Hash :
5f4a61ae
Author :
Date :
2012-08-09T19:43:25
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/*
* Copyright (C) 2012 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "git2/diff.h"
#include "git2/attr.h"
#include "git2/blob.h"
#include "git2/oid.h"
#include "xdiff/xdiff.h"
#include <ctype.h>
#include "diff.h"
#include "map.h"
#include "fileops.h"
#include "filter.h"
typedef struct {
git_diff_list *diff;
void *cb_data;
git_diff_hunk_fn hunk_cb;
git_diff_data_fn line_cb;
unsigned int index;
git_diff_delta *delta;
git_diff_range range;
int error;
} diff_output_info;
static int read_next_int(const char **str, int *value)
{
const char *scan = *str;
int v = 0, digits = 0;
/* find next digit */
for (scan = *str; *scan && !isdigit(*scan); scan++);
/* parse next number */
for (; isdigit(*scan); scan++, digits++)
v = (v * 10) + (*scan - '0');
*str = scan;
*value = v;
return (digits > 0) ? 0 : -1;
}
static int diff_output_cb(void *priv, mmbuffer_t *bufs, int len)
{
diff_output_info *info = priv;
if (len == 1 && info->hunk_cb) {
git_diff_range range = { -1, 0, -1, 0 };
const char *scan = bufs[0].ptr;
/* expect something of the form "@@ -%d[,%d] +%d[,%d] @@" */
if (*scan != '@')
info->error = -1;
else if (read_next_int(&scan, &range.old_start) < 0)
info->error = -1;
else if (*scan == ',' && read_next_int(&scan, &range.old_lines) < 0)
info->error = -1;
else if (read_next_int(&scan, &range.new_start) < 0)
info->error = -1;
else if (*scan == ',' && read_next_int(&scan, &range.new_lines) < 0)
info->error = -1;
else if (range.old_start < 0 || range.new_start < 0)
info->error = -1;
else {
memcpy(&info->range, &range, sizeof(git_diff_range));
if (info->hunk_cb(
info->cb_data, info->delta, &range, bufs[0].ptr, bufs[0].size))
info->error = GIT_EUSER;
}
}
if ((len == 2 || len == 3) && info->line_cb) {
int origin;
/* expect " "/"-"/"+", then data, then maybe newline */
origin =
(*bufs[0].ptr == '+') ? GIT_DIFF_LINE_ADDITION :
(*bufs[0].ptr == '-') ? GIT_DIFF_LINE_DELETION :
GIT_DIFF_LINE_CONTEXT;
if (info->line_cb(
info->cb_data, info->delta, &info->range, origin, bufs[1].ptr, bufs[1].size))
info->error = GIT_EUSER;
/* This should only happen if we are adding a line that does not
* have a newline at the end and the old code did. In that case,
* we have a ADD with a DEL_EOFNL as a pair.
*/
else if (len == 3) {
origin = (origin == GIT_DIFF_LINE_ADDITION) ?
GIT_DIFF_LINE_DEL_EOFNL : GIT_DIFF_LINE_ADD_EOFNL;
if (info->line_cb(
info->cb_data, info->delta, &info->range, origin, bufs[2].ptr, bufs[2].size))
info->error = GIT_EUSER;
}
}
return info->error;
}
#define BINARY_DIFF_FLAGS (GIT_DIFF_FILE_BINARY|GIT_DIFF_FILE_NOT_BINARY)
static int update_file_is_binary_by_attr(git_repository *repo, git_diff_file *file)
{
const char *value;
if (git_attr_get(&value, repo, 0, file->path, "diff") < 0)
return -1;
if (GIT_ATTR_FALSE(value))
file->flags |= GIT_DIFF_FILE_BINARY;
else if (GIT_ATTR_TRUE(value))
file->flags |= GIT_DIFF_FILE_NOT_BINARY;
/* otherwise leave file->flags alone */
return 0;
}
static void update_delta_is_binary(git_diff_delta *delta)
{
if ((delta->old_file.flags & GIT_DIFF_FILE_BINARY) != 0 ||
(delta->new_file.flags & GIT_DIFF_FILE_BINARY) != 0)
delta->binary = 1;
else if ((delta->old_file.flags & GIT_DIFF_FILE_NOT_BINARY) != 0 ||
(delta->new_file.flags & GIT_DIFF_FILE_NOT_BINARY) != 0)
delta->binary = 0;
/* otherwise leave delta->binary value untouched */
}
static int file_is_binary_by_attr(
git_diff_list *diff,
git_diff_delta *delta)
{
int error = 0, mirror_new;
delta->binary = -1;
/* make sure files are conceivably mmap-able */
if ((git_off_t)((size_t)delta->old_file.size) != delta->old_file.size ||
(git_off_t)((size_t)delta->new_file.size) != delta->new_file.size)
{
delta->old_file.flags |= GIT_DIFF_FILE_BINARY;
delta->new_file.flags |= GIT_DIFF_FILE_BINARY;
delta->binary = 1;
return 0;
}
/* check if user is forcing us to text diff these files */
if (diff->opts.flags & GIT_DIFF_FORCE_TEXT) {
delta->old_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
delta->new_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
delta->binary = 0;
return 0;
}
/* check diff attribute +, -, or 0 */
if (update_file_is_binary_by_attr(diff->repo, &delta->old_file) < 0)
return -1;
mirror_new = (delta->new_file.path == delta->old_file.path ||
strcmp(delta->new_file.path, delta->old_file.path) == 0);
if (mirror_new)
delta->new_file.flags |= (delta->old_file.flags & BINARY_DIFF_FLAGS);
else
error = update_file_is_binary_by_attr(diff->repo, &delta->new_file);
update_delta_is_binary(delta);
return error;
}
static int file_is_binary_by_content(
git_diff_delta *delta,
git_map *old_data,
git_map *new_data)
{
git_buf search;
if ((delta->old_file.flags & BINARY_DIFF_FLAGS) == 0) {
search.ptr = old_data->data;
search.size = min(old_data->len, 4000);
if (git_buf_is_binary(&search))
delta->old_file.flags |= GIT_DIFF_FILE_BINARY;
else
delta->old_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
}
if ((delta->new_file.flags & BINARY_DIFF_FLAGS) == 0) {
search.ptr = new_data->data;
search.size = min(new_data->len, 4000);
if (git_buf_is_binary(&search))
delta->new_file.flags |= GIT_DIFF_FILE_BINARY;
else
delta->new_file.flags |= GIT_DIFF_FILE_NOT_BINARY;
}
update_delta_is_binary(delta);
/* TODO: if value != NULL, implement diff drivers */
return 0;
}
static void setup_xdiff_options(
git_diff_options *opts, xdemitconf_t *cfg, xpparam_t *param)
{
memset(cfg, 0, sizeof(xdemitconf_t));
memset(param, 0, sizeof(xpparam_t));
cfg->ctxlen =
(!opts || !opts->context_lines) ? 3 : opts->context_lines;
cfg->interhunkctxlen =
(!opts) ? 0 : opts->interhunk_lines;
if (!opts)
return;
if (opts->flags & GIT_DIFF_IGNORE_WHITESPACE)
param->flags |= XDF_WHITESPACE_FLAGS;
if (opts->flags & GIT_DIFF_IGNORE_WHITESPACE_CHANGE)
param->flags |= XDF_IGNORE_WHITESPACE_CHANGE;
if (opts->flags & GIT_DIFF_IGNORE_WHITESPACE_EOL)
param->flags |= XDF_IGNORE_WHITESPACE_AT_EOL;
}
static int get_blob_content(
git_repository *repo,
const git_oid *oid,
git_map *map,
git_blob **blob)
{
if (git_oid_iszero(oid))
return 0;
if (git_blob_lookup(blob, repo, oid) < 0)
return -1;
map->data = (void *)git_blob_rawcontent(*blob);
map->len = git_blob_rawsize(*blob);
return 0;
}
static int get_workdir_content(
git_repository *repo,
git_diff_file *file,
git_map *map)
{
int error = 0;
git_buf path = GIT_BUF_INIT;
if (git_buf_joinpath(&path, git_repository_workdir(repo), file->path) < 0)
return -1;
if (S_ISLNK(file->mode)) {
ssize_t read_len;
file->flags |= GIT_DIFF_FILE_FREE_DATA;
file->flags |= GIT_DIFF_FILE_BINARY;
map->data = git__malloc((size_t)file->size + 1);
GITERR_CHECK_ALLOC(map->data);
read_len = p_readlink(path.ptr, map->data, (size_t)file->size + 1);
if (read_len != (ssize_t)file->size) {
giterr_set(GITERR_OS, "Failed to read symlink '%s'", file->path);
error = -1;
} else
map->len = read_len;
}
else {
error = git_futils_mmap_ro_file(map, path.ptr);
file->flags |= GIT_DIFF_FILE_UNMAP_DATA;
}
git_buf_free(&path);
return error;
}
static void release_content(git_diff_file *file, git_map *map, git_blob *blob)
{
if (blob != NULL)
git_blob_free(blob);
if (file->flags & GIT_DIFF_FILE_FREE_DATA) {
git__free(map->data);
map->data = NULL;
file->flags &= ~GIT_DIFF_FILE_FREE_DATA;
}
else if (file->flags & GIT_DIFF_FILE_UNMAP_DATA) {
git_futils_mmap_free(map);
map->data = NULL;
file->flags &= ~GIT_DIFF_FILE_UNMAP_DATA;
}
}
static void fill_map_from_mmfile(git_map *dst, mmfile_t *src) {
assert(dst && src);
dst->data = src->ptr;
dst->len = src->size;
#ifdef GIT_WIN32
dst->fmh = NULL;
#endif
}
int git_diff_foreach(
git_diff_list *diff,
void *data,
git_diff_file_fn file_cb,
git_diff_hunk_fn hunk_cb,
git_diff_data_fn line_cb)
{
int error = 0;
diff_output_info info;
git_diff_delta *delta;
xpparam_t xdiff_params;
xdemitconf_t xdiff_config;
xdemitcb_t xdiff_callback;
memset(&info, 0, sizeof(info));
info.diff = diff;
info.cb_data = data;
info.hunk_cb = hunk_cb;
info.line_cb = line_cb;
setup_xdiff_options(&diff->opts, &xdiff_config, &xdiff_params);
memset(&xdiff_callback, 0, sizeof(xdiff_callback));
xdiff_callback.outf = diff_output_cb;
xdiff_callback.priv = &info;
git_vector_foreach(&diff->deltas, info.index, delta) {
git_blob *old_blob = NULL, *new_blob = NULL;
git_map old_data, new_data;
mmfile_t old_xdiff_data, new_xdiff_data;
if (delta->status == GIT_DELTA_UNMODIFIED &&
(diff->opts.flags & GIT_DIFF_INCLUDE_UNMODIFIED) == 0)
continue;
if (delta->status == GIT_DELTA_IGNORED &&
(diff->opts.flags & GIT_DIFF_INCLUDE_IGNORED) == 0)
continue;
if (delta->status == GIT_DELTA_UNTRACKED &&
(diff->opts.flags & GIT_DIFF_INCLUDE_UNTRACKED) == 0)
continue;
if ((error = file_is_binary_by_attr(diff, delta)) < 0)
goto cleanup;
old_data.data = "";
old_data.len = 0;
new_data.data = "";
new_data.len = 0;
/* TODO: Partial blob reading to defer loading whole blob.
* I.e. I want a blob with just the first 4kb loaded, then
* later on I will read the rest of the blob if needed.
*/
/* map files */
if (delta->binary != 1 &&
(hunk_cb || line_cb || git_oid_iszero(&delta->old_file.oid)) &&
(delta->status == GIT_DELTA_DELETED ||
delta->status == GIT_DELTA_MODIFIED))
{
if (diff->old_src == GIT_ITERATOR_WORKDIR)
error = get_workdir_content(diff->repo, &delta->old_file, &old_data);
else
error = get_blob_content(
diff->repo, &delta->old_file.oid, &old_data, &old_blob);
if (error < 0)
goto cleanup;
}
if (delta->binary != 1 &&
(hunk_cb || line_cb || git_oid_iszero(&delta->new_file.oid)) &&
(delta->status == GIT_DELTA_ADDED ||
delta->status == GIT_DELTA_MODIFIED))
{
if (diff->new_src == GIT_ITERATOR_WORKDIR)
error = get_workdir_content(diff->repo, &delta->new_file, &new_data);
else
error = get_blob_content(
diff->repo, &delta->new_file.oid, &new_data, &new_blob);
if (error < 0)
goto cleanup;
if ((delta->new_file.flags & GIT_DIFF_FILE_VALID_OID) == 0) {
error = git_odb_hash(
&delta->new_file.oid, new_data.data, new_data.len, GIT_OBJ_BLOB);
if (error < 0)
goto cleanup;
delta->new_file.flags |= GIT_DIFF_FILE_VALID_OID;
/* since we did not have the definitive oid, we may have
* incorrect status and need to skip this item.
*/
if (delta->old_file.mode == delta->new_file.mode &&
!git_oid_cmp(&delta->old_file.oid, &delta->new_file.oid))
{
delta->status = GIT_DELTA_UNMODIFIED;
if ((diff->opts.flags & GIT_DIFF_INCLUDE_UNMODIFIED) == 0)
goto cleanup;
}
}
}
/* if we have not already decided whether file is binary,
* check the first 4K for nul bytes to decide...
*/
if (delta->binary == -1) {
error = file_is_binary_by_content(
delta, &old_data, &new_data);
if (error < 0)
goto cleanup;
}
/* TODO: if ignore_whitespace is set, then we *must* do text
* diffs to tell if a file has really been changed.
*/
if (file_cb != NULL &&
file_cb(data, delta, (float)info.index / diff->deltas.length))
{
error = GIT_EUSER;
goto cleanup;
}
/* don't do hunk and line diffs if file is binary */
if (delta->binary == 1)
goto cleanup;
/* nothing to do if we did not get data */
if (!old_data.len && !new_data.len)
goto cleanup;
/* nothing to do if only diff was a mode change */
if (!git_oid_cmp(&delta->old_file.oid, &delta->new_file.oid))
goto cleanup;
assert(hunk_cb || line_cb);
info.delta = delta;
old_xdiff_data.ptr = old_data.data;
old_xdiff_data.size = old_data.len;
new_xdiff_data.ptr = new_data.data;
new_xdiff_data.size = new_data.len;
xdl_diff(&old_xdiff_data, &new_xdiff_data,
&xdiff_params, &xdiff_config, &xdiff_callback);
error = info.error;
cleanup:
release_content(&delta->old_file, &old_data, old_blob);
release_content(&delta->new_file, &new_data, new_blob);
if (error < 0)
break;
}
return error;
}
typedef struct {
git_diff_list *diff;
git_diff_data_fn print_cb;
void *cb_data;
git_buf *buf;
} diff_print_info;
static char pick_suffix(int mode)
{
if (S_ISDIR(mode))
return '/';
else if (mode & 0100) //-V536
/* in git, modes are very regular, so we must have 0100755 mode */
return '*';
else
return ' ';
}
static int print_compact(void *data, git_diff_delta *delta, float progress)
{
diff_print_info *pi = data;
char code, old_suffix, new_suffix;
GIT_UNUSED(progress);
switch (delta->status) {
case GIT_DELTA_ADDED: code = 'A'; break;
case GIT_DELTA_DELETED: code = 'D'; break;
case GIT_DELTA_MODIFIED: code = 'M'; break;
case GIT_DELTA_RENAMED: code = 'R'; break;
case GIT_DELTA_COPIED: code = 'C'; break;
case GIT_DELTA_IGNORED: code = 'I'; break;
case GIT_DELTA_UNTRACKED: code = '?'; break;
default: code = 0;
}
if (!code)
return 0;
old_suffix = pick_suffix(delta->old_file.mode);
new_suffix = pick_suffix(delta->new_file.mode);
git_buf_clear(pi->buf);
if (delta->old_file.path != delta->new_file.path &&
strcmp(delta->old_file.path,delta->new_file.path) != 0)
git_buf_printf(pi->buf, "%c\t%s%c -> %s%c\n", code,
delta->old_file.path, old_suffix, delta->new_file.path, new_suffix);
else if (delta->old_file.mode != delta->new_file.mode &&
delta->old_file.mode != 0 && delta->new_file.mode != 0)
git_buf_printf(pi->buf, "%c\t%s%c (%o -> %o)\n", code,
delta->old_file.path, new_suffix, delta->old_file.mode, delta->new_file.mode);
else if (old_suffix != ' ')
git_buf_printf(pi->buf, "%c\t%s%c\n", code, delta->old_file.path, old_suffix);
else
git_buf_printf(pi->buf, "%c\t%s\n", code, delta->old_file.path);
if (git_buf_oom(pi->buf))
return -1;
if (pi->print_cb(pi->cb_data, delta, NULL, GIT_DIFF_LINE_FILE_HDR,
git_buf_cstr(pi->buf), git_buf_len(pi->buf)))
return GIT_EUSER;
return 0;
}
int git_diff_print_compact(
git_diff_list *diff,
void *cb_data,
git_diff_data_fn print_cb)
{
int error;
git_buf buf = GIT_BUF_INIT;
diff_print_info pi;
pi.diff = diff;
pi.print_cb = print_cb;
pi.cb_data = cb_data;
pi.buf = &buf;
error = git_diff_foreach(diff, &pi, print_compact, NULL, NULL);
git_buf_free(&buf);
return error;
}
static int print_oid_range(diff_print_info *pi, git_diff_delta *delta)
{
char start_oid[8], end_oid[8];
/* TODO: Determine a good actual OID range to print */
git_oid_tostr(start_oid, sizeof(start_oid), &delta->old_file.oid);
git_oid_tostr(end_oid, sizeof(end_oid), &delta->new_file.oid);
/* TODO: Match git diff more closely */
if (delta->old_file.mode == delta->new_file.mode) {
git_buf_printf(pi->buf, "index %s..%s %o\n",
start_oid, end_oid, delta->old_file.mode);
} else {
if (delta->old_file.mode == 0) {
git_buf_printf(pi->buf, "new file mode %o\n", delta->new_file.mode);
} else if (delta->new_file.mode == 0) {
git_buf_printf(pi->buf, "deleted file mode %o\n", delta->old_file.mode);
} else {
git_buf_printf(pi->buf, "old mode %o\n", delta->old_file.mode);
git_buf_printf(pi->buf, "new mode %o\n", delta->new_file.mode);
}
git_buf_printf(pi->buf, "index %s..%s\n", start_oid, end_oid);
}
if (git_buf_oom(pi->buf))
return -1;
return 0;
}
static int print_patch_file(void *data, git_diff_delta *delta, float progress)
{
diff_print_info *pi = data;
const char *oldpfx = pi->diff->opts.old_prefix;
const char *oldpath = delta->old_file.path;
const char *newpfx = pi->diff->opts.new_prefix;
const char *newpath = delta->new_file.path;
GIT_UNUSED(progress);
if (!oldpfx)
oldpfx = DIFF_OLD_PREFIX_DEFAULT;
if (!newpfx)
newpfx = DIFF_NEW_PREFIX_DEFAULT;
git_buf_clear(pi->buf);
git_buf_printf(pi->buf, "diff --git %s%s %s%s\n", oldpfx, delta->old_file.path, newpfx, delta->new_file.path);
if (print_oid_range(pi, delta) < 0)
return -1;
if (git_oid_iszero(&delta->old_file.oid)) {
oldpfx = "";
oldpath = "/dev/null";
}
if (git_oid_iszero(&delta->new_file.oid)) {
newpfx = "";
newpath = "/dev/null";
}
if (delta->binary != 1) {
git_buf_printf(pi->buf, "--- %s%s\n", oldpfx, oldpath);
git_buf_printf(pi->buf, "+++ %s%s\n", newpfx, newpath);
}
if (git_buf_oom(pi->buf))
return -1;
if (pi->print_cb(pi->cb_data, delta, NULL, GIT_DIFF_LINE_FILE_HDR, git_buf_cstr(pi->buf), git_buf_len(pi->buf)))
return GIT_EUSER;
if (delta->binary != 1)
return 0;
git_buf_clear(pi->buf);
git_buf_printf(
pi->buf, "Binary files %s%s and %s%s differ\n",
oldpfx, oldpath, newpfx, newpath);
if (git_buf_oom(pi->buf))
return -1;
if (pi->print_cb(pi->cb_data, delta, NULL, GIT_DIFF_LINE_BINARY,
git_buf_cstr(pi->buf), git_buf_len(pi->buf)))
return GIT_EUSER;
return 0;
}
static int print_patch_hunk(
void *data,
git_diff_delta *d,
git_diff_range *r,
const char *header,
size_t header_len)
{
diff_print_info *pi = data;
git_buf_clear(pi->buf);
if (git_buf_printf(pi->buf, "%.*s", (int)header_len, header) < 0)
return -1;
if (pi->print_cb(pi->cb_data, d, r, GIT_DIFF_LINE_HUNK_HDR,
git_buf_cstr(pi->buf), git_buf_len(pi->buf)))
return GIT_EUSER;
return 0;
}
static int print_patch_line(
void *data,
git_diff_delta *delta,
git_diff_range *range,
char line_origin, /* GIT_DIFF_LINE value from above */
const char *content,
size_t content_len)
{
diff_print_info *pi = data;
git_buf_clear(pi->buf);
if (line_origin == GIT_DIFF_LINE_ADDITION ||
line_origin == GIT_DIFF_LINE_DELETION ||
line_origin == GIT_DIFF_LINE_CONTEXT)
git_buf_printf(pi->buf, "%c%.*s", line_origin, (int)content_len, content);
else if (content_len > 0)
git_buf_printf(pi->buf, "%.*s", (int)content_len, content);
if (git_buf_oom(pi->buf))
return -1;
if (pi->print_cb(pi->cb_data, delta, range, line_origin,
git_buf_cstr(pi->buf), git_buf_len(pi->buf)))
return GIT_EUSER;
return 0;
}
int git_diff_print_patch(
git_diff_list *diff,
void *cb_data,
git_diff_data_fn print_cb)
{
int error;
git_buf buf = GIT_BUF_INIT;
diff_print_info pi;
pi.diff = diff;
pi.print_cb = print_cb;
pi.cb_data = cb_data;
pi.buf = &buf;
error = git_diff_foreach(
diff, &pi, print_patch_file, print_patch_hunk, print_patch_line);
git_buf_free(&buf);
return error;
}
int git_diff_entrycount(git_diff_list *diff, int delta_t)
{
int count = 0;
unsigned int i;
git_diff_delta *delta;
assert(diff);
if (delta_t < 0)
return diff->deltas.length;
git_vector_foreach(&diff->deltas, i, delta) {
if (delta->status == (git_delta_t)delta_t)
count++;
}
return count;
}
int git_diff_blobs(
git_blob *old_blob,
git_blob *new_blob,
git_diff_options *options,
void *cb_data,
git_diff_file_fn file_cb,
git_diff_hunk_fn hunk_cb,
git_diff_data_fn line_cb)
{
diff_output_info info;
git_diff_delta delta;
mmfile_t old_data, new_data;
git_map old_map, new_map;
xpparam_t xdiff_params;
xdemitconf_t xdiff_config;
xdemitcb_t xdiff_callback;
git_blob *new, *old;
memset(&delta, 0, sizeof(delta));
new = new_blob;
old = old_blob;
if (options && (options->flags & GIT_DIFF_REVERSE)) {
git_blob *swap = old;
old = new;
new = swap;
}
if (old) {
old_data.ptr = (char *)git_blob_rawcontent(old);
old_data.size = git_blob_rawsize(old);
git_oid_cpy(&delta.old_file.oid, git_object_id((const git_object *)old));
} else {
old_data.ptr = "";
old_data.size = 0;
}
if (new) {
new_data.ptr = (char *)git_blob_rawcontent(new);
new_data.size = git_blob_rawsize(new);
git_oid_cpy(&delta.new_file.oid, git_object_id((const git_object *)new));
} else {
new_data.ptr = "";
new_data.size = 0;
}
/* populate a "fake" delta record */
delta.status = new ?
(old ? GIT_DELTA_MODIFIED : GIT_DELTA_ADDED) :
(old ? GIT_DELTA_DELETED : GIT_DELTA_UNTRACKED);
if (git_oid_cmp(&delta.new_file.oid, &delta.old_file.oid) == 0)
delta.status = GIT_DELTA_UNMODIFIED;
delta.old_file.size = old_data.size;
delta.new_file.size = new_data.size;
fill_map_from_mmfile(&old_map, &old_data);
fill_map_from_mmfile(&new_map, &new_data);
if (file_is_binary_by_content(&delta, &old_map, &new_map) < 0)
return -1;
if (file_cb != NULL && file_cb(cb_data, &delta, 1))
return GIT_EUSER;
/* don't do hunk and line diffs if the two blobs are identical */
if (delta.status == GIT_DELTA_UNMODIFIED)
return 0;
/* don't do hunk and line diffs if file is binary */
if (delta.binary == 1)
return 0;
memset(&info, 0, sizeof(info));
info.diff = NULL;
info.delta = δ
info.cb_data = cb_data;
info.hunk_cb = hunk_cb;
info.line_cb = line_cb;
setup_xdiff_options(options, &xdiff_config, &xdiff_params);
memset(&xdiff_callback, 0, sizeof(xdiff_callback));
xdiff_callback.outf = diff_output_cb;
xdiff_callback.priv = &info;
xdl_diff(&old_data, &new_data, &xdiff_params, &xdiff_config, &xdiff_callback);
return info.error;
}