lib/hexdump.c - uboot-imx - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * lib/hexdump.c
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation. See README and COPYING for
  * more details.
  */

 #include <common.h>
 #include <hexdump.h>
 #include <linux/ctype.h>
 #include <linux/compat.h>
 #include <linux/log2.h>
 #include <asm/unaligned.h>

 const char hex_asc[] = "0123456789abcdef";
 const char hex_asc_upper[] = "0123456789ABCDEF";

 #ifdef CONFIG_HEXDUMP
 /**
  * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
  * @buf: data blob to dump
  * @len: number of bytes in the @buf
  * @rowsize: number of bytes to print per line; must be 16 or 32
  * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
  * @linebuf: where to put the converted data
  * @linebuflen: total size of @linebuf, including space for terminating NUL
  * @ascii: include ASCII after the hex output
  *
  * hex_dump_to_buffer() works on one "line" of output at a time, i.e.,
  * 16 or 32 bytes of input data converted to hex + ASCII output.
  *
  * Given a buffer of u8 data, hex_dump_to_buffer() converts the input data
  * to a hex + ASCII dump at the supplied memory location.
  * The converted output is always NUL-terminated.
  *
  * E.g.:
  *   hex_dump_to_buffer(frame->data, frame->len, 16, 1,
  *			linebuf, sizeof(linebuf), true);
  *
  * example output buffer:
  * 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO
  *
  * Return:
  * The amount of bytes placed in the buffer without terminating NUL. If the
  * output was truncated, then the return value is the number of bytes
  * (excluding the terminating NUL) which would have been written to the final
  * string if enough space had been available.
  */
 int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
 		       char *linebuf, size_t linebuflen, bool ascii)
 {
 	const u8 *ptr = buf;
 	int ngroups;
 	u8 ch;
 	int j, lx = 0;
 	int ascii_column;
 	int ret;

 	if (rowsize != 16 && rowsize != 32)
 		rowsize = 16;

 	if (len > rowsize)		/* limit to one line at a time */
 		len = rowsize;
 	if (!is_power_of_2(groupsize) || groupsize > 8)
 		groupsize = 1;
 	if ((len % groupsize) != 0)	/* no mixed size output */
 		groupsize = 1;

 	ngroups = len / groupsize;
 	ascii_column = rowsize * 2 + rowsize / groupsize + 1;

 	if (!linebuflen)
 		goto overflow1;

 	if (!len)
 		goto nil;

 	if (groupsize == 8) {
 		const u64 *ptr8 = buf;

 		for (j = 0; j < ngroups; j++) {
 			ret = snprintf(linebuf + lx, linebuflen - lx,
 				       "%s%16.16llx", j ? " " : "",
 				       get_unaligned(ptr8 + j));
 			if (ret >= linebuflen - lx)
 				goto overflow1;
 			lx += ret;
 		}
 	} else if (groupsize == 4) {
 		const u32 *ptr4 = buf;

 		for (j = 0; j < ngroups; j++) {
 			ret = snprintf(linebuf + lx, linebuflen - lx,
 				       "%s%8.8x", j ? " " : "",
 				       get_unaligned(ptr4 + j));
 			if (ret >= linebuflen - lx)
 				goto overflow1;
 			lx += ret;
 		}
 	} else if (groupsize == 2) {
 		const u16 *ptr2 = buf;

 		for (j = 0; j < ngroups; j++) {
 			ret = snprintf(linebuf + lx, linebuflen - lx,
 				       "%s%4.4x", j ? " " : "",
 				       get_unaligned(ptr2 + j));
 			if (ret >= linebuflen - lx)
 				goto overflow1;
 			lx += ret;
 		}
 	} else {
 		for (j = 0; j < len; j++) {
 			if (linebuflen < lx + 2)
 				goto overflow2;
 			ch = ptr[j];
 			linebuf[lx++] = hex_asc_hi(ch);
 			if (linebuflen < lx + 2)
 				goto overflow2;
 			linebuf[lx++] = hex_asc_lo(ch);
 			if (linebuflen < lx + 2)
 				goto overflow2;
 			linebuf[lx++] = ' ';
 		}
 		if (j)
 			lx--;
 	}
 	if (!ascii)
 		goto nil;

 	while (lx < ascii_column) {
 		if (linebuflen < lx + 2)
 			goto overflow2;
 		linebuf[lx++] = ' ';
 	}
 	for (j = 0; j < len; j++) {
 		if (linebuflen < lx + 2)
 			goto overflow2;
 		ch = ptr[j];
 		linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
 	}
 nil:
 	linebuf[lx] = '\0';
 	return lx;
 overflow2:
 	linebuf[lx++] = '\0';
 overflow1:
 	return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
 }

 /**
  * print_hex_dump - print a text hex dump to syslog for a binary blob of data
  * @prefix_str: string to prefix each line with;
  *  caller supplies trailing spaces for alignment if desired
  * @prefix_type: controls whether prefix of an offset, address, or none
  *  is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
  * @rowsize: number of bytes to print per line; must be 16 or 32
  * @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
  * @buf: data blob to dump
  * @len: number of bytes in the @buf
  * @ascii: include ASCII after the hex output
  *
  * Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump
  * to the stdio, with an optional leading prefix.
  *
  * print_hex_dump() works on one "line" of output at a time, i.e.,
  * 16 or 32 bytes of input data converted to hex + ASCII output.
  * print_hex_dump() iterates over the entire input @buf, breaking it into
  * "line size" chunks to format and print.
  *
  * E.g.:
  *   print_hex_dump("raw data: ", DUMP_PREFIX_ADDRESS, 16, 1, frame->data,
  *                  frame->len, true);
  *
  * Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
  * 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f  @ABCDEFGHIJKLMNO
  * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:
  * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c  pqrstuvwxyz{|}~.
  */
 void print_hex_dump(const char *prefix_str, int prefix_type, int rowsize,
 		    int groupsize, const void *buf, size_t len, bool ascii)
 {
 	const u8 *ptr = buf;
 	int i, linelen, remaining = len;
 	char linebuf[32 * 3 + 2 + 32 + 1];

 	if (rowsize != 16 && rowsize != 32)
 		rowsize = 16;

 	for (i = 0; i < len; i += rowsize) {
 		linelen = min(remaining, rowsize);
 		remaining -= rowsize;

 		hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
 				   linebuf, sizeof(linebuf), ascii);

 		switch (prefix_type) {
 		case DUMP_PREFIX_ADDRESS:
 			printf("%s%p: %s\n", prefix_str, ptr + i, linebuf);
 			break;
 		case DUMP_PREFIX_OFFSET:
 			printf("%s%.8x: %s\n", prefix_str, i, linebuf);
 			break;
 		default:
 			printf("%s%s\n", prefix_str, linebuf);
 			break;
 		}
 	}
 }

 /**
  * print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
  * @prefix_str: string to prefix each line with;
  *  caller supplies trailing spaces for alignment if desired
  * @prefix_type: controls whether prefix of an offset, address, or none
  *  is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
  * @buf: data blob to dump
  * @len: number of bytes in the @buf
  *
  * Calls print_hex_dump(), rowsize of 16, groupsize of 1,
  * and ASCII output included.
  */
 void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 			  const void *buf, size_t len)
 {
 	print_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true);
 }
 #else
 /*
  * Some code in U-Boot copy-pasted from Linux kernel uses both
  * functions below so to keep stuff compilable we keep these stubs here.
  */
 void print_hex_dump(const char *prefix_str, int prefix_type,
 				  int rowsize, int groupsize, const void *buf,
 				  size_t len, bool ascii)
 {
 }

 void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 					const void *buf, size_t len)
 {
 }
 #endif /* CONFIG_HEXDUMP */
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* lib/hexdump.c
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation. See README and COPYING for
	* more details.
	*/

	#include <common.h>
	#include <hexdump.h>
	#include <linux/ctype.h>
	#include <linux/compat.h>
	#include <linux/log2.h>
	#include <asm/unaligned.h>

	const char hex_asc[] = "0123456789abcdef";
	const char hex_asc_upper[] = "0123456789ABCDEF";

	#ifdef CONFIG_HEXDUMP
	/**
	* hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory
	* @buf: data blob to dump
	* @len: number of bytes in the @buf
	* @rowsize: number of bytes to print per line; must be 16 or 32
	* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
	* @linebuf: where to put the converted data
	* @linebuflen: total size of @linebuf, including space for terminating NUL
	* @ascii: include ASCII after the hex output
	*
	* hex_dump_to_buffer() works on one "line" of output at a time, i.e.,
	* 16 or 32 bytes of input data converted to hex + ASCII output.
	*
	* Given a buffer of u8 data, hex_dump_to_buffer() converts the input data
	* to a hex + ASCII dump at the supplied memory location.
	* The converted output is always NUL-terminated.
	*
	* E.g.:
	* hex_dump_to_buffer(frame->data, frame->len, 16, 1,
	* linebuf, sizeof(linebuf), true);
	*
	* example output buffer:
	* 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
	*
	* Return:
	* The amount of bytes placed in the buffer without terminating NUL. If the
	* output was truncated, then the return value is the number of bytes
	* (excluding the terminating NUL) which would have been written to the final
	* string if enough space had been available.
	*/
	int hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize,
	char *linebuf, size_t linebuflen, bool ascii)
	{
	const u8 *ptr = buf;
	int ngroups;
	u8 ch;
	int j, lx = 0;
	int ascii_column;
	int ret;

	if (rowsize != 16 && rowsize != 32)
	rowsize = 16;

	if (len > rowsize) /* limit to one line at a time */
	len = rowsize;
	if (!is_power_of_2(groupsize) \|\| groupsize > 8)
	groupsize = 1;
	if ((len % groupsize) != 0) /* no mixed size output */
	groupsize = 1;

	ngroups = len / groupsize;
	ascii_column = rowsize * 2 + rowsize / groupsize + 1;

	if (!linebuflen)
	goto overflow1;

	if (!len)
	goto nil;

	if (groupsize == 8) {
	const u64 *ptr8 = buf;

	for (j = 0; j < ngroups; j++) {
	ret = snprintf(linebuf + lx, linebuflen - lx,
	"%s%16.16llx", j ? " " : "",
	get_unaligned(ptr8 + j));
	if (ret >= linebuflen - lx)
	goto overflow1;
	lx += ret;
	}
	} else if (groupsize == 4) {
	const u32 *ptr4 = buf;

	for (j = 0; j < ngroups; j++) {
	ret = snprintf(linebuf + lx, linebuflen - lx,
	"%s%8.8x", j ? " " : "",
	get_unaligned(ptr4 + j));
	if (ret >= linebuflen - lx)
	goto overflow1;
	lx += ret;
	}
	} else if (groupsize == 2) {
	const u16 *ptr2 = buf;

	for (j = 0; j < ngroups; j++) {
	ret = snprintf(linebuf + lx, linebuflen - lx,
	"%s%4.4x", j ? " " : "",
	get_unaligned(ptr2 + j));
	if (ret >= linebuflen - lx)
	goto overflow1;
	lx += ret;
	}
	} else {
	for (j = 0; j < len; j++) {
	if (linebuflen < lx + 2)
	goto overflow2;
	ch = ptr[j];
	linebuf[lx++] = hex_asc_hi(ch);
	if (linebuflen < lx + 2)
	goto overflow2;
	linebuf[lx++] = hex_asc_lo(ch);
	if (linebuflen < lx + 2)
	goto overflow2;
	linebuf[lx++] = ' ';
	}
	if (j)
	lx--;
	}
	if (!ascii)
	goto nil;

	while (lx < ascii_column) {
	if (linebuflen < lx + 2)
	goto overflow2;
	linebuf[lx++] = ' ';
	}
	for (j = 0; j < len; j++) {
	if (linebuflen < lx + 2)
	goto overflow2;
	ch = ptr[j];
	linebuf[lx++] = (isascii(ch) && isprint(ch)) ? ch : '.';
	}
	nil:
	linebuf[lx] = '\0';
	return lx;
	overflow2:
	linebuf[lx++] = '\0';
	overflow1:
	return ascii ? ascii_column + len : (groupsize * 2 + 1) * ngroups - 1;
	}

	/**
	* print_hex_dump - print a text hex dump to syslog for a binary blob of data
	* @prefix_str: string to prefix each line with;
	* caller supplies trailing spaces for alignment if desired
	* @prefix_type: controls whether prefix of an offset, address, or none
	* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
	* @rowsize: number of bytes to print per line; must be 16 or 32
	* @groupsize: number of bytes to print at a time (1, 2, 4, 8; default = 1)
	* @buf: data blob to dump
	* @len: number of bytes in the @buf
	* @ascii: include ASCII after the hex output
	*
	* Given a buffer of u8 data, print_hex_dump() prints a hex + ASCII dump
	* to the stdio, with an optional leading prefix.
	*
	* print_hex_dump() works on one "line" of output at a time, i.e.,
	* 16 or 32 bytes of input data converted to hex + ASCII output.
	* print_hex_dump() iterates over the entire input @buf, breaking it into
	* "line size" chunks to format and print.
	*
	* E.g.:
	* print_hex_dump("raw data: ", DUMP_PREFIX_ADDRESS, 16, 1, frame->data,
	* frame->len, true);
	*
	* Example output using %DUMP_PREFIX_OFFSET and 1-byte mode:
	* 0009ab42: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f @ABCDEFGHIJKLMNO
	* Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode:
	* ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{\|}~.
	*/
	void print_hex_dump(const char *prefix_str, int prefix_type, int rowsize,
	int groupsize, const void *buf, size_t len, bool ascii)
	{
	const u8 *ptr = buf;
	int i, linelen, remaining = len;
	char linebuf[32 * 3 + 2 + 32 + 1];

	if (rowsize != 16 && rowsize != 32)
	rowsize = 16;

	for (i = 0; i < len; i += rowsize) {
	linelen = min(remaining, rowsize);
	remaining -= rowsize;

	hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
	linebuf, sizeof(linebuf), ascii);

	switch (prefix_type) {
	case DUMP_PREFIX_ADDRESS:
	printf("%s%p: %s\n", prefix_str, ptr + i, linebuf);
	break;
	case DUMP_PREFIX_OFFSET:
	printf("%s%.8x: %s\n", prefix_str, i, linebuf);
	break;
	default:
	printf("%s%s\n", prefix_str, linebuf);
	break;
	}
	}
	}

	/**
	* print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
	* @prefix_str: string to prefix each line with;
	* caller supplies trailing spaces for alignment if desired
	* @prefix_type: controls whether prefix of an offset, address, or none
	* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
	* @buf: data blob to dump
	* @len: number of bytes in the @buf
	*
	* Calls print_hex_dump(), rowsize of 16, groupsize of 1,
	* and ASCII output included.
	*/
	void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
	const void *buf, size_t len)
	{
	print_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true);
	}
	#else
	/*
	* Some code in U-Boot copy-pasted from Linux kernel uses both
	* functions below so to keep stuff compilable we keep these stubs here.
	*/
	void print_hex_dump(const char *prefix_str, int prefix_type,
	int rowsize, int groupsize, const void *buf,
	size_t len, bool ascii)
	{
	}

	void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
	const void *buf, size_t len)
	{
	}
	#endif /* CONFIG_HEXDUMP */