| /* |
| * |
| * Copyright 2016, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #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; |
| } |