static int zlib_decomp_init(void)
{
struct z_stream_s *stream = &ubifs_zlib_stream;
int ret;
stream->workspace = xzalloc(zlib_inflate_workspacesize());
ret = zlib_inflateInit2(stream, -MAX_WBITS);
if (ret != Z_OK) {
free(stream->workspace);
return -EINVAL;
}
return 0;
}
static void
gzip1_decompress(coa_t coa, __u8 * src_first, size_t src_len,
__u8 * dst_first, size_t *dst_len)
{
int ret = 0;
struct z_stream_s stream;
assert("edward-843", coa != NULL);
assert("edward-876", src_len != 0);
stream.workspace = coa;
ret = zlib_inflateInit2(&stream, -GZIP1_DEF_WINBITS);
if (ret != Z_OK) {
warning("edward-774", "zlib_inflateInit2 returned %d\n", ret);
return;
}
ret = zlib_inflateReset(&stream);
if (ret != Z_OK) {
warning("edward-775", "zlib_inflateReset returned %d\n", ret);
return;
}
stream.next_in = src_first;
stream.avail_in = src_len;
stream.next_out = dst_first;
stream.avail_out = *dst_len;
ret = zlib_inflate(&stream, Z_SYNC_FLUSH);
/*
* Work around a bug in zlib, which sometimes wants to taste an extra
* byte when being used in the (undocumented) raw deflate mode.
* (From USAGI).
*/
if (ret == Z_OK && !stream.avail_in && stream.avail_out) {
u8 zerostuff = 0;
stream.next_in = &zerostuff;
stream.avail_in = 1;
ret = zlib_inflate(&stream, Z_FINISH);
}
if (ret != Z_STREAM_END) {
warning("edward-776", "zlib_inflate returned %d\n", ret);
return;
}
*dst_len = stream.total_out;
return;
}
void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
{
z_stream s;
int r, i, flags;
/* skip header */
i = 10;
flags = src[3];
if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
puts("bad gzipped data\n");
exit();
}
if ((flags & EXTRA_FIELD) != 0)
i = 12 + src[10] + (src[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (src[i++] != 0)
;
if ((flags & COMMENT) != 0)
while (src[i++] != 0)
;
if ((flags & HEAD_CRC) != 0)
i += 2;
if (i >= *lenp) {
puts("gunzip: ran out of data in header\n");
exit();
}
/* Initialize ourself. */
s.workspace = zalloc(zlib_inflate_workspacesize());
r = zlib_inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
puts("zlib_inflateInit2 returned "); puthex(r); puts("\n");
exit();
}
s.next_in = src + i;
s.avail_in = *lenp - i;
s.next_out = dst;
s.avail_out = dstlen;
r = zlib_inflate(&s, Z_FINISH);
if (r != Z_OK && r != Z_STREAM_END) {
puts("inflate returned "); puthex(r); puts("\n");
exit();
}
*lenp = s.next_out - (unsigned char *) dst;
zlib_inflateEnd(&s);
}
void gunzip (void *dst, int dstlen, unsigned char *src, int *lenp)
{
z_stream s;
int r, i, flags;
i = 10;
flags = src[3];
if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
exit();
}
if ((flags & EXTRA_FIELD) != 0)
i = 12 + src[10] + (src[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (src[i++] != 0)
;
if ((flags & COMMENT) != 0)
while (src[i++] != 0)
;
if ((flags & HEAD_CRC) != 0)
i += 2;
if (i >= *lenp) {
exit();
}
s.workspace = zalloc(zlib_inflate_workspacesize());
r = zlib_inflateInit2(&s, -MAX_WBITS);
if (r != Z_OK) {
exit();
}
s.next_in = src + i;
s.avail_in = *lenp - i;
s.next_out = dst;
s.avail_out = dstlen;
r = zlib_inflate(&s, Z_FINISH);
if (r != Z_OK && r != Z_STREAM_END) {
exit();
}
*lenp = s.next_out - (unsigned char *) dst;
zlib_inflateEnd(&s);
}
/* _VMKLNX_CODECHECK_: zlib_inflate_blob */
int zlib_inflate_blob(void *gunzip_buf, unsigned int sz,
const void *buf, unsigned int len)
{
const u8 *zbuf = buf;
struct z_stream_s *strm;
int rc;
#if defined(__VMKLNX__)
VMK_ASSERT(vmk_PreemptionIsEnabled() == VMK_FALSE);
#endif
rc = -ENOMEM;
strm = kmalloc(sizeof(*strm), GFP_KERNEL);
if (strm == NULL)
goto gunzip_nomem1;
strm->workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
if (strm->workspace == NULL)
goto gunzip_nomem2;
/* gzip header (1f,8b,08... 10 bytes total + possible asciz filename)
* expected to be stripped from input
*/
strm->next_in = zbuf;
strm->avail_in = len;
strm->next_out = gunzip_buf;
strm->avail_out = sz;
rc = zlib_inflateInit2(strm, -MAX_WBITS);
if (rc == Z_OK) {
rc = zlib_inflate(strm, Z_FINISH);
/* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
if (rc == Z_STREAM_END)
rc = sz - strm->avail_out;
else
rc = -EINVAL;
zlib_inflateEnd(strm);
} else
rc = -EINVAL;
kfree(strm->workspace);
gunzip_nomem2:
kfree(strm);
gunzip_nomem1:
return rc; /* returns Z_OK (0) if successful */
}
void gunzip_start(struct gunzip_state *state, void *src, int srclen)
{
char *hdr = src;
int hdrlen = 0;
memset(state, 0, sizeof(*state));
/* Check for gzip magic number */
if ((hdr[0] == 0x1f) && (hdr[1] == 0x8b)) {
/* gzip data, initialize zlib parameters */
int r, flags;
state->s.workspace = state->scratch;
if (zlib_inflate_workspacesize() > sizeof(state->scratch))
fatal("insufficient scratch space for gunzip\n\r");
/* skip header */
hdrlen = 10;
flags = hdr[3];
if (hdr[2] != Z_DEFLATED || (flags & RESERVED) != 0)
fatal("bad gzipped data\n\r");
if ((flags & EXTRA_FIELD) != 0)
hdrlen = 12 + hdr[10] + (hdr[11] << 8);
if ((flags & ORIG_NAME) != 0)
while (hdr[hdrlen++] != 0)
;
if ((flags & COMMENT) != 0)
while (hdr[hdrlen++] != 0)
;
if ((flags & HEAD_CRC) != 0)
hdrlen += 2;
if (hdrlen >= srclen)
fatal("gunzip_start: ran out of data in header\n\r");
r = zlib_inflateInit2(&state->s, -MAX_WBITS);
if (r != Z_OK)
fatal("inflateInit2 returned %d\n\r", r);
}
state->s.total_in = hdrlen;
state->s.next_in = src + hdrlen;
state->s.avail_in = srclen - hdrlen;
}
/* Utility function: initialize zlib, unpack binary blob, clean up zlib,
* return len or negative error code.
*/
int zlib_inflate_blob(void *gunzip_buf, unsigned int sz,
const void *buf, unsigned int len)
{
const u8 *zbuf = buf;
struct z_stream_s *strm;
int rc;
rc = -ENOMEM;
strm = MALLOC(sizeof(*strm));
if (strm == NULL)
goto gunzip_nomem1;
strm->workspace = MALLOC(zlib_inflate_workspacesize());
if (strm->workspace == NULL)
goto gunzip_nomem2;
/* gzip header (1f,8b,08... 10 bytes total + possible asciz filename)
* expected to be stripped from input
*/
strm->next_in = zbuf;
strm->avail_in = len;
strm->next_out = gunzip_buf;
strm->avail_out = sz;
rc = zlib_inflateInit2(strm, -MAX_WBITS);
if (rc == Z_OK) {
rc = zlib_inflate(strm, Z_FINISH);
/* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
if (rc == Z_STREAM_END)
rc = sz - strm->avail_out;
else
rc = -EINVAL;
zlib_inflateEnd(strm);
} else
rc = -EINVAL;
FREE(strm->workspace);
gunzip_nomem2:
FREE(strm);
gunzip_nomem1:
return rc; /* returns Z_OK (0) if successful */
}
static int deflate_decomp_init(struct deflate_ctx *ctx)
{
int ret = 0;
struct z_stream_s *stream = &ctx->decomp_stream;
stream->workspace = kzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
if (!stream->workspace ) {
ret = -ENOMEM;
goto out;
}
ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
if (ret != Z_OK) {
ret = -EINVAL;
goto out_free;
}
out:
return ret;
out_free:
kfree(stream->workspace);
goto out;
}
/**
* z_decomp_alloc - allocate space for a decompressor.
* @options: pointer to CCP option data
* @opt_len: length of the CCP option at @options.
*
* The @options pointer points to the a buffer containing the
* CCP option data for the compression being negotiated. It is
* formatted according to RFC1979, and describes the window
* size that we are requesting the peer to use in compressing
* data to be sent to us.
*
* Returns the pointer to the private state for the decompressor,
* or NULL if we could not allocate enough memory.
*/
static void *z_decomp_alloc(unsigned char *options, int opt_len)
{
struct ppp_deflate_state *state;
int w_size;
if (opt_len != CILEN_DEFLATE ||
(options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT) ||
options[1] != CILEN_DEFLATE ||
DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL ||
options[3] != DEFLATE_CHK_SEQUENCE)
return NULL;
w_size = DEFLATE_SIZE(options[2]);
if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
return NULL;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (state == NULL)
return NULL;
state->w_size = w_size;
state->strm.next_out = NULL;
/* LGE_CHANGE_S [LS855:[email protected]] 2011-07-11, */
#if 0 /* Delete Warning Log - OMAPS00243976 */
state->strm.workspace = kmalloc(zlib_inflate_workspacesize(),
GFP_KERNEL|__GFP_REPEAT);
#else
state->strm.workspace = vmalloc(zlib_inflate_workspacesize());
#endif
/* LGE_CHANGE_E [LS855:[email protected]] 2011-07-11 */
if (state->strm.workspace == NULL)
goto out_free;
if (zlib_inflateInit2(&state->strm, -w_size) != Z_OK)
goto out_free;
return (void *) state;
out_free:
z_decomp_free(state);
return NULL;
}
static int deflate_decomp_init(struct deflate_ctx *ctx, int format)
{
int ret = 0;
struct z_stream_s *stream = &ctx->decomp_stream;
stream->workspace = vzalloc(zlib_inflate_workspacesize());
if (!stream->workspace) {
ret = -ENOMEM;
goto out;
}
if (format)
ret = zlib_inflateInit(stream);
else
ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
if (ret != Z_OK) {
ret = -EINVAL;
goto out_free;
}
out:
return ret;
out_free:
vfree(stream->workspace);
goto out;
}
/* Included from initramfs et al code */
STATIC int INIT __gunzip(unsigned char *buf, long len,
long (*fill)(void*, unsigned long),
long (*flush)(void*, unsigned long),
unsigned char *out_buf, long out_len,
long *pos,
void(*error)(char *x)) {
u8 *zbuf;
struct z_stream_s *strm;
int rc;
rc = -1;
if (flush) {
out_len = 0x8000; /* 32 K */
out_buf = malloc(out_len);
} else {
if (!out_len)
out_len = ((size_t)~0) - (size_t)out_buf; /* no limit */
}
if (!out_buf) {
error("Out of memory while allocating output buffer");
goto gunzip_nomem1;
}
if (buf)
zbuf = buf;
else {
zbuf = malloc(GZIP_IOBUF_SIZE);
len = 0;
}
if (!zbuf) {
error("Out of memory while allocating input buffer");
goto gunzip_nomem2;
}
strm = malloc(sizeof(*strm));
if (strm == NULL) {
error("Out of memory while allocating z_stream");
goto gunzip_nomem3;
}
strm->workspace = malloc(flush ? zlib_inflate_workspacesize() :
sizeof(struct inflate_state));
if (strm->workspace == NULL) {
error("Out of memory while allocating workspace");
goto gunzip_nomem4;
}
if (!fill)
fill = nofill;
if (len == 0)
len = fill(zbuf, GZIP_IOBUF_SIZE);
/* verify the gzip header */
if (len < 10 ||
zbuf[0] != 0x1f || zbuf[1] != 0x8b || zbuf[2] != 0x08) {
if (pos)
*pos = 0;
error("Not a gzip file");
goto gunzip_5;
}
/* skip over gzip header (1f,8b,08... 10 bytes total +
* possible asciz filename)
*/
strm->next_in = zbuf + 10;
strm->avail_in = len - 10;
/* skip over asciz filename */
if (zbuf[3] & 0x8) {
do {
/*
* If the filename doesn't fit into the buffer,
* the file is very probably corrupt. Don't try
* to read more data.
*/
if (strm->avail_in == 0) {
error("header error");
goto gunzip_5;
}
--strm->avail_in;
} while (*strm->next_in++);
}
strm->next_out = out_buf;
strm->avail_out = out_len;
rc = zlib_inflateInit2(strm, -MAX_WBITS);
if (!flush) {
WS(strm)->inflate_state.wsize = 0;
WS(strm)->inflate_state.window = NULL;
}
while (rc == Z_OK) {
if (strm->avail_in == 0) {
/* TODO: handle case where both pos and fill are set */
len = fill(zbuf, GZIP_IOBUF_SIZE);
if (len < 0) {
rc = -1;
error("read error");
break;
}
strm->next_in = zbuf;
strm->avail_in = len;
}
rc = zlib_inflate(strm, 0);
/* Write any data generated */
if (flush && strm->next_out > out_buf) {
long l = strm->next_out - out_buf;
if (l != flush(out_buf, l)) {
rc = -1;
error("write error");
break;
}
strm->next_out = out_buf;
strm->avail_out = out_len;
}
/* after Z_FINISH, only Z_STREAM_END is "we unpacked it all" */
if (rc == Z_STREAM_END) {
rc = 0;
break;
} else if (rc != Z_OK) {
error("uncompression error");
rc = -1;
}
}
zlib_inflateEnd(strm);
if (pos)
/* add + 8 to skip over trailer */
*pos = strm->next_in - zbuf+8;
gunzip_5:
free(strm->workspace);
gunzip_nomem4:
free(strm);
gunzip_nomem3:
if (!buf)
free(zbuf);
gunzip_nomem2:
if (flush)
free(out_buf);
gunzip_nomem1:
return rc; /* returns Z_OK (0) if successful */
}
int inflate_read(LPBYTE pbySrcBuffer, LONG lSrcBuffSize, LPBYTE *ppbyDstBuffer, LONG *plDstBuffSize, BOOL bGZip)
{
# define CHUNK 4096
int nRet = Z_DATA_ERROR;
LONG lReadSize = 0;
BYTE pbyBufferTmp[CHUNK];
LONG lTotalSize = 0;
LPBYTE pbyDstBuffer = NULL;
z_stream strm;
strm.zalloc = Z_NULL;
strm.zfree = Z_NULL;
strm.opaque = Z_NULL;
strm.avail_in = 0;
strm.next_in = Z_NULL;
if (bGZip)
nRet = zlib_inflateInit2(&strm, 47);
else
nRet = zlib_inflateInit(&strm);
if (nRet != Z_OK)
return nRet;
strm.avail_in = lSrcBuffSize;
strm.next_in = pbySrcBuffer;
do
{
strm.avail_out = CHUNK;
strm.next_out = pbyBufferTmp;
nRet = zlib_inflate(&strm, Z_NO_FLUSH);
switch (nRet)
{
case Z_NEED_DICT:
nRet = Z_DATA_ERROR;
case Z_DATA_ERROR:
case Z_MEM_ERROR:
goto Exit0;
}
lReadSize = CHUNK - strm.avail_out;
lTotalSize += lReadSize;
pbyDstBuffer = (LPBYTE)realloc(pbyDstBuffer, lTotalSize);
memcpy(pbyDstBuffer + lTotalSize - lReadSize, pbyBufferTmp, lReadSize);
}
while (strm.avail_out == 0);
Exit0:
zlib_inflateEnd(&strm);
if (Z_STREAM_END == nRet)
{
*ppbyDstBuffer = pbyDstBuffer;
*plDstBuffSize = lTotalSize;
}
else
{
if (pbyDstBuffer)
{
free(pbyDstBuffer);
pbyDstBuffer = NULL;
}
*ppbyDstBuffer = NULL;
*plDstBuffSize = 0;
}
return (Z_STREAM_END == nRet) ? Z_OK : Z_DATA_ERROR;
}
