commit f3461dcc300362c46830f33ae4d9b34357ff37fa
Author: Christophe Fergeau <[email protected]>
Date: Sun Oct 18 11:51:56 2009 +0200
preliminary cbk generation
The Locations.cbk file is used as a checksum for the Locations.itdb file.
This commit adds the calculation of the sha1s it's made of but is missing
the
final signature which is added to the 1st 46 bytes of this file.
src/itdb_sqlite.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 109 insertions(+), 0 deletions(-)
---
diff --git a/src/itdb_sqlite.c b/src/itdb_sqlite.c
index 30c6d4c..16c593c 100644
--- a/src/itdb_sqlite.c
+++ b/src/itdb_sqlite.c
@@ -1150,6 +1150,114 @@ leave:
}
}
+static int cbk_calc_sha1_one_block (FILE *f, unsigned char sha1[20])
+{
+ const guint BLOCK_SIZE = 1024;
+ unsigned char block[BLOCK_SIZE];
+ size_t read_count;
+ GChecksum *checksum;
+ gsize sha1_len;
+
+ read_count = fread (block, BLOCK_SIZE, 1, f);
+ if ((read_count != 1)) {
+ if (feof (f)) {
+ return 1;
+ } else {
+ return -1;
+ }
+ }
+
+ g_assert (g_checksum_type_get_length (G_CHECKSUM_SHA1) == sizeof (sha1));
+ sha1_len = sizeof (sha1);
+ checksum = g_checksum_new (G_CHECKSUM_SHA1);
+ g_checksum_update (checksum, block, BLOCK_SIZE);
+ g_checksum_get_digest (checksum, sha1, &sha1_len);
+ g_assert (sha1_len == sizeof (sha1));
+ g_checksum_free (checksum);
+
+ return 0;
+}
+
+static gboolean cbk_calc_sha1s (const char *filename, GArray *sha1s)
+{
+ FILE *f;
+ int calc_ok;
+
+ f = fopen (filename, "rb");
+ if (f == NULL) {
+ return FALSE;
+ }
+
+ do {
+ unsigned char sha1[20];
+ calc_ok = cbk_calc_sha1_one_block (f, sha1);
+ if (calc_ok != 0) {
+ break;
+ }
+ g_array_append_vals (sha1s, sha1, sizeof(sha1));
+ } while (calc_ok == 0);
+
+ if (calc_ok < 0) {
+ goto error;
+ }
+
+ fclose (f);
+ return TRUE;
+
+error:
+ fclose (f);
+ return FALSE;
+}
+
+static const guint CBK_HEADER_SIZE = 46;
+
+static void cbk_calc_sha1_of_sha1s (GArray *cbk)
+{
+ GChecksum *checksum;
+ unsigned char* final_sha1;
+ unsigned char* sha1s;
+ gsize final_sha1_len;
+
+ g_assert (cbk->len > CBK_HEADER_SIZE + 20);
+
+ final_sha1 = g_array_index(cbk, unsigned char *, CBK_HEADER_SIZE);
+ sha1s = g_array_index (cbk, unsigned char *, CBK_HEADER_SIZE + 20);
+ final_sha1_len = g_checksum_type_get_length (G_CHECKSUM_SHA1);
+ g_assert (final_sha1_len == 20);
+
+ checksum = g_checksum_new (G_CHECKSUM_SHA1);
+ g_checksum_update (checksum, sha1s, cbk->len - (CBK_HEADER_SIZE + 20));
+ g_checksum_get_digest (checksum, final_sha1, &final_sha1_len);
+ g_checksum_free (checksum);
+}
+
+static gboolean mk_Locations_cbk (const char *dirname)
+{
+ char *locations_filename;
+ char *cbk_filename;
+ GArray *cbk;
+ gboolean success;
+
+ cbk = g_array_sized_new (FALSE, TRUE, 1,
+ CBK_HEADER_SIZE + 20);
+ g_array_set_size (cbk, CBK_HEADER_SIZE + 20);
+
+ locations_filename = g_build_filename (dirname, "Locations.itdb", NULL);
+ success = cbk_calc_sha1s (locations_filename, cbk);
+ g_free (locations_filename);
+ if (!success) {
+ g_array_free (cbk, TRUE);
+ return FALSE;
+ }
+ cbk_calc_sha1_of_sha1s (cbk);
+
+ cbk_filename = g_build_filename (dirname, "Locations.itdb.cbk", NULL);
+ success = g_file_set_contents (cbk_filename, cbk->data, cbk->len, NULL);
+ g_free (cbk_filename);
+ g_array_free (cbk, TRUE);
+ return success;
+}
+
static void build_itdb_files(Itdb_iTunesDB *itdb,
GHashTable *album_ids, GHashTable *artist_ids,
const char *outpath, const char *uuid)
@@ -1159,6 +1267,7 @@ static void build_itdb_files(Itdb_iTunesDB *itdb,
mk_Genius(itdb, outpath);
mk_Library(itdb, album_ids, artist_ids, outpath);
mk_Locations(itdb, outpath, uuid);
+ mk_Locations_cbk(outpath);
}
static int ensure_itlp_dir_exists(const char *itlpdir)
------------------------------------------------------------------------------
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