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author | Sascha Hauer <s.hauer@pengutronix.de> | 2007-07-05 21:23:42 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2007-07-05 21:23:42 +0200 |
commit | bc1e507198ecadf12b4c40f4977487cd4d2df34b (patch) | |
tree | cc48d5136a4743e1701ee1228f47891a822d3974 /lib | |
parent | 75a10b942c77c0720b2f81c971672673b944d922 (diff) | |
download | barebox-bc1e507198ecadf12b4c40f4977487cd4d2df34b.tar.gz barebox-bc1e507198ecadf12b4c40f4977487cd4d2df34b.tar.xz |
add gunzip
Diffstat (limited to 'lib')
-rw-r--r-- | lib/Makefile | 2 | ||||
-rw-r--r-- | lib/gunzip.c | 85 |
2 files changed, 86 insertions, 1 deletions
diff --git a/lib/Makefile b/lib/Makefile index 13aa1ce8d9..0aaf53f69a 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -11,7 +11,7 @@ obj-y += xfuncs.o obj-y += getopt.o obj-y += readkey.o obj-$(CONFIG_BZLIB) += bzlib.o bzlib_crctable.o bzlib_decompress.o bzlib_huffman.o bzlib_randtable.o -obj-$(CONFIG_ZLIB) += zlib.o +obj-$(CONFIG_ZLIB) += zlib.o gunzip.o obj-$(CONFIG_CRC32) += crc32.o obj-$(CONFIG_CMDLINE_EDITING) += readline.o obj-$(CONFIG_SIMPLE_READLINE) += readline_simple.o diff --git a/lib/gunzip.c b/lib/gunzip.c new file mode 100644 index 0000000000..c41568afd6 --- /dev/null +++ b/lib/gunzip.c @@ -0,0 +1,85 @@ +#include <common.h> +#include <zlib.h> +#include <malloc.h> + +#define ZALLOC_ALIGNMENT 16 + +static void *zalloc(void *x, unsigned items, unsigned size) +{ + void *p; + + size *= items; + size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1); + + p = malloc (size); + + return (p); +} + +static void zfree(void *x, void *addr, unsigned nb) +{ + free (addr); +} + +#define HEAD_CRC 2 +#define EXTRA_FIELD 4 +#define ORIG_NAME 8 +#define COMMENT 0x10 +#define RESERVED 0xe0 + +#define DEFLATED 8 + +int gunzip(void *dst, int dstlen, unsigned char *src, unsigned long *lenp) +{ + z_stream s; + int r, 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); + } + + s.zalloc = zalloc; + s.zfree = zfree; +#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) + s.outcb = (cb_func)WATCHDOG_RESET; +#else + s.outcb = Z_NULL; +#endif /* CONFIG_HW_WATCHDOG */ + + r = inflateInit2(&s, -MAX_WBITS); + if (r != Z_OK) { + printf ("Error: inflateInit2() returned %d\n", r); + return (-1); + } + s.next_in = src + i; + s.avail_in = *lenp - i; + s.next_out = dst; + s.avail_out = dstlen; + r = inflate(&s, Z_FINISH); + if (r != Z_OK && r != Z_STREAM_END) { + printf ("Error: inflate() returned %d\n", r); + return (-1); + } + *lenp = s.next_out - (unsigned char *) dst; + inflateEnd(&s); + + return (0); +} |