0685322f4a
Given a specification of bitfields defined e.g. as follows:
specfile:
{
"field1" : 8,
"field2" : 4,
"field3" : 4
}
and a set of values for setting defaults:
setterfile:
{
"field1" = 0xff,
"field2" = 0xf,
"field3" = 0xf
}
You can generate a binary packed blob as follows:
./blobtool specfile setterfile binaryoutput
binaryoutput: ff ff
The reverse is also possible, i.e. you can regenerate the setter:
./blobtool -d specfile binaryoutput setterorig
setterorig:
# AUTOGENERATED SETTER BY BLOBTOOL
{
"field1" = 0xff,
"field2" = 0xf,
"field3" = 0xf
}
This tool comes with spec/set files for X200 flash descriptor
and ICH9M GbE region, and can be extended or used to decompile
other data blobs with known specs.
Change-Id: I744d6b421003feb4fc460133603af7e6bd80b1d6
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/17445
Tested-by: build bot (Jenkins)
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Martin Roth <martinroth@google.com>
145 lines
2.6 KiB
Text
145 lines
2.6 KiB
Text
/*
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* blobtool - Compiler/Decompiler for data blobs with specs
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* Copyright (C) 2017 Damien Zammit <damien@zamaudio.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "blobtool.tab.h"
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extern struct blob binary;
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unsigned int parsehex (char *s)
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{
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unsigned int i, nib, val = 0;
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unsigned int nibs = strlen(s) - 2;
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for (i = 2; i < nibs + 2; i++) {
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if (s[i] >= '0' && s[i] <= '9') {
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nib = s[i] - '0';
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} else if (s[i] >= 'a' && s[i] <= 'f') {
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nib = s[i] - 'a' + 10;
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} else if (s[i] >= 'A' && s[i] <= 'F') {
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nib = s[i] - 'A' + 10;
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} else {
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return 0;
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}
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val |= nib << (((nibs - 1) - (i - 2)) * 4);
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}
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return val;
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}
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char* stripquotes (char *string)
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{
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char *stripped;
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unsigned int len = strlen(string);
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if (len >= 2 && string[0] == '\"' && string[len-1] == '\"') {
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stripped = (char *) malloc (len - 2 + 1);
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snprintf (stripped, len - 2 + 1, "%s", string+1);
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stripped[len-2] = '\0';
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return stripped;
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} else {
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return 0;
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}
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}
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%}
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%option noyywrap
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%option nounput
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DIGIT1to9 [1-9]
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DIGIT [0-9]
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DIGITS {DIGIT}+
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INT {DIGIT}|{DIGIT1to9}{DIGITS}|-{DIGIT}|-{DIGIT1to9}{DIGITS}
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FRAC [.]{DIGITS}
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E [eE][+-]?
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EXP {E}{DIGITS}
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HEX_DIGIT [0-9a-fA-F]
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HEX_DIGITS {HEX_DIGIT}+
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NUMBER {INT}|{INT}{FRAC}|{INT}{EXP}|{INT}{FRAC}{EXP}
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UNICODECHAR \\u{HEX_DIGIT}{HEX_DIGIT}{HEX_DIGIT}{HEX_DIGIT}
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ALPHA [a-zA-Z]
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SPECIAL [()\[\]"'@_\-+:;/\\.,<> ]
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VARCHAR {ALPHA}|{DIGIT}|{SPECIAL}
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CHAR {VARCHAR}|{UNICODECHAR}
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CHARS {CHAR}+
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QUOTE ["]
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HEX_PREFIX [0][x]
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HEX {HEX_PREFIX}{HEX_DIGITS}
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STRING {QUOTE}{QUOTE}|{QUOTE}{CHARS}{QUOTE}
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COMMENT [#]{CHARS}[\n]|[#]\n
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%%
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{STRING} {
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yylval.str = stripquotes(yytext);
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return name;
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};
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{NUMBER} {
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yylval.u32 = atoi(yytext);
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return val;
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};
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{HEX} {
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yylval.u32 = parsehex(yytext);
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return val;
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};
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\{ {
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return '{';
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};
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\} {
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return '}';
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};
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\[ {
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return '[';
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};
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\] {
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return ']';
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};
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, {
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return ',';
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};
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: {
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return ':';
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};
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= {
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return '=';
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};
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[ \t\n]+ /* ignore whitespace */;
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{COMMENT} /* ignore comments */
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\% {
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return '%';
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};
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<<EOF>> { return eof; };
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%%
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void set_input_string(char* in) {
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yy_scan_string(in);
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}
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