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 __weak
  74 void gzwrite_progress_init(u64 expectedsize)
  75 {
  76         putc('\n');
  77 }
  78
  79 __weak
  80 void gzwrite_progress(int iteration,
  81                      u64 bytes_written,
  82                      u64 total_bytes)
  83 {
  84         if (0 == (iteration & 3))
  85                 printf("%llu/%llu\r", bytes_written, total_bytes);
  86 }
  87
  88 __weak
  89 void gzwrite_progress_finish(int returnval,
  90                              u64 bytes_written,
  91                              u64 total_bytes,
  92                              u32 expected_crc,
  93                              u32 calculated_crc)
  94 {
  95         if (0 == returnval) {
  96                 printf("\n\t%llu bytes, crc 0x%08x\n",
  97                        total_bytes, calculated_crc);
  98         } else {
  99                 printf("\n\tuncompressed %llu of %llu\n"
 100                        "\tcrcs == 0x%08x/0x%08x\n",
 101                        bytes_written, total_bytes,
 102                        expected_crc, calculated_crc);
 103         }
 104 }
 105
 106 int gzwrite(unsigned char *src, int len,
 107             struct block_dev_desc *dev,
 108             unsigned long szwritebuf,
 109             u64 startoffs,
 110             u64 szexpected)
 111 {
 112         int i, flags;
 113         z_stream s;
 114         int r = 0;
 115         unsigned char *writebuf;
 116         unsigned crc = 0;
 117         u64 totalfilled = 0;
 118         lbaint_t blksperbuf, outblock;
 119         u32 expected_crc;
 120         u32 payload_size;
 121         int iteration = 0;
 122
 123         if (!szwritebuf ||
 124             (szwritebuf % dev->blksz) ||
 125             (szwritebuf < dev->blksz)) {
 126                 printf("%s: size %lu not a multiple of %lu\n",
 127                        __func__, szwritebuf, dev->blksz);
 128                 return -1;
 129         }
 130
 131         if (startoffs & (dev->blksz-1)) {
 132                 printf("%s: start offset %llu not a multiple of %lu\n",
 133                        __func__, startoffs, dev->blksz);
 134                 return -1;
 135         }
 136
 137         blksperbuf = szwritebuf / dev->blksz;
 138         outblock = lldiv(startoffs, dev->blksz);
 139
 140         /* skip header */
 141         i = 10;
 142         flags = src[3];
 143         if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
 144                 puts("Error: Bad gzipped data\n");
 145                 return -1;
 146         }
 147         if ((flags & EXTRA_FIELD) != 0)
 148                 i = 12 + src[10] + (src[11] << 8);
 149         if ((flags & ORIG_NAME) != 0)
 150                 while (src[i++] != 0)
 151                         ;
 152         if ((flags & COMMENT) != 0)
 153                 while (src[i++] != 0)
 154                         ;
 155         if ((flags & HEAD_CRC) != 0)
 156                 i += 2;
 157
 158         if (i >= len-8) {
 159                 puts("Error: gunzip out of data in header");
 160                 return -1;
 161         }
 162
 163         payload_size = len - i - 8;
 164
 165         memcpy(&expected_crc, src + len - 8, sizeof(expected_crc));
 166         expected_crc = le32_to_cpu(expected_crc);
 167         u32 szuncompressed;
 168         memcpy(&szuncompressed, src + len - 4, sizeof(szuncompressed));
 169         if (szexpected == 0) {
 170                 szexpected = le32_to_cpu(szuncompressed);
 171         } else if (szuncompressed != (u32)szexpected) {
 172                 printf("size of %llx doesn't match trailer low bits %x\n",
 173                        szexpected, szuncompressed);
 174                 return -1;
 175         }
 176         if (lldiv(szexpected, dev->blksz) > (dev->lba - outblock)) {
 177                 printf("%s: uncompressed size %llu exceeds device size\n",
 178                        __func__, szexpected);
 179                 return -1;
 180         }
 181
 182         gzwrite_progress_init(szexpected);
 183
 184         s.zalloc = gzalloc;
 185         s.zfree = gzfree;
 186
 187         r = inflateInit2(&s, -MAX_WBITS);
 188         if (r != Z_OK) {
 189                 printf("Error: inflateInit2() returned %d\n", r);
 190                 return -1;
 191         }
 192
 193         s.next_in = src + i;
 194         s.avail_in = payload_size+8;
 195         writebuf = (unsigned char *)malloc(szwritebuf);
 196
 197         /* decompress until deflate stream ends or end of file */
 198         do {
 199                 if (s.avail_in == 0) {
 200                         printf("%s: weird termination with result %d\n",
 201                                __func__, r);
 202                         break;
 203                 }
 204
 205                 /* run inflate() on input until output buffer not full */
 206                 do {
 207                         unsigned long blocks_written;
 208                         int numfilled;
 209                         lbaint_t writeblocks;
 210
 211                         s.avail_out = szwritebuf;
 212                         s.next_out = writebuf;
 213                         r = inflate(&s, Z_SYNC_FLUSH);
 214                         if ((r != Z_OK) &&
 215                             (r != Z_STREAM_END)) {
 216                                 printf("Error: inflate() returned %d\n", r);
 217                                 goto out;
 218                         }
 219                         numfilled = szwritebuf - s.avail_out;
 220                         crc = crc32(crc, writebuf, numfilled);
 221                         totalfilled += numfilled;
 222                         if (numfilled < szwritebuf) {
 223                                 writeblocks = (numfilled+dev->blksz-1)
 224                                                 / dev->blksz;
 225                                 memset(writebuf+numfilled, 0,
 226                                        dev->blksz-(numfilled%dev->blksz));
 227                         } else {
 228                                 writeblocks = blksperbuf;
 229                         }
 230
 231                         gzwrite_progress(iteration++,
 232                                          totalfilled,
 233                                          szexpected);
 234                         blocks_written = dev->block_write(dev->dev,
 235                                                           outblock,
 236                                                           writeblocks,
 237                                                           writebuf);
 238                         outblock += blocks_written;
 239                         if (ctrlc()) {
 240                                 puts("abort\n");
 241                                 goto out;
 242                         }
 243                         WATCHDOG_RESET();
 244                 } while (s.avail_out == 0);
 245                 /* done when inflate() says it's done */
 246         } while (r != Z_STREAM_END);
 247
 248         if ((szexpected != totalfilled) ||
 249             (crc != expected_crc))
 250                 r = -1;
 251         else
 252                 r = 0;
 253
 254 out:
 255         gzwrite_progress_finish(r, totalfilled, szexpected,
 256                                 expected_crc, crc);
 257         free(writebuf);
 258         inflateEnd(&s);
 259
 260         return r;
 261 }
 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_out == 0 || r != Z_BUF_ERROR)) {
 289                         printf("Error: inflate() returned %d\n", r);
 290                         err = -1;
 291                         break;
 292                 }
 293                 s.avail_in = *lenp - offset - (int)(s.next_out - (unsigned char*)dst);
 294         } while (r == Z_BUF_ERROR);
 295         *lenp = s.next_out - (unsigned char *) dst;
 296         inflateEnd(&s);
 297
 298         return err;
 299 }