Use sourcecode for libjuice

thirdparty/libjuice/src/base64.c

@@ -0,0 +1,90 @@
+/**
+ * Copyright (c) 2021 Paul-Louis Ageneau
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "base64.h"
+
+#include <string.h>
+#include <ctype.h>
+
+int juice_base64_encode(const void *data, size_t size, char *out, size_t out_size) {
+	static const char tab[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+	if (out_size < 4 * ((size + 2) / 3) + 1)
+		return -1;
+
+	const uint8_t *in = (const uint8_t *)data;
+	char *w = out;
+	while (size >= 3) {
+		*w++ = tab[*in >> 2];
+		*w++ = tab[((*in & 0x03) << 4) | (*(in + 1) >> 4)];
+		*w++ = tab[((*(in + 1) & 0x0F) << 2) | (*(in + 2) >> 6)];
+		*w++ = tab[*(in + 2) & 0x3F];
+		in += 3;
+		size -= 3;
+	}
+
+	if (size) {
+		*w++ = tab[*in >> 2];
+		if (size == 1) {
+			*w++ = tab[(*in & 0x03) << 4];
+			*w++ = '=';
+		} else { // size == 2
+			*w++ = tab[((*in & 0x03) << 4) | (*(in + 1) >> 4)];
+			*w++ = tab[(*(in + 1) & 0x0F) << 2];
+		}
+		*w++ = '=';
+	}
+
+	*w = '\0';
+	return (int)(w - out);
+}
+
+int juice_base64_decode(const char *str, void *out, size_t out_size) {
+	const uint8_t *in = (const uint8_t *)str;
+	uint8_t *w = (uint8_t *)out;
+	while (*in && *in != '=') {
+		uint8_t tab[4] = {0, 0, 0, 0};
+		size_t size = 0;
+		while (*in && size < 4) {
+			uint8_t c = *in++;
+			if (isspace(c))
+				continue;
+			if (c == '=')
+				break;
+
+			if ('A' <= c && c <= 'Z')
+				tab[size++] = c - 'A';
+			else if ('a' <= c && c <= 'z')
+				tab[size++] = c + 26 - 'a';
+			else if ('0' <= c && c <= '9')
+				tab[size++] = c + 52 - '0';
+			else if (c == '+' || c == '-')
+				tab[size++] = 62;
+			else if (c == '/' || c == '_')
+				tab[size++] = 63;
+			else
+				return -1; // Invalid character
+		}
+
+		if (size > 0) {
+			if (out_size < size - 1)
+				return -1;
+
+			out_size -= size - 1;
+
+			*w++ = (tab[0] << 2) | (tab[1] >> 4);
+			if (size > 1) {
+				*w++ = (tab[1] << 4) | (tab[2] >> 2);
+				if (size > 2)
+					*w++ = (tab[2] << 6) | tab[3];
+			}
+		}
+	}
+
+	return (int)(w - (uint8_t *)out);
+}