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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-01-20 00:16:25 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-01-20 00:16:25 +0100
commitff291bdc716769edab04e70ccbd8ceffe73a9336 (patch)
tree33978b18ff3a3baca2f69fcec4b70421b02fcea6
parent10bc3aba90df55e5f59aeef9b1d4d32b07211854 (diff)
An attempt at cleaning sqfsbrowse a little and adding explanations
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
-rw-r--r--extras/browse.c42
1 files changed, 33 insertions, 9 deletions
diff --git a/extras/browse.c b/extras/browse.c
index 79042eb..6992a4b 100644
--- a/extras/browse.c
+++ b/extras/browse.c
@@ -5,6 +5,7 @@
#include "sqfs/inode.h"
#include "sqfs/super.h"
#include "sqfs/error.h"
+#include "sqfs/block.h"
#include "sqfs/dir.h"
#include "sqfs/io.h"
@@ -23,6 +24,8 @@ static sqfs_inode_generic_t *working_dir;
static sqfs_id_table_t *idtbl;
static sqfs_data_reader_t *data;
+/*****************************************************************************/
+
static void change_directory(const char *dirname)
{
sqfs_inode_generic_t *inode;
@@ -43,6 +46,8 @@ static void change_directory(const char *dirname)
}
}
+/*****************************************************************************/
+
static void list_directory(const char *dirname)
{
sqfs_inode_generic_t *root, *inode;
@@ -50,6 +55,7 @@ static void list_directory(const char *dirname)
sqfs_dir_entry_t *ent;
int ret;
+ /* Get the directory inode we want to dump and open the directory */
if (dirname == NULL) {
ret = sqfs_dir_reader_open_dir(dr, working_dir);
if (ret)
@@ -78,6 +84,7 @@ static void list_directory(const char *dirname)
goto fail_open;
}
+ /* first pass over the directory to figure out column count/length */
for (max_len = 0; ; max_len = len > max_len ? len : max_len) {
ret = sqfs_dir_reader_read(dr, &ent);
if (ret > 0)
@@ -92,12 +99,13 @@ static void list_directory(const char *dirname)
free(ent);
}
- sqfs_dir_reader_rewind(dr);
-
col_count = 79 / (max_len + 1);
col_count = col_count < 1 ? 1 : col_count;
i = 0;
+ /* second pass for printing directory contents */
+ sqfs_dir_reader_rewind(dr);
+
for (;;) {
ret = sqfs_dir_reader_read(dr, &ent);
if (ret > 0)
@@ -108,6 +116,7 @@ static void list_directory(const char *dirname)
break;
}
+ /* entries always use basic types only */
switch (ent->type) {
case SQFS_INODE_DIR:
fputs("\033[01;34m", stdout);
@@ -158,6 +167,8 @@ fail_resolve:
return;
}
+/*****************************************************************************/
+
static void mode_to_str(sqfs_u16 mode, char *p)
{
*(p++) = (mode & SQFS_INODE_OWNER_R) ? 'r' : '-';
@@ -205,6 +216,7 @@ static void stat_cmd(const char *filename)
size_t i;
int ret;
+ /* get the inode we are interested in */
if (filename == NULL) {
printf("Missing argument: file name\n");
return;
@@ -223,8 +235,7 @@ static void stat_cmd(const char *filename)
goto fail_resolve;
}
- printf("Stat: %s\n", filename);
-
+ /* some basic information */
switch (inode->base.type) {
case SQFS_INODE_DIR: type = "directory"; break;
case SQFS_INODE_FILE: type = "file"; break;
@@ -243,6 +254,7 @@ static void stat_cmd(const char *filename)
default: type = "UNKNOWN"; break;
}
+ printf("Stat: %s\n", filename);
printf("Type: %s\n", type);
printf("Inode number: %u\n", inode->base.inode_number);
@@ -250,6 +262,7 @@ static void stat_cmd(const char *filename)
printf("Access: 0%o/%s\n", inode->base.mode & ~SQFS_INODE_MODE_MASK,
buffer);
+ /* resolve and print UID/GID */
if (sqfs_id_table_index_to_id(idtbl, inode->base.uid_idx, &uid)) {
strcpy(buffer, "-- error --");
} else {
@@ -266,11 +279,13 @@ static void stat_cmd(const char *filename)
printf("GID: %s (index = %u)\n", buffer, inode->base.gid_idx);
+ /* last modification time stamp */
timeval = inode->base.mod_time;
tm = gmtime(&timeval);
strftime(buffer, sizeof(buffer), "%a, %d %b %Y %T %z", tm);
printf("Last modified: %s (%u)\n", buffer, inode->base.mod_time);
+ /* inode type specific data */
switch (inode->base.type) {
case SQFS_INODE_BDEV:
case SQFS_INODE_CDEV:
@@ -315,9 +330,9 @@ static void stat_cmd(const char *filename)
for (i = 0; i < inode->num_file_blocks; ++i) {
printf("\tBlock #%lu size: %u (%s)\n", (unsigned long)i,
- inode->extra[i] & 0x00FFFFFF,
- inode->extra[i] & (1 << 24) ?
- "uncompressed" : "compressed");
+ SQFS_ON_DISK_BLOCK_SIZE(inode->extra[i]),
+ SQFS_IS_BLOCK_COMPRESSED(inode->extra[i]) ?
+ "compressed" : "uncompressed");
}
break;
case SQFS_INODE_EXT_FILE:
@@ -336,8 +351,8 @@ static void stat_cmd(const char *filename)
for (i = 0; i < inode->num_file_blocks; ++i) {
printf("\tBlock #%lu size: %u (%s)\n", (unsigned long)i,
- inode->extra[i] & 0x00FFFFFF,
- inode->extra[i] & (1 << 24) ?
+ SQFS_ON_DISK_BLOCK_SIZE(inode->extra[i]),
+ SQFS_IS_BLOCK_COMPRESSED(inode->extra[i]) ?
"compressed" : "uncompressed");
}
break;
@@ -361,6 +376,7 @@ static void stat_cmd(const char *filename)
if (inode->data.dir_ext.size == 0)
break;
+ /* dump the extended directories fast-lookup index */
for (i = 0; ; ++i) {
ret = sqfs_inode_unpack_dir_index_entry(inode, &idx, i);
if (ret == SQFS_ERROR_OUT_OF_BOUNDS)
@@ -388,6 +404,8 @@ fail_resolve:
return;
}
+/*****************************************************************************/
+
static void cat_cmd(const char *filename)
{
sqfs_inode_generic_t *inode, *root;
@@ -396,6 +414,7 @@ static void cat_cmd(const char *filename)
sqfs_s32 diff;
int ret;
+ /* get the inode of the file */
if (filename == NULL) {
printf("Missing argument: file name\n");
return;
@@ -415,6 +434,10 @@ static void cat_cmd(const char *filename)
return;
}
+ /* Use the high level read-like function that uses the data-reader
+ * internal cache. There are also other functions for direct block
+ * or fragment access.
+ */
for (;;) {
diff = sqfs_data_reader_read(data, inode, offset, buffer,
sizeof(buffer));
@@ -431,6 +454,7 @@ static void cat_cmd(const char *filename)
}
}
+/*****************************************************************************/
static const struct {
const char *cmd;