author | Matt Mackall <mpm@selenic.com> |
Sun, 17 Sep 2006 16:13:34 -0500 | |
changeset 3107 | 4ec28446fca8 |
parent 2858 | 345bac2bc4ec |
child 3138 | cc856c4d91ca |
permissions | -rw-r--r-- |
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/* |
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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 <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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/* msvc 6.0 has problems */ |
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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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/* not windows */ |
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# include <sys/types.h> |
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# include <arpa/inet.h> |
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# include <inttypes.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 = (struct flist *)malloc(sizeof(struct flist)); |
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if (a) { |
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a->base = (struct frag *)malloc(sizeof(struct 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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a = NULL; |
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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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} |
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static void lfree(struct 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 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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{ |
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struct frag *d = dest->tail, *s = src->head; |
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int postend, c, l; |
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while (s != src->tail) { |
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if (s->start + offset >= cut) |
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break; /* we've gone far enough */ |
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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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offset += s->start + l - c; |
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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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break; |
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} |
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} |
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dest->tail = d; |
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src->head = s; |
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return offset; |
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} |
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/* 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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while (s != src->tail) { |
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if (s->start + offset >= cut) |
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break; |
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postend = offset + s->start + s->len; |
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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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offset += s->start + l - c; |
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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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break; |
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} |
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} |
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src->head = s; |
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return offset; |
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} |
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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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struct flist *c = NULL; |
181 |
struct frag *bh, *ct; |
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int offset = 0, post; |
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if (a && b) |
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c = lalloc((lsize(a) + lsize(b)) * 2); |
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if (c) { |
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for (bh = b->head; bh != b->tail; bh++) { |
190 |
/* save old hunks */ |
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offset = gather(c, a, bh->start, offset); |
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/* discard replaced hunks */ |
194 |
post = discard(a, bh->end, offset); |
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/* insert new hunk */ |
197 |
ct = c->tail; |
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198 |
ct->start = bh->start - offset; |
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199 |
ct->end = bh->end - post; |
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200 |
ct->len = bh->len; |
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ct->data = bh->data; |
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202 |
c->tail++; |
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203 |
offset = post; |
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} |
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205 |
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206 |
/* 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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} |
210 |
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211 |
lfree(a); |
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212 |
lfree(b); |
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return c; |
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} |
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215 |
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216 |
/* decode a binary patch into a hunk list */ |
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217 |
static struct flist *decode(char *bin, int len) |
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{ |
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219 |
struct flist *l; |
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220 |
struct frag *lt; |
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char *end = bin + len; |
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char decode[12]; /* for dealing with alignment issues */ |
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224 |
/* 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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lt = l->tail; |
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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)); |
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lt->data = bin + 12; |
237 |
bin += 12 + lt->len; |
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238 |
lt++; |
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239 |
} |
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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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l->tail = lt; |
249 |
return l; |
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250 |
} |
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251 |
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252 |
/* calculate the size of resultant text */ |
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253 |
static int calcsize(int len, struct flist *l) |
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254 |
{ |
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255 |
int outlen = 0, last = 0; |
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256 |
struct frag *f = l->head; |
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257 |
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258 |
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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264 |
} |
72 | 265 |
outlen += f->start - last; |
266 |
last = f->end; |
|
267 |
outlen += f->len; |
|
268 |
f++; |
|
269 |
} |
|
270 |
||
271 |
outlen += len - last; |
|
272 |
return outlen; |
|
273 |
} |
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274 |
||
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275 |
static int apply(char *buf, char *orig, int len, struct flist *l) |
72 | 276 |
{ |
277 |
struct frag *f = l->head; |
|
278 |
int last = 0; |
|
279 |
char *p = buf; |
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280 |
||
281 |
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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287 |
} |
72 | 288 |
memcpy(p, orig + last, f->start - last); |
289 |
p += f->start - last; |
|
290 |
memcpy(p, f->data, f->len); |
|
291 |
last = f->end; |
|
292 |
p += f->len; |
|
293 |
f++; |
|
294 |
} |
|
295 |
memcpy(p, orig + last, len - last); |
|
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
296 |
return 1; |
72 | 297 |
} |
298 |
||
299 |
/* recursively generate a patch of all bins between start and end */ |
|
300 |
static struct flist *fold(PyObject *bins, int start, int end) |
|
301 |
{ |
|
302 |
int len; |
|
303 |
||
304 |
if (start + 1 == end) { |
|
305 |
/* trivial case, output a decoded list */ |
|
306 |
PyObject *tmp = PyList_GetItem(bins, start); |
|
128 | 307 |
if (!tmp) |
308 |
return NULL; |
|
72 | 309 |
return decode(PyString_AsString(tmp), PyString_Size(tmp)); |
310 |
} |
|
311 |
||
312 |
/* divide and conquer, memory management is elsewhere */ |
|
313 |
len = (end - start) / 2; |
|
314 |
return combine(fold(bins, start, start + len), |
|
315 |
fold(bins, start + len, end)); |
|
316 |
} |
|
317 |
||
318 |
static PyObject * |
|
319 |
patches(PyObject *self, PyObject *args) |
|
320 |
{ |
|
321 |
PyObject *text, *bins, *result; |
|
322 |
struct flist *patch; |
|
323 |
char *in, *out; |
|
324 |
int len, outlen; |
|
325 |
||
128 | 326 |
if (!PyArg_ParseTuple(args, "SO:mpatch", &text, &bins)) |
72 | 327 |
return NULL; |
328 |
||
329 |
len = PyList_Size(bins); |
|
330 |
if (!len) { |
|
331 |
/* nothing to do */ |
|
332 |
Py_INCREF(text); |
|
333 |
return text; |
|
334 |
} |
|
335 |
||
336 |
patch = fold(bins, 0, len); |
|
128 | 337 |
if (!patch) |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
338 |
return NULL; |
128 | 339 |
|
72 | 340 |
outlen = calcsize(PyString_Size(text), patch); |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
341 |
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
|
342 |
result = NULL; |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
343 |
goto cleanup; |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
344 |
} |
72 | 345 |
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
|
346 |
if (!result) { |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
347 |
result = NULL; |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
348 |
goto cleanup; |
128 | 349 |
} |
1722
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
350 |
in = PyString_AsString(text); |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
351 |
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
|
352 |
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
|
353 |
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
|
354 |
result = NULL; |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
355 |
} |
681c5c211b92
catch errors and throw exception with invalid binary patch data
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
597
diff
changeset
|
356 |
cleanup: |
72 | 357 |
lfree(patch); |
358 |
return result; |
|
359 |
} |
|
360 |
||
2078
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
361 |
/* calculate size of a patched file directly */ |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
362 |
static PyObject * |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
363 |
patchedsize(PyObject *self, PyObject *args) |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
364 |
{ |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
365 |
long orig, start, end, len, outlen = 0, last = 0; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
366 |
int patchlen; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
367 |
char *bin, *binend; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
368 |
char decode[12]; /* for dealing with alignment issues */ |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
369 |
|
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
370 |
if (!PyArg_ParseTuple(args, "ls#", &orig, &bin, &patchlen)) |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
371 |
return NULL; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
372 |
|
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
373 |
binend = bin + patchlen; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
374 |
|
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
375 |
while (bin < binend) { |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
376 |
memcpy(decode, bin, 12); |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
377 |
start = ntohl(*(uint32_t *)decode); |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
378 |
end = ntohl(*(uint32_t *)(decode + 4)); |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
379 |
len = ntohl(*(uint32_t *)(decode + 8)); |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
380 |
bin += 12 + len; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
381 |
outlen += start - last; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
382 |
last = end; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
383 |
outlen += len; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
384 |
} |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
385 |
|
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
386 |
if (bin != binend) { |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
387 |
if (!PyErr_Occurred()) |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
388 |
PyErr_SetString(mpatch_Error, "patch cannot be decoded"); |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
389 |
return NULL; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
390 |
} |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
391 |
|
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
392 |
outlen += orig - last; |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
393 |
return Py_BuildValue("l", outlen); |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
394 |
} |
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
395 |
|
72 | 396 |
static PyMethodDef methods[] = { |
397 |
{"patches", patches, METH_VARARGS, "apply a series of patches\n"}, |
|
2078
441ea218414e
Fill in the uncompressed size during revlog.addgroup
mason@suse.com
parents:
1978
diff
changeset
|
398 |
{"patchedsize", patchedsize, METH_VARARGS, "calculed patched size\n"}, |
72 | 399 |
{NULL, NULL} |
400 |
}; |
|
401 |
||
402 |
PyMODINIT_FUNC |
|
403 |
initmpatch(void) |
|
404 |
{ |
|
405 |
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
|
406 |
mpatch_Error = PyErr_NewException("mpatch.mpatchError", NULL, NULL); |
72 | 407 |
} |
408 |