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192 lines
6.2 KiB
C
192 lines
6.2 KiB
C
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.] */
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#include <openssl/bio.h>
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#include <limits.h>
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#include <string.h>
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#include "../internal.h"
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// hexdump_ctx contains the state of a hexdump.
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struct hexdump_ctx {
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BIO *bio;
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char right_chars[18]; // the contents of the right-hand side, ASCII dump.
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unsigned used; // number of bytes in the current line.
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size_t n; // number of bytes total.
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unsigned indent;
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};
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static void hexbyte(char *out, uint8_t b) {
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static const char hextable[] = "0123456789abcdef";
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out[0] = hextable[b>>4];
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out[1] = hextable[b&0x0f];
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}
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static char to_char(uint8_t b) {
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if (b < 32 || b > 126) {
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return '.';
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}
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return b;
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}
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// hexdump_write adds |len| bytes of |data| to the current hex dump described by
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// |ctx|.
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static int hexdump_write(struct hexdump_ctx *ctx, const uint8_t *data,
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size_t len) {
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char buf[10];
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unsigned l;
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// Output lines look like:
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// 00000010 2e 2f 30 31 32 33 34 35 36 37 38 ... 3c 3d // |./0123456789:;<=|
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// ^ offset ^ extra space ^ ASCII of line
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for (size_t i = 0; i < len; i++) {
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if (ctx->used == 0) {
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// The beginning of a line.
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BIO_indent(ctx->bio, ctx->indent, UINT_MAX);
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hexbyte(&buf[0], ctx->n >> 24);
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hexbyte(&buf[2], ctx->n >> 16);
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hexbyte(&buf[4], ctx->n >> 8);
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hexbyte(&buf[6], ctx->n);
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buf[8] = buf[9] = ' ';
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if (BIO_write(ctx->bio, buf, 10) < 0) {
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return 0;
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}
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}
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hexbyte(buf, data[i]);
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buf[2] = ' ';
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l = 3;
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if (ctx->used == 7) {
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// There's an additional space after the 8th byte.
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buf[3] = ' ';
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l = 4;
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} else if (ctx->used == 15) {
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// At the end of the line there's an extra space and the bar for the
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// right column.
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buf[3] = ' ';
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buf[4] = '|';
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l = 5;
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}
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if (BIO_write(ctx->bio, buf, l) < 0) {
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return 0;
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}
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ctx->right_chars[ctx->used] = to_char(data[i]);
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ctx->used++;
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ctx->n++;
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if (ctx->used == 16) {
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ctx->right_chars[16] = '|';
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ctx->right_chars[17] = '\n';
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if (BIO_write(ctx->bio, ctx->right_chars, sizeof(ctx->right_chars)) < 0) {
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return 0;
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}
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ctx->used = 0;
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}
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}
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return 1;
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}
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// finish flushes any buffered data in |ctx|.
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static int finish(struct hexdump_ctx *ctx) {
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// See the comments in |hexdump| for the details of this format.
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const unsigned n_bytes = ctx->used;
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unsigned l;
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char buf[5];
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if (n_bytes == 0) {
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return 1;
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}
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OPENSSL_memset(buf, ' ', 4);
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buf[4] = '|';
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for (; ctx->used < 16; ctx->used++) {
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l = 3;
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if (ctx->used == 7) {
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l = 4;
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} else if (ctx->used == 15) {
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l = 5;
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}
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if (BIO_write(ctx->bio, buf, l) < 0) {
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return 0;
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}
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}
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ctx->right_chars[n_bytes] = '|';
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ctx->right_chars[n_bytes + 1] = '\n';
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if (BIO_write(ctx->bio, ctx->right_chars, n_bytes + 2) < 0) {
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return 0;
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}
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return 1;
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}
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int BIO_hexdump(BIO *bio, const uint8_t *data, size_t len, unsigned indent) {
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struct hexdump_ctx ctx;
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OPENSSL_memset(&ctx, 0, sizeof(ctx));
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ctx.bio = bio;
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ctx.indent = indent;
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if (!hexdump_write(&ctx, data, len) || !finish(&ctx)) {
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return 0;
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}
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return 1;
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}
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