--- /dev/null
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed 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.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/slice/b64.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+
+#include "src/core/lib/gpr/useful.h"
+#include "src/core/lib/slice/slice_internal.h"
+
+/* --- Constants. --- */
+
+static const int8_t base64_bytes[] = {
+ -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, 0x3E, -1, -1, -1, 0x3F,
+ 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, -1, -1,
+ -1, 0x7F, -1, -1, -1, 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, -1, -1, -1, -1, -1,
+ -1, 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, -1, -1, -1, -1, -1};
+
+static const char base64_url_unsafe_chars[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+static const char base64_url_safe_chars[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
+
+#define GRPC_BASE64_PAD_CHAR '='
+#define GRPC_BASE64_PAD_BYTE 0x7F
+#define GRPC_BASE64_MULTILINE_LINE_LEN 76
+#define GRPC_BASE64_MULTILINE_NUM_BLOCKS (GRPC_BASE64_MULTILINE_LINE_LEN / 4)
+
+/* --- base64 functions. --- */
+
+char* grpc_base64_encode(const void* vdata, size_t data_size, int url_safe,
+ int multiline) {
+ size_t result_projected_size =
+ grpc_base64_estimate_encoded_size(data_size, url_safe, multiline);
+ char* result = static_cast<char*>(gpr_malloc(result_projected_size));
+ grpc_base64_encode_core(result, vdata, data_size, url_safe, multiline);
+ return result;
+}
+
+size_t grpc_base64_estimate_encoded_size(size_t data_size, int url_safe,
+ int multiline) {
+ size_t result_projected_size =
+ 4 * ((data_size + 3) / 3) +
+ 2 * (multiline ? (data_size / (3 * GRPC_BASE64_MULTILINE_NUM_BLOCKS))
+ : 0) +
+ 1;
+ return result_projected_size;
+}
+
+void grpc_base64_encode_core(char* result, const void* vdata, size_t data_size,
+ int url_safe, int multiline) {
+ const unsigned char* data = static_cast<const unsigned char*>(vdata);
+ const char* base64_chars =
+ url_safe ? base64_url_safe_chars : base64_url_unsafe_chars;
+ const size_t result_projected_size =
+ grpc_base64_estimate_encoded_size(data_size, url_safe, multiline);
+
+ char* current = result;
+ size_t num_blocks = 0;
+ size_t i = 0;
+
+ /* Encode each block. */
+ while (data_size >= 3) {
+ *current++ = base64_chars[(data[i] >> 2) & 0x3F];
+ *current++ =
+ base64_chars[((data[i] & 0x03) << 4) | ((data[i + 1] >> 4) & 0x0F)];
+ *current++ =
+ base64_chars[((data[i + 1] & 0x0F) << 2) | ((data[i + 2] >> 6) & 0x03)];
+ *current++ = base64_chars[data[i + 2] & 0x3F];
+
+ data_size -= 3;
+ i += 3;
+ if (multiline && (++num_blocks == GRPC_BASE64_MULTILINE_NUM_BLOCKS)) {
+ *current++ = '\r';
+ *current++ = '\n';
+ num_blocks = 0;
+ }
+ }
+
+ /* Take care of the tail. */
+ if (data_size == 2) {
+ *current++ = base64_chars[(data[i] >> 2) & 0x3F];
+ *current++ =
+ base64_chars[((data[i] & 0x03) << 4) | ((data[i + 1] >> 4) & 0x0F)];
+ *current++ = base64_chars[(data[i + 1] & 0x0F) << 2];
+ *current++ = GRPC_BASE64_PAD_CHAR;
+ } else if (data_size == 1) {
+ *current++ = base64_chars[(data[i] >> 2) & 0x3F];
+ *current++ = base64_chars[(data[i] & 0x03) << 4];
+ *current++ = GRPC_BASE64_PAD_CHAR;
+ *current++ = GRPC_BASE64_PAD_CHAR;
+ }
+
+ GPR_ASSERT(current >= result);
+ GPR_ASSERT((uintptr_t)(current - result) < result_projected_size);
+ result[current - result] = '\0';
+}
+
+grpc_slice grpc_base64_decode(const char* b64, int url_safe) {
+ return grpc_base64_decode_with_len(b64, strlen(b64), url_safe);
+}
+
+static void decode_one_char(const unsigned char* codes, unsigned char* result,
+ size_t* result_offset) {
+ uint32_t packed = (static_cast<uint32_t>(codes[0]) << 2) |
+ (static_cast<uint32_t>(codes[1]) >> 4);
+ result[(*result_offset)++] = static_cast<unsigned char>(packed);
+}
+
+static void decode_two_chars(const unsigned char* codes, unsigned char* result,
+ size_t* result_offset) {
+ uint32_t packed = (static_cast<uint32_t>(codes[0]) << 10) |
+ (static_cast<uint32_t>(codes[1]) << 4) |
+ (static_cast<uint32_t>(codes[2]) >> 2);
+ result[(*result_offset)++] = static_cast<unsigned char>(packed >> 8);
+ result[(*result_offset)++] = static_cast<unsigned char>(packed);
+}
+
+static int decode_group(const unsigned char* codes, size_t num_codes,
+ unsigned char* result, size_t* result_offset) {
+ GPR_ASSERT(num_codes <= 4);
+
+ /* Short end groups that may not have padding. */
+ if (num_codes == 1) {
+ gpr_log(GPR_ERROR, "Invalid group. Must be at least 2 bytes.");
+ return 0;
+ }
+ if (num_codes == 2) {
+ decode_one_char(codes, result, result_offset);
+ return 1;
+ }
+ if (num_codes == 3) {
+ decode_two_chars(codes, result, result_offset);
+ return 1;
+ }
+
+ /* Regular 4 byte groups with padding or not. */
+ GPR_ASSERT(num_codes == 4);
+ if (codes[0] == GRPC_BASE64_PAD_BYTE || codes[1] == GRPC_BASE64_PAD_BYTE) {
+ gpr_log(GPR_ERROR, "Invalid padding detected.");
+ return 0;
+ }
+ if (codes[2] == GRPC_BASE64_PAD_BYTE) {
+ if (codes[3] == GRPC_BASE64_PAD_BYTE) {
+ decode_one_char(codes, result, result_offset);
+ } else {
+ gpr_log(GPR_ERROR, "Invalid padding detected.");
+ return 0;
+ }
+ } else if (codes[3] == GRPC_BASE64_PAD_BYTE) {
+ decode_two_chars(codes, result, result_offset);
+ } else {
+ /* No padding. */
+ uint32_t packed = (static_cast<uint32_t>(codes[0]) << 18) |
+ (static_cast<uint32_t>(codes[1]) << 12) |
+ (static_cast<uint32_t>(codes[2]) << 6) | codes[3];
+ result[(*result_offset)++] = static_cast<unsigned char>(packed >> 16);
+ result[(*result_offset)++] = static_cast<unsigned char>(packed >> 8);
+ result[(*result_offset)++] = static_cast<unsigned char>(packed);
+ }
+ return 1;
+}
+
+grpc_slice grpc_base64_decode_with_len(const char* b64, size_t b64_len,
+ int url_safe) {
+ grpc_slice result = GRPC_SLICE_MALLOC(b64_len);
+ unsigned char* current = GRPC_SLICE_START_PTR(result);
+ size_t result_size = 0;
+ unsigned char codes[4];
+ size_t num_codes = 0;
+
+ while (b64_len--) {
+ unsigned char c = static_cast<unsigned char>(*b64++);
+ signed char code;
+ if (c >= GPR_ARRAY_SIZE(base64_bytes)) continue;
+ if (url_safe) {
+ if (c == '+' || c == '/') {
+ gpr_log(GPR_ERROR, "Invalid character for url safe base64 %c", c);
+ goto fail;
+ }
+ if (c == '-') {
+ c = '+';
+ } else if (c == '_') {
+ c = '/';
+ }
+ }
+ code = base64_bytes[c];
+ if (code == -1) {
+ if (c != '\r' && c != '\n') {
+ gpr_log(GPR_ERROR, "Invalid character %c", c);
+ goto fail;
+ }
+ } else {
+ codes[num_codes++] = static_cast<unsigned char>(code);
+ if (num_codes == 4) {
+ if (!decode_group(codes, num_codes, current, &result_size)) goto fail;
+ num_codes = 0;
+ }
+ }
+ }
+
+ if (num_codes != 0 &&
+ !decode_group(codes, num_codes, current, &result_size)) {
+ goto fail;
+ }
+ GRPC_SLICE_SET_LENGTH(result, result_size);
+ return result;
+
+fail:
+ grpc_slice_unref_internal(result);
+ return grpc_empty_slice();
+}
git://repos.xcallymotion.com / motion2.git / blobdiff