1/* ui-blob.c: show blob content
  2 *
  3 * Copyright (C) 2008 Lars Hjemli
  4 * Copyright (C) 2010 Jason A. Donenfeld <Jason@zx2c4.com>
  5 *
  6 * Licensed under GNU General Public License v2
  7 *   (see COPYING for full license text)
  8 */
  9
 10#include "cgit.h"
 11#include "html.h"
 12#include "ui-shared.h"
 13
 14struct walk_tree_context {
 15	char *match_path;
 16	unsigned char *matched_sha1;
 17	int found_path;
 18};
 19
 20static int walk_tree(const unsigned char *sha1, const char *base, int baselen,
 21	const char *pathname, unsigned mode, int stage, void *cbdata)
 22{
 23	struct walk_tree_context *walk_tree_ctx = cbdata;
 24
 25	if (strncmp(base, walk_tree_ctx->match_path, baselen)
 26		|| strcmp(walk_tree_ctx->match_path + baselen, pathname))
 27		return READ_TREE_RECURSIVE;
 28	memmove(walk_tree_ctx->matched_sha1, sha1, 20);
 29	walk_tree_ctx->found_path = 1;
 30	return 0;
 31}
 32
 33int cgit_print_file(char *path, const char *head)
 34{
 35	unsigned char sha1[20];
 36	enum object_type type;
 37	char *buf;
 38	unsigned long size;
 39	struct commit *commit;
 40	struct pathspec_item path_items = {
 41		.match = path,
 42		.len = strlen(path)
 43	};
 44	struct pathspec paths = {
 45		.nr = 1,
 46		.items = &path_items
 47	};
 48	struct walk_tree_context walk_tree_ctx = {
 49		.match_path = path,
 50		.matched_sha1 = sha1,
 51		.found_path = 0
 52	};
 53
 54	if (get_sha1(head, sha1))
 55		return -1;
 56	type = sha1_object_info(sha1, &size);
 57	if (type == OBJ_COMMIT && path) {
 58		commit = lookup_commit_reference(sha1);
 59		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 60		if (!walk_tree_ctx.found_path)
 61			return -1;
 62		type = sha1_object_info(sha1, &size);
 63	}
 64	if (type == OBJ_BAD)
 65		return -1;
 66	buf = read_sha1_file(sha1, &type, &size);
 67	if (!buf)
 68		return -1;
 69	buf[size] = '\0';
 70	html_raw(buf, size);
 71	return 0;
 72}
 73
 74void cgit_print_blob(const char *hex, char *path, const char *head)
 75{
 76	unsigned char sha1[20];
 77	enum object_type type;
 78	char *buf;
 79	unsigned long size;
 80	struct commit *commit;
 81	struct pathspec_item path_items = {
 82		.match = path,
 83		.len = path ? strlen(path) : 0
 84	};
 85	struct pathspec paths = {
 86		.nr = 1,
 87		.items = &path_items
 88	};
 89	struct walk_tree_context walk_tree_ctx = {
 90		.match_path = path,
 91		.matched_sha1 = sha1,
 92	};
 93
 94	if (hex) {
 95		if (get_sha1_hex(hex, sha1)) {
 96			cgit_print_error(fmt("Bad hex value: %s", hex));
 97			return;
 98		}
 99	} else {
100		if (get_sha1(head, sha1)) {
101			cgit_print_error(fmt("Bad ref: %s", head));
102			return;
103		}
104	}
105
106	type = sha1_object_info(sha1, &size);
107
108	if ((!hex) && type == OBJ_COMMIT && path) {
109		commit = lookup_commit_reference(sha1);
110		read_tree_recursive(commit->tree, "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
111		type = sha1_object_info(sha1,&size);
112	}
113
114	if (type == OBJ_BAD) {
115		cgit_print_error(fmt("Bad object name: %s", hex));
116		return;
117	}
118
119	buf = read_sha1_file(sha1, &type, &size);
120	if (!buf) {
121		cgit_print_error(fmt("Error reading object %s", hex));
122		return;
123	}
124
125	buf[size] = '\0';
126	ctx.page.mimetype = ctx.qry.mimetype;
127	if (!ctx.page.mimetype) {
128		if (buffer_is_binary(buf, size))
129			ctx.page.mimetype = "application/octet-stream";
130		else
131			ctx.page.mimetype = "text/plain";
132	}
133	ctx.page.filename = path;
134	cgit_print_http_headers(&ctx);
135	html_raw(buf, size);
136}