#include "cache.h"
#include "quote.h"
#include "blob.h"
+#include "delta.h"
// --check turns on checking that the working tree matches the
// files that are being modified, but doesn't apply the patch
//
static const char *prefix;
static int prefix_length = -1;
+static int newfd = -1;
static int p_value = 1;
static int allow_binary_replacement = 0;
static int no_add = 0;
static int show_index_info = 0;
static int line_termination = '\n';
+static unsigned long p_context = -1;
static const char apply_usage[] =
-"git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] [-pNUM] [--whitespace=<nowarn|warn|error|error-all|strip>] <patch>...";
+"git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] [-pNUM] [-
CNUM] [--whitespace=<nowarn|warn|error|error-all|strip>] <patch>...";
static enum whitespace_eol {
nowarn_whitespace,
static int linenr = 1;
struct fragment {
+ unsigned long leading, trailing;
unsigned long oldpos, oldlines;
unsigned long newpos, newlines;
const char *patch;
char *new_name, *old_name, *def_name;
unsigned int old_mode, new_mode;
int is_rename, is_copy, is_new, is_delete, is_binary;
+#define BINARY_DELTA_DEFLATED 1
+#define BINARY_LITERAL_DEFLATED 2
+ unsigned long deflate_origlen;
int lines_added, lines_deleted;
int score;
struct fragment *fragments;
int added, deleted;
int len = linelen(line, size), offset;
unsigned long oldlines, newlines;
+ unsigned long leading, trailing;
offset = parse_fragment_header(line, len, fragment);
if (offset < 0)
return -1;
oldlines = fragment->oldlines;
newlines = fragment->newlines;
+ leading = 0;
+ trailing = 0;
if (patch->is_new < 0) {
patch->is_new = !oldlines;
case ' ':
oldlines--;
newlines--;
+ if (!deleted && !added)
+ leading++;
+ trailing++;
break;
case '-':
deleted++;
oldlines--;
+ trailing = 0;
break;
case '+':
/*
}
added++;
newlines--;
+ trailing = 0;
break;
/* We allow "\ No newline at end of file". Depending
}
if (oldlines || newlines)
return -1;
+ fragment->leading = leading;
+ fragment->trailing = trailing;
+
/* If a fragment ends with an incomplete line, we failed to include
* it in the above loop because we hit oldlines == newlines == 0
* before seeing it.
struct fragment *fragment;
int len;
- fragment = xmalloc(sizeof(*fragment));
- memset(fragment, 0, sizeof(*fragment));
+ fragment = xcalloc(1, sizeof(*fragment));
len = parse_fragment(line, size, patch, fragment);
if (len <= 0)
die("corrupt patch at line %d", linenr);
patch->old_mode != patch->new_mode);
}
+static int parse_binary(char *buffer, unsigned long size, struct patch *patch)
+{
+ /* We have read "GIT binary patch\n"; what follows is a line
+ * that says the patch method (currently, either "deflated
+ * literal" or "deflated delta") and the length of data before
+ * deflating; a sequence of 'length-byte' followed by base-85
+ * encoded data follows.
+ *
+ * Each 5-byte sequence of base-85 encodes up to 4 bytes,
+ * and we would limit the patch line to 66 characters,
+ * so one line can fit up to 13 groups that would decode
+ * to 52 bytes max. The length byte 'A'-'Z' corresponds
+ * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
+ * The end of binary is signalled with an empty line.
+ */
+ int llen, used;
+ struct fragment *fragment;
+ char *data = NULL;
+
+ patch->fragments = fragment = xcalloc(1, sizeof(*fragment));
+
+ /* Grab the type of patch */
+ llen = linelen(buffer, size);
+ used = llen;
+ linenr++;
+
+ if (!strncmp(buffer, "delta ", 6)) {
+ patch->is_binary = BINARY_DELTA_DEFLATED;
+ patch->deflate_origlen = strtoul(buffer + 6, NULL, 10);
+ }
+ else if (!strncmp(buffer, "literal ", 8)) {
+ patch->is_binary = BINARY_LITERAL_DEFLATED;
+ patch->deflate_origlen = strtoul(buffer + 8, NULL, 10);
+ }
+ else
+ return error("unrecognized binary patch at line %d: %.*s",
+ linenr-1, llen-1, buffer);
+ buffer += llen;
+ while (1) {
+ int byte_length, max_byte_length, newsize;
+ llen = linelen(buffer, size);
+ used += llen;
+ linenr++;
+ if (llen == 1)
+ break;
+ /* Minimum line is "A00000\n" which is 7-byte long,
+ * and the line length must be multiple of 5 plus 2.
+ */
+ if ((llen < 7) || (llen-2) % 5)
+ goto corrupt;
+ max_byte_length = (llen - 2) / 5 * 4;
+ byte_length = *buffer;
+ if ('A' <= byte_length && byte_length <= 'Z')
+ byte_length = byte_length - 'A' + 1;
+ else if ('a' <= byte_length && byte_length <= 'z')
+ byte_length = byte_length - 'a' + 27;
+ else
+ goto corrupt;
+ /* if the input length was not multiple of 4, we would
+ * have filler at the end but the filler should never
+ * exceed 3 bytes
+ */
+ if (max_byte_length < byte_length ||
+ byte_length <= max_byte_length - 4)
+ goto corrupt;
+ newsize = fragment->size + byte_length;
+ data = xrealloc(data, newsize);
+ if (decode_85(data + fragment->size,
+ buffer + 1,
+ byte_length))
+ goto corrupt;
+ fragment->size = newsize;
+ buffer += llen;
+ size -= llen;
+ }
+ fragment->patch = data;
+ return used;
+ corrupt:
+ return error("corrupt binary patch at line %d: %.*s",
+ linenr-1, llen-1, buffer);
+}
+
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
{
int hdrsize, patchsize;
"Files ",
NULL,
};
+ static const char git_binary[] = "GIT binary patch\n";
int i;
int hd = hdrsize + offset;
unsigned long llen = linelen(buffer + hd, size - hd);
- if (!memcmp(" differ\n", buffer + hd + llen - 8, 8))
+ if (llen == sizeof(git_binary) - 1 &&
+ !memcmp(git_binary, buffer + hd, llen)) {
+ int used;
+ linenr++;
+ used = parse_binary(buffer + hd + llen,
+ size - hd - llen, patch);
+ if (used)
+ patchsize = used + llen;
+ else
+ patchsize = 0;
+ }
+ else if (!memcmp(" differ\n", buffer + hd + llen - 8, 8)) {
for (i = 0; binhdr[i]; i++) {
int len = strlen(binhdr[i]);
if (len < size - hd &&
!memcmp(binhdr[i], buffer + hd, len)) {
+ linenr++;
patch->is_binary = 1;
+ patchsize = llen;
break;
}
}
+ }
/* Empty patch cannot be applied if:
* - it is a binary patch and we do not do binary_replace, or
}
}
-static int find_offset(const char *buf, unsigned long size, const char *fragment, unsigned long fragsize, int line)
+static int find_offset(const char *buf, unsigned long size, const char *fragment, unsigned long fragsize, int line, int *lines)
{
int i;
unsigned long start, backwards, forwards;
n = (i >> 1)+1;
if (i & 1)
n = -n;
+ *lines = n;
return try;
}
return -1;
}
+static void remove_first_line(const char **rbuf, int *rsize)
+{
+ const char *buf = *rbuf;
+ int size = *rsize;
+ unsigned long offset;
+ offset = 0;
+ while (offset <= size) {
+ if (buf[offset++] == '\n')
+ break;
+ }
+ *rsize = size - offset;
+ *rbuf = buf + offset;
+}
+
+static void remove_last_line(const char **rbuf, int *rsize)
+{
+ const char *buf = *rbuf;
+ int size = *rsize;
+ unsigned long offset;
+ offset = size - 1;
+ while (offset > 0) {
+ if (buf[--offset] == '\n')
+ break;
+ }
+ *rsize = offset + 1;
+}
+
struct buffer_desc {
char *buffer;
unsigned long size;
int offset, size = frag->size;
char *old = xmalloc(size);
char *new = xmalloc(size);
+ const char *oldlines, *newlines;
int oldsize = 0, newsize = 0;
+ unsigned long leading, trailing;
+ int pos, lines;
while (size > 0) {
int len = linelen(patch, size);
newsize--;
}
#endif
-
- offset = find_offset(buf, desc->size, old, oldsize, frag->newpos);
- if (offset >= 0) {
- int diff = newsize - oldsize;
- unsigned long size = desc->size + diff;
- unsigned long alloc = desc->alloc;
-
- if (size > alloc) {
- alloc = size + 8192;
- desc->alloc = alloc;
- buf = xrealloc(buf, alloc);
- desc->buffer = buf;
+
+ oldlines = old;
+ newlines = new;
+ leading = frag->leading;
+ trailing = frag->trailing;
+ lines = 0;
+ pos = frag->newpos;
+ for (;;) {
+ offset = find_offset(buf, desc->size, oldlines, oldsize, pos, &lines);
+ if (offset >= 0) {
+ int diff = newsize - oldsize;
+ unsigned long size = desc->size + diff;
+ unsigned long alloc = desc->alloc;
+
+ /* Warn if it was necessary to reduce the number
+ * of context lines.
+ */
+ if ((leading != frag->leading) || (trailing != frag->trailing))
+ fprintf(stderr, "Context reduced to (%ld/%ld) to apply fragment at %d\n",
+ leading, trailing, pos + lines);
+
+ if (size > alloc) {
+ alloc = size + 8192;
+ desc->alloc = alloc;
+ buf = xrealloc(buf, alloc);
+ desc->buffer = buf;
+ }
+ desc->size = size;
+ memmove(buf + offset + newsize, buf + offset + oldsize, size - offset - newsize);
+ memcpy(buf + offset, newlines, newsize);
+ offset = 0;
+
+ break;
+ }
+
+ /* Am I at my context limits? */
+ if ((leading <= p_context) && (trailing <= p_context))
+ break;
+ /* Reduce the number of context lines
+ * Reduce both leading and trailing if they are equal
+ * otherwise just reduce the larger context.
+ */
+ if (leading >= trailing) {
+ remove_first_line(&oldlines, &oldsize);
+ remove_first_line(&newlines, &newsize);
+ pos--;
+ leading--;
+ }
+ if (trailing > leading) {
+ remove_last_line(&oldlines, &oldsize);
+ remove_last_line(&newlines, &newsize);
+ trailing--;
}
- desc->size = size;
- memmove(buf + offset + newsize, buf + offset + oldsize, size - offset - newsize);
- memcpy(buf + offset, new, newsize);
- offset = 0;
}
free(old);
return offset;
}
-static int apply_fragments(struct buffer_desc *desc, struct patch *patch)
+static char *inflate_it(const void *data, unsigned long size,
+ unsigned long inflated_size)
+{
+ z_stream stream;
+ void *out;
+ int st;
+
+ memset(&stream, 0, sizeof(stream));
+
+ stream.next_in = (unsigned char *)data;
+ stream.avail_in = size;
+ stream.next_out = out = xmalloc(inflated_size);
+ stream.avail_out = inflated_size;
+ inflateInit(&stream);
+ st = inflate(&stream, Z_FINISH);
+ if ((st != Z_STREAM_END) || stream.total_out != inflated_size) {
+ free(out);
+ return NULL;
+ }
+ return out;
+}
+
+static int apply_binary_fragment(struct buffer_desc *desc, struct patch *patch)
+{
+ unsigned long dst_size;
+ struct fragment *fragment = patch->fragments;
+ void *data;
+ void *result;
+
+ data = inflate_it(fragment->patch, fragment->size,
+ patch->deflate_origlen);
+ if (!data)
+ return error("corrupt patch data");
+ switch (patch->is_binary) {
+ case BINARY_DELTA_DEFLATED:
+ result = patch_delta(desc->buffer, desc->size,
+ data,
+ patch->deflate_origlen,
+ &dst_size);
+ free(desc->buffer);
+ desc->buffer = result;
+ free(data);
+ break;
+ case BINARY_LITERAL_DEFLATED:
+ free(desc->buffer);
+ desc->buffer = data;
+ dst_size = patch->deflate_origlen;
+ break;
+ }
+ if (!desc->buffer)
+ return -1;
+ desc->size = desc->alloc = dst_size;
+ return 0;
+}
+
+static int apply_binary(struct buffer_desc *desc, struct patch *patch)
{
- struct fragment *frag = patch->fragments;
const char *name = patch->old_name ? patch->old_name : patch->new_name;
+ unsigned char sha1[20];
+ unsigned char hdr[50];
+ int hdrlen;
- if (patch->is_binary) {
- unsigned char sha1[20];
+ if (!allow_binary_replacement)
+ return error("cannot apply binary patch to '%s' "
+ "without --allow-binary-replacement",
+ name);
- if (!allow_binary_replacement)
- return error("cannot apply binary patch to '%s' "
- "without --allow-binary-replacement",
- name);
+ /* For safety, we require patch index line to contain
+ * full 40-byte textual SHA1 for old and new, at least for now.
+ */
+ if (strlen(patch->old_sha1_prefix) != 40 ||
+ strlen(patch->new_sha1_prefix) != 40 ||
+ get_sha1_hex(patch->old_sha1_prefix, sha1) ||
+ get_sha1_hex(patch->new_sha1_prefix, sha1))
+ return error("cannot apply binary patch to '%s' "
+ "without full index line", name);
- /* For safety, we require patch index line to contain
- * full 40-byte textual SHA1 for old and new, at least for now.
+ if (patch->old_name) {
+ /* See if the old one matches what the patch
+ * applies to.
*/
- if (strlen(patch->old_sha1_prefix) != 40 ||
- strlen(patch->new_sha1_prefix) != 40 ||
- get_sha1_hex(patch->old_sha1_prefix, sha1) ||
- get_sha1_hex(patch->new_sha1_prefix, sha1))
- return error("cannot apply binary patch to '%s' "
- "without full index line", name);
-
- if (patch->old_name) {
- unsigned char hdr[50];
- int hdrlen;
-
- /* See if the old one matches what the patch
- * applies to.
- */
- write_sha1_file_prepare(desc->buffer, desc->size,
- blob_type, sha1, hdr, &hdrlen);
- if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
- return error("the patch applies to '%s' (%s), "
- "which does not match the "
- "current contents.",
- name, sha1_to_hex(sha1));
- }
- else {
- /* Otherwise, the old one must be empty. */
- if (desc->size)
- return error("the patch applies to an empty "
- "'%s' but it is not empty", name);
- }
+ write_sha1_file_prepare(desc->buffer, desc->size,
+ blob_type, sha1, hdr, &hdrlen);
+ if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
+ return error("the patch applies to '%s' (%s), "
+ "which does not match the "
+ "current contents.",
+ name, sha1_to_hex(sha1));
+ }
+ else {
+ /* Otherwise, the old one must be empty. */
+ if (desc->size)
+ return error("the patch applies to an empty "
+ "'%s' but it is not empty", name);
+ }
+
+ get_sha1_hex(patch->new_sha1_prefix, sha1);
+ if (!memcmp(sha1, null_sha1, 20)) {
+ free(desc->buffer);
+ desc->alloc = desc->size = 0;
+ desc->buffer = NULL;
+ return 0; /* deletion patch */
+ }
+
+ if (has_sha1_file(sha1)) {
+ /* We already have the postimage */
+ char type[10];
+ unsigned long size;
- /* For now, we do not record post-image data in the patch,
- * and require the object already present in the recipient's
- * object database.
+ free(desc->buffer);
+ desc->buffer = read_sha1_file(sha1, type, &size);
+ if (!desc->buffer)
+ return error("the necessary postimage %s for "
+ "'%s' cannot be read",
+ patch->new_sha1_prefix, name);
+ desc->alloc = desc->size = size;
+ }
+ else {
+ /* We have verified desc matches the preimage;
+ * apply the patch data to it, which is stored
+ * in the patch->fragments->{patch,size}.
*/
- if (desc->buffer) {
- free(desc->buffer);
- desc->alloc = desc->size = 0;
- }
- get_sha1_hex(patch->new_sha1_prefix, sha1);
-
- if (memcmp(sha1, null_sha1, 20)) {
- char type[10];
- unsigned long size;
-
- desc->buffer = read_sha1_file(sha1, type, &size);
- if (!desc->buffer)
- return error("the necessary postimage %s for "
- "'%s' does not exist",
- patch->new_sha1_prefix, name);
- desc->alloc = desc->size = size;
- }
+ if (apply_binary_fragment(desc, patch))
+ return error("binary patch does not apply to '%s'",
+ name);
- return 0;
+ /* verify that the result matches */
+ write_sha1_file_prepare(desc->buffer, desc->size, blob_type,
+ sha1, hdr, &hdrlen);
+ if (strcmp(sha1_to_hex(sha1), patch->new_sha1_prefix))
+ return error("binary patch to '%s' creates incorrect result", name);
}
+ return 0;
+}
+
+static int apply_fragments(struct buffer_desc *desc, struct patch *patch)
+{
+ struct fragment *frag = patch->fragments;
+ const char *name = patch->old_name ? patch->old_name : patch->new_name;
+
+ if (patch->is_binary)
+ return apply_binary(desc, patch);
+
while (frag) {
if (apply_one_fragment(desc, frag) < 0)
return error("patch failed: %s:%ld",
if (!write_index)
return;
- ce = xmalloc(ce_size);
- memset(ce, 0, ce_size);
+ ce = xcalloc(1, ce_size);
memcpy(ce->name, path, namelen);
ce->ce_mode = create_ce_mode(mode);
ce->ce_flags = htons(namelen);
static int apply_patch(int fd, const char *filename)
{
- int newfd;
unsigned long offset, size;
char *buffer = read_patch_file(fd, &size);
struct patch *list = NULL, **listp = &list;
struct patch *patch;
int nr;
- patch = xmalloc(sizeof(*patch));
- memset(patch, 0, sizeof(*patch));
+ patch = xcalloc(1, sizeof(*patch));
nr = parse_chunk(buffer + offset, size, patch);
if (nr < 0)
break;
size -= nr;
}
- newfd = -1;
if (whitespace_error && (new_whitespace == error_on_whitespace))
apply = 0;
write_index = check_index && apply;
- if (write_index)
+ if (write_index && newfd < 0)
newfd = hold_index_file_for_update(&cache_file, get_index_file());
if (check_index) {
if (read_cache() < 0)
if (apply)
write_out_results(list, skipped_patch);
- if (write_index) {
- if (write_cache(newfd, active_cache, active_nr) ||
- commit_index_file(&cache_file))
- die("Unable to write new cachefile");
- }
-
if (show_index_info)
show_index_list(list);
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
+ char *end;
int fd;
if (!strcmp(arg, "-")) {
diffstat = 1;
continue;
}
- if (!strcmp(arg, "--allow-binary-replacement")) {
+ if (!strcmp(arg, "--allow-binary-replacement") ||
+ !strcmp(arg, "--binary")) {
allow_binary_replacement = 1;
continue;
}
line_termination = 0;
continue;
}
+ if (!strncmp(arg, "-C", 2)) {
+ p_context = strtoul(arg + 2, &end, 0);
+ if (*end != '\0')
+ die("unrecognized context count '%s'", arg + 2);
+ continue;
+ }
if (!strncmp(arg, "--whitespace=", 13)) {
whitespace_option = arg + 13;
parse_whitespace_option(arg + 13);
whitespace_error == 1 ? "" : "s",
whitespace_error == 1 ? "s" : "");
}
+
+ if (write_index) {
+ if (write_cache(newfd, active_cache, active_nr) ||
+ commit_index_file(&cache_file))
+ die("Unable to write new cachefile");
+ }
+
return 0;
}