1 : /*
2 : * Copyright 2009 The Native Client Authors. All rights reserved.
3 : * Use of this source code is governed by a BSD-style license that can
4 : * be found in the LICENSE file.
5 : */
6 :
7 : /*
8 : * Reads in text file of hexidecimal values, and build a corresponding segment.
9 : *
10 : * Note: To see what the segment contains, run ncdis on the corresponding
11 : * segment to disassemble it.
12 : *
13 : * Note: The purpose of this code is to make it easy to specify the contents
14 : * of code segments using textual values, so that tests are easier to write.
15 : * The code is NOT industrial strength and shouldn't be used except for simple
16 : * test cases.
17 : */
18 :
19 : #ifndef NACL_TRUSTED_BUT_NOT_TCB
20 : #error("This file is not meant for use in the TCB")
21 : #endif
22 :
23 : #include <stdio.h>
24 : #include <stdlib.h>
25 :
26 : #include "native_client/src/include/portability_string.h"
27 : #include "native_client/src/trusted/validator_x86/nc_read_segment.h"
28 :
29 : /* Defines the maximum number of characters allowed on an input line
30 : * of the input text defined by the commands command line option.
31 : */
32 : #define NACL_MAX_INPUT_LINE 4096
33 :
34 14536 : static void NaClConvertHexToByte(char mini_buf[3], size_t mini_buf_index,
35 14536 : uint8_t* mbase, size_t mbase_size,
36 14536 : size_t* count) {
37 14536 : mini_buf[mini_buf_index] = '\0';
38 14536 : mbase[(*count)++] = (uint8_t)strtoul(mini_buf, NULL, 16);
39 14536 : if (*count == mbase_size) {
40 0 : fprintf(stderr,
41 : "Error: Hex text file specifies more than %"NACL_PRIuS
42 : " bytes of data\n", mbase_size);
43 0 : }
44 14536 : }
45 :
46 : /* Given that the first line of Hex text has been read from the given file,
47 : * and a byte array of the given size, this function read the text of hexidecial
48 : * values, puts them in the byte array, and returns how many bytes are read.
49 : * If any line begins with a pound sign (#), it is assumed to be a comment
50 : * and ignored. If the file contains more hex values that the size of the byte
51 : * array, an error message is printed and the read is truncated to the size of
52 : * the byte array. If the number of non-blank hex values aren't even, the single
53 : * hex value is used as the corresponding byte value.
54 : */
55 935 : static size_t NaClReadHexData(FILE* file, uint8_t* mbase, size_t mbase_size,
56 935 : char input_line[NACL_MAX_INPUT_LINE]) {
57 935 : size_t count = 0;
58 935 : char mini_buf[3];
59 935 : size_t mini_buf_index = 0;
60 935 : char *next;
61 935 : char ch;
62 8776 : while (count < mbase_size) {
63 7841 : if (input_line[0] != '#') {
64 : /* Not a comment line, process. */
65 5709 : next = &input_line[0];
66 5709 : mini_buf_index = 0;
67 105969 : while (count < mbase_size && (ch = *(next++))) {
68 44421 : switch (ch) {
69 : case '0':
70 : case '1':
71 : case '2':
72 : case '3':
73 : case '4':
74 : case '5':
75 : case '6':
76 : case '7':
77 : case '8':
78 : case '9':
79 : case 'a':
80 : case 'b':
81 : case 'c':
82 : case 'd':
83 : case 'e':
84 : case 'f':
85 : case 'A':
86 : case 'B':
87 : case 'C':
88 : case 'D':
89 : case 'E':
90 : case 'F':
91 29072 : mini_buf[mini_buf_index++] = ch;
92 29072 : if (2 == mini_buf_index) {
93 14536 : NaClConvertHexToByte(mini_buf, mini_buf_index, mbase,
94 : mbase_size, &count);
95 14536 : if (count == mbase_size) {
96 0 : return mbase_size;
97 : }
98 14536 : mini_buf_index = 0;
99 14536 : }
100 29072 : break;
101 : default:
102 15349 : break;
103 : }
104 44421 : }
105 5709 : }
106 8776 : if (fgets(input_line, NACL_MAX_INPUT_LINE, file) == NULL) break;
107 6906 : }
108 935 : if (mini_buf_index > 0) {
109 0 : NaClConvertHexToByte(mini_buf, mini_buf_index, mbase, mbase_size, &count);
110 0 : }
111 935 : return count;
112 935 : }
113 :
114 0 : size_t NaClReadHexText(FILE* file, uint8_t* mbase, size_t mbase_size) {
115 0 : char input_line[NACL_MAX_INPUT_LINE];
116 0 : if (fgets(input_line, NACL_MAX_INPUT_LINE, file) == NULL) return 0;
117 0 : return NaClReadHexData(file, mbase, mbase_size, input_line);
118 0 : }
119 :
120 935 : size_t NaClReadHexTextWithPc(FILE* file, NaClPcAddress* pc,
121 935 : uint8_t* mbase, size_t mbase_size) {
122 935 : char input_line[NACL_MAX_INPUT_LINE];
123 935 : *pc = 0; /* Default if no input. */
124 935 : while (1) {
125 2747 : if (fgets(input_line, NACL_MAX_INPUT_LINE, file) == NULL) return 0;
126 2747 : if (input_line[0] == '#') {
127 : /* i.e. treat line as a comment. */
128 1812 : continue;
129 935 : } else if (input_line[0] == '@') {
130 0 : *pc = (NaClPcAddress) STRTOULL(&input_line[1], NULL, 16);
131 0 : } else {
132 935 : return NaClReadHexData(file, mbase, mbase_size, input_line);
133 : }
134 0 : }
135 : /* NOT REACHED */
136 : return 0;
137 935 : }
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