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Simple HTTP client with HTTP/1.1, HTTP/2, and HTTP/3 support
Security advisory:
This version has known vulnerabilities.
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c_src/boringssl/crypto/bio/hexdump.cc
// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// 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
//
// https://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 <openssl/bio.h>
#include <limits.h>
#include <string.h>
#include "../internal.h"
namespace {
// hexdump_ctx contains the state of a hexdump.
struct hexdump_ctx {
BIO *bio;
char right_chars[18]; // the contents of the right-hand side, ASCII dump.
unsigned used; // number of bytes in the current line.
size_t n; // number of bytes total.
unsigned indent;
};
} // namespace
static void hexbyte(char *out, uint8_t b) {
static const char hextable[] = "0123456789abcdef";
out[0] = hextable[b >> 4];
out[1] = hextable[b & 0x0f];
}
static char to_char(uint8_t b) {
if (b < 32 || b > 126) {
return '.';
}
return b;
}
// hexdump_write adds |len| bytes of |data| to the current hex dump described by
// |ctx|.
static int hexdump_write(struct hexdump_ctx *ctx, const uint8_t *data,
size_t len) {
char buf[10];
unsigned l;
// Output lines look like:
// 00000010 2e 2f 30 31 32 33 34 35 36 37 38 ... 3c 3d // |./0123456789:;<=|
// ^ offset ^ extra space ^ ASCII of line
for (size_t i = 0; i < len; i++) {
if (ctx->used == 0) {
// The beginning of a line.
BIO_indent(ctx->bio, ctx->indent, UINT_MAX);
hexbyte(&buf[0], ctx->n >> 24);
hexbyte(&buf[2], ctx->n >> 16);
hexbyte(&buf[4], ctx->n >> 8);
hexbyte(&buf[6], ctx->n);
buf[8] = buf[9] = ' ';
if (BIO_write(ctx->bio, buf, 10) < 0) {
return 0;
}
}
hexbyte(buf, data[i]);
buf[2] = ' ';
l = 3;
if (ctx->used == 7) {
// There's an additional space after the 8th byte.
buf[3] = ' ';
l = 4;
} else if (ctx->used == 15) {
// At the end of the line there's an extra space and the bar for the
// right column.
buf[3] = ' ';
buf[4] = '|';
l = 5;
}
if (BIO_write(ctx->bio, buf, l) < 0) {
return 0;
}
ctx->right_chars[ctx->used] = to_char(data[i]);
ctx->used++;
ctx->n++;
if (ctx->used == 16) {
ctx->right_chars[16] = '|';
ctx->right_chars[17] = '\n';
if (BIO_write(ctx->bio, ctx->right_chars, sizeof(ctx->right_chars)) < 0) {
return 0;
}
ctx->used = 0;
}
}
return 1;
}
// finish flushes any buffered data in |ctx|.
static int finish(struct hexdump_ctx *ctx) {
// See the comments in |hexdump| for the details of this format.
const unsigned n_bytes = ctx->used;
unsigned l;
char buf[5];
if (n_bytes == 0) {
return 1;
}
OPENSSL_memset(buf, ' ', 4);
buf[4] = '|';
for (; ctx->used < 16; ctx->used++) {
l = 3;
if (ctx->used == 7) {
l = 4;
} else if (ctx->used == 15) {
l = 5;
}
if (BIO_write(ctx->bio, buf, l) < 0) {
return 0;
}
}
ctx->right_chars[n_bytes] = '|';
ctx->right_chars[n_bytes + 1] = '\n';
if (BIO_write(ctx->bio, ctx->right_chars, n_bytes + 2) < 0) {
return 0;
}
return 1;
}
int BIO_hexdump(BIO *bio, const uint8_t *data, size_t len, unsigned indent) {
struct hexdump_ctx ctx;
OPENSSL_memset(&ctx, 0, sizeof(ctx));
ctx.bio = bio;
ctx.indent = indent;
if (!hexdump_write(&ctx, data, len) || !finish(&ctx)) {
return 0;
}
return 1;
}