author | Yuya Nishihara <yuya@tcha.org> |
Sun, 27 Oct 2019 12:36:52 +0900 | |
branch | stable |
changeset 43336 | a71578ec6257 |
parent 41336 | 763b45bc4483 |
child 46819 | d4ba4d51f85f |
permissions | -rw-r--r-- |
72 | 1 |
/* |
2 |
mpatch.c - efficient binary patching for Mercurial |
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4 |
This implements a patch algorithm that's O(m + nlog n) where m is the |
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size of the output and n is the number of patches. |
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Given a list of binary patches, it unpacks each into a hunk list, |
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then combines the hunk lists with a treewise recursion to form a |
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single hunk list. This hunk list is then applied to the original |
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text. |
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12 |
The text (or binary) fragments are copied directly from their source |
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Python objects into a preallocated output string to avoid the |
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allocation of intermediate Python objects. Working memory is about 2x |
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the total number of hunks. |
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2859 | 17 |
Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
72 | 18 |
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This software may be used and distributed according to the terms |
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of the GNU General Public License, incorporated herein by reference. |
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*/ |
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#include <limits.h> |
72 | 24 |
#include <stdlib.h> |
25 |
#include <string.h> |
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26 |
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#include "bitmanipulation.h" |
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#include "compat.h" |
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#include "mpatch.h" |
72 | 30 |
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/* VC9 doesn't include bool and lacks stdbool.h based on cext/util.h */ |
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#if defined(_MSC_VER) || __STDC_VERSION__ < 199901L |
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33 |
#define true 1 |
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34 |
#define false 0 |
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typedef unsigned char bool; |
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#else |
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#include <stdbool.h> |
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#endif |
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39 |
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static struct mpatch_flist *lalloc(ssize_t size) |
72 | 41 |
{ |
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struct mpatch_flist *a = NULL; |
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if (size < 1) { |
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size = 1; |
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} |
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47 |
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a = (struct mpatch_flist *)malloc(sizeof(struct mpatch_flist)); |
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if (a) { |
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a->base = (struct mpatch_frag *)malloc( |
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sizeof(struct mpatch_frag) * size); |
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Set correct exception for another possible malloc error in mpatch.c
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if (a->base) { |
128 | 53 |
a->head = a->tail = a->base; |
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return a; |
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55 |
} |
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free(a); |
128 | 57 |
} |
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catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
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return NULL; |
72 | 59 |
} |
60 |
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void mpatch_lfree(struct mpatch_flist *a) |
72 | 62 |
{ |
128 | 63 |
if (a) { |
64 |
free(a->base); |
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free(a); |
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} |
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72 | 67 |
} |
68 |
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static ssize_t lsize(struct mpatch_flist *a) |
72 | 70 |
{ |
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return a->tail - a->head; |
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} |
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/* add helper to add src and *dest iff it won't overflow */ |
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static inline bool safeadd(int src, int *dest) |
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{ |
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77 |
if ((src > 0) == (*dest > 0)) { |
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78 |
if (*dest > 0) { |
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if (src > (INT_MAX - *dest)) { |
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80 |
return false; |
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} |
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82 |
} else { |
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if (src < (INT_MIN - *dest)) { |
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return false; |
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} |
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} |
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87 |
} |
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*dest += src; |
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return true; |
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} |
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91 |
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/* subtract src from dest and store result in dest */ |
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static inline bool safesub(int src, int *dest) |
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{ |
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if (((src > 0) && (*dest < INT_MIN + src)) || |
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96 |
((src < 0) && (*dest > INT_MAX + src))) { |
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97 |
return false; |
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98 |
} |
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99 |
*dest -= src; |
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100 |
return true; |
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101 |
} |
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102 |
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72 | 103 |
/* move hunks in source that are less cut to dest, compensating |
104 |
for changes in offset. the last hunk may be split if necessary. |
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105 |
*/ |
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106 |
static int gather(struct mpatch_flist *dest, struct mpatch_flist *src, int cut, |
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107 |
int offset) |
72 | 108 |
{ |
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109 |
struct mpatch_frag *d = dest->tail, *s = src->head; |
72 | 110 |
int postend, c, l; |
111 |
||
112 |
while (s != src->tail) { |
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113 |
int soffset = s->start; |
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114 |
if (!safeadd(offset, &soffset)) { |
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115 |
break; /* add would overflow, oh well */ |
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116 |
} |
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117 |
if (soffset >= cut) { |
82 | 118 |
break; /* we've gone far enough */ |
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119 |
} |
72 | 120 |
|
38192
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121 |
postend = offset; |
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122 |
if (!safeadd(s->start, &postend) || |
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123 |
!safeadd(s->len, &postend)) { |
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124 |
break; |
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125 |
} |
72 | 126 |
if (postend <= cut) { |
127 |
/* save this hunk */ |
|
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128 |
int tmp = s->start; |
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129 |
if (!safesub(s->end, &tmp)) { |
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130 |
break; |
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131 |
} |
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132 |
if (!safeadd(s->len, &tmp)) { |
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133 |
break; |
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134 |
} |
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135 |
if (!safeadd(tmp, &offset)) { |
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136 |
break; /* add would overflow, oh well */ |
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137 |
} |
72 | 138 |
*d++ = *s++; |
34634
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139 |
} else { |
72 | 140 |
/* break up this hunk */ |
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141 |
c = cut; |
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142 |
if (!safesub(offset, &c)) { |
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|
143 |
break; |
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|
144 |
} |
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145 |
if (s->end < c) { |
72 | 146 |
c = s->end; |
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147 |
} |
72 | 148 |
l = cut - offset - s->start; |
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149 |
if (s->len < l) { |
72 | 150 |
l = s->len; |
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151 |
} |
72 | 152 |
|
153 |
offset += s->start + l - c; |
|
154 |
||
155 |
d->start = s->start; |
|
156 |
d->end = c; |
|
157 |
d->len = l; |
|
158 |
d->data = s->data; |
|
159 |
d++; |
|
160 |
s->start = c; |
|
161 |
s->len = s->len - l; |
|
162 |
s->data = s->data + l; |
|
163 |
||
82 | 164 |
break; |
72 | 165 |
} |
166 |
} |
|
167 |
||
168 |
dest->tail = d; |
|
169 |
src->head = s; |
|
170 |
return offset; |
|
171 |
} |
|
172 |
||
173 |
/* like gather, but with no output list */ |
|
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|
174 |
static int discard(struct mpatch_flist *src, int cut, int offset) |
72 | 175 |
{ |
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|
176 |
struct mpatch_frag *s = src->head; |
72 | 177 |
int postend, c, l; |
178 |
||
179 |
while (s != src->tail) { |
|
38193
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|
180 |
int cmpcut = s->start; |
7f22ef3c0ee7
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|
181 |
if (!safeadd(offset, &cmpcut)) { |
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|
182 |
break; |
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|
183 |
} |
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diff
changeset
|
184 |
if (cmpcut >= cut) { |
82 | 185 |
break; |
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|
186 |
} |
72 | 187 |
|
38193
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|
188 |
postend = offset; |
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diff
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|
189 |
if (!safeadd(s->start, &postend)) { |
7f22ef3c0ee7
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|
190 |
break; |
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diff
changeset
|
191 |
} |
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diff
changeset
|
192 |
if (!safeadd(s->len, &postend)) { |
7f22ef3c0ee7
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diff
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|
193 |
break; |
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parents:
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diff
changeset
|
194 |
} |
72 | 195 |
if (postend <= cut) { |
38193
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parents:
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diff
changeset
|
196 |
/* do the subtraction first to avoid UB integer overflow |
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|
197 |
*/ |
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|
198 |
int tmp = s->start; |
7f22ef3c0ee7
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diff
changeset
|
199 |
if (!safesub(s->end, &tmp)) { |
7f22ef3c0ee7
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diff
changeset
|
200 |
break; |
7f22ef3c0ee7
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parents:
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diff
changeset
|
201 |
} |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
202 |
if (!safeadd(s->len, &tmp)) { |
7f22ef3c0ee7
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
203 |
break; |
7f22ef3c0ee7
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parents:
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diff
changeset
|
204 |
} |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
205 |
if (!safeadd(tmp, &offset)) { |
7f22ef3c0ee7
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diff
changeset
|
206 |
break; |
7f22ef3c0ee7
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parents:
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diff
changeset
|
207 |
} |
72 | 208 |
s++; |
34634
2e08b69bcd29
mpatch: reflow two oddly formatted else blocks with clang-format
Augie Fackler <augie@google.com>
parents:
34633
diff
changeset
|
209 |
} else { |
38193
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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diff
changeset
|
210 |
c = cut; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
211 |
if (!safesub(offset, &c)) { |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
212 |
break; |
7f22ef3c0ee7
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parents:
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diff
changeset
|
213 |
} |
41336
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cleanup: use clang-tidy to add missing {} around one-line statements
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parents:
38195
diff
changeset
|
214 |
if (s->end < c) { |
72 | 215 |
c = s->end; |
41336
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parents:
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diff
changeset
|
216 |
} |
72 | 217 |
l = cut - offset - s->start; |
41336
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diff
changeset
|
218 |
if (s->len < l) { |
72 | 219 |
l = s->len; |
41336
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cleanup: use clang-tidy to add missing {} around one-line statements
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diff
changeset
|
220 |
} |
72 | 221 |
|
222 |
offset += s->start + l - c; |
|
223 |
s->start = c; |
|
224 |
s->len = s->len - l; |
|
225 |
s->data = s->data + l; |
|
226 |
||
82 | 227 |
break; |
72 | 228 |
} |
229 |
} |
|
230 |
||
231 |
src->head = s; |
|
232 |
return offset; |
|
233 |
} |
|
234 |
||
235 |
/* combine hunk lists a and b, while adjusting b for offset changes in a/ |
|
236 |
this deletes a and b and returns the resultant list. */ |
|
29692
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parents:
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diff
changeset
|
237 |
static struct mpatch_flist *combine(struct mpatch_flist *a, |
34800
761355833867
mpatch: reformat function prototypes with clang-format
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parents:
34634
diff
changeset
|
238 |
struct mpatch_flist *b) |
72 | 239 |
{ |
29692
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parents:
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diff
changeset
|
240 |
struct mpatch_flist *c = NULL; |
6b3a8d034b69
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parents:
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diff
changeset
|
241 |
struct mpatch_frag *bh, *ct; |
72 | 242 |
int offset = 0, post; |
243 |
||
41336
763b45bc4483
cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents:
38195
diff
changeset
|
244 |
if (a && b) { |
128 | 245 |
c = lalloc((lsize(a) + lsize(b)) * 2); |
41336
763b45bc4483
cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents:
38195
diff
changeset
|
246 |
} |
128 | 247 |
|
248 |
if (c) { |
|
72 | 249 |
|
128 | 250 |
for (bh = b->head; bh != b->tail; bh++) { |
251 |
/* save old hunks */ |
|
252 |
offset = gather(c, a, bh->start, offset); |
|
72 | 253 |
|
128 | 254 |
/* discard replaced hunks */ |
255 |
post = discard(a, bh->end, offset); |
|
72 | 256 |
|
128 | 257 |
/* insert new hunk */ |
258 |
ct = c->tail; |
|
38195
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
259 |
ct->start = bh->start; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
260 |
ct->end = bh->end; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
261 |
if (!safesub(offset, &(ct->start)) || |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
262 |
!safesub(post, &(ct->end))) { |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
263 |
/* It was already possible to exit |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
264 |
* this function with a return value |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
265 |
* of NULL before the safesub()s were |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
266 |
* added, so this should be fine. */ |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
267 |
mpatch_lfree(c); |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
268 |
c = NULL; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
269 |
goto done; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
270 |
} |
128 | 271 |
ct->len = bh->len; |
272 |
ct->data = bh->data; |
|
273 |
c->tail++; |
|
274 |
offset = post; |
|
275 |
} |
|
276 |
||
277 |
/* hold on to tail from a */ |
|
29692
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
278 |
memcpy(c->tail, a->head, sizeof(struct mpatch_frag) * lsize(a)); |
128 | 279 |
c->tail += lsize(a); |
72 | 280 |
} |
38195
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
281 |
done: |
29692
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
282 |
mpatch_lfree(a); |
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
283 |
mpatch_lfree(b); |
72 | 284 |
return c; |
285 |
} |
|
286 |
||
287 |
/* decode a binary patch into a hunk list */ |
|
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
288 |
int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res) |
72 | 289 |
{ |
29692
6b3a8d034b69
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Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
290 |
struct mpatch_flist *l; |
6b3a8d034b69
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Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
291 |
struct mpatch_frag *lt; |
20167
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
292 |
int pos = 0; |
72 | 293 |
|
294 |
/* assume worst case size, we won't have many of these lists */ |
|
28656
b6ed2505d6cf
parsers: fix list sizing rounding error (SEC)
Matt Mackall <mpm@selenic.com>
parents:
20167
diff
changeset
|
295 |
l = lalloc(len / 12 + 1); |
41336
763b45bc4483
cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents:
38195
diff
changeset
|
296 |
if (!l) { |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
297 |
return MPATCH_ERR_NO_MEM; |
41336
763b45bc4483
cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents:
38195
diff
changeset
|
298 |
} |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
299 |
|
72 | 300 |
lt = l->tail; |
301 |
||
38187
90a274965de7
mpatch: be more careful about parsing binary patch data (SEC)
Augie Fackler <augie@google.com>
parents:
34801
diff
changeset
|
302 |
/* We check against len-11 to ensure we have at least 12 bytes |
90a274965de7
mpatch: be more careful about parsing binary patch data (SEC)
Augie Fackler <augie@google.com>
parents:
34801
diff
changeset
|
303 |
left in the patch so we can read our three be32s out of it. */ |
90a274965de7
mpatch: be more careful about parsing binary patch data (SEC)
Augie Fackler <augie@google.com>
parents:
34801
diff
changeset
|
304 |
while (pos >= 0 && pos < (len - 11)) { |
20167
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
305 |
lt->start = getbe32(bin + pos); |
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
306 |
lt->end = getbe32(bin + pos + 4); |
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
307 |
lt->len = getbe32(bin + pos + 8); |
41336
763b45bc4483
cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents:
38195
diff
changeset
|
308 |
if (lt->start < 0 || lt->start > lt->end || lt->len < 0) { |
28657
b9714d958e89
parsers: detect short records (SEC)
Matt Mackall <mpm@selenic.com>
parents:
28656
diff
changeset
|
309 |
break; /* sanity check */ |
41336
763b45bc4483
cleanup: use clang-tidy to add missing {} around one-line statements
Augie Fackler <augie@google.com>
parents:
38195
diff
changeset
|
310 |
} |
38194
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
311 |
if (!safeadd(12, &pos)) { |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
312 |
break; |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
313 |
} |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
314 |
lt->data = bin + pos; |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
315 |
if (!safeadd(lt->len, &pos)) { |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
316 |
break; |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
317 |
} |
72 | 318 |
lt++; |
319 |
} |
|
320 |
||
20167
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
321 |
if (pos != len) { |
29692
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
322 |
mpatch_lfree(l); |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
323 |
return MPATCH_ERR_CANNOT_BE_DECODED; |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
324 |
} |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
325 |
|
72 | 326 |
l->tail = lt; |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
327 |
*res = l; |
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
328 |
return 0; |
72 | 329 |
} |
330 |
||
331 |
/* calculate the size of resultant text */ |
|
29693
b9b9f9a92481
mpatch: split mpatch into two files
Maciej Fijalkowski <fijall@gmail.com>
parents:
29692
diff
changeset
|
332 |
ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l) |
72 | 333 |
{ |
29691
e9a0bcc9314d
mpatch: change Py_ssize_t to ssize_t in places that will be later copied
Maciej Fijalkowski <fijall@gmail.com>
parents:
29444
diff
changeset
|
334 |
ssize_t outlen = 0, last = 0; |
29692
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
335 |
struct mpatch_frag *f = l->head; |
72 | 336 |
|
337 |
while (f != l->tail) { |
|
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
338 |
if (f->start < last || f->end > len) { |
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55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
339 |
return MPATCH_ERR_INVALID_PATCH; |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
340 |
} |
72 | 341 |
outlen += f->start - last; |
342 |
last = f->end; |
|
343 |
outlen += f->len; |
|
344 |
f++; |
|
345 |
} |
|
346 |
||
347 |
outlen += len - last; |
|
348 |
return outlen; |
|
349 |
} |
|
350 |
||
29693
b9b9f9a92481
mpatch: split mpatch into two files
Maciej Fijalkowski <fijall@gmail.com>
parents:
29692
diff
changeset
|
351 |
int mpatch_apply(char *buf, const char *orig, ssize_t len, |
34800
761355833867
mpatch: reformat function prototypes with clang-format
Augie Fackler <augie@google.com>
parents:
34634
diff
changeset
|
352 |
struct mpatch_flist *l) |
72 | 353 |
{ |
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6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
354 |
struct mpatch_frag *f = l->head; |
72 | 355 |
int last = 0; |
356 |
char *p = buf; |
|
357 |
||
358 |
while (f != l->tail) { |
|
38189
faa924469635
mpatch: ensure fragment start isn't past the end of orig (SEC)
Augie Fackler <augie@google.com>
parents:
38188
diff
changeset
|
359 |
if (f->start < last || f->start > len || f->end > len || |
faa924469635
mpatch: ensure fragment start isn't past the end of orig (SEC)
Augie Fackler <augie@google.com>
parents:
38188
diff
changeset
|
360 |
last < 0) { |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
361 |
return MPATCH_ERR_INVALID_PATCH; |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
362 |
} |
72 | 363 |
memcpy(p, orig + last, f->start - last); |
364 |
p += f->start - last; |
|
365 |
memcpy(p, f->data, f->len); |
|
366 |
last = f->end; |
|
367 |
p += f->len; |
|
368 |
f++; |
|
369 |
} |
|
38188
1acfc35d478c
mpatch: protect against underflow in mpatch_apply (SEC)
Augie Fackler <augie@google.com>
parents:
38187
diff
changeset
|
370 |
if (last < 0) { |
1acfc35d478c
mpatch: protect against underflow in mpatch_apply (SEC)
Augie Fackler <augie@google.com>
parents:
38187
diff
changeset
|
371 |
return MPATCH_ERR_INVALID_PATCH; |
1acfc35d478c
mpatch: protect against underflow in mpatch_apply (SEC)
Augie Fackler <augie@google.com>
parents:
38187
diff
changeset
|
372 |
} |
72 | 373 |
memcpy(p, orig + last, len - last); |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
374 |
return 0; |
72 | 375 |
} |
376 |
||
377 |
/* recursively generate a patch of all bins between start and end */ |
|
34800
761355833867
mpatch: reformat function prototypes with clang-format
Augie Fackler <augie@google.com>
parents:
34634
diff
changeset
|
378 |
struct mpatch_flist * |
761355833867
mpatch: reformat function prototypes with clang-format
Augie Fackler <augie@google.com>
parents:
34634
diff
changeset
|
379 |
mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t), |
761355833867
mpatch: reformat function prototypes with clang-format
Augie Fackler <augie@google.com>
parents:
34634
diff
changeset
|
380 |
ssize_t start, ssize_t end) |
72 | 381 |
{ |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
382 |
ssize_t len; |
72 | 383 |
|
384 |
if (start + 1 == end) { |
|
385 |
/* trivial case, output a decoded list */ |
|
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
386 |
return get_next_item(bins, start); |
72 | 387 |
} |
388 |
||
389 |
/* divide and conquer, memory management is elsewhere */ |
|
390 |
len = (end - start) / 2; |
|
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
391 |
return combine(mpatch_fold(bins, get_next_item, start, start + len), |
34801
1f4249c764f1
mpatch: switch alignment of wrapped line from tab to spaces with clang-format
Augie Fackler <augie@google.com>
parents:
34800
diff
changeset
|
392 |
mpatch_fold(bins, get_next_item, start + len, end)); |
72 | 393 |
} |