/*
- * $Id$
+ * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
+ *
+ * Squid software is distributed under GPLv2+ license and includes
+ * contributions from numerous individuals and organizations.
+ * Please see the COPYING and CONTRIBUTORS files for details.
*/
-#include "config.h"
-#include "util.h"
+/*
+ * Copied from Nettle 3.4 under GPLv2, with adjustments
+ */
-#if HAVE_STDIO_H
-#include <stdio.h>
-#endif
-#if HAVE_STDLIB_H
-#include <stdlib.h>
-#endif
+#include "squid.h"
+#include "base64.h"
+#if !HAVE_NETTLE_BASE64_H || !HAVE_NETTLE34_BASE64
-static void base64_init(void);
+/* base64-encode.c
-static int base64_initialized = 0;
-#define BASE64_VALUE_SZ 256
-#define BASE64_RESULT_SZ 8192
-int base64_value[BASE64_VALUE_SZ];
-const char base64_code[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ Copyright (C) 2002 Niels Möller
+ This file is part of GNU Nettle.
-static void
-base64_init(void)
-{
- int i;
+ GNU Nettle is free software: you can redistribute it and/or
+ modify it under the terms of either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ or both in parallel, as here.
+
+ GNU Nettle is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see http://www.gnu.org/licenses/.
+*/
- for (i = 0; i < BASE64_VALUE_SZ; i++)
- base64_value[i] = -1;
+#define TABLE_INVALID -1
+#define TABLE_SPACE -2
+#define TABLE_END -3
- for (i = 0; i < 64; i++)
- base64_value[(int) base64_code[i]] = i;
- base64_value['='] = 0;
+void
+base64_decode_init(struct base64_decode_ctx *ctx)
+{
+ static const signed char base64_decode_table[0x100] =
+ {
+ /* White space is HT, VT, FF, CR, LF and SPC */
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -2, -2, -2, -2, -2, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
+ 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -3, -1, -1,
+ -1, 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, -1, -1, -1, -1, -1,
+ -1, 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, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+ };
- base64_initialized = 1;
+ ctx->word = ctx->bits = ctx->padding = 0;
+ ctx->table = base64_decode_table;
}
-char *
-base64_decode(const char *p)
+int
+base64_decode_single(struct base64_decode_ctx *ctx,
+ uint8_t *dst,
+ char src)
{
- static char result[BASE64_RESULT_SZ];
- int j;
- int c;
- long val;
- if (!p)
- return NULL;
- if (!base64_initialized)
- base64_init();
- val = c = 0;
- for (j = 0; *p && j + 4 < BASE64_RESULT_SZ; p++) {
- unsigned int k = ((unsigned char) *p) % BASE64_VALUE_SZ;
- if (base64_value[k] < 0)
- continue;
- val <<= 6;
- val += base64_value[k];
- if (++c < 4)
- continue;
- /* One quantum of four encoding characters/24 bit */
- result[j++] = (val >> 16) & 0xff; /* High 8 bits */
- result[j++] = (val >> 8) & 0xff; /* Mid 8 bits */
- result[j++] = val & 0xff; /* Low 8 bits */
- val = c = 0;
+ int data = ctx->table[(uint8_t) src];
+
+ switch(data)
+ {
+ default:
+ assert(data >= 0 && data < 0x40);
+
+ if (ctx->padding)
+ return -1;
+
+ ctx->word = ctx->word << 6 | data;
+ ctx->bits += 6;
+
+ if (ctx->bits >= 8)
+ {
+ ctx->bits -= 8;
+ dst[0] = ctx->word >> ctx->bits;
+ return 1;
+ }
+ else return 0;
+
+ case TABLE_INVALID:
+ return -1;
+
+ case TABLE_SPACE:
+ return 0;
+
+ case TABLE_END:
+ /* There can be at most two padding characters. */
+ if (!ctx->bits || ctx->padding > 2)
+ return -1;
+
+ if (ctx->word & ( (1<<ctx->bits) - 1))
+ /* We shouldn't have any leftover bits */
+ return -1;
+
+ ctx->padding++;
+ ctx->bits -= 2;
+ return 0;
}
- result[j] = 0;
- return result;
}
-/* adopted from http://ftp.sunet.se/pub2/gnu/vm/base64-encode.c with adjustments */
-const char *
-base64_encode(const char *decoded_str)
+int
+base64_decode_update(struct base64_decode_ctx *ctx,
+ size_t *dst_length,
+ uint8_t *dst,
+ size_t src_length,
+ const char *src)
{
- static char result[BASE64_RESULT_SZ];
- int bits = 0;
- int char_count = 0;
- int out_cnt = 0;
- int c;
-
- if (!decoded_str)
- return decoded_str;
-
- if (!base64_initialized)
- base64_init();
-
- while ((c = (unsigned char) *decoded_str++) && out_cnt < sizeof(result) - 5) {
- bits += c;
- char_count++;
- if (char_count == 3) {
- result[out_cnt++] = base64_code[bits >> 18];
- result[out_cnt++] = base64_code[(bits >> 12) & 0x3f];
- result[out_cnt++] = base64_code[(bits >> 6) & 0x3f];
- result[out_cnt++] = base64_code[bits & 0x3f];
- bits = 0;
- char_count = 0;
- } else {
- bits <<= 8;
+ size_t done;
+ size_t i;
+
+ for (i = 0, done = 0; i<src_length; i++)
+ switch(base64_decode_single(ctx, dst + done, src[i]))
+ {
+ case -1:
+ return 0;
+ case 1:
+ done++;
+ /* Fall through */
+ case 0:
+ break;
+ default:
+ abort();
}
- }
- if (char_count != 0) {
- bits <<= 16 - (8 * char_count);
- result[out_cnt++] = base64_code[bits >> 18];
- result[out_cnt++] = base64_code[(bits >> 12) & 0x3f];
- if (char_count == 1) {
- result[out_cnt++] = '=';
- result[out_cnt++] = '=';
- } else {
- result[out_cnt++] = base64_code[(bits >> 6) & 0x3f];
- result[out_cnt++] = '=';
+
+ assert(done <= BASE64_DECODE_LENGTH(src_length));
+
+ *dst_length = done;
+ return 1;
+}
+
+int
+base64_decode_final(struct base64_decode_ctx *ctx)
+{
+ return ctx->bits == 0;
+}
+
+/* base64-encode.c */
+
+#define ENCODE(alphabet,x) ((alphabet)[0x3F & (x)])
+
+static void
+encode_raw(const char *alphabet,
+ char *dst, size_t length, const uint8_t *src)
+{
+ const uint8_t *in = src + length;
+ char *out = dst + BASE64_ENCODE_RAW_LENGTH(length);
+
+ unsigned left_over = length % 3;
+
+ if (left_over)
+ {
+ in -= left_over;
+ *--out = '=';
+ switch(left_over)
+ {
+ case 1:
+ *--out = '=';
+ *--out = ENCODE(alphabet, (in[0] << 4));
+ break;
+
+ case 2:
+ *--out = ENCODE(alphabet, (in[1] << 2));
+ *--out = ENCODE(alphabet, ((in[0] << 4) | (in[1] >> 4)));
+ break;
+
+ default:
+ abort();
}
+ *--out = ENCODE(alphabet, (in[0] >> 2));
}
- result[out_cnt] = '\0'; /* terminate */
- return result;
+
+ while (in > src)
+ {
+ in -= 3;
+ *--out = ENCODE(alphabet, (in[2]));
+ *--out = ENCODE(alphabet, ((in[1] << 2) | (in[2] >> 6)));
+ *--out = ENCODE(alphabet, ((in[0] << 4) | (in[1] >> 4)));
+ *--out = ENCODE(alphabet, (in[0] >> 2));
+ }
+ assert(in == src);
+ assert(out == dst);
}
-/* adopted from http://ftp.sunet.se/pub2/gnu/vm/base64-encode.c with adjustments */
-const char *
-base64_encode_bin(const char *data, int len)
+static const char base64_encode_table[64] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "abcdefghijklmnopqrstuvwxyz"
+ "0123456789+/";
+
+void
+base64_encode_raw(char *dst, size_t length, const uint8_t *src)
{
- static char result[BASE64_RESULT_SZ];
- int bits = 0;
- int char_count = 0;
- int out_cnt = 0;
-
- if (!data)
- return data;
-
- if (!base64_initialized)
- base64_init();
-
- while (len-- && out_cnt < sizeof(result) - 5) {
- int c = (unsigned char) *data++;
- bits += c;
- char_count++;
- if (char_count == 3) {
- result[out_cnt++] = base64_code[bits >> 18];
- result[out_cnt++] = base64_code[(bits >> 12) & 0x3f];
- result[out_cnt++] = base64_code[(bits >> 6) & 0x3f];
- result[out_cnt++] = base64_code[bits & 0x3f];
- bits = 0;
- char_count = 0;
- } else {
- bits <<= 8;
- }
+ encode_raw(base64_encode_table, dst, length, src);
+}
+
+void
+base64_encode_group(char *dst, uint32_t group)
+{
+ *dst++ = ENCODE(base64_encode_table, (group >> 18));
+ *dst++ = ENCODE(base64_encode_table, (group >> 12));
+ *dst++ = ENCODE(base64_encode_table, (group >> 6));
+ *dst++ = ENCODE(base64_encode_table, group);
+}
+
+void
+base64_encode_init(struct base64_encode_ctx *ctx)
+{
+ ctx->word = ctx->bits = 0;
+ ctx->alphabet = base64_encode_table;
+}
+
+/* Encodes a single byte. */
+size_t
+base64_encode_single(struct base64_encode_ctx *ctx,
+ char *dst,
+ uint8_t src)
+{
+ unsigned done = 0;
+ unsigned word = ctx->word << 8 | src;
+ unsigned bits = ctx->bits + 8;
+
+ while (bits >= 6)
+ {
+ bits -= 6;
+ dst[done++] = ENCODE(ctx->alphabet, (word >> bits));
}
- if (char_count != 0) {
- bits <<= 16 - (8 * char_count);
- result[out_cnt++] = base64_code[bits >> 18];
- result[out_cnt++] = base64_code[(bits >> 12) & 0x3f];
- if (char_count == 1) {
- result[out_cnt++] = '=';
- result[out_cnt++] = '=';
- } else {
- result[out_cnt++] = base64_code[(bits >> 6) & 0x3f];
- result[out_cnt++] = '=';
- }
+
+ ctx->bits = bits;
+ ctx->word = word;
+
+ assert(done <= 2);
+
+ return done;
+}
+
+/* Returns the number of output characters. DST should point to an
+ * area of size at least BASE64_ENCODE_LENGTH(length). */
+size_t
+base64_encode_update(struct base64_encode_ctx *ctx,
+ char *dst,
+ size_t length,
+ const uint8_t *src)
+{
+ size_t done = 0;
+ size_t left = length;
+ unsigned left_over;
+ size_t bulk;
+
+ while (ctx->bits && left)
+ {
+ left--;
+ done += base64_encode_single(ctx, dst + done, *src++);
+ }
+
+ left_over = left % 3;
+ bulk = left - left_over;
+
+ if (bulk)
+ {
+ assert(!(bulk % 3));
+
+ encode_raw(ctx->alphabet, dst + done, bulk, src);
+ done += BASE64_ENCODE_RAW_LENGTH(bulk);
+ src += bulk;
+ left = left_over;
+ }
+
+ while (left)
+ {
+ left--;
+ done += base64_encode_single(ctx, dst + done, *src++);
}
- result[out_cnt] = '\0'; /* terminate */
- return result;
+
+ assert(done <= BASE64_ENCODE_LENGTH(length));
+
+ return done;
}
+
+/* DST should point to an area of size at least
+ * BASE64_ENCODE_FINAL_SIZE */
+size_t
+base64_encode_final(struct base64_encode_ctx *ctx,
+ char *dst)
+{
+ unsigned done = 0;
+ unsigned bits = ctx->bits;
+
+ if (bits)
+ {
+ dst[done++] = ENCODE(ctx->alphabet, (ctx->word << (6 - ctx->bits)));
+ for (; bits < 6; bits += 2)
+ dst[done++] = '=';
+
+ ctx->bits = 0;
+ }
+
+ assert(done <= BASE64_ENCODE_FINAL_LENGTH);
+ return done;
+}
+
+#endif /* !HAVE_NETTLE_BASE64_H || !HAVE_NETTLE34_BASE64 */
+
projects / thirdparty / squid.git / blobdiff