#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;
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;
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
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 */
+ }
- /* For now, we do not record post-image data in the patch,
- * and require the object already present in the recipient's
- * object database.
+ if (has_sha1_file(sha1)) {
+ /* We already have the postimage */
+ char type[10];
+ unsigned long size;
+
+ 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",
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;
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);
diffstat = 1;
continue;
}
- if (!strcmp(arg, "--allow-binary-replacement")) {
+ if (!strcmp(arg, "--allow-binary-replacement") ||
+ !strcmp(arg, "--binary")) {
allow_binary_replacement = 1;
continue;
}
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;
}
#include "quote.h"
#include "diff.h"
#include "diffcore.h"
+ #include "delta.h"
#include "xdiff-interface.h"
static int use_size_cache;
static void show_stats(struct diffstat_t* data)
{
- char *prefix = "";
int i, len, add, del, total, adds = 0, dels = 0;
int max, max_change = 0, max_len = 0;
int total_files = data->nr;
}
for (i = 0; i < data->nr; i++) {
+ char *prefix = "";
char *name = data->files[i]->name;
int added = data->files[i]->added;
int deleted = data->files[i]->deleted;
total_files, adds, dels);
}
+ static unsigned char *deflate_it(char *data,
+ unsigned long size,
+ unsigned long *result_size)
+ {
+ int bound;
+ unsigned char *deflated;
+ z_stream stream;
+
+ memset(&stream, 0, sizeof(stream));
+ deflateInit(&stream, Z_BEST_COMPRESSION);
+ bound = deflateBound(&stream, size);
+ deflated = xmalloc(bound);
+ stream.next_out = deflated;
+ stream.avail_out = bound;
+
+ stream.next_in = (unsigned char *)data;
+ stream.avail_in = size;
+ while (deflate(&stream, Z_FINISH) == Z_OK)
+ ; /* nothing */
+ deflateEnd(&stream);
+ *result_size = stream.total_out;
+ return deflated;
+ }
+
+ static void emit_binary_diff(mmfile_t *one, mmfile_t *two)
+ {
+ void *cp;
+ void *delta;
+ void *deflated;
+ void *data;
+ unsigned long orig_size;
+ unsigned long delta_size;
+ unsigned long deflate_size;
+ unsigned long data_size;
+
+ printf("GIT binary patch\n");
+ /* We could do deflated delta, or we could do just deflated two,
+ * whichever is smaller.
+ */
+ delta = NULL;
+ deflated = deflate_it(two->ptr, two->size, &deflate_size);
+ if (one->size && two->size) {
+ delta = diff_delta(one->ptr, one->size,
+ two->ptr, two->size,
+ &delta_size, deflate_size);
+ if (delta) {
+ void *to_free = delta;
+ orig_size = delta_size;
+ delta = deflate_it(delta, delta_size, &delta_size);
+ free(to_free);
+ }
+ }
+
+ if (delta && delta_size < deflate_size) {
+ printf("delta %lu\n", orig_size);
+ free(deflated);
+ data = delta;
+ data_size = delta_size;
+ }
+ else {
+ printf("literal %lu\n", two->size);
+ free(delta);
+ data = deflated;
+ data_size = deflate_size;
+ }
+
+ /* emit data encoded in base85 */
+ cp = data;
+ while (data_size) {
+ int bytes = (52 < data_size) ? 52 : data_size;
+ char line[70];
+ data_size -= bytes;
+ if (bytes <= 26)
+ line[0] = bytes + 'A' - 1;
+ else
+ line[0] = bytes - 26 + 'a' - 1;
+ encode_85(line + 1, cp, bytes);
+ cp += bytes;
+ puts(line);
+ }
+ printf("\n");
+ free(data);
+ }
+
#define FIRST_FEW_BYTES 8000
static int mmfile_is_binary(mmfile_t *mf)
{
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
+ struct diff_options *o,
int complete_rewrite)
{
mmfile_t mf1, mf2;
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
- if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2))
- printf("Binary files %s and %s differ\n", lbl[0], lbl[1]);
+ if (mmfile_is_binary(&mf1) || mmfile_is_binary(&mf2)) {
+ /* Quite common confusing case */
+ if (mf1.size == mf2.size &&
+ !memcmp(mf1.ptr, mf2.ptr, mf1.size))
+ goto free_ab_and_return;
+ if (o->binary)
+ emit_binary_diff(&mf1, &mf2);
+ else
+ printf("Binary files %s and %s differ\n",
+ lbl[0], lbl[1]);
+ }
else {
/* Crazy xdl interfaces.. */
const char *diffopts = getenv("GIT_DIFF_OPTS");
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
+ struct diff_options *o,
int complete_rewrite)
{
if (pgm) {
}
if (one && two)
builtin_diff(name, other ? other : name,
- one, two, xfrm_msg, complete_rewrite);
+ one, two, xfrm_msg, o, complete_rewrite);
else
printf("* Unmerged path %s\n", name);
}
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
- run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, 0);
+ run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
return;
}
* needs to be split into deletion and creation.
*/
struct diff_filespec *null = alloc_filespec(two->path);
- run_diff_cmd(NULL, name, other, one, null, xfrm_msg, 0);
+ run_diff_cmd(NULL, name, other, one, null, xfrm_msg, o, 0);
free(null);
null = alloc_filespec(one->path);
- run_diff_cmd(NULL, name, other, null, two, xfrm_msg, 0);
+ run_diff_cmd(NULL, name, other, null, two, xfrm_msg, o, 0);
free(null);
}
else
- run_diff_cmd(pgm, name, other, one, two, xfrm_msg,
+ run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
complete_rewrite);
free(name_munged);
options->rename_limit = strtoul(arg+2, NULL, 10);
else if (!strcmp(arg, "--full-index"))
options->full_index = 1;
+ else if (!strcmp(arg, "--binary")) {
+ options->output_format = DIFF_FORMAT_PATCH;
+ options->full_index = options->binary = 1;
+ }
else if (!strcmp(arg, "--name-only"))
options->output_format = DIFF_FORMAT_NAME;
else if (!strcmp(arg, "--name-status"))