fs/erofs/decompress.c

23 static int z_erofs_decompress_deflate(struct z_erofs_decompress_req *rq)
25 	u8 *dest = (u8 *)rq->out;
26 	u8 *src = (u8 *)rq->in;
36 	if (inputmargin >= rq->inputsize)
39 	if (rq->decodedskip) {
40 		buff = malloc(rq->decodedlength);
59 	strm.avail_in = rq->inputsize - inputmargin;
61 	strm.avail_out = rq->decodedlength;
63 	ret = inflate(&strm, rq->partial_decoding ? Z_SYNC_FLUSH : Z_FINISH);
64 	if (ret != Z_STREAM_END || strm.total_out != rq->decodedlength) {
65 		if (ret != Z_OK || !rq->partial_decoding) {
71 	if (rq->decodedskip)
72 		memcpy(rq->out, dest + rq->decodedskip,
73 		       rq->decodedlength - rq->decodedskip);
85 static int z_erofs_decompress_lz4(struct z_erofs_decompress_req *rq)
88 	char *dest = rq->out;
89 	char *src = rq->in;
101 		if (inputmargin >= rq->inputsize)
105 	if (rq->decodedskip) {
106 		buff = malloc(rq->decodedlength);
112 	if (rq->partial_decoding || !support_0padding)
114 						  rq->inputsize - inputmargin,
115 						  rq->decodedlength, rq->decodedlength);
118 					  rq->inputsize - inputmargin,
119 					  rq->decodedlength);
121 	if (ret != (int)rq->decodedlength) {
123 			  rq->partial_decoding ? "partial" : "full",
124 			  ret, rq->inputsize, inputmargin, rq->decodedlength);
129 	if (rq->decodedskip)
130 		memcpy(rq->out, dest + rq->decodedskip,
131 		       rq->decodedlength - rq->decodedskip);
141 int z_erofs_decompress(struct z_erofs_decompress_req *rq)
143 	if (rq->alg == Z_EROFS_COMPRESSION_INTERLACED) {
147 		if (rq->inputsize > erofs_blksiz())
150 		if (rq->decodedlength > erofs_blksiz())
153 		if (rq->decodedlength < rq->decodedskip)
156 		count = rq->decodedlength - rq->decodedskip;
157 		skip = erofs_blkoff(rq->interlaced_offset + rq->decodedskip);
159 		memcpy(rq->out, rq->in + skip, rightpart);
160 		memcpy(rq->out + rightpart, rq->in, count - rightpart);
162 	} else if (rq->alg == Z_EROFS_COMPRESSION_SHIFTED) {
163 		if (rq->decodedlength > rq->inputsize)
166 		DBG_BUGON(rq->decodedlength < rq->decodedskip);
167 		memcpy(rq->out, rq->in + rq->decodedskip,
168 		       rq->decodedlength - rq->decodedskip);
173 	if (rq->alg == Z_EROFS_COMPRESSION_LZ4)
174 		return z_erofs_decompress_lz4(rq);
177 	if (rq->alg == Z_EROFS_COMPRESSION_DEFLATE)
178 		return z_erofs_decompress_deflate(rq);