]) || strcmp(buf, coded[test])) {
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lwsl_err("Failed lws_b64 encode selftest "
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"%d result '%s' %d\n", test, buf, n);
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r = -1;
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}
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buf[sizeof(buf) - 1] = '\0';
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n = lws_b64_decode_string(coded[test], buf, sizeof buf);
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if (n != strlen(plaintext[test]) ||
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strcmp(buf, plaintext[test])) {
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lwsl_err("Failed lws_b64 decode selftest "
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"%d result '%s' / '%s', %d / %zu\n",
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test, buf, plaintext[test], n,
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strlen(plaintext[test]));
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lwsl_hexdump_err(buf, n);
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r = -1;
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}
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}
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if (!r)
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lwsl_notice("Base 64 selftests passed\n");
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else
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lwsl_notice("Base64 selftests failed\n");
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return r;
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}
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#endif
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