lib/gunzip.c

   1 /*
   2  * (C) Copyright 2000-2006
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <watchdog.h>
  10 #include <command.h>
  11 #include <console.h>
  12 #include <image.h>
  13 #include <malloc.h>
  14 #include <u-boot/zlib.h>
  15 #include <div64.h>
  16
  17 #define HEADER0                 '\x1f'
  18 #define HEADER1                 '\x8b'
  19 #define ZALLOC_ALIGNMENT        16
  20 #define HEAD_CRC                2
  21 #define EXTRA_FIELD             4
  22 #define ORIG_NAME               8
  23 #define COMMENT                 0x10
  24 #define RESERVED                0xe0
  25 #define DEFLATED                8
  26
  27 void *gzalloc(void *x, unsigned items, unsigned size)
  28 {
  29         void *p;
  30
  31         size *= items;
  32         size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
  33
  34         p = malloc (size);
  35
  36         return (p);
  37 }
  38
  39 void gzfree(void *x, void *addr, unsigned nb)
  40 {
  41         free (addr);
  42 }
  43
  44 int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp)
  45 {
  46         int i, flags;
  47
  48         /* skip header */
  49         i = 10;
  50         flags = src[3];
  51         if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
  52                 puts ("Error: Bad gzipped data\n");
  53                 return (-1);
  54         }
  55         if ((flags & EXTRA_FIELD) != 0)
  56                 i = 12 + src[10] + (src[11] << 8);
  57         if ((flags & ORIG_NAME) != 0)
  58                 while (src[i++] != 0)
  59                         ;
  60         if ((flags & COMMENT) != 0)
  61                 while (src[i++] != 0)
  62                         ;
  63         if ((flags & HEAD_CRC) != 0)
  64                 i += 2;
  65         if (i >= *lenp) {
  66                 puts ("Error: gunzip out of data in header\n");
  67                 return (-1);
  68         }
  69
  70         return zunzip(dst, dstlen, src, lenp, 1, i);
  71 }
  72
  73 #ifdef CONFIG_CMD_UNZIP
  74 __weak
  75 void gzwrite_progress_init(u64 expectedsize)
  76 {
  77         putc('\n');
  78 }
  79
  80 __weak
  81 void gzwrite_progress(int iteration,
  82                      u64 bytes_written,
  83                      u64 total_bytes)
  84 {
  85         if (0 == (iteration & 3))
  86                 printf("%llu/%llu\r", bytes_written, total_bytes);
  87 }
  88
  89 __weak
  90 void gzwrite_progress_finish(int returnval,
  91                              u64 bytes_written,
  92                              u64 total_bytes,
  93                              u32 expected_crc,
  94                              u32 calculated_crc)
  95 {
  96         if (0 == returnval) {
  97                 printf("\n\t%llu bytes, crc 0x%08x\n",
  98                        total_bytes, calculated_crc);
  99         } else {
 100                 printf("\n\tuncompressed %llu of %llu\n"
 101                        "\tcrcs == 0x%08x/0x%08x\n",
 102                        bytes_written, total_bytes,
 103                        expected_crc, calculated_crc);
 104         }
 105 }
 106
 107 int gzwrite(unsigned char *src, int len,
 108             struct blk_desc *dev,
 109             unsigned long szwritebuf,
 110             u64 startoffs,
 111             u64 szexpected)
 112 {
 113         int i, flags;
 114         z_stream s;
 115         int r = 0;
 116         unsigned char *writebuf;
 117         unsigned crc = 0;
 118         u64 totalfilled = 0;
 119         lbaint_t blksperbuf, outblock;
 120         u32 expected_crc;
 121         u32 payload_size;
 122         int iteration = 0;
 123
 124         if (!szwritebuf ||
 125             (szwritebuf % dev->blksz) ||
 126             (szwritebuf < dev->blksz)) {
 127                 printf("%s: size %lu not a multiple of %lu\n",
 128                        __func__, szwritebuf, dev->blksz);
 129                 return -1;
 130         }
 131
 132         if (startoffs & (dev->blksz-1)) {
 133                 printf("%s: start offset %llu not a multiple of %lu\n",
 134                        __func__, startoffs, dev->blksz);
 135                 return -1;
 136         }
 137
 138         blksperbuf = szwritebuf / dev->blksz;
 139         outblock = lldiv(startoffs, dev->blksz);
 140
 141         /* skip header */
 142         i = 10;
 143         flags = src[3];
 144         if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
 145                 puts("Error: Bad gzipped data\n");
 146                 return -1;
 147         }
 148         if ((flags & EXTRA_FIELD) != 0)
 149                 i = 12 + src[10] + (src[11] << 8);
 150         if ((flags & ORIG_NAME) != 0)
 151                 while (src[i++] != 0)
 152                         ;
 153         if ((flags & COMMENT) != 0)
 154                 while (src[i++] != 0)
 155                         ;
 156         if ((flags & HEAD_CRC) != 0)
 157                 i += 2;
 158
 159         if (i >= len-8) {
 160                 puts("Error: gunzip out of data in header");
 161                 return -1;
 162         }
 163
 164         payload_size = len - i - 8;
 165
 166         memcpy(&expected_crc, src + len - 8, sizeof(expected_crc));
 167         expected_crc = le32_to_cpu(expected_crc);
 168         u32 szuncompressed;
 169         memcpy(&szuncompressed, src + len - 4, sizeof(szuncompressed));
 170         if (szexpected == 0) {
 171                 szexpected = le32_to_cpu(szuncompressed);
 172         } else if (szuncompressed != (u32)szexpected) {
 173                 printf("size of %llx doesn't match trailer low bits %x\n",
 174                        szexpected, szuncompressed);
 175                 return -1;
 176         }
 177         if (lldiv(szexpected, dev->blksz) > (dev->lba - outblock)) {
 178                 printf("%s: uncompressed size %llu exceeds device size\n",
 179                        __func__, szexpected);
 180                 return -1;
 181         }
 182
 183         gzwrite_progress_init(szexpected);
 184
 185         s.zalloc = gzalloc;
 186         s.zfree = gzfree;
 187
 188         r = inflateInit2(&s, -MAX_WBITS);
 189         if (r != Z_OK) {
 190                 printf("Error: inflateInit2() returned %d\n", r);
 191                 return -1;
 192         }
 193
 194         s.next_in = src + i;
 195         s.avail_in = payload_size+8;
 196         writebuf = (unsigned char *)malloc(szwritebuf);
 197
 198         /* decompress until deflate stream ends or end of file */
 199         do {
 200                 if (s.avail_in == 0) {
 201                         printf("%s: weird termination with result %d\n",
 202                                __func__, r);
 203                         break;
 204                 }
 205
 206                 /* run inflate() on input until output buffer not full */
 207                 do {
 208                         unsigned long blocks_written;
 209                         int numfilled;
 210                         lbaint_t writeblocks;
 211
 212                         s.avail_out = szwritebuf;
 213                         s.next_out = writebuf;
 214                         r = inflate(&s, Z_SYNC_FLUSH);
 215                         if ((r != Z_OK) &&
 216                             (r != Z_STREAM_END)) {
 217                                 printf("Error: inflate() returned %d\n", r);
 218                                 goto out;
 219                         }
 220                         numfilled = szwritebuf - s.avail_out;
 221                         crc = crc32(crc, writebuf, numfilled);
 222                         totalfilled += numfilled;
 223                         if (numfilled < szwritebuf) {
 224                                 writeblocks = (numfilled+dev->blksz-1)
 225                                                 / dev->blksz;
 226                                 memset(writebuf+numfilled, 0,
 227                                        dev->blksz-(numfilled%dev->blksz));
 228                         } else {
 229                                 writeblocks = blksperbuf;
 230                         }
 231
 232                         gzwrite_progress(iteration++,
 233                                          totalfilled,
 234                                          szexpected);
 235                         blocks_written = blk_dwrite(dev, outblock,
 236                                                     writeblocks, writebuf);
 237                         outblock += blocks_written;
 238                         if (ctrlc()) {
 239                                 puts("abort\n");
 240                                 goto out;
 241                         }
 242                         WATCHDOG_RESET();
 243                 } while (s.avail_out == 0);
 244                 /* done when inflate() says it's done */
 245         } while (r != Z_STREAM_END);
 246
 247         if ((szexpected != totalfilled) ||
 248             (crc != expected_crc))
 249                 r = -1;
 250         else
 251                 r = 0;
 252
 253 out:
 254         gzwrite_progress_finish(r, totalfilled, szexpected,
 255                                 expected_crc, crc);
 256         free(writebuf);
 257         inflateEnd(&s);
 258
 259         return r;
 260 }
 261 #endif
 262
 263 /*
 264  * Uncompress blocks compressed with zlib without headers
 265  */
 266 int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp,
 267                                                 int stoponerr, int offset)
 268 {
 269         z_stream s;
 270         int err = 0;
 271         int r;
 272
 273         s.zalloc = gzalloc;
 274         s.zfree = gzfree;
 275
 276         r = inflateInit2(&s, -MAX_WBITS);
 277         if (r != Z_OK) {
 278                 printf("Error: inflateInit2() returned %d\n", r);
 279                 return -1;
 280         }
 281         s.next_in = src + offset;
 282         s.avail_in = *lenp - offset;
 283         s.next_out = dst;
 284         s.avail_out = dstlen;
 285         do {
 286                 r = inflate(&s, Z_FINISH);
 287                 if (stoponerr == 1 && r != Z_STREAM_END &&
 288                     (s.avail_in == 0 || s.avail_out == 0 || r != Z_BUF_ERROR)) {
 289                         printf("Error: inflate() returned %d\n", r);
 290                         err = -1;
 291                         break;
 292                 }
 293         } while (r == Z_BUF_ERROR);
 294         *lenp = s.next_out - (unsigned char *) dst;
 295         inflateEnd(&s);
 296
 297         return err;
 298 }