mirror of
https://dev.iopsys.eu/bbf/icwmp.git
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144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*
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* zstream - Micro URL I/O stream library
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* Copyright (C) 2010 Steven Barth <steven@midlink.org>
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* Copyright (C) 2010 John Crispin <blogic@openwrt.org>
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License,
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* or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
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*
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*/
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#ifndef HTTP_ZSTREAM
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <errno.h>
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static const unsigned char b64encode_tbl[] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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char* zstream_b64encode(const void *in, size_t *len) {
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size_t lenout, pad, i;
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const uint8_t *data = (const uint8_t*)in;
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lenout = *len / 3;
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lenout *= 4;
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pad = *len % 3;
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if (*len == 0) {
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return strdup("");
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} else if (pad) {
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lenout += 4;
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}
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char *out = malloc(lenout + 1);
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if (!out) {
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return NULL;
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}
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uint8_t *o = (uint8_t*)out;
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for (i = 0; i < *len; i += 3) {
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uint32_t cv = (data[i] << 16) | (data[i+1] << 8) | data[i+2];
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*(o+3) = b64encode_tbl[ cv & 0x3f];
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*(o+2) = b64encode_tbl[(cv >> 6) & 0x3f];
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*(o+1) = b64encode_tbl[(cv >> 12) & 0x3f];
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*o = b64encode_tbl[(cv >> 18) & 0x3f];
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o += 4;
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}
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if (pad) {
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uint32_t cv = data[*len-pad] << 16;
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*(o-1) = '=';
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*(o-2) = '=';
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if (pad == 2) {
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cv |= data[*len-pad+1] << 8;
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*(o-2) = b64encode_tbl[(cv >> 6) & 0x3f];
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}
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*(o-3) = b64encode_tbl[(cv >> 12) & 0x3f];
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*(o-4) = b64encode_tbl[(cv >> 18) & 0x3f];
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}
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out[lenout] = 0;
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*len = lenout;
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return out;
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}
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static const unsigned char b64decode_tbl[] = {
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0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
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0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
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0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x01,
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0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
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0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
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0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
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0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
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0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
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0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
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};
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void* zstream_b64decode(const char *in, size_t *len) {
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size_t lenout, i;
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if (*len == 0) {
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return strdup("");
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} else if (*len % 4) {
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errno = EINVAL;
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return NULL;
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}
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lenout = *len / 4 * 3;
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unsigned char *out = malloc(lenout);
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if (!out) {
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return NULL;
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}
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unsigned char *o = out;
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for (i = 0; i < *len; i += 4) {
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uint32_t cv = 0;
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uint8_t j;
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for (j = 0; j < 4; j++) {
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unsigned char c = in[i + j] - 43;
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if (c > 79 || (c = b64decode_tbl[c]) == 0xff) {
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free(out);
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errno = EINVAL;
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return NULL;
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}
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cv |= c;
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if (j != 3) {
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cv <<= 6;
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}
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}
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*(o+2) = (unsigned char)(cv & 0xff);
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*(o+1) = (unsigned char)((cv >> 8) & 0xff);
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*o = (unsigned char)((cv >> 16) & 0xff);
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o += 3;
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}
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if (in[*len-1] == '=') {
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lenout--;
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}
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if (in[*len-2] == '=') {
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lenout--;
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}
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*len = lenout;
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return out;
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}
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#endif /* HTTP_ZSTREAM */
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