decompress_bunzip2: handle concatenated .bz2 files
function old new delta unpack_bz2_stream 207 307 +100 start_bunzip 199 209 +10 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 110/0) Total: 110 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
8410ac1a07
commit
caddfc8339
@ -44,7 +44,7 @@
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#define RETVAL_LAST_BLOCK (-1)
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#define RETVAL_NOT_BZIP_DATA (-2)
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#define RETVAL_UNEXPECTED_INPUT_EOF (-3)
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#define RETVAL_SHORT_WRITE (-4)
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//#define RETVAL_SHORT_WRITE (-4)
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#define RETVAL_DATA_ERROR (-5)
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#define RETVAL_OUT_OF_MEMORY (-6)
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#define RETVAL_OBSOLETE_INPUT (-7)
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@ -584,8 +584,8 @@ int FAST_FUNC read_bunzip(bunzip_data *bd, char *outbuf, int len)
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/* Because bunzip2 is used for help text unpacking, and because bb_show_usage()
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should work for NOFORK applets too, we must be extremely careful to not leak
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any allocations! */
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int FAST_FUNC start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *inbuf,
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int len)
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int FAST_FUNC start_bunzip(bunzip_data **bdp, int in_fd,
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const void *inbuf, int len)
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{
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bunzip_data *bd;
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unsigned i;
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@ -606,9 +606,11 @@ int FAST_FUNC start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *in
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if (-1 == in_fd) {
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/* in this case, bd->inbuf is read-only */
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bd->inbuf = (void*)inbuf; /* cast away const-ness */
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bd->inbufCount = len;
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} else
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} else {
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bd->inbuf = (unsigned char *)(bd + 1);
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memcpy(bd->inbuf, inbuf, len);
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}
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bd->inbufCount = len;
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/* Init the CRC32 table (big endian) */
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crc32_filltable(bd->crc32Table, 1);
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@ -652,37 +654,59 @@ IF_DESKTOP(long long) int FAST_FUNC
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unpack_bz2_stream(int src_fd, int dst_fd)
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{
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IF_DESKTOP(long long total_written = 0;)
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bunzip_data *bd;
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char *outbuf;
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bunzip_data *bd;
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int i;
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unsigned len;
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outbuf = xmalloc(IOBUF_SIZE);
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i = start_bunzip(&bd, src_fd, NULL, 0);
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if (!i) {
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for (;;) {
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i = read_bunzip(bd, outbuf, IOBUF_SIZE);
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if (i <= 0) break;
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if (i != full_write(dst_fd, outbuf, i)) {
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i = RETVAL_SHORT_WRITE;
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break;
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len = 0;
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while (1) { /* "Process one BZ... stream" loop */
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i = start_bunzip(&bd, src_fd, outbuf + 2, len);
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if (i == 0) {
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while (1) { /* "Produce some output bytes" loop */
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i = read_bunzip(bd, outbuf, IOBUF_SIZE);
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if (i <= 0)
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break;
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if (i != full_write(dst_fd, outbuf, i)) {
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bb_error_msg("short write");
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goto release_mem;
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}
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IF_DESKTOP(total_written += i;)
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}
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IF_DESKTOP(total_written += i;)
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}
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}
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/* Check CRC and release memory */
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if (i == RETVAL_LAST_BLOCK) {
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if (i != RETVAL_LAST_BLOCK) {
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bb_error_msg("bunzip error %d", i);
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break;
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}
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if (bd->headerCRC != bd->totalCRC) {
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bb_error_msg("CRC error");
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} else {
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i = RETVAL_OK;
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break;
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}
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} else if (i == RETVAL_SHORT_WRITE) {
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bb_error_msg("short write");
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} else {
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bb_error_msg("bunzip error %d", i);
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/* Successfully unpacked one BZ stream */
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i = RETVAL_OK;
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/* Do we have "BZ..." after last processed byte?
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* pbzip2 (parallelized bzip2) produces such files.
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*/
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len = bd->inbufCount - bd->inbufPos;
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memcpy(outbuf, &bd->inbuf[bd->inbufPos], len);
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if (len < 2) {
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if (safe_read(src_fd, outbuf + len, 2 - len) != 2 - len)
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break;
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len = 2;
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}
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if (*(uint16_t*)outbuf != BZIP2_MAGIC) /* "BZ"? */
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break;
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dealloc_bunzip(bd);
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len -= 2;
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}
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release_mem:
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dealloc_bunzip(bd);
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free(outbuf);
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@ -193,7 +193,7 @@ extern const llist_t *find_list_entry2(const llist_t *list, const char *filename
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/* A bit of bunzip2 internals are exposed for compressed help support: */
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typedef struct bunzip_data bunzip_data;
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int start_bunzip(bunzip_data **bdp, int in_fd, const unsigned char *inbuf, int len) FAST_FUNC;
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int start_bunzip(bunzip_data **bdp, int in_fd, const void *inbuf, int len) FAST_FUNC;
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int read_bunzip(bunzip_data *bd, char *outbuf, int len) FAST_FUNC;
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void dealloc_bunzip(bunzip_data *bd) FAST_FUNC;
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@ -75,7 +75,7 @@ static const char *unpack_usage_messages(void)
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i = start_bunzip(&bd,
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/* src_fd: */ -1,
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/* inbuf: */ (void *)packed_usage,
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/* inbuf: */ packed_usage,
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/* len: */ sizeof(packed_usage));
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/* read_bunzip can longjmp to start_bunzip, and ultimately
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* end up here with i != 0 on read data errors! Not trivial */
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@ -15,7 +15,7 @@ int bbconfig_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
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bunzip_data *bd;
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int i = start_bunzip(&bd,
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/* src_fd: */ -1,
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/* inbuf: */ (void *)bbconfig_config_bz2,
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/* inbuf: */ bbconfig_config_bz2,
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/* len: */ sizeof(bbconfig_config_bz2));
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/* read_bunzip can longjmp to start_bunzip, and ultimately
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* end up here with i != 0 on read data errors! Not trivial */
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@ -463,6 +463,24 @@ $ECHO -ne "\x40\xa0\x00\x8b\x12\xe8\xfb\xb7\x27\xaa\xd3\x36\x0c\xfc\xe1\x40"
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$ECHO -ne "\x01\xff\x8b\xb9\x22\x9c\x28\x48\x5f\xa5\xca\xf3\x80"
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}
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pbzip_4m_zeros() {
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$ECHO -ne "\x42\x5a\x68\x31\x31\x41\x59\x26\x53\x59\x63\xe3\xec\xa2\x00\x06"
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$ECHO -ne "\xe4\xc1\x00\xc0\x00\x02\x00\x00\x08\x20\x00\x30\xcc\x09\xaa\x69"
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$ECHO -ne "\x94\xa1\x36\xa9\x28\x4f\x17\x72\x45\x38\x50\x90\x63\xe3\xec\xa2"
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$ECHO -ne "\x42\x5a\x68\x31\x31\x41\x59\x26\x53\x59\x63\xe3\xec\xa2\x00\x06"
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$ECHO -ne "\xe4\xc1\x00\xc0\x00\x02\x00\x00\x08\x20\x00\x30\xcc\x09\xaa\x69"
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$ECHO -ne "\x94\xa1\x36\xa9\x28\x4f\x17\x72\x45\x38\x50\x90\x63\xe3\xec\xa2"
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$ECHO -ne "\x42\x5a\x68\x31\x31\x41\x59\x26\x53\x59\x63\xe3\xec\xa2\x00\x06"
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$ECHO -ne "\xe4\xc1\x00\xc0\x00\x02\x00\x00\x08\x20\x00\x30\xcc\x09\xaa\x69"
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$ECHO -ne "\x94\xa1\x36\xa9\x28\x4f\x17\x72\x45\x38\x50\x90\x63\xe3\xec\xa2"
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$ECHO -ne "\x42\x5a\x68\x31\x31\x41\x59\x26\x53\x59\x63\xe3\xec\xa2\x00\x06"
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$ECHO -ne "\xe4\xc1\x00\xc0\x00\x02\x00\x00\x08\x20\x00\x30\xcc\x09\xaa\x69"
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$ECHO -ne "\x94\xa1\x36\xa9\x28\x4f\x17\x72\x45\x38\x50\x90\x63\xe3\xec\xa2"
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$ECHO -ne "\x42\x5a\x68\x31\x31\x41\x59\x26\x53\x59\xc9\xb5\x21\xef\x00\x04"
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$ECHO -ne "\x8d\x40\x20\xc0\x00\x01\x00\x00\x08\x20\x00\x30\xcc\x05\x29\xa6"
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$ECHO -ne "\x4a\x11\xb1\x4a\x11\xe2\xee\x48\xa7\x0a\x12\x19\x36\xa4\x3d\xe0"
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}
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prep() {
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rm -f t*
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hello_$ext >t1.$ext
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@ -520,9 +538,18 @@ if test "${0##*/}" = "bunzip2.tests"; then
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if test1_bz2 | ${bb}bunzip2 >/dev/null \
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&& test "`test1_bz2 | ${bb}bunzip2 | md5sum`" = "61bbeee4be9c6f110a71447f584fda7b -"
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then
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echo "PASS: $unpack: test bz2 file"
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echo "PASS: $unpack: test_bz2 file"
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else
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echo "FAIL: $unpack: test bz2 file"
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echo "FAIL: $unpack: test_bz2 file"
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FAILCOUNT=$((FAILCOUNT + 1))
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fi
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if pbzip_4m_zeros | ${bb}bunzip2 >/dev/null \
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&& test "`pbzip_4m_zeros | ${bb}bunzip2 | md5sum`" = "b5cfa9d6c8febd618f91ac2843d50a1c -"
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then
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echo "PASS: $unpack: pbzip_4m_zeros file"
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else
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echo "FAIL: $unpack: pbzip_4m_zeros file"
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FAILCOUNT=$((FAILCOUNT + 1))
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fi
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fi
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