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-rw-r--r--encoding/apr_base64.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/encoding/apr_base64.c b/encoding/apr_base64.c
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* base64 encoder/decoder. Originally part of main/util.c
+ * but moved here so that support/ab and apr_sha1.c could
+ * use it. This meant removing the apr_palloc()s and adding
+ * ugly 'len' functions, which is quite a nasty cost.
+ */
+
+#undef NDEBUG /* always abort() on assert()ion failure */
+#include <assert.h>
+
+#include "apr_base64.h"
+#if APR_CHARSET_EBCDIC
+#include "apr_xlate.h"
+#endif /* APR_CHARSET_EBCDIC */
+
+/* Above APR_BASE64_ENCODE_MAX length the encoding can't fit in an int >= 0 */
+#define APR_BASE64_ENCODE_MAX 1610612733
+
+/* Above APR_BASE64_DECODE_MAX length the decoding can't fit in an int >= 0 */
+#define APR_BASE64_DECODE_MAX 2863311524u
+
+/* aaaack but it's fast and const should make it shared text page. */
+static const unsigned char pr2six[256] =
+{
+#if !APR_CHARSET_EBCDIC
+ /* ASCII table */
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
+ 64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+ 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
+ 64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+ 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
+#else /*APR_CHARSET_EBCDIC*/
+ /* EBCDIC table */
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 63, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 64, 64, 64, 64, 64, 64,
+ 64, 35, 36, 37, 38, 39, 40, 41, 42, 43, 64, 64, 64, 64, 64, 64,
+ 64, 64, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64, 64,
+ 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+ 64, 0, 1, 2, 3, 4, 5, 6, 7, 8, 64, 64, 64, 64, 64, 64,
+ 64, 9, 10, 11, 12, 13, 14, 15, 16, 17, 64, 64, 64, 64, 64, 64,
+ 64, 64, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64, 64,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64
+#endif /*APR_CHARSET_EBCDIC*/
+};
+
+#if APR_CHARSET_EBCDIC
+static apr_xlate_t *xlate_to_ebcdic;
+static unsigned char os_toascii[256];
+
+APU_DECLARE(apr_status_t) apr_base64init_ebcdic(apr_xlate_t *to_ascii,
+ apr_xlate_t *to_ebcdic)
+{
+ int i;
+ apr_size_t inbytes_left, outbytes_left;
+ apr_status_t rv;
+ int onoff;
+
+ /* Only single-byte conversion is supported.
+ */
+ rv = apr_xlate_sb_get(to_ascii, &onoff);
+ if (rv) {
+ return rv;
+ }
+ if (!onoff) { /* If conversion is not single-byte-only */
+ return APR_EINVAL;
+ }
+ rv = apr_xlate_sb_get(to_ebcdic, &onoff);
+ if (rv) {
+ return rv;
+ }
+ if (!onoff) { /* If conversion is not single-byte-only */
+ return APR_EINVAL;
+ }
+ xlate_to_ebcdic = to_ebcdic;
+ for (i = 0; i < sizeof(os_toascii); i++) {
+ os_toascii[i] = i;
+ }
+ inbytes_left = outbytes_left = sizeof(os_toascii);
+ apr_xlate_conv_buffer(to_ascii, os_toascii, &inbytes_left,
+ os_toascii, &outbytes_left);
+
+ return APR_SUCCESS;
+}
+#endif /*APR_CHARSET_EBCDIC*/
+
+APU_DECLARE(int) apr_base64_decode_len(const char *bufcoded)
+{
+ register const unsigned char *bufin;
+ register apr_size_t nprbytes;
+
+ bufin = (const unsigned char *) bufcoded;
+ while (pr2six[*(bufin++)] <= 63);
+ nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;
+ assert(nprbytes <= APR_BASE64_DECODE_MAX);
+
+ return (int)(((nprbytes + 3u) / 4u) * 3u + 1u);
+}
+
+APU_DECLARE(int) apr_base64_decode(char *bufplain, const char *bufcoded)
+{
+#if APR_CHARSET_EBCDIC
+ apr_size_t inbytes_left, outbytes_left;
+#endif /* APR_CHARSET_EBCDIC */
+ int len;
+
+ len = apr_base64_decode_binary((unsigned char *) bufplain, bufcoded);
+#if APR_CHARSET_EBCDIC
+ inbytes_left = outbytes_left = len;
+ apr_xlate_conv_buffer(xlate_to_ebcdic, bufplain, &inbytes_left,
+ bufplain, &outbytes_left);
+#endif /* APR_CHARSET_EBCDIC */
+ bufplain[len] = '\0';
+ return len;
+}
+
+/* This is the same as apr_base64_decode() except on EBCDIC machines, where
+ * the conversion of the output to ebcdic is left out.
+ */
+APU_DECLARE(int) apr_base64_decode_binary(unsigned char *bufplain,
+ const char *bufcoded)
+{
+ int nbytesdecoded;
+ register const unsigned char *bufin;
+ register unsigned char *bufout;
+ register apr_size_t nprbytes;
+
+ bufin = (const unsigned char *) bufcoded;
+ while (pr2six[*(bufin++)] <= 63);
+ nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;
+ assert(nprbytes <= APR_BASE64_DECODE_MAX);
+ nbytesdecoded = (int)(((nprbytes + 3u) / 4u) * 3u);
+
+ bufout = (unsigned char *) bufplain;
+ bufin = (const unsigned char *) bufcoded;
+
+ while (nprbytes >= 4) {
+ *(bufout++) =
+ (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
+ *(bufout++) =
+ (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
+ *(bufout++) =
+ (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
+ bufin += 4;
+ nprbytes -= 4;
+ }
+
+ /* Note: (nprbytes == 1) would be an error, so just ignore that case */
+ if (nprbytes > 1) {
+ *(bufout++) =
+ (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
+ }
+ if (nprbytes > 2) {
+ *(bufout++) =
+ (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
+ }
+
+ return nbytesdecoded - (int)((4u - nprbytes) & 3u);
+}
+
+static const char basis_64[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+APU_DECLARE(int) apr_base64_encode_len(int len)
+{
+ assert(len >= 0 && len <= APR_BASE64_ENCODE_MAX);
+
+ return ((len + 2) / 3 * 4) + 1;
+}
+
+APU_DECLARE(int) apr_base64_encode(char *encoded, const char *string, int len)
+{
+#if !APR_CHARSET_EBCDIC
+ return apr_base64_encode_binary(encoded, (const unsigned char *) string, len);
+#else /* APR_CHARSET_EBCDIC */
+ int i;
+ char *p;
+
+ assert(len >= 0 && len <= APR_BASE64_ENCODE_MAX);
+
+ p = encoded;
+ for (i = 0; i < len - 2; i += 3) {
+ *p++ = basis_64[(os_toascii[string[i]] >> 2) & 0x3F];
+ *p++ = basis_64[((os_toascii[string[i]] & 0x3) << 4) |
+ ((int) (os_toascii[string[i + 1]] & 0xF0) >> 4)];
+ *p++ = basis_64[((os_toascii[string[i + 1]] & 0xF) << 2) |
+ ((int) (os_toascii[string[i + 2]] & 0xC0) >> 6)];
+ *p++ = basis_64[os_toascii[string[i + 2]] & 0x3F];
+ }
+ if (i < len) {
+ *p++ = basis_64[(os_toascii[string[i]] >> 2) & 0x3F];
+ if (i == (len - 1)) {
+ *p++ = basis_64[((os_toascii[string[i]] & 0x3) << 4)];
+ *p++ = '=';
+ }
+ else {
+ *p++ = basis_64[((os_toascii[string[i]] & 0x3) << 4) |
+ ((int) (os_toascii[string[i + 1]] & 0xF0) >> 4)];
+ *p++ = basis_64[((os_toascii[string[i + 1]] & 0xF) << 2)];
+ }
+ *p++ = '=';
+ }
+
+ *p++ = '\0';
+ return (unsigned int)(p - encoded);
+#endif /* APR_CHARSET_EBCDIC */
+}
+
+/* This is the same as apr_base64_encode() except on EBCDIC machines, where
+ * the conversion of the input to ascii is left out.
+ */
+APU_DECLARE(int) apr_base64_encode_binary(char *encoded,
+ const unsigned char *string, int len)
+{
+ int i;
+ char *p;
+
+ assert(len >= 0 && len <= APR_BASE64_ENCODE_MAX);
+
+ p = encoded;
+ for (i = 0; i < len - 2; i += 3) {
+ *p++ = basis_64[(string[i] >> 2) & 0x3F];
+ *p++ = basis_64[((string[i] & 0x3) << 4) |
+ ((int) (string[i + 1] & 0xF0) >> 4)];
+ *p++ = basis_64[((string[i + 1] & 0xF) << 2) |
+ ((int) (string[i + 2] & 0xC0) >> 6)];
+ *p++ = basis_64[string[i + 2] & 0x3F];
+ }
+ if (i < len) {
+ *p++ = basis_64[(string[i] >> 2) & 0x3F];
+ if (i == (len - 1)) {
+ *p++ = basis_64[((string[i] & 0x3) << 4)];
+ *p++ = '=';
+ }
+ else {
+ *p++ = basis_64[((string[i] & 0x3) << 4) |
+ ((int) (string[i + 1] & 0xF0) >> 4)];
+ *p++ = basis_64[((string[i + 1] & 0xF) << 2)];
+ }
+ *p++ = '=';
+ }
+
+ *p++ = '\0';
+ return (unsigned int)(p - encoded);
+}
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