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lib/gunzip.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * (C) Copyright 2000-2006 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
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*/ #include <common.h> |
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#include <command.h> |
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#include <console.h> |
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#include <div64.h> #include <gzip.h> |
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#include <image.h> #include <malloc.h> |
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#include <memalign.h> |
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#include <u-boot/crc.h> |
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#include <watchdog.h> |
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#include <u-boot/zlib.h> |
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#define HEADER0 '\x1f' #define HEADER1 '\x8b' |
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#define ZALLOC_ALIGNMENT 16 #define HEAD_CRC 2 #define EXTRA_FIELD 4 #define ORIG_NAME 8 #define COMMENT 0x10 #define RESERVED 0xe0 #define DEFLATED 8 |
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void *gzalloc(void *x, unsigned items, unsigned size) |
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{ void *p; size *= items; size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1); p = malloc (size); return (p); } |
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void gzfree(void *x, void *addr, unsigned nb) |
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{ free (addr); } |
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int gzip_parse_header(const unsigned char *src, unsigned long len) |
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{ |
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int i, flags; |
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/* skip header */ i = 10; flags = src[3]; if (src[2] != DEFLATED || (flags & RESERVED) != 0) { puts ("Error: Bad gzipped data "); return (-1); } 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; |
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if (i >= len) { |
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puts ("Error: gunzip out of data in header "); return (-1); } |
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return i; } int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp) { int offset = gzip_parse_header(src, *lenp); if (offset < 0) return offset; |
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return zunzip(dst, dstlen, src, lenp, 1, offset); |
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} |
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#ifdef CONFIG_CMD_UNZIP |
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__weak void gzwrite_progress_init(u64 expectedsize) { putc(' '); } __weak void gzwrite_progress(int iteration, u64 bytes_written, u64 total_bytes) { if (0 == (iteration & 3)) printf("%llu/%llu\r", bytes_written, total_bytes); } __weak void gzwrite_progress_finish(int returnval, u64 bytes_written, u64 total_bytes, u32 expected_crc, u32 calculated_crc) { if (0 == returnval) { printf(" \t%llu bytes, crc 0x%08x ", total_bytes, calculated_crc); } else { printf(" \tuncompressed %llu of %llu " "\tcrcs == 0x%08x/0x%08x ", bytes_written, total_bytes, expected_crc, calculated_crc); } } int gzwrite(unsigned char *src, int len, |
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struct blk_desc *dev, |
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unsigned long szwritebuf, u64 startoffs, u64 szexpected) { int i, flags; z_stream s; int r = 0; unsigned char *writebuf; unsigned crc = 0; u64 totalfilled = 0; lbaint_t blksperbuf, outblock; u32 expected_crc; u32 payload_size; int iteration = 0; if (!szwritebuf || (szwritebuf % dev->blksz) || (szwritebuf < dev->blksz)) { printf("%s: size %lu not a multiple of %lu ", __func__, szwritebuf, dev->blksz); return -1; } if (startoffs & (dev->blksz-1)) { printf("%s: start offset %llu not a multiple of %lu ", __func__, startoffs, dev->blksz); return -1; } blksperbuf = szwritebuf / dev->blksz; outblock = lldiv(startoffs, dev->blksz); /* skip header */ i = 10; flags = src[3]; if (src[2] != DEFLATED || (flags & RESERVED) != 0) { puts("Error: Bad gzipped data "); return -1; } 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 >= len-8) { puts("Error: gunzip out of data in header"); return -1; } payload_size = len - i - 8; memcpy(&expected_crc, src + len - 8, sizeof(expected_crc)); expected_crc = le32_to_cpu(expected_crc); u32 szuncompressed; memcpy(&szuncompressed, src + len - 4, sizeof(szuncompressed)); if (szexpected == 0) { szexpected = le32_to_cpu(szuncompressed); } else if (szuncompressed != (u32)szexpected) { printf("size of %llx doesn't match trailer low bits %x ", szexpected, szuncompressed); return -1; } if (lldiv(szexpected, dev->blksz) > (dev->lba - outblock)) { printf("%s: uncompressed size %llu exceeds device size ", __func__, szexpected); return -1; } gzwrite_progress_init(szexpected); s.zalloc = gzalloc; s.zfree = gzfree; r = inflateInit2(&s, -MAX_WBITS); if (r != Z_OK) { printf("Error: inflateInit2() returned %d ", r); return -1; } s.next_in = src + i; s.avail_in = payload_size+8; |
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writebuf = (unsigned char *)malloc_cache_aligned(szwritebuf); |
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/* decompress until deflate stream ends or end of file */ do { if (s.avail_in == 0) { printf("%s: weird termination with result %d ", __func__, r); break; } /* run inflate() on input until output buffer not full */ do { unsigned long blocks_written; int numfilled; lbaint_t writeblocks; s.avail_out = szwritebuf; s.next_out = writebuf; r = inflate(&s, Z_SYNC_FLUSH); if ((r != Z_OK) && (r != Z_STREAM_END)) { printf("Error: inflate() returned %d ", r); goto out; } numfilled = szwritebuf - s.avail_out; crc = crc32(crc, writebuf, numfilled); totalfilled += numfilled; if (numfilled < szwritebuf) { writeblocks = (numfilled+dev->blksz-1) / dev->blksz; memset(writebuf+numfilled, 0, dev->blksz-(numfilled%dev->blksz)); } else { writeblocks = blksperbuf; } gzwrite_progress(iteration++, totalfilled, szexpected); |
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blocks_written = blk_dwrite(dev, outblock, writeblocks, writebuf); |
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outblock += blocks_written; if (ctrlc()) { puts("abort "); goto out; } WATCHDOG_RESET(); } while (s.avail_out == 0); /* done when inflate() says it's done */ } while (r != Z_STREAM_END); if ((szexpected != totalfilled) || (crc != expected_crc)) r = -1; else r = 0; out: gzwrite_progress_finish(r, totalfilled, szexpected, expected_crc, crc); free(writebuf); inflateEnd(&s); return r; } |
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#endif |
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/* * Uncompress blocks compressed with zlib without headers */ int zunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp, int stoponerr, int offset) { z_stream s; |
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int err = 0; |
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int r; |
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s.zalloc = gzalloc; s.zfree = gzfree; |
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r = inflateInit2(&s, -MAX_WBITS); if (r != Z_OK) { |
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printf("Error: inflateInit2() returned %d ", r); |
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return -1; |
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} |
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s.next_in = src + offset; s.avail_in = *lenp - offset; |
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s.next_out = dst; s.avail_out = dstlen; |
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do { r = inflate(&s, Z_FINISH); |
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if (stoponerr == 1 && r != Z_STREAM_END && |
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(s.avail_in == 0 || s.avail_out == 0 || r != Z_BUF_ERROR)) { |
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printf("Error: inflate() returned %d ", r); |
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err = -1; break; |
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} |
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} while (r == Z_BUF_ERROR); |
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*lenp = s.next_out - (unsigned char *) dst; inflateEnd(&s); |
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return err; |
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} |