shared.c - infrastructure/cgit.git - Linaro Git Browser

 /* shared.c: global vars + some callback functions
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */

 #include "cgit.h"

 struct repolist cgit_repolist;
 struct repoinfo *cgit_repo;
 int cgit_cmd;

 char *cgit_root_title   = "Git repository browser";
 char *cgit_css          = "/cgit.css";
 char *cgit_logo         = "/git-logo.png";
 char *cgit_index_header = NULL;
 char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
 char *cgit_module_link  = "./?repo=%s&page=commit&id=%s";
 char *cgit_agefile      = "info/web/last-modified";
 char *cgit_virtual_root = NULL;
 char *cgit_script_name  = CGIT_SCRIPT_NAME;
 char *cgit_cache_root   = "/var/cache/cgit";
 char *cgit_repo_group   = NULL;

 int cgit_nocache               =  0;
 int cgit_snapshots             =  0;
 int cgit_enable_log_filecount  =  0;
 int cgit_enable_log_linecount  =  0;
 int cgit_max_lock_attempts     =  5;
 int cgit_cache_root_ttl        =  5;
 int cgit_cache_repo_ttl        =  5;
 int cgit_cache_dynamic_ttl     =  5;
 int cgit_cache_static_ttl      = -1;
 int cgit_cache_max_create_time =  5;
 int cgit_summary_log           =  0;

 int cgit_max_msg_len = 60;
 int cgit_max_repodesc_len = 60;
 int cgit_max_commit_count = 50;

 int cgit_query_has_symref = 0;
 int cgit_query_has_sha1   = 0;

 char *cgit_querystring  = NULL;
 char *cgit_query_repo   = NULL;
 char *cgit_query_page   = NULL;
 char *cgit_query_head   = NULL;
 char *cgit_query_search = NULL;
 char *cgit_query_sha1   = NULL;
 char *cgit_query_sha2   = NULL;
 char *cgit_query_path   = NULL;
 char *cgit_query_name   = NULL;
 int   cgit_query_ofs    = 0;

 int htmlfd = 0;


 int cgit_get_cmd_index(const char *cmd)
 {
 	static char *cmds[] = {"log", "commit", "diff", "tree", "view", "blob", "snapshot", NULL};
 	int i;

 	for(i = 0; cmds[i]; i++)
 		if (!strcmp(cmd, cmds[i]))
 			return i + 1;
 	return 0;
 }

 int chk_zero(int result, char *msg)
 {
 	if (result != 0)
 		die("%s: %s", msg, strerror(errno));
 	return result;
 }

 int chk_positive(int result, char *msg)
 {
 	if (result <= 0)
 		die("%s: %s", msg, strerror(errno));
 	return result;
 }

 struct repoinfo *add_repo(const char *url)
 {
 	struct repoinfo *ret;

 	if (++cgit_repolist.count > cgit_repolist.length) {
 		if (cgit_repolist.length == 0)
 			cgit_repolist.length = 8;
 		else
 			cgit_repolist.length *= 2;
 		cgit_repolist.repos = xrealloc(cgit_repolist.repos,
 					       cgit_repolist.length *
 					       sizeof(struct repoinfo));
 	}

 	ret = &cgit_repolist.repos[cgit_repolist.count-1];
 	ret->url = xstrdup(url);
 	ret->name = ret->url;
 	ret->path = NULL;
 	ret->desc = NULL;
 	ret->owner = NULL;
 	ret->group = cgit_repo_group;
 	ret->defbranch = "master";
 	ret->snapshots = cgit_snapshots;
 	ret->enable_log_filecount = cgit_enable_log_filecount;
 	ret->enable_log_linecount = cgit_enable_log_linecount;
 	ret->module_link = cgit_module_link;
 	ret->readme = NULL;
 	return ret;
 }

 struct repoinfo *cgit_get_repoinfo(const char *url)
 {
 	int i;
 	struct repoinfo *repo;

 	for (i=0; i<cgit_repolist.count; i++) {
 		repo = &cgit_repolist.repos[i];
 		if (!strcmp(repo->url, url))
 			return repo;
 	}
 	return NULL;
 }

 void cgit_global_config_cb(const char *name, const char *value)
 {
 	if (!strcmp(name, "root-title"))
 		cgit_root_title = xstrdup(value);
 	else if (!strcmp(name, "css"))
 		cgit_css = xstrdup(value);
 	else if (!strcmp(name, "logo"))
 		cgit_logo = xstrdup(value);
 	else if (!strcmp(name, "index-header"))
 		cgit_index_header = xstrdup(value);
 	else if (!strcmp(name, "logo-link"))
 		cgit_logo_link = xstrdup(value);
 	else if (!strcmp(name, "module-link"))
 		cgit_module_link = xstrdup(value);
 	else if (!strcmp(name, "virtual-root"))
 		cgit_virtual_root = xstrdup(value);
 	else if (!strcmp(name, "nocache"))
 		cgit_nocache = atoi(value);
 	else if (!strcmp(name, "snapshots"))
 		cgit_snapshots = atoi(value);
 	else if (!strcmp(name, "enable-log-filecount"))
 		cgit_enable_log_filecount = atoi(value);
 	else if (!strcmp(name, "enable-log-linecount"))
 		cgit_enable_log_linecount = atoi(value);
 	else if (!strcmp(name, "cache-root"))
 		cgit_cache_root = xstrdup(value);
 	else if (!strcmp(name, "cache-root-ttl"))
 		cgit_cache_root_ttl = atoi(value);
 	else if (!strcmp(name, "cache-repo-ttl"))
 		cgit_cache_repo_ttl = atoi(value);
 	else if (!strcmp(name, "cache-static-ttl"))
 		cgit_cache_static_ttl = atoi(value);
 	else if (!strcmp(name, "cache-dynamic-ttl"))
 		cgit_cache_dynamic_ttl = atoi(value);
 	else if (!strcmp(name, "max-message-length"))
 		cgit_max_msg_len = atoi(value);
 	else if (!strcmp(name, "max-repodesc-length"))
 		cgit_max_repodesc_len = atoi(value);
 	else if (!strcmp(name, "max-commit-count"))
 		cgit_max_commit_count = atoi(value);
 	else if (!strcmp(name, "summary-log"))
 		cgit_summary_log = atoi(value);
 	else if (!strcmp(name, "agefile"))
 		cgit_agefile = xstrdup(value);
 	else if (!strcmp(name, "repo.group"))
 		cgit_repo_group = xstrdup(value);
 	else if (!strcmp(name, "repo.url"))
 		cgit_repo = add_repo(value);
 	else if (!strcmp(name, "repo.name"))
 		cgit_repo->name = xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.path"))
 		cgit_repo->path = xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.desc"))
 		cgit_repo->desc = xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.owner"))
 		cgit_repo->owner = xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.defbranch"))
 		cgit_repo->defbranch = xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.snapshots"))
 		cgit_repo->snapshots = cgit_snapshots * atoi(value);
 	else if (cgit_repo && !strcmp(name, "repo.enable-log-filecount"))
 		cgit_repo->enable_log_filecount = cgit_enable_log_filecount * atoi(value);
 	else if (cgit_repo && !strcmp(name, "repo.enable-log-linecount"))
 		cgit_repo->enable_log_linecount = cgit_enable_log_linecount * atoi(value);
 	else if (cgit_repo && !strcmp(name, "repo.module-link"))
 		cgit_repo->module_link= xstrdup(value);
 	else if (cgit_repo && !strcmp(name, "repo.readme") && value != NULL) {
 		if (*value == '/')
 			cgit_repo->readme = xstrdup(value);
 		else
 			cgit_repo->readme = xstrdup(fmt("%s/%s", cgit_repo->path, value));
 	} else if (!strcmp(name, "include"))
 		cgit_read_config(value, cgit_global_config_cb);
 }

 void cgit_querystring_cb(const char *name, const char *value)
 {
 	if (!strcmp(name,"r")) {
 		cgit_query_repo = xstrdup(value);
 		cgit_repo = cgit_get_repoinfo(value);
 	} else if (!strcmp(name, "p")) {
 		cgit_query_page = xstrdup(value);
 		cgit_cmd = cgit_get_cmd_index(value);
 	} else if (!strcmp(name, "url")) {
 		cgit_parse_url(value);
 	} else if (!strcmp(name, "q")) {
 		cgit_query_search = xstrdup(value);
 	} else if (!strcmp(name, "h")) {
 		cgit_query_head = xstrdup(value);
 		cgit_query_has_symref = 1;
 	} else if (!strcmp(name, "id")) {
 		cgit_query_sha1 = xstrdup(value);
 		cgit_query_has_sha1 = 1;
 	} else if (!strcmp(name, "id2")) {
 		cgit_query_sha2 = xstrdup(value);
 		cgit_query_has_sha1 = 1;
 	} else if (!strcmp(name, "ofs")) {
 		cgit_query_ofs = atoi(value);
 	} else if (!strcmp(name, "path")) {
 		cgit_query_path = xstrdup(value);
 	} else if (!strcmp(name, "name")) {
 		cgit_query_name = xstrdup(value);
 	}
 }

 void *cgit_free_commitinfo(struct commitinfo *info)
 {
 	free(info->author);
 	free(info->author_email);
 	free(info->committer);
 	free(info->committer_email);
 	free(info->subject);
 	free(info);
 	return NULL;
 }

 int hextoint(char c)
 {
 	if (c >= 'a' && c <= 'f')
 		return 10 + c - 'a';
 	else if (c >= 'A' && c <= 'F')
 		return 10 + c - 'A';
 	else if (c >= '0' && c <= '9')
 		return c - '0';
 	else
 		return -1;
 }

 void cgit_diff_tree_cb(struct diff_queue_struct *q,
 		       struct diff_options *options, void *data)
 {
 	int i;

 	for (i = 0; i < q->nr; i++) {
 		if (q->queue[i]->status == 'U')
 			continue;
 		((filepair_fn)data)(q->queue[i]);
 	}
 }

 static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
 {
 	enum object_type type;

 	if (is_null_sha1(sha1)) {
 		file->ptr = (char *)"";
 		file->size = 0;
 	} else {
 		file->ptr = read_sha1_file(sha1, &type, &file->size);
 	}
 	return 1;
 }

 /*
  * Receive diff-buffers from xdiff and concatenate them as
  * needed across multiple callbacks.
  *
  * This is basically a copy of xdiff-interface.c/xdiff_outf(),
  * ripped from git and modified to use globals instead of
  * a special callback-struct.
  */
 char *diffbuf = NULL;
 int buflen = 0;

 int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
 {
 	int i;

 	for (i = 0; i < nbuf; i++) {
 		if (mb[i].ptr[mb[i].size-1] != '\n') {
 			/* Incomplete line */
 			diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 			memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 			buflen += mb[i].size;
 			continue;
 		}

 		/* we have a complete line */
 		if (!diffbuf) {
 			((linediff_fn)priv)(mb[i].ptr, mb[i].size);
 			continue;
 		}
 		diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
 		memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
 		((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
 		free(diffbuf);
 		diffbuf = NULL;
 		buflen = 0;
 	}
 	if (diffbuf) {
 		((linediff_fn)priv)(diffbuf, buflen);
 		free(diffbuf);
 		diffbuf = NULL;
 		buflen = 0;
 	}
 	return 0;
 }

 int cgit_diff_files(const unsigned char *old_sha1,
 		     const unsigned char *new_sha1,
 		     linediff_fn fn)
 {
 	mmfile_t file1, file2;
 	xpparam_t diff_params;
 	xdemitconf_t emit_params;
 	xdemitcb_t emit_cb;

 	if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
 		return 1;

 	diff_params.flags = XDF_NEED_MINIMAL;
 	emit_params.ctxlen = 3;
 	emit_params.flags = XDL_EMIT_FUNCNAMES;
 	emit_cb.outf = filediff_cb;
 	emit_cb.priv = fn;
 	xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
 	return 0;
 }

 void cgit_diff_tree(const unsigned char *old_sha1,
 		    const unsigned char *new_sha1,
 		    filepair_fn fn)
 {
 	struct diff_options opt;
 	int ret;

 	diff_setup(&opt);
 	opt.output_format = DIFF_FORMAT_CALLBACK;
 	opt.detect_rename = 1;
 	opt.recursive = 1;
 	opt.format_callback = cgit_diff_tree_cb;
 	opt.format_callback_data = fn;
 	diff_setup_done(&opt);

 	if (old_sha1)
 		ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
 	else
 		ret = diff_root_tree_sha1(new_sha1, "", &opt);
 	diffcore_std(&opt);
 	diff_flush(&opt);
 }

 void cgit_diff_commit(struct commit *commit, filepair_fn fn)
 {
 	unsigned char *old_sha1 = NULL;

 	if (commit->parents)
 		old_sha1 = commit->parents->item->object.sha1;
 	cgit_diff_tree(old_sha1, commit->object.sha1, fn);
 }
	/* shared.c: global vars + some callback functions
	*
	* Copyright (C) 2006 Lars Hjemli
	*
	* Licensed under GNU General Public License v2
	* (see COPYING for full license text)
	*/

	#include "cgit.h"

	struct repolist cgit_repolist;
	struct repoinfo *cgit_repo;
	int cgit_cmd;

	char *cgit_root_title = "Git repository browser";
	char *cgit_css = "/cgit.css";
	char *cgit_logo = "/git-logo.png";
	char *cgit_index_header = NULL;
	char *cgit_logo_link = "http://www.kernel.org/pub/software/scm/git/docs/";
	char *cgit_module_link = "./?repo=%s&page=commit&id=%s";
	char *cgit_agefile = "info/web/last-modified";
	char *cgit_virtual_root = NULL;
	char *cgit_script_name = CGIT_SCRIPT_NAME;
	char *cgit_cache_root = "/var/cache/cgit";
	char *cgit_repo_group = NULL;

	int cgit_nocache = 0;
	int cgit_snapshots = 0;
	int cgit_enable_log_filecount = 0;
	int cgit_enable_log_linecount = 0;
	int cgit_max_lock_attempts = 5;
	int cgit_cache_root_ttl = 5;
	int cgit_cache_repo_ttl = 5;
	int cgit_cache_dynamic_ttl = 5;
	int cgit_cache_static_ttl = -1;
	int cgit_cache_max_create_time = 5;
	int cgit_summary_log = 0;

	int cgit_max_msg_len = 60;
	int cgit_max_repodesc_len = 60;
	int cgit_max_commit_count = 50;

	int cgit_query_has_symref = 0;
	int cgit_query_has_sha1 = 0;

	char *cgit_querystring = NULL;
	char *cgit_query_repo = NULL;
	char *cgit_query_page = NULL;
	char *cgit_query_head = NULL;
	char *cgit_query_search = NULL;
	char *cgit_query_sha1 = NULL;
	char *cgit_query_sha2 = NULL;
	char *cgit_query_path = NULL;
	char *cgit_query_name = NULL;
	int cgit_query_ofs = 0;

	int htmlfd = 0;


	int cgit_get_cmd_index(const char *cmd)
	{
	static char *cmds[] = {"log", "commit", "diff", "tree", "view", "blob", "snapshot", NULL};
	int i;

	for(i = 0; cmds[i]; i++)
	if (!strcmp(cmd, cmds[i]))
	return i + 1;
	return 0;
	}

	int chk_zero(int result, char *msg)
	{
	if (result != 0)
	die("%s: %s", msg, strerror(errno));
	return result;
	}

	int chk_positive(int result, char *msg)
	{
	if (result <= 0)
	die("%s: %s", msg, strerror(errno));
	return result;
	}

	struct repoinfo add_repo(const char url)
	{
	struct repoinfo *ret;

	if (++cgit_repolist.count > cgit_repolist.length) {
	if (cgit_repolist.length == 0)
	cgit_repolist.length = 8;
	else
	cgit_repolist.length *= 2;
	cgit_repolist.repos = xrealloc(cgit_repolist.repos,
	cgit_repolist.length *
	sizeof(struct repoinfo));
	}

	ret = &cgit_repolist.repos[cgit_repolist.count-1];
	ret->url = xstrdup(url);
	ret->name = ret->url;
	ret->path = NULL;
	ret->desc = NULL;
	ret->owner = NULL;
	ret->group = cgit_repo_group;
	ret->defbranch = "master";
	ret->snapshots = cgit_snapshots;
	ret->enable_log_filecount = cgit_enable_log_filecount;
	ret->enable_log_linecount = cgit_enable_log_linecount;
	ret->module_link = cgit_module_link;
	ret->readme = NULL;
	return ret;
	}

	struct repoinfo cgit_get_repoinfo(const char url)
	{
	int i;
	struct repoinfo *repo;

	for (i=0; i<cgit_repolist.count; i++) {
	repo = &cgit_repolist.repos[i];
	if (!strcmp(repo->url, url))
	return repo;
	}
	return NULL;
	}

	void cgit_global_config_cb(const char name, const char value)
	{
	if (!strcmp(name, "root-title"))
	cgit_root_title = xstrdup(value);
	else if (!strcmp(name, "css"))
	cgit_css = xstrdup(value);
	else if (!strcmp(name, "logo"))
	cgit_logo = xstrdup(value);
	else if (!strcmp(name, "index-header"))
	cgit_index_header = xstrdup(value);
	else if (!strcmp(name, "logo-link"))
	cgit_logo_link = xstrdup(value);
	else if (!strcmp(name, "module-link"))
	cgit_module_link = xstrdup(value);
	else if (!strcmp(name, "virtual-root"))
	cgit_virtual_root = xstrdup(value);
	else if (!strcmp(name, "nocache"))
	cgit_nocache = atoi(value);
	else if (!strcmp(name, "snapshots"))
	cgit_snapshots = atoi(value);
	else if (!strcmp(name, "enable-log-filecount"))
	cgit_enable_log_filecount = atoi(value);
	else if (!strcmp(name, "enable-log-linecount"))
	cgit_enable_log_linecount = atoi(value);
	else if (!strcmp(name, "cache-root"))
	cgit_cache_root = xstrdup(value);
	else if (!strcmp(name, "cache-root-ttl"))
	cgit_cache_root_ttl = atoi(value);
	else if (!strcmp(name, "cache-repo-ttl"))
	cgit_cache_repo_ttl = atoi(value);
	else if (!strcmp(name, "cache-static-ttl"))
	cgit_cache_static_ttl = atoi(value);
	else if (!strcmp(name, "cache-dynamic-ttl"))
	cgit_cache_dynamic_ttl = atoi(value);
	else if (!strcmp(name, "max-message-length"))
	cgit_max_msg_len = atoi(value);
	else if (!strcmp(name, "max-repodesc-length"))
	cgit_max_repodesc_len = atoi(value);
	else if (!strcmp(name, "max-commit-count"))
	cgit_max_commit_count = atoi(value);
	else if (!strcmp(name, "summary-log"))
	cgit_summary_log = atoi(value);
	else if (!strcmp(name, "agefile"))
	cgit_agefile = xstrdup(value);
	else if (!strcmp(name, "repo.group"))
	cgit_repo_group = xstrdup(value);
	else if (!strcmp(name, "repo.url"))
	cgit_repo = add_repo(value);
	else if (!strcmp(name, "repo.name"))
	cgit_repo->name = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.path"))
	cgit_repo->path = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.desc"))
	cgit_repo->desc = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.owner"))
	cgit_repo->owner = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.defbranch"))
	cgit_repo->defbranch = xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.snapshots"))
	cgit_repo->snapshots = cgit_snapshots * atoi(value);
	else if (cgit_repo && !strcmp(name, "repo.enable-log-filecount"))
	cgit_repo->enable_log_filecount = cgit_enable_log_filecount * atoi(value);
	else if (cgit_repo && !strcmp(name, "repo.enable-log-linecount"))
	cgit_repo->enable_log_linecount = cgit_enable_log_linecount * atoi(value);
	else if (cgit_repo && !strcmp(name, "repo.module-link"))
	cgit_repo->module_link= xstrdup(value);
	else if (cgit_repo && !strcmp(name, "repo.readme") && value != NULL) {
	if (*value == '/')
	cgit_repo->readme = xstrdup(value);
	else
	cgit_repo->readme = xstrdup(fmt("%s/%s", cgit_repo->path, value));
	} else if (!strcmp(name, "include"))
	cgit_read_config(value, cgit_global_config_cb);
	}

	void cgit_querystring_cb(const char name, const char value)
	{
	if (!strcmp(name,"r")) {
	cgit_query_repo = xstrdup(value);
	cgit_repo = cgit_get_repoinfo(value);
	} else if (!strcmp(name, "p")) {
	cgit_query_page = xstrdup(value);
	cgit_cmd = cgit_get_cmd_index(value);
	} else if (!strcmp(name, "url")) {
	cgit_parse_url(value);
	} else if (!strcmp(name, "q")) {
	cgit_query_search = xstrdup(value);
	} else if (!strcmp(name, "h")) {
	cgit_query_head = xstrdup(value);
	cgit_query_has_symref = 1;
	} else if (!strcmp(name, "id")) {
	cgit_query_sha1 = xstrdup(value);
	cgit_query_has_sha1 = 1;
	} else if (!strcmp(name, "id2")) {
	cgit_query_sha2 = xstrdup(value);
	cgit_query_has_sha1 = 1;
	} else if (!strcmp(name, "ofs")) {
	cgit_query_ofs = atoi(value);
	} else if (!strcmp(name, "path")) {
	cgit_query_path = xstrdup(value);
	} else if (!strcmp(name, "name")) {
	cgit_query_name = xstrdup(value);
	}
	}

	void cgit_free_commitinfo(struct commitinfo info)
	{
	free(info->author);
	free(info->author_email);
	free(info->committer);
	free(info->committer_email);
	free(info->subject);
	free(info);
	return NULL;
	}

	int hextoint(char c)
	{
	if (c >= 'a' && c <= 'f')
	return 10 + c - 'a';
	else if (c >= 'A' && c <= 'F')
	return 10 + c - 'A';
	else if (c >= '0' && c <= '9')
	return c - '0';
	else
	return -1;
	}

	void cgit_diff_tree_cb(struct diff_queue_struct *q,
	struct diff_options options, void data)
	{
	int i;

	for (i = 0; i < q->nr; i++) {
	if (q->queue[i]->status == 'U')
	continue;
	((filepair_fn)data)(q->queue[i]);
	}
	}

	static int load_mmfile(mmfile_t file, const unsigned char sha1)
	{
	enum object_type type;

	if (is_null_sha1(sha1)) {
	file->ptr = (char *)"";
	file->size = 0;
	} else {
	file->ptr = read_sha1_file(sha1, &type, &file->size);
	}
	return 1;
	}

	/*
	* Receive diff-buffers from xdiff and concatenate them as
	* needed across multiple callbacks.
	*
	* This is basically a copy of xdiff-interface.c/xdiff_outf(),
	* ripped from git and modified to use globals instead of
	* a special callback-struct.
	*/
	char *diffbuf = NULL;
	int buflen = 0;

	int filediff_cb(void priv, mmbuffer_t mb, int nbuf)
	{
	int i;

	for (i = 0; i < nbuf; i++) {
	if (mb[i].ptr[mb[i].size-1] != '\n') {
	/* Incomplete line */
	diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
	memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
	buflen += mb[i].size;
	continue;
	}

	/* we have a complete line */
	if (!diffbuf) {
	((linediff_fn)priv)(mb[i].ptr, mb[i].size);
	continue;
	}
	diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
	memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
	((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
	free(diffbuf);
	diffbuf = NULL;
	buflen = 0;
	}
	if (diffbuf) {
	((linediff_fn)priv)(diffbuf, buflen);
	free(diffbuf);
	diffbuf = NULL;
	buflen = 0;
	}
	return 0;
	}

	int cgit_diff_files(const unsigned char *old_sha1,
	const unsigned char *new_sha1,
	linediff_fn fn)
	{
	mmfile_t file1, file2;
	xpparam_t diff_params;
	xdemitconf_t emit_params;
	xdemitcb_t emit_cb;

	if (!load_mmfile(&file1, old_sha1) \|\| !load_mmfile(&file2, new_sha1))
	return 1;

	diff_params.flags = XDF_NEED_MINIMAL;
	emit_params.ctxlen = 3;
	emit_params.flags = XDL_EMIT_FUNCNAMES;
	emit_cb.outf = filediff_cb;
	emit_cb.priv = fn;
	xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
	return 0;
	}

	void cgit_diff_tree(const unsigned char *old_sha1,
	const unsigned char *new_sha1,
	filepair_fn fn)
	{
	struct diff_options opt;
	int ret;

	diff_setup(&opt);
	opt.output_format = DIFF_FORMAT_CALLBACK;
	opt.detect_rename = 1;
	opt.recursive = 1;
	opt.format_callback = cgit_diff_tree_cb;
	opt.format_callback_data = fn;
	diff_setup_done(&opt);

	if (old_sha1)
	ret = diff_tree_sha1(old_sha1, new_sha1, "", &opt);
	else
	ret = diff_root_tree_sha1(new_sha1, "", &opt);
	diffcore_std(&opt);
	diff_flush(&opt);
	}

	void cgit_diff_commit(struct commit *commit, filepair_fn fn)
	{
	unsigned char *old_sha1 = NULL;

	if (commit->parents)
	old_sha1 = commit->parents->item->object.sha1;
	cgit_diff_tree(old_sha1, commit->object.sha1, fn);
	}