/* * (C) Copyright 2000-2006 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <watchdog.h> #include <command.h> #include <image.h> #include <malloc.h> #include <u-boot/zlib.h> #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 void *gzalloc(void *x, unsigned items, unsigned size) { void *p; size *= items; size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1); p = malloc (size); return (p); } void gzfree(void *x, void *addr, unsigned nb) { free (addr); } int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp) { int i, flags; /* skip header */ i = 10; flags = src[3]; if (src[2] != DEFLATED || (flags & RESERVED) != 0) { puts ("Error: Bad gzipped data\n"); 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 >= *lenp) { puts ("Error: gunzip out of data in header\n"); return (-1); } return zunzip(dst, dstlen, src, lenp, 1, i); } /* * 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; int r; s.zalloc = gzalloc; s.zfree = gzfree; r = inflateInit2(&s, -MAX_WBITS); if (r != Z_OK) { printf ("Error: inflateInit2() returned %d\n", r); return -1; } s.next_in = src + offset; s.avail_in = *lenp - offset; s.next_out = dst; s.avail_out = dstlen; do { r = inflate(&s, Z_FINISH); if (stoponerr == 1 && r != Z_STREAM_END && (s.avail_out == 0 || r != Z_BUF_ERROR)) { printf("Error: inflate() returned %d\n", r); inflateEnd(&s); return -1; } s.avail_in = *lenp - offset - (int)(s.next_out - (unsigned char*)dst); } while (r == Z_BUF_ERROR); *lenp = s.next_out - (unsigned char *) dst; inflateEnd(&s); return 0; }