[OpenWrt-Devel] [PATCH] [libubox][v2] b64: add base64 support
Luka Perkov
luka at openwrt.org
Sat Apr 11 21:31:09 EDT 2015
The base code has been taken from zstream project which was
written by Steven Barth.
Signed-off-by: Luka Perkov <luka at openwrt.org>
CC: Steven Barth <steven at midlink.org>
---
changes in v2:
Use new API:
size_t b64decode(void **out, const char *in, size_t len);
size_t b64encode(char **out, const void *in, size_t len);
CMakeLists.txt | 2 +-
b64.c | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
b64.h | 26 ++++++++++
3 files changed, 181 insertions(+), 1 deletion(-)
create mode 100644 b64.c
create mode 100644 b64.h
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 58381da..77f4842 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -14,7 +14,7 @@ IF(JSONC_FOUND)
INCLUDE_DIRECTORIES(${JSONC_INCLUDE_DIRS})
ENDIF()
-SET(SOURCES avl.c avl-cmp.c blob.c blobmsg.c uloop.c usock.c ustream.c ustream-fd.c vlist.c utils.c safe_list.c runqueue.c md5.c kvlist.c ulog.c)
+SET(SOURCES avl.c avl-cmp.c blob.c blobmsg.c uloop.c usock.c ustream.c ustream-fd.c vlist.c utils.c safe_list.c runqueue.c md5.c kvlist.c ulog.c b64.c)
ADD_LIBRARY(ubox SHARED ${SOURCES})
ADD_LIBRARY(ubox-static STATIC ${SOURCES})
diff --git a/b64.c b/b64.c
new file mode 100644
index 0000000..86593d2
--- /dev/null
+++ b/b64.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2011 Steven Barth <steven at midlink.org>
+ * Copyright (C) 2015 Luka Perkov <luka at openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "b64.h"
+
+static const unsigned char b64decode_tbl[] = {
+ 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36,
+ 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff,
+ 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x01,
+ 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
+ 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11,
+ 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
+ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b,
+ 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
+ 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
+ 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33
+};
+
+static inline size_t b64_decode_size(const char *in, size_t len)
+{
+ size_t ret;
+
+ if ((len == 0) || (len % 4))
+ return 0;
+
+ ret = len / 4 * 3;
+
+ if (in[(int) len - 1] == '=')
+ ret--;
+
+ if (in[(int) len - 2] == '=')
+ ret--;
+
+ return ret;
+}
+
+size_t b64decode(void **out, const char *in, size_t len)
+{
+ size_t lenout, i, j;
+ unsigned char *o;
+
+ lenout = b64_decode_size(in, len);
+ if (!lenout) {
+ *out = NULL;
+ return 0;
+ }
+
+ *out = calloc(lenout, sizeof(char));
+ if (!(*out))
+ return 0;
+
+ o = (unsigned char *) *out;
+ for (i = 0; i < len; i += 4) {
+ uint32_t cv = 0;
+ for (j = 0; j < 4; j++) {
+ unsigned char c = in[i + j] - 43;
+ if (c > 79 || (c = b64decode_tbl[c]) == 0xff) {
+ free(*out);
+ *out = NULL;
+ return 0;
+ }
+
+ cv |= c;
+ if (j != 3) {
+ cv <<= 6;
+ }
+ }
+
+ o[2] = (unsigned char)( cv & 0xff);
+ o[1] = (unsigned char)((cv >> 8) & 0xff);
+ o[0] = (unsigned char)((cv >> 16) & 0xff);
+ o += 3;
+ }
+
+ return lenout;
+}
+
+static const unsigned char b64encode_tbl[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static inline size_t b64_encode_size(size_t len)
+{
+ size_t ret;
+
+ if (len == 0)
+ return 0;
+
+ ret = len / 3;
+ ret *= 4;
+
+ if (len % 3)
+ ret += 4;
+
+ return ret;
+}
+
+size_t b64encode(char **out, const void *in, size_t len)
+{
+ size_t lenout, pad, i;
+ const uint8_t *data = (const uint8_t *) in;
+ uint8_t *o;
+
+ lenout = b64_encode_size(len);
+ if (!lenout) {
+ *out = NULL;
+ return 0;
+ }
+
+ *out = calloc(lenout, sizeof(char));
+ if (!(*out))
+ return 0;
+
+ o = (uint8_t *) *out;
+ for (i = 0; i < len; i += 3) {
+ uint32_t cv = (data[i] << 16) | (data[i + 1] << 8) | data[i + 2];
+ o[3] = b64encode_tbl[ cv & 0x3f];
+ o[2] = b64encode_tbl[(cv >> 6 ) & 0x3f];
+ o[1] = b64encode_tbl[(cv >> 12) & 0x3f];
+ o[0] = b64encode_tbl[(cv >> 18) & 0x3f];
+ o += 4;
+ }
+
+ pad = len % 3;
+ if (pad) {
+ uint32_t cv = data[len - pad] << 16;
+ o[-1] = '=';
+ o[-2] = '=';
+ if (pad == 2) {
+ cv |= data[len - pad + 1] << 8;
+ o[-2] = b64encode_tbl[(cv >> 6) & 0x3f];
+ }
+ o[-3] = b64encode_tbl[(cv >> 12) & 0x3f];
+ o[-4] = b64encode_tbl[(cv >> 18) & 0x3f];
+ }
+
+ return lenout;
+}
diff --git a/b64.h b/b64.h
new file mode 100644
index 0000000..098f4d8
--- /dev/null
+++ b/b64.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2011 Steven Barth <steven at midlink.org>
+ * Copyright (C) 2015 Luka Perkov <luka at openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __LIBUBOX_B64_H
+#define __LIBUBOX_B64_H
+
+#include <stddef.h>
+
+size_t b64decode(void **out, const char *in, size_t len);
+size_t b64encode(char **out, const void *in, size_t len);
+
+#endif
--
2.3.5
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