author | Matt Harbison <matt_harbison@yahoo.com> |
Wed, 12 Sep 2018 23:10:59 -0400 | |
changeset 39593 | c8514f858788 |
parent 38195 | 9c5ced5276d6 |
child 41336 | 763b45bc4483 |
permissions | -rw-r--r-- |
72 | 1 |
/* |
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mpatch.c - efficient binary patching for Mercurial |
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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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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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Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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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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#include "bitmanipulation.h" |
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#include "compat.h" |
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#include "mpatch.h" |
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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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#define true 1 |
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#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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static struct mpatch_flist *lalloc(ssize_t size) |
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{ |
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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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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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if (a->base) { |
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a->head = a->tail = a->base; |
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return a; |
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} |
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free(a); |
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} |
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catch errors and throw exception with invalid binary patch data
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return NULL; |
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} |
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void mpatch_lfree(struct mpatch_flist *a) |
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{ |
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if (a) { |
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free(a->base); |
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free(a); |
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} |
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} |
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static ssize_t lsize(struct mpatch_flist *a) |
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{ |
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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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if ((src > 0) == (*dest > 0)) { |
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if (*dest > 0) { |
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if (src > (INT_MAX - *dest)) { |
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return false; |
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} |
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} 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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} |
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*dest += src; |
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return true; |
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} |
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90 |
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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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((src < 0) && (*dest > INT_MAX + src))) { |
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return false; |
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} |
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*dest -= src; |
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return true; |
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} |
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/* move hunks in source that are less cut to dest, compensating |
103 |
for changes in offset. the last hunk may be split if necessary. |
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*/ |
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static int gather(struct mpatch_flist *dest, struct mpatch_flist *src, int cut, |
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int offset) |
72 | 107 |
{ |
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struct mpatch_frag *d = dest->tail, *s = src->head; |
72 | 109 |
int postend, c, l; |
110 |
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111 |
while (s != src->tail) { |
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int soffset = s->start; |
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113 |
if (!safeadd(offset, &soffset)) |
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114 |
break; /* add would overflow, oh well */ |
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115 |
if (soffset >= cut) |
82 | 116 |
break; /* we've gone far enough */ |
72 | 117 |
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postend = offset; |
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119 |
if (!safeadd(s->start, &postend) || |
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120 |
!safeadd(s->len, &postend)) { |
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121 |
break; |
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122 |
} |
72 | 123 |
if (postend <= cut) { |
124 |
/* save this hunk */ |
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125 |
int tmp = s->start; |
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126 |
if (!safesub(s->end, &tmp)) { |
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127 |
break; |
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128 |
} |
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129 |
if (!safeadd(s->len, &tmp)) { |
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130 |
break; |
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131 |
} |
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132 |
if (!safeadd(tmp, &offset)) { |
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133 |
break; /* add would overflow, oh well */ |
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134 |
} |
72 | 135 |
*d++ = *s++; |
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136 |
} else { |
72 | 137 |
/* break up this hunk */ |
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138 |
c = cut; |
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139 |
if (!safesub(offset, &c)) { |
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140 |
break; |
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141 |
} |
72 | 142 |
if (s->end < c) |
143 |
c = s->end; |
|
144 |
l = cut - offset - s->start; |
|
145 |
if (s->len < l) |
|
146 |
l = s->len; |
|
147 |
||
148 |
offset += s->start + l - c; |
|
149 |
||
150 |
d->start = s->start; |
|
151 |
d->end = c; |
|
152 |
d->len = l; |
|
153 |
d->data = s->data; |
|
154 |
d++; |
|
155 |
s->start = c; |
|
156 |
s->len = s->len - l; |
|
157 |
s->data = s->data + l; |
|
158 |
||
82 | 159 |
break; |
72 | 160 |
} |
161 |
} |
|
162 |
||
163 |
dest->tail = d; |
|
164 |
src->head = s; |
|
165 |
return offset; |
|
166 |
} |
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167 |
||
168 |
/* like gather, but with no output list */ |
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169 |
static int discard(struct mpatch_flist *src, int cut, int offset) |
72 | 170 |
{ |
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171 |
struct mpatch_frag *s = src->head; |
72 | 172 |
int postend, c, l; |
173 |
||
174 |
while (s != src->tail) { |
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175 |
int cmpcut = s->start; |
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176 |
if (!safeadd(offset, &cmpcut)) { |
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177 |
break; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
178 |
} |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
179 |
if (cmpcut >= cut) |
82 | 180 |
break; |
72 | 181 |
|
38193
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
182 |
postend = offset; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
183 |
if (!safeadd(s->start, &postend)) { |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
184 |
break; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
185 |
} |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
186 |
if (!safeadd(s->len, &postend)) { |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
187 |
break; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
188 |
} |
72 | 189 |
if (postend <= cut) { |
38193
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
190 |
/* do the subtraction first to avoid UB integer overflow |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
191 |
*/ |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
192 |
int tmp = s->start; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
193 |
if (!safesub(s->end, &tmp)) { |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
194 |
break; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
195 |
} |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
196 |
if (!safeadd(s->len, &tmp)) { |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
197 |
break; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
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diff
changeset
|
198 |
} |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
199 |
if (!safeadd(tmp, &offset)) { |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
200 |
break; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
201 |
} |
72 | 202 |
s++; |
34634
2e08b69bcd29
mpatch: reflow two oddly formatted else blocks with clang-format
Augie Fackler <augie@google.com>
parents:
34633
diff
changeset
|
203 |
} else { |
38193
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
204 |
c = cut; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
205 |
if (!safesub(offset, &c)) { |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
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parents:
38192
diff
changeset
|
206 |
break; |
7f22ef3c0ee7
mpatch: fix UB integer overflows in discard() (SEC)
Augie Fackler <augie@google.com>
parents:
38192
diff
changeset
|
207 |
} |
72 | 208 |
if (s->end < c) |
209 |
c = s->end; |
|
210 |
l = cut - offset - s->start; |
|
211 |
if (s->len < l) |
|
212 |
l = s->len; |
|
213 |
||
214 |
offset += s->start + l - c; |
|
215 |
s->start = c; |
|
216 |
s->len = s->len - l; |
|
217 |
s->data = s->data + l; |
|
218 |
||
82 | 219 |
break; |
72 | 220 |
} |
221 |
} |
|
222 |
||
223 |
src->head = s; |
|
224 |
return offset; |
|
225 |
} |
|
226 |
||
227 |
/* combine hunk lists a and b, while adjusting b for offset changes in a/ |
|
228 |
this deletes a and b and returns the resultant list. */ |
|
29692
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diff
changeset
|
229 |
static struct mpatch_flist *combine(struct mpatch_flist *a, |
34800
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|
230 |
struct mpatch_flist *b) |
72 | 231 |
{ |
29692
6b3a8d034b69
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parents:
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diff
changeset
|
232 |
struct mpatch_flist *c = NULL; |
6b3a8d034b69
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parents:
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diff
changeset
|
233 |
struct mpatch_frag *bh, *ct; |
72 | 234 |
int offset = 0, post; |
235 |
||
128 | 236 |
if (a && b) |
237 |
c = lalloc((lsize(a) + lsize(b)) * 2); |
|
238 |
||
239 |
if (c) { |
|
72 | 240 |
|
128 | 241 |
for (bh = b->head; bh != b->tail; bh++) { |
242 |
/* save old hunks */ |
|
243 |
offset = gather(c, a, bh->start, offset); |
|
72 | 244 |
|
128 | 245 |
/* discard replaced hunks */ |
246 |
post = discard(a, bh->end, offset); |
|
72 | 247 |
|
128 | 248 |
/* insert new hunk */ |
249 |
ct = c->tail; |
|
38195
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
250 |
ct->start = bh->start; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
251 |
ct->end = bh->end; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
252 |
if (!safesub(offset, &(ct->start)) || |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
253 |
!safesub(post, &(ct->end))) { |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
254 |
/* It was already possible to exit |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
255 |
* this function with a return value |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
256 |
* of NULL before the safesub()s were |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
257 |
* added, so this should be fine. */ |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
258 |
mpatch_lfree(c); |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
259 |
c = NULL; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
260 |
goto done; |
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
261 |
} |
128 | 262 |
ct->len = bh->len; |
263 |
ct->data = bh->data; |
|
264 |
c->tail++; |
|
265 |
offset = post; |
|
266 |
} |
|
267 |
||
268 |
/* hold on to tail from a */ |
|
29692
6b3a8d034b69
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Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
269 |
memcpy(c->tail, a->head, sizeof(struct mpatch_frag) * lsize(a)); |
128 | 270 |
c->tail += lsize(a); |
72 | 271 |
} |
38195
9c5ced5276d6
mpatch: avoid integer overflow in combine() (SEC)
Augie Fackler <augie@google.com>
parents:
38194
diff
changeset
|
272 |
done: |
29692
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
273 |
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
|
274 |
mpatch_lfree(b); |
72 | 275 |
return c; |
276 |
} |
|
277 |
||
278 |
/* 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
|
279 |
int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res) |
72 | 280 |
{ |
29692
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
281 |
struct mpatch_flist *l; |
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
282 |
struct mpatch_frag *lt; |
20167
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
283 |
int pos = 0; |
72 | 284 |
|
285 |
/* 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
|
286 |
l = lalloc(len / 12 + 1); |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
287 |
if (!l) |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
288 |
return MPATCH_ERR_NO_MEM; |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
289 |
|
72 | 290 |
lt = l->tail; |
291 |
||
38187
90a274965de7
mpatch: be more careful about parsing binary patch data (SEC)
Augie Fackler <augie@google.com>
parents:
34801
diff
changeset
|
292 |
/* 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
|
293 |
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
|
294 |
while (pos >= 0 && pos < (len - 11)) { |
20167
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
295 |
lt->start = getbe32(bin + pos); |
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
296 |
lt->end = getbe32(bin + pos + 4); |
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
297 |
lt->len = getbe32(bin + pos + 8); |
38194
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
298 |
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
|
299 |
break; /* sanity check */ |
38194
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
300 |
if (!safeadd(12, &pos)) { |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
301 |
break; |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
302 |
} |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
303 |
lt->data = bin + pos; |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
304 |
if (!safeadd(lt->len, &pos)) { |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
305 |
break; |
59837a16896d
mpatch: avoid integer overflow in mpatch_decode (SEC)
Augie Fackler <augie@google.com>
parents:
38193
diff
changeset
|
306 |
} |
72 | 307 |
lt++; |
308 |
} |
|
309 |
||
20167
09e41ac6289d
mpatch: rewrite pointer overflow checks
Matt Mackall <mpm@selenic.com>
parents:
16758
diff
changeset
|
310 |
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
|
311 |
mpatch_lfree(l); |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
312 |
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
|
313 |
} |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
314 |
|
72 | 315 |
l->tail = lt; |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
316 |
*res = l; |
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
317 |
return 0; |
72 | 318 |
} |
319 |
||
320 |
/* calculate the size of resultant text */ |
|
29693
b9b9f9a92481
mpatch: split mpatch into two files
Maciej Fijalkowski <fijall@gmail.com>
parents:
29692
diff
changeset
|
321 |
ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l) |
72 | 322 |
{ |
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
|
323 |
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
|
324 |
struct mpatch_frag *f = l->head; |
72 | 325 |
|
326 |
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
|
327 |
if (f->start < last || f->end > len) { |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
328 |
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
|
329 |
} |
72 | 330 |
outlen += f->start - last; |
331 |
last = f->end; |
|
332 |
outlen += f->len; |
|
333 |
f++; |
|
334 |
} |
|
335 |
||
336 |
outlen += len - last; |
|
337 |
return outlen; |
|
338 |
} |
|
339 |
||
29693
b9b9f9a92481
mpatch: split mpatch into two files
Maciej Fijalkowski <fijall@gmail.com>
parents:
29692
diff
changeset
|
340 |
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
|
341 |
struct mpatch_flist *l) |
72 | 342 |
{ |
29692
6b3a8d034b69
mpatch: provide things that will be exported later with a prefixed name
Maciej Fijalkowski <fijall@gmail.com>
parents:
29691
diff
changeset
|
343 |
struct mpatch_frag *f = l->head; |
72 | 344 |
int last = 0; |
345 |
char *p = buf; |
|
346 |
||
347 |
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
|
348 |
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
|
349 |
last < 0) { |
29694
55dd12204b8e
mpatch: remove dependency on Python.h in mpatch.c
Maciej Fijalkowski <fijall@gmail.com>
parents:
29693
diff
changeset
|
350 |
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
|
351 |
} |
72 | 352 |
memcpy(p, orig + last, f->start - last); |
353 |
p += f->start - last; |
|
354 |
memcpy(p, f->data, f->len); |
|
355 |
last = f->end; |
|
356 |
p += f->len; |
|
357 |
f++; |
|
358 |
} |
|
38188
1acfc35d478c
mpatch: protect against underflow in mpatch_apply (SEC)
Augie Fackler <augie@google.com>
parents:
38187
diff
changeset
|
359 |
if (last < 0) { |
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360 |
return MPATCH_ERR_INVALID_PATCH; |
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361 |
} |
72 | 362 |
memcpy(p, orig + last, len - last); |
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parents:
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363 |
return 0; |
72 | 364 |
} |
365 |
||
366 |
/* recursively generate a patch of all bins between start and end */ |
|
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367 |
struct mpatch_flist * |
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368 |
mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t), |
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ssize_t start, ssize_t end) |
72 | 370 |
{ |
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371 |
ssize_t len; |
72 | 372 |
|
373 |
if (start + 1 == end) { |
|
374 |
/* trivial case, output a decoded list */ |
|
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parents:
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375 |
return get_next_item(bins, start); |
72 | 376 |
} |
377 |
||
378 |
/* divide and conquer, memory management is elsewhere */ |
|
379 |
len = (end - start) / 2; |
|
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parents:
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380 |
return combine(mpatch_fold(bins, get_next_item, start, start + len), |
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381 |
mpatch_fold(bins, get_next_item, start + len, end)); |
72 | 382 |
} |