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/*
*
* Copyright 2016 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 "src/core/lib/slice/percent_encoding.h"
#include <grpc/support/log.h>
#include "src/core/lib/slice/slice_internal.h"
const uint8_t grpc_url_percent_encoding_unreserved_bytes[256 / 8] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x60, 0xff, 0x03, 0xfe, 0xff, 0xff,
0x87, 0xfe, 0xff, 0xff, 0x47, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
const uint8_t grpc_compatible_percent_encoding_unreserved_bytes[256 / 8] = {
0x00, 0x00, 0x00, 0x00, 0xdf, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
static bool is_unreserved_character(uint8_t c,
const uint8_t* unreserved_bytes) {
return ((unreserved_bytes[c / 8] >> (c % 8)) & 1) != 0;
}
grpc_slice grpc_percent_encode_slice(grpc_slice slice,
const uint8_t* unreserved_bytes) {
static const uint8_t hex[] = "0123456789ABCDEF";
// first pass: count the number of bytes needed to output this string
size_t output_length = 0;
const uint8_t* slice_start = GRPC_SLICE_START_PTR(slice);
const uint8_t* slice_end = GRPC_SLICE_END_PTR(slice);
const uint8_t* p;
bool any_reserved_bytes = false;
for (p = slice_start; p < slice_end; p++) {
bool unres = is_unreserved_character(*p, unreserved_bytes);
output_length += unres ? 1 : 3;
any_reserved_bytes |= !unres;
}
// no unreserved bytes: return the string unmodified
if (!any_reserved_bytes) {
return grpc_slice_ref_internal(slice);
}
// second pass: actually encode
grpc_slice out = GRPC_SLICE_MALLOC(output_length);
uint8_t* q = GRPC_SLICE_START_PTR(out);
for (p = slice_start; p < slice_end; p++) {
if (is_unreserved_character(*p, unreserved_bytes)) {
*q++ = *p;
} else {
*q++ = '%';
*q++ = hex[*p >> 4];
*q++ = hex[*p & 15];
}
}
GPR_ASSERT(q == GRPC_SLICE_END_PTR(out));
return out;
}
static bool valid_hex(const uint8_t* p, const uint8_t* end) {
if (p >= end) return false;
return (*p >= '0' && *p <= '9') || (*p >= 'a' && *p <= 'f') ||
(*p >= 'A' && *p <= 'F');
}
static uint8_t dehex(uint8_t c) {
if (c >= '0' && c <= '9') return (uint8_t)(c - '0');
if (c >= 'A' && c <= 'F') return (uint8_t)(c - 'A' + 10);
if (c >= 'a' && c <= 'f') return (uint8_t)(c - 'a' + 10);
GPR_UNREACHABLE_CODE(return 255);
}
bool grpc_strict_percent_decode_slice(grpc_slice slice_in,
const uint8_t* unreserved_bytes,
grpc_slice* slice_out) {
const uint8_t* p = GRPC_SLICE_START_PTR(slice_in);
const uint8_t* in_end = GRPC_SLICE_END_PTR(slice_in);
size_t out_length = 0;
bool any_percent_encoded_stuff = false;
while (p != in_end) {
if (*p == '%') {
if (!valid_hex(++p, in_end)) return false;
if (!valid_hex(++p, in_end)) return false;
p++;
out_length++;
any_percent_encoded_stuff = true;
} else if (is_unreserved_character(*p, unreserved_bytes)) {
p++;
out_length++;
} else {
return false;
}
}
if (!any_percent_encoded_stuff) {
*slice_out = grpc_slice_ref_internal(slice_in);
return true;
}
p = GRPC_SLICE_START_PTR(slice_in);
*slice_out = GRPC_SLICE_MALLOC(out_length);
uint8_t* q = GRPC_SLICE_START_PTR(*slice_out);
while (p != in_end) {
if (*p == '%') {
*q++ = (uint8_t)(dehex(p[1]) << 4) | (dehex(p[2]));
p += 3;
} else {
*q++ = *p++;
}
}
GPR_ASSERT(q == GRPC_SLICE_END_PTR(*slice_out));
return true;
}
grpc_slice grpc_permissive_percent_decode_slice(grpc_slice slice_in) {
const uint8_t* p = GRPC_SLICE_START_PTR(slice_in);
const uint8_t* in_end = GRPC_SLICE_END_PTR(slice_in);
size_t out_length = 0;
bool any_percent_encoded_stuff = false;
while (p != in_end) {
if (*p == '%') {
if (!valid_hex(p + 1, in_end) || !valid_hex(p + 2, in_end)) {
p++;
out_length++;
} else {
p += 3;
out_length++;
any_percent_encoded_stuff = true;
}
} else {
p++;
out_length++;
}
}
if (!any_percent_encoded_stuff) {
return grpc_slice_ref_internal(slice_in);
}
p = GRPC_SLICE_START_PTR(slice_in);
grpc_slice out = GRPC_SLICE_MALLOC(out_length);
uint8_t* q = GRPC_SLICE_START_PTR(out);
while (p != in_end) {
if (*p == '%') {
if (!valid_hex(p + 1, in_end) || !valid_hex(p + 2, in_end)) {
*q++ = *p++;
} else {
*q++ = (uint8_t)(dehex(p[1]) << 4) | (dehex(p[2]));
p += 3;
}
} else {
*q++ = *p++;
}
}
GPR_ASSERT(q == GRPC_SLICE_END_PTR(out));
return out;
}
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