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-rw-r--r--src/base64.cpp290
1 files changed, 156 insertions, 134 deletions
diff --git a/src/base64.cpp b/src/base64.cpp
index 0013c28ac3..851ef72a42 100644
--- a/src/base64.cpp
+++ b/src/base64.cpp
@@ -1,143 +1,165 @@
#include <base64.hpp>
-namespace base64 {
-bool base64_encode(const std::string &input, std::string &output) {
- // This is left as a raw array (and not a range checked std::array) under the
- // suspicion that the optimizer is not smart enough to remove the range checks
- // that would be done below if at were called. As is, this array is 64 bytes
- // long, which should be greater than the max of 0b00111111 when indexed
- // NOLINT calls below are to silence clang-tidy about this
- // TODO(ed) this requires further investigation if a more safe method could be
- // used without performance impact.
- static const char encoding_data[] =
- "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
- size_t input_length = input.size();
-
- // allocate space for output string
- output.clear();
- output.reserve(((input_length + 2) / 3) * 4);
-
- // for each 3-bytes sequence from the input, extract 4 6-bits sequences and
- // encode using
- // encoding_data lookup table.
- // if input do not contains enough chars to complete 3-byte sequence,use pad
- // char '='
- for (size_t i = 0; i < input_length; i++) {
- int base64code0 = 0;
- int base64code1 = 0;
- int base64code2 = 0;
- int base64code3 = 0;
-
- base64code0 = (input[i] >> 2) & 0x3f; // 1-byte 6 bits
-
- output += encoding_data[base64code0]; // NOLINT
- base64code1 = (input[i] << 4) & 0x3f; // 1-byte 2 bits +
-
- if (++i < input_length) {
- base64code1 |= (input[i] >> 4) & 0x0f; // 2-byte 4 bits
- output += encoding_data[base64code1]; // NOLINT
- base64code2 = (input[i] << 2) & 0x3f; // 2-byte 4 bits +
-
- if (++i < input_length) {
- base64code2 |= (input[i] >> 6) & 0x03; // 3-byte 2 bits
- base64code3 = input[i] & 0x3f; // 3-byte 6 bits
- output += encoding_data[base64code2]; // NOLINT
- output += encoding_data[base64code3]; // NOLINT
- } else {
- output += encoding_data[base64code2]; // NOLINT
- output += '=';
- }
- } else {
- output += encoding_data[base64code1]; // NOLINT
- output += '=';
- output += '=';
+namespace base64
+{
+bool base64_encode(const std::string &input, std::string &output)
+{
+ // This is left as a raw array (and not a range checked std::array) under
+ // the suspicion that the optimizer is not smart enough to remove the range
+ // checks that would be done below if at were called. As is, this array is
+ // 64 bytes long, which should be greater than the max of 0b00111111 when
+ // indexed NOLINT calls below are to silence clang-tidy about this
+ // TODO(ed) this requires further investigation if a more safe method could
+ // be used without performance impact.
+ static const char encoding_data[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+ size_t input_length = input.size();
+
+ // allocate space for output string
+ output.clear();
+ output.reserve(((input_length + 2) / 3) * 4);
+
+ // for each 3-bytes sequence from the input, extract 4 6-bits sequences and
+ // encode using
+ // encoding_data lookup table.
+ // if input do not contains enough chars to complete 3-byte sequence,use pad
+ // char '='
+ for (size_t i = 0; i < input_length; i++)
+ {
+ int base64code0 = 0;
+ int base64code1 = 0;
+ int base64code2 = 0;
+ int base64code3 = 0;
+
+ base64code0 = (input[i] >> 2) & 0x3f; // 1-byte 6 bits
+
+ output += encoding_data[base64code0]; // NOLINT
+ base64code1 = (input[i] << 4) & 0x3f; // 1-byte 2 bits +
+
+ if (++i < input_length)
+ {
+ base64code1 |= (input[i] >> 4) & 0x0f; // 2-byte 4 bits
+ output += encoding_data[base64code1]; // NOLINT
+ base64code2 = (input[i] << 2) & 0x3f; // 2-byte 4 bits +
+
+ if (++i < input_length)
+ {
+ base64code2 |= (input[i] >> 6) & 0x03; // 3-byte 2 bits
+ base64code3 = input[i] & 0x3f; // 3-byte 6 bits
+ output += encoding_data[base64code2]; // NOLINT
+ output += encoding_data[base64code3]; // NOLINT
+ }
+ else
+ {
+ output += encoding_data[base64code2]; // NOLINT
+ output += '=';
+ }
+ }
+ else
+ {
+ output += encoding_data[base64code1]; // NOLINT
+ output += '=';
+ output += '=';
+ }
}
- }
- return true;
+ return true;
}
-bool base64_decode(const std::string &input, std::string &output) {
- static const char nop = -1;
- // See note on encoding_data[] in above function
- static const char decoding_data[] = {
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, 62, nop,
- nop, nop, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, nop, nop,
- nop, nop, nop, nop, nop, 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, nop, nop, nop, nop, nop, nop, 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, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
- nop};
-
- size_t input_length = input.size();
-
- // allocate space for output string
- output.clear();
- output.reserve(((input_length + 2) / 3) * 4);
-
- // for each 4-bytes sequence from the input, extract 4 6-bits sequences by
- // droping first two bits
- // and regenerate into 3 8-bits sequences
-
- for (size_t i = 0; i < input_length; i++) {
- char base64code0;
- char base64code1;
- char base64code2 = 0; // initialized to 0 to suppress warnings
- char base64code3;
-
- base64code0 = decoding_data[static_cast<int>(input[i])]; // NOLINT
- if (base64code0 == nop) { // non base64 character
- return false;
+bool base64_decode(const std::string &input, std::string &output)
+{
+ static const char nop = -1;
+ // See note on encoding_data[] in above function
+ static const char decoding_data[] = {
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, 62, nop, nop, nop, 63, 52, 53, 54, 55, 56, 57, 58, 59,
+ 60, 61, nop, nop, nop, nop, nop, nop, nop, 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, nop, nop, nop, nop, nop, nop, 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, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop, nop,
+ nop, nop, nop, nop};
+
+ size_t input_length = input.size();
+
+ // allocate space for output string
+ output.clear();
+ output.reserve(((input_length + 2) / 3) * 4);
+
+ // for each 4-bytes sequence from the input, extract 4 6-bits sequences by
+ // droping first two bits
+ // and regenerate into 3 8-bits sequences
+
+ for (size_t i = 0; i < input_length; i++)
+ {
+ char base64code0;
+ char base64code1;
+ char base64code2 = 0; // initialized to 0 to suppress warnings
+ char base64code3;
+
+ base64code0 = decoding_data[static_cast<int>(input[i])]; // NOLINT
+ if (base64code0 == nop)
+ { // non base64 character
+ return false;
+ }
+ if (!(++i < input_length))
+ { // we need at least two input bytes for first
+ // byte output
+ return false;
+ }
+ base64code1 = decoding_data[static_cast<int>(input[i])]; // NOLINT
+ if (base64code1 == nop)
+ { // non base64 character
+ return false;
+ }
+ output +=
+ static_cast<char>((base64code0 << 2) | ((base64code1 >> 4) & 0x3));
+
+ if (++i < input_length)
+ {
+ char c = input[i];
+ if (c == '=')
+ { // padding , end of input
+ return (base64code1 & 0x0f) == 0;
+ }
+ base64code2 = decoding_data[static_cast<int>(input[i])]; // NOLINT
+ if (base64code2 == nop)
+ { // non base64 character
+ return false;
+ }
+ output += static_cast<char>(((base64code1 << 4) & 0xf0) |
+ ((base64code2 >> 2) & 0x0f));
+ }
+
+ if (++i < input_length)
+ {
+ char c = input[i];
+ if (c == '=')
+ { // padding , end of input
+ return (base64code2 & 0x03) == 0;
+ }
+ base64code3 = decoding_data[static_cast<int>(input[i])]; // NOLINT
+ if (base64code3 == nop)
+ { // non base64 character
+ return false;
+ }
+ output +=
+ static_cast<char>((((base64code2 << 6) & 0xc0) | base64code3));
+ }
}
- if (!(++i < input_length)) { // we need at least two input bytes for first
- // byte output
- return false;
- }
- base64code1 = decoding_data[static_cast<int>(input[i])]; // NOLINT
- if (base64code1 == nop) { // non base64 character
- return false;
- }
- output +=
- static_cast<char>((base64code0 << 2) | ((base64code1 >> 4) & 0x3));
-
- if (++i < input_length) {
- char c = input[i];
- if (c == '=') { // padding , end of input
- return (base64code1 & 0x0f) == 0;
- }
- base64code2 = decoding_data[static_cast<int>(input[i])]; // NOLINT
- if (base64code2 == nop) { // non base64 character
- return false;
- }
- output += static_cast<char>(((base64code1 << 4) & 0xf0) |
- ((base64code2 >> 2) & 0x0f));
- }
-
- if (++i < input_length) {
- char c = input[i];
- if (c == '=') { // padding , end of input
- return (base64code2 & 0x03) == 0;
- }
- base64code3 = decoding_data[static_cast<int>(input[i])]; // NOLINT
- if (base64code3 == nop) { // non base64 character
- return false;
- }
- output += static_cast<char>((((base64code2 << 6) & 0xc0) | base64code3));
- }
- }
- return true;
+ return true;
}
-} // namespace base64
+} // namespace base64
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-05 02:34:50 +0300