* m: maximum lookup bits, returns actual
*/
static int huft_build(const unsigned *b, const unsigned n,
- const unsigned s, const unsigned short *d,
- const unsigned char *e, huft_t **t, unsigned *m)
+ const unsigned s, const unsigned short *d,
+ const unsigned char *e, huft_t **t, unsigned *m)
{
unsigned a; /* counter for codes of length k */
unsigned c[BMAX + 1]; /* bit length count table */
unsigned i; /* counter, current code */
unsigned j; /* counter */
int k; /* number of bits in current code */
- unsigned *p; /* pointer into c[], b[], or v[] */
+ const unsigned *p; /* pointer into c[], b[], or v[] */
huft_t *q; /* points to current table */
huft_t r; /* table entry for structure assignment */
huft_t *u[BMAX]; /* table stack */
- unsigned v[N_MAX]; /* values in order of bit length */
+ unsigned v[N_MAX + 1]; /* values in order of bit length. last v[] is never used */
int ws[BMAX + 1]; /* bits decoded stack */
int w; /* bits decoded */
unsigned x[BMAX + 1]; /* bit offsets, then code stack */
/* Generate counts for each bit length */
memset(c, 0, sizeof(c));
- p = (unsigned *) b; /* cast allows us to reuse p for pointing to b */
+ p = b;
i = n;
do {
c[*p]++; /* assume all entries <= BMAX */
}
/* Find minimum and maximum length, bound *m by those */
- for (j = 1; (c[j] == 0) && (j <= BMAX); j++)
+ for (j = 1; (j <= BMAX) && (c[j] == 0); j++)
continue;
k = j; /* minimum code length */
for (i = BMAX; (c[i] == 0) && i; i--)
*xp++ = j;
}
- /* Make a table of values in order of bit lengths */
- p = (unsigned *) b;
+ /* Make a table of values in order of bit lengths.
+ * To detect bad input, unused v[i]'s are set to invalid value UINT_MAX.
+ * In particular, last v[i] is never filled and must not be accessed.
+ */
+ memset(v, 0xff, sizeof(v));
+ p = b;
i = 0;
do {
j = *p++;
/* set up table entry in r */
r.b = (unsigned char) (k - w);
- if (p >= v + n) {
+ if (/*p >= v + n || -- redundant, caught by the second check: */
+ *p == UINT_MAX /* do we access uninited v[i]? (see memset(v))*/
+ ) {
r.e = 99; /* out of values--invalid code */
} else if (*p < s) {
r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is EOB code */
e = t->e;
if (e > 16)
do {
- if (e == 99)
- abort_unzip(PASS_STATE_ONLY);;
+ if (e == 99) {
+ abort_unzip(PASS_STATE_ONLY);
+ }
bb >>= t->b;
k -= t->b;
e -= 16;
e = t->e;
if (e > 16)
do {
- if (e == 99)
+ if (e == 99) {
abort_unzip(PASS_STATE_ONLY);
+ }
bb >>= t->b;
k -= t->b;
e -= 16;
b_dynamic >>= 4;
k_dynamic -= 4;
- if (nl > 286 || nd > 30)
+ if (nl > 286 || nd > 30) {
abort_unzip(PASS_STATE_ONLY); /* bad lengths */
+ }
/* read in bit-length-code lengths */
for (j = 0; j < nb; j++) {
bl = lbits;
i = huft_build(ll, nl, 257, cplens, cplext, &inflate_codes_tl, &bl);
- if (i != 0)
+ if (i != 0) {
abort_unzip(PASS_STATE_ONLY);
+ }
bd = dbits;
i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &inflate_codes_td, &bd);
- if (i != 0)
+ if (i != 0) {
abort_unzip(PASS_STATE_ONLY);
+ }
/* set up data for inflate_codes() */
inflate_codes_setup(PASS_STATE bl, bd);
/* Called from unpack_gz_stream() and inflate_unzip() */
static IF_DESKTOP(long long) int
-inflate_unzip_internal(STATE_PARAM int in, int out)
+inflate_unzip_internal(STATE_PARAM transformer_state_t *xstate)
{
IF_DESKTOP(long long) int n = 0;
ssize_t nwrote;
gunzip_window = xmalloc(GUNZIP_WSIZE);
gunzip_outbuf_count = 0;
gunzip_bytes_out = 0;
- gunzip_src_fd = in;
+ gunzip_src_fd = xstate->src_fd;
/* (re) initialize state */
method = -1;
error_msg = "corrupted data";
if (setjmp(error_jmp)) {
/* Error from deep inside zip machinery */
+ bb_error_msg(error_msg);
n = -1;
goto ret;
}
while (1) {
int r = inflate_get_next_window(PASS_STATE_ONLY);
- nwrote = full_write(out, gunzip_window, gunzip_outbuf_count);
- if (nwrote != (ssize_t)gunzip_outbuf_count) {
- bb_perror_msg("write");
+ nwrote = transformer_write(xstate, gunzip_window, gunzip_outbuf_count);
+ if (nwrote == (ssize_t)-1) {
n = -1;
goto ret;
}
/* For unzip */
IF_DESKTOP(long long) int FAST_FUNC
-inflate_unzip(transformer_aux_data_t *aux, int in, int out)
+inflate_unzip(transformer_state_t *xstate)
{
IF_DESKTOP(long long) int n;
DECLARE_STATE;
ALLOC_STATE;
- to_read = aux->bytes_in;
+ to_read = xstate->bytes_in;
// bytebuffer_max = 0x8000;
bytebuffer_offset = 4;
bytebuffer = xmalloc(bytebuffer_max);
- n = inflate_unzip_internal(PASS_STATE in, out);
+ n = inflate_unzip_internal(PASS_STATE xstate);
free(bytebuffer);
- aux->crc32 = gunzip_crc;
- aux->bytes_out = gunzip_bytes_out;
+ xstate->crc32 = gunzip_crc;
+ xstate->bytes_out = gunzip_bytes_out;
DEALLOC_STATE;
return n;
}
return res;
}
-static int check_header_gzip(STATE_PARAM transformer_aux_data_t *aux)
+static int check_header_gzip(STATE_PARAM transformer_state_t *xstate)
{
union {
unsigned char raw[8];
uint8_t os_flags_UNUSED;
} PACKED formatted;
} header;
- struct BUG_header {
- char BUG_header[sizeof(header) == 8 ? 1 : -1];
- };
+
+ BUILD_BUG_ON(sizeof(header) != 8);
/*
* Rewind bytebuffer. We use the beginning because the header has 8
}
}
- if (aux)
- aux->mtime = SWAP_LE32(header.formatted.mtime);
+ xstate->mtime = SWAP_LE32(header.formatted.mtime);
/* Read the header checksum */
if (header.formatted.flags & 0x02) {
}
IF_DESKTOP(long long) int FAST_FUNC
-unpack_gz_stream(transformer_aux_data_t *aux, int src_fd, int dst_fd)
+unpack_gz_stream(transformer_state_t *xstate)
{
uint32_t v32;
IF_DESKTOP(long long) int total, n;
DECLARE_STATE;
- if (check_signature16(aux, src_fd, GZIP_MAGIC))
+#if !ENABLE_FEATURE_SEAMLESS_Z
+ if (check_signature16(xstate, GZIP_MAGIC))
return -1;
+#else
+ if (!xstate->signature_skipped) {
+ uint16_t magic2;
+
+ if (full_read(xstate->src_fd, &magic2, 2) != 2) {
+ bad_magic:
+ bb_error_msg("invalid magic");
+ return -1;
+ }
+ if (magic2 == COMPRESS_MAGIC) {
+ xstate->signature_skipped = 2;
+ return unpack_Z_stream(xstate);
+ }
+ if (magic2 != GZIP_MAGIC)
+ goto bad_magic;
+ }
+#endif
total = 0;
to_read = -1;
// bytebuffer_max = 0x8000;
bytebuffer = xmalloc(bytebuffer_max);
- gunzip_src_fd = src_fd;
+ gunzip_src_fd = xstate->src_fd;
again:
- if (!check_header_gzip(PASS_STATE aux)) {
+ if (!check_header_gzip(PASS_STATE xstate)) {
bb_error_msg("corrupted data");
total = -1;
goto ret;
}
- n = inflate_unzip_internal(PASS_STATE src_fd, dst_fd);
+ n = inflate_unzip_internal(PASS_STATE xstate);
if (n < 0) {
total = -1;
goto ret;
projects / oweals / busybox.git / blobdiff