From 2c8dc0b855c38c5204d398ad306fa9cf43be1ada Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Mr=C3=A1zek?= <peterix@gmail.com>
Date: Thu, 26 Sep 2013 02:58:09 +0200
Subject: Compression algo dependencies, still need hackery...

---
 depends/lzma/wrapper/lzma_header.c | 134 +++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 depends/lzma/wrapper/lzma_header.c

(limited to 'depends/lzma/wrapper/lzma_header.c')

diff --git a/depends/lzma/wrapper/lzma_header.c b/depends/lzma/wrapper/lzma_header.c
new file mode 100644
index 00000000..ab32549f
--- /dev/null
+++ b/depends/lzma/wrapper/lzma_header.c
@@ -0,0 +1,134 @@
+/*
+ * Written in 2009 by Lloyd Hilaiel
+ *
+ * License
+ *
+ * All the cruft you find here is public domain.  You don't have to credit
+ * anyone to use this code, but my personal request is that you mention
+ * Igor Pavlov for his hard, high quality work.
+ */
+
+/* XXX: clean this up, it's mostly lifted from pavel */
+
+#include "lzma_header.h"
+
+#include <string.h>
+#include <assert.h>
+
+#define ELZMA_LZMA_HEADER_SIZE 13
+#define ELZMA_LZMA_PROPSBUF_SIZE 5
+
+/****************
+  Header parsing
+ ****************/
+
+#ifndef UINT64_MAX
+#define UINT64_MAX ((unsigned long long)-1)
+#endif
+
+/* Parse the properties byte */
+static char lzmadec_header_properties(unsigned char *pb, unsigned char *lp, unsigned char *lc,
+									  const unsigned char c)
+{
+	/*	 pb, lp and lc are encoded into a single byte.  */
+	if (c > (9 * 5 * 5))
+		return -1;
+	*pb = c / (9 * 5);	   /* 0 <= pb <= 4 */
+	*lp = (c % (9 * 5)) / 9; /* 0 <= lp <= 4 */
+	*lc = c % 9;			 /* 0 <= lc <= 8 */
+
+	assert(*pb < 5 && *lp < 5 && *lc < 9);
+	return 0;
+}
+
+/* Parse the dictionary size (4 bytes, little endian) */
+static char lzmadec_header_dictionary(unsigned int *size, const unsigned char *buffer)
+{
+	unsigned int i;
+	*size = 0;
+	for (i = 0; i < 4; i++)
+		*size += (unsigned int)(*buffer++) << (i * 8);
+	/* The dictionary size is limited to 256 MiB (checked from
+	 * LZMA SDK 4.30) */
+	if (*size > (1 << 28))
+		return -1;
+	return 0;
+}
+
+/* Parse the uncompressed size field (8 bytes, little endian) */
+static void lzmadec_header_uncompressed(unsigned long long *size, unsigned char *is_streamed,
+										const unsigned char *buffer)
+{
+	unsigned int i;
+
+	/* Streamed files have all 64 bits set in the size field.
+	 * We don't know the uncompressed size beforehand. */
+	*is_streamed = 1; /* Assume streamed. */
+	*size = 0;
+	for (i = 0; i < 8; i++)
+	{
+		*size += (unsigned long long)buffer[i] << (i * 8);
+		if (buffer[i] != 255)
+			*is_streamed = 0;
+	}
+	assert((*is_streamed == 1 && *size == UINT64_MAX) ||
+		   (*is_streamed == 0 && *size < UINT64_MAX));
+}
+
+static void initLzmaHeader(struct elzma_file_header *hdr)
+{
+	memset((void *)hdr, 0, sizeof(struct elzma_file_header));
+}
+
+static int parseLzmaHeader(const unsigned char *hdrBuf, struct elzma_file_header *hdr)
+{
+	if (lzmadec_header_properties(&(hdr->pb), &(hdr->lp), &(hdr->lc), *hdrBuf) ||
+		lzmadec_header_dictionary(&(hdr->dictSize), hdrBuf + 1))
+	{
+		return 1;
+	}
+	lzmadec_header_uncompressed(&(hdr->uncompressedSize), &(hdr->isStreamed), hdrBuf + 5);
+
+	return 0;
+}
+
+static int serializeLzmaHeader(unsigned char *hdrBuf, const struct elzma_file_header *hdr)
+{
+	unsigned int i;
+
+	memset((void *)hdrBuf, 0, ELZMA_LZMA_HEADER_SIZE);
+
+	/* encode lc, pb, and lp */
+	*hdrBuf++ = hdr->lc + (hdr->pb * 45) + (hdr->lp * 45 * 9);
+
+	/* encode dictionary size */
+	for (i = 0; i < 4; i++)
+	{
+		*(hdrBuf++) = (unsigned char)(hdr->dictSize >> (i * 8));
+	}
+
+	/* encode uncompressed size */
+	for (i = 0; i < 8; i++)
+	{
+		if (hdr->isStreamed)
+		{
+			*(hdrBuf++) = 0xff;
+		}
+		else
+		{
+			*(hdrBuf++) = (unsigned char)(hdr->uncompressedSize >> (i * 8));
+		}
+	}
+
+	return 0;
+}
+
+void initializeLZMAFormatHandler(struct elzma_format_handler *hand)
+{
+	hand->header_size = ELZMA_LZMA_HEADER_SIZE;
+	hand->init_header = initLzmaHeader;
+	hand->parse_header = parseLzmaHeader;
+	hand->serialize_header = serializeLzmaHeader;
+	hand->footer_size = 0;
+	hand->serialize_footer = NULL;
+}
-- 
cgit v1.2.3