summaryrefslogtreecommitdiff
path: root/package/heirloom-cpio/src/blast.h
diff options
context:
space:
mode:
Diffstat (limited to 'package/heirloom-cpio/src/blast.h')
-rw-r--r--package/heirloom-cpio/src/blast.h76
1 files changed, 76 insertions, 0 deletions
diff --git a/package/heirloom-cpio/src/blast.h b/package/heirloom-cpio/src/blast.h
new file mode 100644
index 000000000..0c16d1391
--- /dev/null
+++ b/package/heirloom-cpio/src/blast.h
@@ -0,0 +1,76 @@
+/*
+ * Changes by Gunnar Ritter, Freiburg i. Br., Germany, February 2004.
+ *
+ * Sccsid @(#)blast.h 1.2 (gritter) 2/17/04
+ */
+/* blast.h -- interface for blast.c
+ Copyright (C) 2003 Mark Adler
+ version 1.1, 16 Feb 2003
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the author be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+
+ Mark Adler madler@alumni.caltech.edu
+ */
+
+
+/*
+ * blast() decompresses the PKWare Data Compression Library (DCL) compressed
+ * format. It provides the same functionality as the explode() function in
+ * that library. (Note: PKWare overused the "implode" verb, and the format
+ * used by their library implode() function is completely different and
+ * incompatible with the implode compression method supported by PKZIP.)
+ */
+
+
+typedef unsigned (*blast_in)(void *how, unsigned char **buf);
+typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len);
+/* Definitions for input/output functions passed to blast(). See below for
+ * what the provided functions need to do.
+ */
+
+
+int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow);
+/* Decompress input to output using the provided infun() and outfun() calls.
+ * On success, the return value of blast() is zero. If there is an error in
+ * the source data, i.e. it is not in the proper format, then a negative value
+ * is returned. If there is not enough input available or there is not enough
+ * output space, then a positive error is returned.
+ *
+ * The input function is invoked: len = infun(how, &buf), where buf is set by
+ * infun() to point to the input buffer, and infun() returns the number of
+ * available bytes there. If infun() returns zero, then blast() returns with
+ * an input error. (blast() only asks for input if it needs it.) inhow is for
+ * use by the application to pass an input descriptor to infun(), if desired.
+ *
+ * The output function is invoked: err = outfun(how, buf, len), where the bytes
+ * to be written are buf[0..len-1]. If err is not zero, then blast() returns
+ * with an output error. outfun() is always called with len <= 4096. outhow
+ * is for use by the application to pass an output descriptor to outfun(), if
+ * desired.
+ *
+ * The return codes are:
+ *
+ * 2: ran out of input before completing decompression
+ * 1: output error before completing decompression
+ * 0: successful decompression
+ * -1: literal flag not zero or one
+ * -2: dictionary size not in 4..6
+ * -3: distance is too far back
+ *
+ * At the bottom of blast.c is an example program that uses blast() that can be
+ * compiled to produce a command-line decompression filter by defining TEST.
+ */