Will be used by QBuffer.
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---
Makefile.objs | 2 +-
base64.c | 202 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
base64.h | 18 +++++
3 files changed, 221 insertions(+), 1 deletions(-)
create mode 100644 base64.c
create mode 100644 base64.h
diff --git a/Makefile.objs b/Makefile.objs
index ecdd53e..3d2a27a 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -2,7 +2,7 @@
# QObject
qobject-obj-y = qint.o qstring.o qdict.o qlist.o qfloat.o qbool.o
qobject-obj-y += qjson.o json-lexer.o json-streamer.o json-parser.o
-qobject-obj-y += qerror.o
+qobject-obj-y += qerror.o base64.o
#######################################################################
# block-obj-y is code used by both qemu system emulation and qemu-img
diff --git a/base64.c b/base64.c
new file mode 100644
index 0000000..dd01787
--- /dev/null
+++ b/base64.c
@@ -0,0 +1,202 @@
+/*
+ * Base64 encoder/decoder conforming to RFC 4648
+ * (based on Mozilla's nsprpub/lib/libc/src/base64.c)
+ *
+ * Copyright (C) 2010 Siemens AG
+ *
+ * Authors:
+ * Jan Kiszka <jan.kis...@siemens.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include "inttypes.h"
+#include "base64.h"
+
+static const char base[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static void encode3to4(const char *src, char *dest)
+{
+ uint32_t b32 = 0;
+ int i, j = 18;
+
+ for (i = 0; i < 3; i++) {
+ b32 <<= 8;
+ b32 |= src[i];
+ }
+ for (i = 0; i < 4; i++) {
+ dest[i] = base[(b32 >> j) & 0x3F];
+ j -= 6;
+ }
+}
+
+static void encode2to4(const char *src, char *dest)
+{
+ dest[0] = base[(src[0] >> 2) & 0x3F];
+ dest[1] = base[((src[0] & 0x03) << 4) | ((src[1] >> 4) & 0x0F)];
+ dest[2] = base[(src[1] & 0x0F) << 2];
+ dest[3] = '=';
+}
+
+static void encode1to4(const char *src, char *dest)
+{
+ dest[0] = base[(src[0] >> 2) & 0x3F];
+ dest[1] = base[(src[0] & 0x03) << 4];
+ dest[2] = '=';
+ dest[3] = '=';
+}
+
+/*
+ * Encode data in 'src' of length 'srclen' to a base64 string, saving the
+ * null-terminated result in 'dest'. The size of the destition buffer must be
+ * at least ((srclen + 2) / 3) * 4 + 1.
+ */
+void base64_encode(const void *src, size_t srclen, char *dest)
+{
+ while (srclen >= 3) {
+ encode3to4(src, dest);
+ src += 3;
+ dest += 4;
+ srclen -= 3;
+ }
+ switch (srclen) {
+ case 2:
+ encode2to4(src, dest);
+ dest += 4;
+ break;
+ case 1:
+ encode1to4(src, dest);
+ dest += 4;
+ break;
+ case 0:
+ break;
+ }
+ dest[srclen] = 0;
+}
+
+static int32_t codetovalue(char c)
+{
+ if (c >= 'A' && c <= 'Z') {
+ return c - 'A';
+ } else if (c >= 'a' && c <= 'z') {
+ return c - 'a' + 26;
+ } else if (c >= '0' && c <= '9') {
+ return c - '0' + 52;
+ } else if (c == '+') {
+ return 62;
+ } else if ( c == '/') {
+ return 63;
+ } else {
+ return -1;
+ }
+}
+
+static int decode4to3 (const char *src, char *dest)
+{
+ uint32_t b32 = 0;
+ int32_t bits;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ bits = codetovalue(src[i]);
+ if (bits < 0) {
+ return bits;
+ }
+ b32 <<= 6;
+ b32 |= bits;
+ }
+ dest[0] = (b32 >> 16) & 0xFF;
+ dest[1] = (b32 >> 8) & 0xFF;
+ dest[2] = b32 & 0xFF;
+
+ return 0;
+}
+
+static int decode3to2(const char *src, char *dest)
+{
+ uint32_t b32 = 0;
+ int32_t bits;
+
+ bits = codetovalue(src[0]);
+ if (bits < 0) {
+ return bits;
+ }
+ b32 = (uint32_t)bits;
+ b32 <<= 6;
+
+ bits = codetovalue(src[1]);
+ if (bits < 0) {
+ return bits;
+ }
+ b32 |= (uint32_t)bits;
+ b32 <<= 4;
+
+ bits = codetovalue(src[2]);
+ if (bits < 0) {
+ return bits;
+ }
+ b32 |= ((uint32_t)bits) >> 2;
+
+ dest[0] = (b32 >> 8) & 0xFF;
+ dest[1] = b32 & 0xFF;
+
+ return 0;
+}
+
+static int decode2to1(const char *src, char *dest)
+{
+ uint32_t b32;
+ int32_t bits;
+
+ bits = codetovalue(src[0]);
+ if (bits < 0) {
+ return bits;
+ }
+ b32 = (uint32_t)bits << 2;
+
+ bits = codetovalue(src[1]);
+ if (bits < 0) {
+ return bits;
+ }
+ b32 |= ((uint32_t)bits) >> 4;
+
+ dest[0] = b32;
+
+ return 0;
+}
+
+/*
+ * Convert string 'src' of length 'srclen' from base64 to binary form,
+ * saving the result in 'dest'. The size of the destination buffer must be at
+ * least srclen * 3 / 4.
+ *
+ * Returns 0 on success, -1 on conversion error.
+ */
+int base64_decode(const char *src, size_t srclen, void *dest)
+{
+ int ret;
+
+ while (srclen >= 4) {
+ ret = decode4to3(src, dest);
+ if (ret < 0) {
+ return ret;
+ }
+ src += 4;
+ dest += 3;
+ srclen -= 4;
+ }
+
+ switch (srclen) {
+ case 3:
+ return decode3to2(src, dest);
+ case 2:
+ return decode2to1(src, dest);
+ case 1:
+ return -1;
+ default: /* 0 */
+ return 0;
+ }
+}
diff --git a/base64.h b/base64.h
new file mode 100644
index 0000000..9a0e03a
--- /dev/null
+++ b/base64.h
@@ -0,0 +1,18 @@
+/*
+ * Base64 encoder/decoder conforming to RFC 4648
+ * (based on Mozilla's nsprpub/lib/libc/src/base64.c)
+ *
+ * Copyright (C) 2010 Siemens AG
+ *
+ * Authors:
+ * Jan Kiszka <jan.kis...@siemens.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include <unistd.h>
+
+void base64_encode(const void *src, size_t srclen, char *dest);
+int base64_decode(const char *src, size_t srclen, void *dest);
--
1.6.0.2
