--- /dev/null
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.] */
+
+#include <openssl/bio.h>
+
+#include <limits.h>
+#include <string.h>
+
+#include "../internal.h"
+
+
+// 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;
+};
+
+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;
+}
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