Attachment 215651 Details for Bug 318031 – test.c

test.c

test.c (text/plain), 2.42 KB, created by Bastien Nocera on 2007-10-04 10:27:58 UTC

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Creator: Bastien Nocera

Created: 2007-10-04 10:27:58 UTC

Size: 2.42 KB

patch

obsolete

>
>/* gcc -Wall -g -o test test.c `pkg-config --libs --cflags glib-2.0` -lz */
>
>#include <string.h>
>#include <glib.h>
>#include <zlib.h>
>
>/* gzip flag byte */
>#define GZIP_IS_ASCII		0x01 /* file contains text ? */
>#define GZIP_HEADER_CRC		0x02 /* there is a CRC in the header */
>#define GZIP_EXTRA_FIELD	0x04 /* there is an 'extra' field */
>#define GZIP_ORIGINAL_NAME	0x08 /* the original is stored */
>#define GZIP_HAS_COMMENT	0x10 /* There is a comment in the header */
>#define GZIP_HEADER_FLAGS (unsigned)(GZIP_IS_ASCII |GZIP_HEADER_CRC |GZIP_EXTRA_FIELD |GZIP_ORIGINAL_NAME |GZIP_HAS_COMMENT)
>
>#define GSF_LE_GET_GUINT32(p)				\
>	(guint32)((((guint8 const *)(p))[0] << 0)  |	\
>		  (((guint8 const *)(p))[1] << 8)  |	\
>		  (((guint8 const *)(p))[2] << 16) |	\
>		  (((guint8 const *)(p))[3] << 24))
>
>static guint32
>check_header (char *data, gsize len)
>{
>	static guint8 const signature[2] = {0x1f, 0x8b};
>	unsigned flags;
>
>	if (len < 2 + 1 + 1 + 6)
>		return -1;
>
>	/* Check signature */
>	if (memcmp (data, signature, sizeof (signature)) != 0)
>		return -1;
>
>	/* verify flags and compression type */
>	flags  = data[3];
>	if (data[2] != Z_DEFLATED || (flags & ~GZIP_HEADER_FLAGS) != 0)
>		return TRUE;
>
>	/* Get the uncompressed size */
>	/* FIXME, but how?  The size read here is modulo 2^32.  */
>	return GSF_LE_GET_GUINT32 (data + len - 4);
>}
>
>static char *
>decompress_gzip (char *data, gsize len)
>{
>	guint32 retlen;
>	gulong reallen;
>	char *ret;
>	int i, j;
>
>	retlen = check_header (data, len);
>	if (retlen < 0)
>		return NULL;
>	g_message ("retlen %d", retlen);
>	/* +1 so we can NULL-terminate */
>	ret = g_malloc0 (retlen + 1);
>	reallen = retlen;
>	if ((i = uncompress ((guchar *) ret, (uLongf *) &reallen, (guchar *) data + j, (uLongf) len - j)) != Z_OK) {
>		g_message ("uncompress didn't work %d", i);
>		g_free (ret);
>		return NULL;
>	}
>
>	return ret;
>}
>
>int main (int argc, char **argv)
>{
>#if 0
>	GMappedFile *mapped;
>	char *uncompressed;
>
>	mapped = g_mapped_file_new (argv[1], FALSE, NULL);
>	if (!mapped) {
>		g_warning ("couldn't map %s", argv[1]);
>		return 1;
>	}
>
>	uncompressed = decompress_gzip (
>	    g_mapped_file_get_contents (mapped),
>	    g_mapped_file_get_length (mapped));
>#else
>	char *contents, *uncompressed;
>	gsize len;
>
>	if (g_file_get_contents (argv[1], &contents, &len, NULL) == FALSE) {
>		g_message ("couldn't get contents for %s", argv[1]);
>		return 1;
>	}
>
>	uncompressed = decompress_gzip (contents, len);
>#endif
>	g_message ("podcast data: %s", uncompressed);
>
>	return 0;
>}
>

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Attachments on bug 318031: 215651