#include "common.h"

#include "git2/attr.h"

#include "git2/oid.h"

#include "git2/submodule.h"

#include "diff_output.h"

#include <ctype.h>

#include "fileops.h"

#include "filter.h"

#include "buf_text.h"

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 parse_hunk_header(git_diff_range *range, const char *header)

{

/* expect something of the form "@@ -%d[,%d] +%d[,%d] @@" */

if (*header != '@')

return -1;

if (read_next_int(&header, &range->old_start) < 0)

return -1;

if (*header == ',') {

if (read_next_int(&header, &range->old_lines) < 0)

return -1;

} else

range->old_lines = 1;

if (read_next_int(&header, &range->new_start) < 0)

return -1;

if (*header == ',') {

if (read_next_int(&header, &range->new_lines) < 0)

return -1;

} else

range->new_lines = 1;

if (range->old_start < 0 || range->new_start < 0)

return -1;

return 0;

}

#define KNOWN_BINARY_FLAGS (GIT_DIFF_FLAG_BINARY|GIT_DIFF_FLAG_NOT_BINARY)

#define NOT_BINARY_FLAGS (GIT_DIFF_FLAG_NOT_BINARY|GIT_DIFF_FLAG__NO_DATA)

static int update_file_is_binary_by_attr(

git_repository *repo, git_diff_file *file)

{

const char *value;

/* because of blob diffs, cannot assume path is set */

if (!file->path || !strlen(file->path))

return 0;

if (git_attr_get(&value, repo, 0, file->path, "diff") < 0)

return -1;

if (GIT_ATTR_FALSE(value))

file->flags |= GIT_DIFF_FLAG_BINARY;

else if (GIT_ATTR_TRUE(value))

file->flags |= GIT_DIFF_FLAG_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_FLAG_BINARY) != 0 ||

(delta->new_file.flags & GIT_DIFF_FLAG_BINARY) != 0)

delta->flags |= GIT_DIFF_FLAG_BINARY;

else if ((delta->old_file.flags & NOT_BINARY_FLAGS) != 0 &&

(delta->new_file.flags & NOT_BINARY_FLAGS) != 0)

delta->flags |= GIT_DIFF_FLAG_NOT_BINARY;

/* otherwise leave delta->flags binary value untouched */

}

static bool diff_delta_is_binary_forced(

diff_context *ctxt,

git_diff_delta *delta)

{

/* return true if binary-ness has already been settled */

if ((delta->flags & KNOWN_BINARY_FLAGS) != 0)

return true;

/* 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_FLAG_BINARY;

delta->new_file.flags |= GIT_DIFF_FLAG_BINARY;

delta->flags |= GIT_DIFF_FLAG_BINARY;

return true;

}

/* check if user is forcing us to text diff these files */

if (ctxt->opts && (ctxt->opts->flags & GIT_DIFF_FORCE_TEXT) != 0) {

delta->old_file.flags |= GIT_DIFF_FLAG_NOT_BINARY;

delta->new_file.flags |= GIT_DIFF_FLAG_NOT_BINARY;

delta->flags |= GIT_DIFF_FLAG_NOT_BINARY;

return true;

}

return false;

}

static int diff_delta_is_binary_by_attr(

diff_context *ctxt, git_diff_patch *patch)

{

int error = 0, mirror_new;

git_diff_delta *delta = patch->delta;

if (diff_delta_is_binary_forced(ctxt, delta))

return 0;

/* check diff attribute +, -, or 0 */

if (update_file_is_binary_by_attr(ctxt->repo, &delta->old_file) < 0)

return -1;

mirror_new = (delta->new_file.path == delta->old_file.path ||

ctxt->diff->strcomp(delta->new_file.path, delta->old_file.path) == 0);

if (mirror_new)

delta->new_file.flags |= (delta->old_file.flags & KNOWN_BINARY_FLAGS);

else

error = update_file_is_binary_by_attr(ctxt->repo, &delta->new_file);

update_delta_is_binary(delta);

return error;

}

static int diff_delta_is_binary_by_content(

const git_map *map)

{

const git_buf search = { map->data, 0, min(map->len, 4000) };

if (diff_delta_is_binary_forced(ctxt, delta))

return 0;

/* TODO: provide encoding / binary detection callbacks that can

/* previously was: if (git_buf_text_is_binary(&search)) */

if (git_buf_text_contains_nul(&search))

file->flags |= GIT_DIFF_FLAG_BINARY;

else

file->flags |= GIT_DIFF_FLAG_NOT_BINARY;

update_delta_is_binary(delta);

return 0;

}

static int diff_delta_is_binary_by_size(

diff_context *ctxt, git_diff_delta *delta, git_diff_file *file)

{

git_off_t threshold = MAX_DIFF_FILESIZE;

if ((file->flags & KNOWN_BINARY_FLAGS) != 0)

return 0;

if (ctxt && ctxt->opts) {

if (ctxt->opts->max_size < 0)

return 0;

if (ctxt->opts->max_size > 0)

threshold = ctxt->opts->max_size;

}

if (file->size > threshold)

file->flags |= GIT_DIFF_FLAG_BINARY;

update_delta_is_binary(delta);

return 0;

}

static void setup_xdiff_options(

const 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) ? 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_blob **blob)

{

int error;

git_odb_object *odb_obj = NULL;

if (git_oid_iszero(&file->oid))

return 0;

if (file->mode == GIT_FILEMODE_COMMIT)

{

char oidstr[GIT_OID_HEXSZ+1];

git_buf content = GIT_BUF_INIT;

git_oid_fmt(oidstr, &file->oid);

oidstr[GIT_OID_HEXSZ] = 0;

git_buf_printf(&content, "Subproject commit %s\n", oidstr );

map->data = git_buf_detach(&content);

map->len = strlen(map->data);

file->flags |= GIT_DIFF_FLAG__FREE_DATA;

return 0;

}

if (!file->size) {

git_odb *odb;

size_t len;

git_otype type;

/* peek at object header to avoid loading if too large */

if ((error = git_repository_odb__weakptr(&odb, ctxt->repo)) < 0 ||

(error = git_odb__read_header_or_object(

&odb_obj, &len, &type, odb, &file->oid)) < 0)

return error;

assert(type == GIT_OBJ_BLOB);

file->size = len;

}

/* if blob is too large to diff, mark as binary */

if ((error = diff_delta_is_binary_by_size(ctxt, delta, file)) < 0)

return error;

if ((delta->flags & GIT_DIFF_FLAG_BINARY) != 0)

return 0;

if (odb_obj != NULL) {

error = git_object__from_odb_object(

(git_object **)blob, ctxt->repo, odb_obj, GIT_OBJ_BLOB);

git_odb_object_free(odb_obj);

} else

error = git_blob_lookup(blob, ctxt->repo, &file->oid);

if (error)

return error;

map->data = (void *)git_blob_rawcontent(*blob);

map->len = (size_t)git_blob_rawsize(*blob);

return diff_delta_is_binary_by_content(ctxt, delta, file, map);

}

static int get_workdir_sm_content(

diff_context *ctxt,

git_diff_file *file,

git_map *map)

{

int error = 0;

git_buf content = GIT_BUF_INIT;

git_submodule* sm = NULL;

unsigned int sm_status = 0;

const char* sm_status_text = "";

char oidstr[GIT_OID_HEXSZ+1];

if ((error = git_submodule_lookup(&sm, ctxt->repo, file->path)) < 0 ||

(error = git_submodule_status(&sm_status, sm)) < 0)

{

/* GIT_EEXISTS means a "submodule" that has not been git added */

if (error == GIT_EEXISTS)

error = 0;

return error;

}

/* update OID if we didn't have it previously */

if ((file->flags & GIT_DIFF_FLAG_VALID_OID) == 0) {

const git_oid* sm_head;

if ((sm_head = git_submodule_wd_id(sm)) != NULL ||

(sm_head = git_submodule_head_id(sm)) != NULL)

{

git_oid_cpy(&file->oid, sm_head);

file->flags |= GIT_DIFF_FLAG_VALID_OID;

}

}

git_oid_fmt(oidstr, &file->oid);

oidstr[GIT_OID_HEXSZ] = '\0';

if (GIT_SUBMODULE_STATUS_IS_WD_DIRTY(sm_status))

sm_status_text = "-dirty";

git_buf_printf(&content, "Subproject commit %s%s\n",

oidstr, sm_status_text);

map->data = git_buf_detach(&content);

map->len = strlen(map->data);

file->flags |= GIT_DIFF_FLAG__FREE_DATA;

return 0;

}

static int get_filtered(

git_map *map, git_file fd, git_diff_file *file, git_vector *filters)

{

int error;

git_buf raw = GIT_BUF_INIT, filtered = GIT_BUF_INIT;

if ((error = git_futils_readbuffer_fd(&raw, fd, (size_t)file->size)) < 0)

return error;

if (!filters->length)

git_buf_swap(&filtered, &raw);

else

error = git_filters_apply(&filtered, &raw, filters);

if (!error) {

map->len = git_buf_len(&filtered);

map->data = git_buf_detach(&filtered);

file->flags |= GIT_DIFF_FLAG__FREE_DATA;

}

git_buf_free(&raw);

git_buf_free(&filtered);

return error;

}

static int get_workdir_content(

git_map *map)

{

int error = 0;

git_buf path = GIT_BUF_INIT;

const char *wd = git_repository_workdir(ctxt->repo);

if (S_ISGITLINK(file->mode))

return get_workdir_sm_content(ctxt, file, map);

if (S_ISDIR(file->mode))

return 0;

if (git_buf_joinpath(&path, wd, file->path) < 0)

return -1;

if (S_ISLNK(file->mode)) {

ssize_t alloc_len, read_len;

file->flags |= GIT_DIFF_FLAG__FREE_DATA;

file->flags |= GIT_DIFF_FLAG_BINARY;

/* link path on disk could be UTF-16, so prepare a buffer that is

alloc_len = (ssize_t)(file->size * 2) + 1;

map->data = git__malloc(alloc_len);

GITERR_CHECK_ALLOC(map->data);

read_len = p_readlink(path.ptr, map->data, alloc_len);

if (read_len < 0) {

giterr_set(GITERR_OS, "Failed to read symlink '%s'", file->path);

error = -1;

goto cleanup;

}

map->len = read_len;

}

else {

git_file fd = git_futils_open_ro(path.ptr);

git_vector filters = GIT_VECTOR_INIT;

if (fd < 0) {

error = fd;

goto cleanup;

}

if (!file->size && !(file->size = git_futils_filesize(fd)))

goto close_and_cleanup;

if ((error = diff_delta_is_binary_by_size(ctxt, delta, file)) < 0 ||

(delta->flags & GIT_DIFF_FLAG_BINARY) != 0)

goto close_and_cleanup;

error = git_filters_load(

&filters, ctxt->repo, file->path, GIT_FILTER_TO_ODB);

if (error < 0)

goto close_and_cleanup;

if (error == 0) { /* note: git_filters_load returns filter count */

error = git_futils_mmap_ro(map, fd, 0, (size_t)file->size);

if (!error)

file->flags |= GIT_DIFF_FLAG__UNMAP_DATA;

}

if (error != 0)

error = get_filtered(map, fd, file, &filters);

close_and_cleanup:

git_filters_free(&filters);

p_close(fd);

}

/* once data is loaded, update OID if we didn't have it previously */

if (!error && (file->flags & GIT_DIFF_FLAG_VALID_OID) == 0) {

error = git_odb_hash(

&file->oid, map->data, map->len, GIT_OBJ_BLOB);

if (!error)

file->flags |= GIT_DIFF_FLAG_VALID_OID;

}

if (!error)

error = diff_delta_is_binary_by_content(ctxt, delta, file, map);

cleanup:

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_FLAG__FREE_DATA) {

git__free(map->data);

map->data = "";

map->len = 0;

file->flags &= ~GIT_DIFF_FLAG__FREE_DATA;

}

else if (file->flags & GIT_DIFF_FLAG__UNMAP_DATA) {

git_futils_mmap_free(map);

map->data = "";

map->len = 0;

file->flags &= ~GIT_DIFF_FLAG__UNMAP_DATA;

}

}

static int diff_context_init(

void *payload)

{

memset(ctxt, 0, sizeof(diff_context));

if (!repo && diff)

repo = diff->repo;

if (!opts && diff)

opts = &diff->opts;

ctxt->repo = repo;

ctxt->diff = diff;

ctxt->opts = opts;

ctxt->file_cb = file_cb;

ctxt->hunk_cb = hunk_cb;

ctxt->data_cb = data_cb;

ctxt->payload = payload;

ctxt->error = 0;

setup_xdiff_options(ctxt->opts, &ctxt->xdiff_config, &ctxt->xdiff_params);

return 0;

}

static int diff_delta_file_callback(

diff_context *ctxt, git_diff_delta *delta, size_t idx)

{

float progress;

if (!ctxt->file_cb)

return 0;

progress = ctxt->diff ? ((float)idx / ctxt->diff->deltas.length) : 1.0f;

if (ctxt->file_cb(delta, progress, ctxt->payload) != 0)

ctxt->error = GIT_EUSER;

return ctxt->error;

}

static void diff_patch_init(

diff_context *ctxt, git_diff_patch *patch)

{

memset(patch, 0, sizeof(git_diff_patch));

patch->diff = ctxt->diff;

patch->ctxt = ctxt;

if (patch->diff) {

patch->old_src = patch->diff->old_src;

patch->new_src = patch->diff->new_src;

} else {

patch->old_src = patch->new_src = GIT_ITERATOR_TYPE_TREE;

}

}

static git_diff_patch *diff_patch_alloc(

diff_context *ctxt, git_diff_delta *delta)

{

git_diff_patch *patch = git__malloc(sizeof(git_diff_patch));

if (!patch)

return NULL;

diff_patch_init(ctxt, patch);

git_diff_list_addref(patch->diff);

GIT_REFCOUNT_INC(patch);

patch->delta = delta;

patch->flags = GIT_DIFF_PATCH_ALLOCATED;

return patch;

}

static int diff_patch_load(

diff_context *ctxt, git_diff_patch *patch)

{

int error = 0;

git_diff_delta *delta = patch->delta;

bool check_if_unmodified = false;

if ((patch->flags & GIT_DIFF_PATCH_LOADED) != 0)

return 0;

error = diff_delta_is_binary_by_attr(ctxt, patch);

patch->old_data.data = "";

patch->old_data.len = 0;

patch->old_blob = NULL;

patch->new_data.data = "";

patch->new_data.len = 0;

patch->new_blob = NULL;

if ((delta->flags & GIT_DIFF_FLAG_BINARY) != 0)

goto cleanup;

if (!ctxt->hunk_cb &&

!ctxt->data_cb &&

(ctxt->opts->flags & GIT_DIFF_SKIP_BINARY_CHECK) != 0)

goto cleanup;

switch (delta->status) {

case GIT_DELTA_ADDED:

delta->old_file.flags |= GIT_DIFF_FLAG__NO_DATA;

break;

case GIT_DELTA_DELETED:

delta->new_file.flags |= GIT_DIFF_FLAG__NO_DATA;

break;

case GIT_DELTA_MODIFIED:

break;

case GIT_DELTA_UNTRACKED:

delta->old_file.flags |= GIT_DIFF_FLAG__NO_DATA;

if ((ctxt->opts->flags & GIT_DIFF_INCLUDE_UNTRACKED_CONTENT) == 0)

delta->new_file.flags |= GIT_DIFF_FLAG__NO_DATA;

break;

default:

delta->new_file.flags |= GIT_DIFF_FLAG__NO_DATA;

delta->old_file.flags |= GIT_DIFF_FLAG__NO_DATA;

break;

}

#define CHECK_UNMODIFIED (GIT_DIFF_FLAG__NO_DATA | GIT_DIFF_FLAG_VALID_OID)

check_if_unmodified =

(delta->old_file.flags & CHECK_UNMODIFIED) == 0 &&

(delta->new_file.flags & CHECK_UNMODIFIED) == 0;

/* Always try to load workdir content first, since it may need to be

if ((delta->old_file.flags & GIT_DIFF_FLAG__NO_DATA) == 0 &&

patch->old_src == GIT_ITERATOR_TYPE_WORKDIR) {

if ((error = get_workdir_content(

ctxt, delta, &delta->old_file, &patch->old_data)) < 0)

goto cleanup;

if ((delta->flags & GIT_DIFF_FLAG_BINARY) != 0)

goto cleanup;

}

if ((delta->new_file.flags & GIT_DIFF_FLAG__NO_DATA) == 0 &&

patch->new_src == GIT_ITERATOR_TYPE_WORKDIR) {

if ((error = get_workdir_content(

ctxt, delta, &delta->new_file, &patch->new_data)) < 0)

goto cleanup;

if ((delta->flags & GIT_DIFF_FLAG_BINARY) != 0)

goto cleanup;

}

if ((delta->old_file.flags & GIT_DIFF_FLAG__NO_DATA) == 0 &&

patch->old_src != GIT_ITERATOR_TYPE_WORKDIR) {

if ((error = get_blob_content(

ctxt, delta, &delta->old_file,

&patch->old_data, &patch->old_blob)) < 0)

goto cleanup;

if ((delta->flags & GIT_DIFF_FLAG_BINARY) != 0)

goto cleanup;

}

if ((delta->new_file.flags & GIT_DIFF_FLAG__NO_DATA) == 0 &&

patch->new_src != GIT_ITERATOR_TYPE_WORKDIR) {

if ((error = get_blob_content(

ctxt, delta, &delta->new_file,

&patch->new_data, &patch->new_blob)) < 0)

goto cleanup;

if ((delta->flags & GIT_DIFF_FLAG_BINARY) != 0)

goto cleanup;

}

/* if we did not previously have the definitive oid, we may have

if (check_if_unmodified &&

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 ((ctxt->opts->flags & GIT_DIFF_INCLUDE_UNMODIFIED) == 0)

goto cleanup;

}

cleanup:

if ((delta->flags & KNOWN_BINARY_FLAGS) == 0)

update_delta_is_binary(delta);

if (!error) {

patch->flags |= GIT_DIFF_PATCH_LOADED;

/* patch is diffable only for non-binary, modified files where at

if ((delta->flags & GIT_DIFF_FLAG_BINARY) == 0 &&

delta->status != GIT_DELTA_UNMODIFIED &&

(patch->old_data.len || patch->new_data.len) &&

(patch->old_data.len != patch->new_data.len ||

!git_oid_equal(&delta->old_file.oid, &delta->new_file.oid)))

patch->flags |= GIT_DIFF_PATCH_DIFFABLE;

}

return error;

}

static int diff_patch_cb(void *priv, mmbuffer_t *bufs, int len)

{

git_diff_patch *patch = priv;

diff_context *ctxt = patch->ctxt;

if (len == 1) {

ctxt->error = parse_hunk_header(&ctxt->range, bufs[0].ptr);

if (ctxt->error < 0)

return ctxt->error;

if (ctxt->hunk_cb != NULL &&

ctxt->hunk_cb(patch->delta, &ctxt->range,

bufs[0].ptr, bufs[0].size, ctxt->payload))

ctxt->error = GIT_EUSER;

}

if (len == 2 || len == 3) {

/* expect " "/"-"/"+", then data */

char origin =

(*bufs[0].ptr == '+') ? GIT_DIFF_LINE_ADDITION :

(*bufs[0].ptr == '-') ? GIT_DIFF_LINE_DELETION :

GIT_DIFF_LINE_CONTEXT;

if (ctxt->data_cb != NULL &&

ctxt->data_cb(patch->delta, &ctxt->range,

origin, bufs[1].ptr, bufs[1].size, ctxt->payload))

ctxt->error = GIT_EUSER;

}

if (len == 3 && !ctxt->error) {

/* If we have a '+' and a third buf, then we have added a line

char origin =

(*bufs[0].ptr == '+') ? GIT_DIFF_LINE_DEL_EOFNL :

(*bufs[0].ptr == '-') ? GIT_DIFF_LINE_ADD_EOFNL :

GIT_DIFF_LINE_CONTEXT;

if (ctxt->data_cb != NULL &&

ctxt->data_cb(patch->delta, &ctxt->range,

origin, bufs[2].ptr, bufs[2].size, ctxt->payload))

ctxt->error = GIT_EUSER;

}

return ctxt->error;

}

static int diff_patch_generate(

diff_context *ctxt, git_diff_patch *patch)

{

int error = 0;

xdemitcb_t xdiff_callback;

mmfile_t old_xdiff_data, new_xdiff_data;

if ((patch->flags & GIT_DIFF_PATCH_DIFFED) != 0)

return 0;

if ((patch->flags & GIT_DIFF_PATCH_LOADED) == 0)

if ((error = diff_patch_load(ctxt, patch)) < 0)

return error;

if ((patch->flags & GIT_DIFF_PATCH_DIFFABLE) == 0)

return 0;

if (!ctxt->file_cb && !ctxt->hunk_cb)

return 0;

patch->ctxt = ctxt;

memset(&xdiff_callback, 0, sizeof(xdiff_callback));

xdiff_callback.outf = diff_patch_cb;

xdiff_callback.priv = patch;

old_xdiff_data.ptr = patch->old_data.data;

old_xdiff_data.size = patch->old_data.len;

new_xdiff_data.ptr = patch->new_data.data;

new_xdiff_data.size = patch->new_data.len;

xdl_diff(&old_xdiff_data, &new_xdiff_data,

&ctxt->xdiff_params, &ctxt->xdiff_config, &xdiff_callback);

error = ctxt->error;

if (!error)

patch->flags |= GIT_DIFF_PATCH_DIFFED;

return error;

}

static void diff_patch_unload(git_diff_patch *patch)

{

if ((patch->flags & GIT_DIFF_PATCH_DIFFED) != 0) {

patch->flags = (patch->flags & ~GIT_DIFF_PATCH_DIFFED);

patch->hunks_size = 0;

patch->lines_size = 0;

}

if ((patch->flags & GIT_DIFF_PATCH_LOADED) != 0) {

patch->flags = (patch->flags & ~GIT_DIFF_PATCH_LOADED);

release_content(

&patch->delta->old_file, &patch->old_data, patch->old_blob);

release_content(

&patch->delta->new_file, &patch->new_data, patch->new_blob);

}

}

static void diff_patch_free(git_diff_patch *patch)

{

diff_patch_unload(patch);

git__free(patch->lines);

patch->lines = NULL;

patch->lines_asize = 0;

git__free(patch->hunks);

patch->hunks = NULL;

patch->hunks_asize = 0;

if (!(patch->flags & GIT_DIFF_PATCH_ALLOCATED))

return;

patch->flags = 0;

git_diff_list_free(patch->diff); /* decrements refcount */

git__free(patch);

}

#define MAX_HUNK_STEP 128

#define MIN_HUNK_STEP 8

#define MAX_LINE_STEP 256

#define MIN_LINE_STEP 8

static int diff_patch_hunk_cb(

void *payload)

{

git_diff_patch *patch = payload;

diff_patch_hunk *hunk;

GIT_UNUSED(delta);

if (patch->hunks_size >= patch->hunks_asize) {

size_t new_size;

diff_patch_hunk *new_hunks;

if (patch->hunks_asize > MAX_HUNK_STEP)

new_size = patch->hunks_asize + MAX_HUNK_STEP;

else

new_size = patch->hunks_asize * 2;

if (new_size < MIN_HUNK_STEP)

new_size = MIN_HUNK_STEP;

new_hunks = git__realloc(

patch->hunks, new_size * sizeof(diff_patch_hunk));

if (!new_hunks)

return -1;

patch->hunks = new_hunks;

patch->hunks_asize = new_size;

}

hunk = &patch->hunks[patch->hunks_size++];

memcpy(&hunk->range, range, sizeof(hunk->range));

assert(header_len + 1 < sizeof(hunk->header));

memcpy(&hunk->header, header, header_len);

hunk->header[header_len] = '\0';

hunk->header_len = header_len;

hunk->line_start = patch->lines_size;

hunk->line_count = 0;

patch->oldno = range->old_start;

patch->newno = range->new_start;

return 0;

}

static int diff_patch_line_cb(

void *payload)

{

git_diff_patch *patch = payload;

diff_patch_hunk *hunk;

diff_patch_line *line;

GIT_UNUSED(delta);

GIT_UNUSED(range);

assert(patch->hunks_size > 0);

assert(patch->hunks != NULL);

hunk = &patch->hunks[patch->hunks_size - 1];

if (patch->lines_size >= patch->lines_asize) {

size_t new_size;

diff_patch_line *new_lines;

if (patch->lines_asize > MAX_LINE_STEP)

new_size = patch->lines_asize + MAX_LINE_STEP;

else

new_size = patch->lines_asize * 2;

if (new_size < MIN_LINE_STEP)

new_size = MIN_LINE_STEP;

new_lines = git__realloc(

patch->lines, new_size * sizeof(diff_patch_line));

if (!new_lines)

return -1;

patch->lines = new_lines;

patch->lines_asize = new_size;

}

line = &patch->lines[patch->lines_size++];

line->ptr = content;

line->len = content_len;

line->origin = line_origin;

/* do some bookkeeping so we can provide old/new line numbers */

for (line->lines = 0; content_len > 0; --content_len) {

if (*content++ == '\n')

++line->lines;

}

switch (line_origin) {

case GIT_DIFF_LINE_ADDITION:

line->oldno = -1;

line->newno = patch->newno;

patch->newno += line->lines;

break;

case GIT_DIFF_LINE_DELETION:

line->oldno = patch->oldno;

line->newno = -1;

patch->oldno += line->lines;

break;

default:

line->oldno = patch->oldno;

line->newno = patch->newno;

patch->oldno += line->lines;

patch->newno += line->lines;

break;

}

hunk->line_count++;

return 0;

}

static int diff_required(git_diff_list *diff, const char *action)

{

if (!diff) {

giterr_set(GITERR_INVALID, "Must provide valid diff to %s", action);

return -1;

}

return 0;

}

int git_diff_foreach(

void *payload)

{

int error = 0;

diff_context ctxt;

size_t idx;

git_diff_patch patch;

if (diff_required(diff, "git_diff_foreach") < 0)

return -1;

if (diff_context_init(

&ctxt, diff, NULL, NULL, file_cb, hunk_cb, data_cb, payload) < 0)

return -1;

diff_patch_init(&ctxt, &patch);

git_vector_foreach(&diff->deltas, idx, patch.delta) {

/* check flags against patch status */

if (git_diff_delta__should_skip(ctxt.opts, patch.delta))

continue;

if (!(error = diff_patch_load(&ctxt, &patch))) {

/* invoke file callback */

error = diff_delta_file_callback(&ctxt, patch.delta, idx);

/* generate diffs and invoke hunk and line callbacks */

if (!error)

error = diff_patch_generate(&ctxt, &patch);