Compression algo dependencies, still need hackery...

1 files changed, 96 insertions, 0 deletions

diff --git a/depends/lzma/wrapper/lzip_header.c b/depends/lzma/wrapper/lzip_header.c
new file mode 100644
index 00000000..39872813
--- /dev/null
+++ b/depends/lzma/wrapper/lzip_header.c
@@ -0,0 +1,96 @@
+#include "lzip_header.h"
+
+#include <string.h>
+
+#define ELZMA_LZIP_HEADER_SIZE 6
+#define ELZMA_LZIP_FOOTER_SIZE 12
+
+static void initLzipHeader(struct elzma_file_header *hdr)
+{
+	memset((void *)hdr, 0, sizeof(struct elzma_file_header));
+}
+
+static int parseLzipHeader(const unsigned char *hdrBuf, struct elzma_file_header *hdr)
+{
+	if (0 != strncmp("LZIP", (char *)hdrBuf, 4))
+		return 1;
+	/* XXX: ignore version for now */
+	hdr->pb = 2;
+	hdr->lp = 0;
+	hdr->lc = 3;
+	/* unknown at this point */
+	hdr->isStreamed = 1;
+	hdr->uncompressedSize = 0;
+	hdr->dictSize = 1 << (hdrBuf[5] & 0x1F);
+	return 0;
+}
+
+static int serializeLzipHeader(unsigned char *hdrBuf, const struct elzma_file_header *hdr)
+{
+	hdrBuf[0] = 'L';
+	hdrBuf[1] = 'Z';
+	hdrBuf[2] = 'I';
+	hdrBuf[3] = 'P';
+	hdrBuf[4] = 0;
+	{
+		int r = 0;
+		while ((hdr->dictSize >> r) != 0)
+			r++;
+		hdrBuf[5] = (unsigned char)(r - 1) & 0x1F;
+	}
+	return 0;
+}
+
+static int serializeLzipFooter(struct elzma_file_footer *ftr, unsigned char *ftrBuf)
+{
+	unsigned int i = 0;
+
+	/* first crc32 */
+	for (i = 0; i < 4; i++)
+	{
+		*(ftrBuf++) = (unsigned char)(ftr->crc32 >> (i * 8));
+	}
+
+	/* next data size */
+	for (i = 0; i < 8; i++)
+	{
+		*(ftrBuf++) = (unsigned char)(ftr->uncompressedSize >> (i * 8));
+	}
+
+	/* write version 0 files, omit member length for now*/
+
+	return 0;
+}
+
+static int parseLzipFooter(const unsigned char *ftrBuf, struct elzma_file_footer *ftr)
+{
+	unsigned int i = 0;
+	ftr->crc32 = 0;
+	ftr->uncompressedSize = 0;
+
+	/* first crc32 */
+	for (i = 0; i < 4; i++)
+	{
+		ftr->crc32 += ((unsigned int)*(ftrBuf++) << (i * 8));
+	}
+
+	/* next data size */
+	for (i = 0; i < 8; i++)
+	{
+		ftr->uncompressedSize += (unsigned long long)*(ftrBuf++) << (i * 8);
+	}
+	/* read version 0 files, omit member length for now*/
+
+	return 0;
+}
+
+void initializeLZIPFormatHandler(struct elzma_format_handler *hand)
+{
+	hand->header_size = ELZMA_LZIP_HEADER_SIZE;
+	hand->init_header = initLzipHeader;
+	hand->parse_header = parseLzipHeader;
+	hand->serialize_header = serializeLzipHeader;
+	hand->footer_size = ELZMA_LZIP_FOOTER_SIZE;
+	hand->serialize_footer = serializeLzipFooter;
+	hand->parse_footer = parseLzipFooter;
+}