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libarchive: add a function to unpack embedded data

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Similar code to unpack embedded data is used to decompress usage
messages, embedded scripts and the config file (in the non-default
bbconfig applet).

Moving this code to a common function reduces the size of the default
build and hides more of the internals of libarchive.

function                                             old     new   delta
unpack_bz2_data                                        -     135    +135
bb_show_usage                                        137     157     +20
get_script_content                                    32      47     +15
unpack_scripts                                       119       -    -119
unpack_usage_messages                                124       -    -124
------------------------------------------------------------------------------
(add/remove: 1/2 grow/shrink: 2/0 up/down: 170/-243)          Total: -73 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston
2018-11-02 14:14:31 +01:00
committed by Denys Vlasenko
parent 0df289f427
commit c339c7f7b3
4 changed files with 54 additions and 99 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
archival/libarchive/decompress_bunzip2.c
View File

@@ -107,7 +107,7 @@ struct bunzip_data {
uint8_t selectors[32768]; /* nSelectors=15 bits */
struct group_data groups[MAX_GROUPS]; /* Huffman coding tables */
};
/* typedef struct bunzip_data bunzip_data; -- done in .h file */
typedef struct bunzip_data bunzip_data;
/* Return the next nnn bits of input. All reads from the compressed input
@@ -575,7 +575,7 @@ static int get_next_block(bunzip_data *bd)
in outbuf. IOW: on EOF returns len ("all bytes are not filled"), not 0.
(Why? This allows to get rid of one local variable)
*/
int FAST_FUNC read_bunzip(bunzip_data *bd, char *outbuf, int len)
static int FAST_FUNC read_bunzip(bunzip_data *bd, char *outbuf, int len)
{
const uint32_t *dbuf;
int pos, current, previous;
@@ -699,7 +699,7 @@ int FAST_FUNC read_bunzip(bunzip_data *bd, char *outbuf, int len)
/* Because bunzip2 is used for help text unpacking, and because bb_show_usage()
should work for NOFORK applets too, we must be extremely careful to not leak
any allocations! */
int FAST_FUNC start_bunzip(
static int FAST_FUNC start_bunzip(
void *jmpbuf,
bunzip_data **bdp,
int in_fd,
@@ -759,7 +759,7 @@ int FAST_FUNC start_bunzip(
return RETVAL_OK;
}
void FAST_FUNC dealloc_bunzip(bunzip_data *bd)
static void FAST_FUNC dealloc_bunzip(bunzip_data *bd)
{
free(bd->dbuf);
free(bd);
@@ -847,6 +847,36 @@ unpack_bz2_stream(transformer_state_t *xstate)
return i ? i : IF_DESKTOP(total_written) + 0;
}
char* FAST_FUNC
unpack_bz2_data(const char *packed, int packed_len, int unpacked_len)
{
char *outbuf = NULL;
bunzip_data *bd;
int i;
jmp_buf jmpbuf;
/* Setup for I/O error handling via longjmp */
i = setjmp(jmpbuf);
if (i == 0) {
i = start_bunzip(&jmpbuf,
&bd,
/* src_fd: */ -1,
/* inbuf: */ packed,
/* len: */ packed_len
);
}
/* read_bunzip can longjmp and end up here with i != 0
* on read data errors! Not trivial */
if (i == 0) {
/* Cannot use xmalloc: will leak bd in NOFORK case! */
outbuf = malloc_or_warn(unpacked_len);
if (outbuf)
read_bunzip(bd, outbuf, unpacked_len);
}
dealloc_bunzip(bd);
return outbuf;
}
#ifdef TESTING
static char *const bunzip_errors[] = {