author | Shun-ichi GOTO <shunichi.goto@gmail.com> |
Fri, 17 Mar 2006 17:23:52 -0800 | |
changeset 1970 | 119165543ce6 |
parent 1746 | 299c3e26ee45 |
child 1978 | 10606ee61107 |
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 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 <Python.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#ifdef _WIN32 |
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#ifdef _MSC_VER |
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#define inline __inline |
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typedef unsigned long uint32_t; |
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#else |
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#include <stdint.h> |
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#endif |
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static uint32_t ntohl(uint32_t x) |
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{ |
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return ((x & 0x000000ffUL) << 24) | |
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((x & 0x0000ff00UL) << 8) | |
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((x & 0x00ff0000UL) >> 8) | |
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((x & 0xff000000UL) >> 24); |
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} |
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#else |
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#include <sys/types.h> |
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#include <arpa/inet.h> |
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#endif |
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static char mpatch_doc[] = "Efficient binary patching."; |
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static PyObject *mpatch_Error; |
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struct frag { |
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int start, end, len; |
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char *data; |
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}; |
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struct flist { |
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struct frag *base, *head, *tail; |
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}; |
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static struct flist *lalloc(int size) |
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{ |
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struct flist *a = NULL; |
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a = malloc(sizeof(struct flist)); |
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if (a) { |
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a->base = malloc(sizeof(struct frag) * size); |
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if (!a->base) { |
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free(a); |
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a = NULL; |
67 |
} else |
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a->head = a->tail = a->base; |
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return a; |
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} |
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if (!PyErr_Occurred()) |
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PyErr_NoMemory(); |
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return NULL; |
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} |
75 |
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static void lfree(struct flist *a) |
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{ |
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128 | 78 |
if (a) { |
79 |
free(a->base); |
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free(a); |
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} |
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72 | 82 |
} |
83 |
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84 |
static int lsize(struct flist *a) |
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{ |
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return a->tail - a->head; |
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} |
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/* move hunks in source that are less cut to dest, compensating |
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for changes in offset. the last hunk may be split if necessary. |
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*/ |
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static int gather(struct flist *dest, struct flist *src, int cut, int offset) |
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93 |
{ |
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94 |
struct frag *d = dest->tail, *s = src->head; |
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int postend, c, l; |
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96 |
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97 |
while (s != src->tail) { |
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if (s->start + offset >= cut) |
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break; /* we've gone far enough */ |
72 | 100 |
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postend = offset + s->start + s->len; |
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if (postend <= cut) { |
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/* save this hunk */ |
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offset += s->start + s->len - s->end; |
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*d++ = *s++; |
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} |
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else { |
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/* break up this hunk */ |
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c = cut - offset; |
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if (s->end < c) |
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c = s->end; |
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l = cut - offset - s->start; |
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if (s->len < l) |
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l = s->len; |
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115 |
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116 |
offset += s->start + l - c; |
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117 |
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d->start = s->start; |
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d->end = c; |
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d->len = l; |
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d->data = s->data; |
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d++; |
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s->start = c; |
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s->len = s->len - l; |
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s->data = s->data + l; |
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126 |
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82 | 127 |
break; |
72 | 128 |
} |
129 |
} |
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130 |
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131 |
dest->tail = d; |
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src->head = s; |
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return offset; |
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} |
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135 |
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136 |
/* like gather, but with no output list */ |
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static int discard(struct flist *src, int cut, int offset) |
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{ |
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struct frag *s = src->head; |
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int postend, c, l; |
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141 |
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142 |
while (s != src->tail) { |
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if (s->start + offset >= cut) |
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break; |
72 | 145 |
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146 |
postend = offset + s->start + s->len; |
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147 |
if (postend <= cut) { |
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offset += s->start + s->len - s->end; |
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s++; |
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} |
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else { |
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c = cut - offset; |
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if (s->end < c) |
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c = s->end; |
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l = cut - offset - s->start; |
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if (s->len < l) |
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l = s->len; |
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158 |
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159 |
offset += s->start + l - c; |
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s->start = c; |
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161 |
s->len = s->len - l; |
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162 |
s->data = s->data + l; |
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163 |
||
82 | 164 |
break; |
72 | 165 |
} |
166 |
} |
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167 |
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168 |
src->head = s; |
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return offset; |
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} |
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171 |
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/* combine hunk lists a and b, while adjusting b for offset changes in a/ |
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this deletes a and b and returns the resultant list. */ |
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static struct flist *combine(struct flist *a, struct flist *b) |
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{ |
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128 | 176 |
struct flist *c = NULL; |
177 |
struct frag *bh, *ct; |
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72 | 178 |
int offset = 0, post; |
179 |
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128 | 180 |
if (a && b) |
181 |
c = lalloc((lsize(a) + lsize(b)) * 2); |
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182 |
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183 |
if (c) { |
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72 | 184 |
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128 | 185 |
for (bh = b->head; bh != b->tail; bh++) { |
186 |
/* save old hunks */ |
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offset = gather(c, a, bh->start, offset); |
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72 | 188 |
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128 | 189 |
/* discard replaced hunks */ |
190 |
post = discard(a, bh->end, offset); |
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/* insert new hunk */ |
193 |
ct = c->tail; |
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ct->start = bh->start - offset; |
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ct->end = bh->end - post; |
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ct->len = bh->len; |
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ct->data = bh->data; |
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c->tail++; |
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offset = post; |
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} |
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/* hold on to tail from a */ |
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memcpy(c->tail, a->head, sizeof(struct frag) * lsize(a)); |
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c->tail += lsize(a); |
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} |
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lfree(a); |
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lfree(b); |
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return c; |
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} |
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211 |
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/* decode a binary patch into a hunk list */ |
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static struct flist *decode(char *bin, int len) |
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{ |
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215 |
struct flist *l; |
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struct frag *lt; |
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char *end = bin + len; |
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char decode[12]; /* for dealing with alignment issues */ |
72 | 219 |
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/* assume worst case size, we won't have many of these lists */ |
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l = lalloc(len / 12); |
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if (!l) |
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return NULL; |
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72 | 225 |
lt = l->tail; |
226 |
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while (bin < end) { |
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memcpy(decode, bin, 12); |
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lt->start = ntohl(*(uint32_t *)decode); |
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lt->end = ntohl(*(uint32_t *)(decode + 4)); |
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lt->len = ntohl(*(uint32_t *)(decode + 8)); |
72 | 232 |
lt->data = bin + 12; |
233 |
bin += 12 + lt->len; |
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234 |
lt++; |
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235 |
} |
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if (bin != end) { |
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if (!PyErr_Occurred()) |
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PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
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lfree(l); |
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return NULL; |
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} |
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72 | 244 |
l->tail = lt; |
245 |
return l; |
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246 |
} |
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247 |
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248 |
/* calculate the size of resultant text */ |
|
249 |
static int calcsize(int len, struct flist *l) |
|
250 |
{ |
|
251 |
int outlen = 0, last = 0; |
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252 |
struct frag *f = l->head; |
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253 |
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254 |
while (f != l->tail) { |
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if (f->start < last || f->end > len) { |
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if (!PyErr_Occurred()) |
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PyErr_SetString(mpatch_Error, |
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"invalid patch"); |
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return -1; |
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} |
72 | 261 |
outlen += f->start - last; |
262 |
last = f->end; |
|
263 |
outlen += f->len; |
|
264 |
f++; |
|
265 |
} |
|
266 |
||
267 |
outlen += len - last; |
|
268 |
return outlen; |
|
269 |
} |
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static int apply(char *buf, char *orig, int len, struct flist *l) |
72 | 272 |
{ |
273 |
struct frag *f = l->head; |
|
274 |
int last = 0; |
|
275 |
char *p = buf; |
|
276 |
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277 |
while (f != l->tail) { |
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if (f->start < last || f->end > len) { |
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if (!PyErr_Occurred()) |
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PyErr_SetString(mpatch_Error, |
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"invalid patch"); |
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return 0; |
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283 |
} |
72 | 284 |
memcpy(p, orig + last, f->start - last); |
285 |
p += f->start - last; |
|
286 |
memcpy(p, f->data, f->len); |
|
287 |
last = f->end; |
|
288 |
p += f->len; |
|
289 |
f++; |
|
290 |
} |
|
291 |
memcpy(p, orig + last, len - last); |
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292 |
return 1; |
72 | 293 |
} |
294 |
||
295 |
/* recursively generate a patch of all bins between start and end */ |
|
296 |
static struct flist *fold(PyObject *bins, int start, int end) |
|
297 |
{ |
|
298 |
int len; |
|
299 |
||
300 |
if (start + 1 == end) { |
|
301 |
/* trivial case, output a decoded list */ |
|
302 |
PyObject *tmp = PyList_GetItem(bins, start); |
|
128 | 303 |
if (!tmp) |
304 |
return NULL; |
|
72 | 305 |
return decode(PyString_AsString(tmp), PyString_Size(tmp)); |
306 |
} |
|
307 |
||
308 |
/* divide and conquer, memory management is elsewhere */ |
|
309 |
len = (end - start) / 2; |
|
310 |
return combine(fold(bins, start, start + len), |
|
311 |
fold(bins, start + len, end)); |
|
312 |
} |
|
313 |
||
314 |
static PyObject * |
|
315 |
patches(PyObject *self, PyObject *args) |
|
316 |
{ |
|
317 |
PyObject *text, *bins, *result; |
|
318 |
struct flist *patch; |
|
319 |
char *in, *out; |
|
320 |
int len, outlen; |
|
321 |
||
128 | 322 |
if (!PyArg_ParseTuple(args, "SO:mpatch", &text, &bins)) |
72 | 323 |
return NULL; |
324 |
||
325 |
len = PyList_Size(bins); |
|
326 |
if (!len) { |
|
327 |
/* nothing to do */ |
|
328 |
Py_INCREF(text); |
|
329 |
return text; |
|
330 |
} |
|
331 |
||
332 |
patch = fold(bins, 0, len); |
|
128 | 333 |
if (!patch) |
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334 |
return NULL; |
128 | 335 |
|
72 | 336 |
outlen = calcsize(PyString_Size(text), patch); |
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|
337 |
if (outlen < 0) { |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
338 |
result = NULL; |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
339 |
goto cleanup; |
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 |
result = PyString_FromStringAndSize(NULL, outlen); |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
342 |
if (!result) { |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
343 |
result = NULL; |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
344 |
goto cleanup; |
128 | 345 |
} |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
346 |
in = PyString_AsString(text); |
681c5c211b92
catch errors and throw exception with invalid binary patch data
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parents:
597
diff
changeset
|
347 |
out = PyString_AsString(result); |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
348 |
if (!apply(out, in, PyString_Size(text), patch)) { |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
349 |
Py_DECREF(result); |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
350 |
result = NULL; |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
351 |
} |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
352 |
cleanup: |
72 | 353 |
lfree(patch); |
354 |
return result; |
|
355 |
} |
|
356 |
||
357 |
static PyMethodDef methods[] = { |
|
358 |
{"patches", patches, METH_VARARGS, "apply a series of patches\n"}, |
|
359 |
{NULL, NULL} |
|
360 |
}; |
|
361 |
||
362 |
PyMODINIT_FUNC |
|
363 |
initmpatch(void) |
|
364 |
{ |
|
365 |
Py_InitModule3("mpatch", methods, mpatch_doc); |
|
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
366 |
mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 367 |
} |
368 |