cbfstool: Replace C++ code with C code

cbfstool was using a C++ wrapper around the C written LZMA functions.
And a C wrapper around those C++ functions. Drop the mess and rewrite
the functions to be all C.

Change-Id: Ieb6645a42f19efcc857be323ed8bdfcd9f48ee7c
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/3010
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/cbfstool/lzma/lzma.c

@@ -0,0 +1,198 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include "../common.h"
+#include "C/LzmaDec.h"
+#include "C/LzmaEnc.h"
+
+/* Endianness / unaligned memory access handling */
+
+#if defined(__x86_64__) || defined(__i386__)
+#define LITTLE_ENDIAN_AND_UNALIGNED_ACCESS_OK
+#else
+#undef LITTLE_ENDIAN_AND_UNALIGNED_ACCESS_OK
+#endif
+
+#define L (uint64_t)
+
+static inline uint64_t get_64(const void *p)
+{
+#ifdef LITTLE_ENDIAN_AND_UNALIGNED_ACCESS_OK
+	return *(const uint64_t *)p;
+#else
+	const unsigned char *data = (const unsigned char *)p;
+	return (L data[0]) | (L data[1] << 8) | (L data[2] << 16) |
+		(L data[3] << 24) | (L data [4] << 32) | (L data[5] << 40) |
+		(L data[6] << 48) | (L data[7] << 56);
+#endif
+}
+
+static void put_64(void *p, uint64_t value)
+{
+#ifdef LITTLE_ENDIAN_AND_UNALIGNED_ACCESS_OK
+	*(uint64_t *) p = value;
+#else
+	unsigned char *data = (unsigned char *)p;
+	data[0] = value & 0xff;
+	data[1] = (value >> 8) & 0xff;
+	data[2] = (value >> 16) & 0xff;
+	data[3] = (value >> 24) & 0xff;
+	data[4] = (value >> 32) & 0xff;
+	data[5] = (value >> 40) & 0xff;
+	data[6] = (value >> 48) & 0xff;
+	data[7] = (value >> 56) & 0xff;
+#endif
+}
+
+/* Memory Allocation API */
+
+static void *SzAlloc(void *unused, size_t size)
+{
+	return malloc(size);
+}
+
+static void SzFree(void *unused, void *address)
+{
+	free(address);
+}
+
+static ISzAlloc LZMAalloc = { SzAlloc, SzFree };
+
+/* Streaming API */
+
+typedef struct vector {
+	char *p;
+	size_t pos;
+	size_t size;
+} vector_t;
+
+static vector_t instream, outstream;
+
+static SRes Read(void *unused, void *buf, size_t *size)
+{
+	if ((instream.size - instream.pos) < *size)
+		*size = instream.size - instream.pos;
+	memcpy(buf, instream.p + instream.pos, *size);
+	instream.pos += *size;
+	return SZ_OK;
+}
+
+static size_t Write(void *unused, const void *buf, size_t size)
+{
+	if(outstream.size - outstream.pos < size)
+		size = outstream.size - outstream.pos;
+	memcpy(outstream.p + outstream.pos, buf, size);
+	outstream.pos += size;
+	return size;
+}
+
+static ISeqInStream is = { Read };
+static ISeqOutStream os = { Write };
+
+/**
+ * Compress a buffer with lzma
+ * Don't copy the result back if it is too large.
+ * @param in a pointer to the buffer
+ * @param in_len the length in bytes
+ * @param out a pointer to a buffer of at least size in_len
+ * @param out_len a pointer to the compressed length of in
+ */
+
+void do_lzma_compress(char *in, int in_len, char *out, int *out_len)
+{
+	if (in_len == 0) {
+		ERROR("LZMA: Input length is zero.\n");
+		return;
+	}
+
+	CLzmaEncProps props;
+	LzmaEncProps_Init(&props);
+	props.dictSize = in_len;
+	props.pb = 0; /* PosStateBits, default: 2, range: 0..4 */
+	props.lp = 0; /* LiteralPosStateBits, default: 0, range: 0..4 */
+	props.lc = 1; /* LiteralContextBits, default: 3, range: 0..8 */
+	props.fb = 273; /* NumFastBytes */
+	props.mc = 0; /* MatchFinderCycles, default: 0 */
+	props.algo = 1; /* AlgorithmNo, apparently, 0 and 1 are valid values. 0 = fast mode */
+	props.numThreads = 1;
+
+	switch (props.algo) {
+	case 0:	// quick: HC4
+		props.btMode = 0;
+		props.level = 1;
+		break;
+	case 1:	// full: BT4
+	default:
+		props.level = 9;
+		props.btMode = 1;
+		props.numHashBytes = 4;
+		break;
+	}
+
+	CLzmaEncHandle p = LzmaEnc_Create(&LZMAalloc);
+
+	int res = LzmaEnc_SetProps(p, &props);
+	if (res != SZ_OK) {
+		ERROR("LZMA: LzmaEnc_SetProps failed.\n");
+		return;
+	}
+
+	unsigned char propsEncoded[LZMA_PROPS_SIZE + 8];
+	size_t propsSize = sizeof propsEncoded;
+	res = LzmaEnc_WriteProperties(p, propsEncoded, &propsSize);
+	if (res != SZ_OK) {
+		ERROR("LZMA: LzmaEnc_WriteProperties failed.\n");
+		return;
+	}
+
+	instream.p = in;
+	instream.size = in_len;
+
+	outstream.p = out;
+	outstream.size = in_len;
+
+	put_64(propsEncoded + LZMA_PROPS_SIZE, in_len);
+	Write(&os, propsEncoded, LZMA_PROPS_SIZE+8);
+
+	res = LzmaEnc_Encode(p, &os, &is, 0, &LZMAalloc, &LZMAalloc);
+	if (res != SZ_OK) {
+		ERROR("LZMA: LzmaEnc_Encode failed %d.\n", res);
+		return;
+	}
+
+	*out_len = outstream.pos;
+}
+
+void do_lzma_uncompress(char *dst, int dst_len, char *src, int src_len)
+{
+	if (src_len <= LZMA_PROPS_SIZE + 8) {
+		ERROR("LZMA: Input length is too small.\n");
+		return;
+	}
+
+	uint64_t out_sizemax = get_64(&src[LZMA_PROPS_SIZE]);
+
+	if (out_sizemax > (size_t) dst_len) {
+		ERROR("Not copying %d bytes to %d-byte buffer!\n",
+			(unsigned int)out_sizemax, dst_len);
+		return;
+	}
+
+	ELzmaStatus status;
+
+	size_t destlen = out_sizemax;
+	size_t srclen = src_len - (LZMA_PROPS_SIZE + 8);
+
+	int res = LzmaDecode((Byte *) dst, &destlen,
+			     (Byte *) &src[LZMA_PROPS_SIZE + 8], &srclen,
+			     (Byte *) &src[0], LZMA_PROPS_SIZE,
+			     LZMA_FINISH_END,
+			     &status,
+			     &LZMAalloc);
+
+	if (res != SZ_OK) {
+		ERROR("Error while decompressing.\n");
+		return;
+	}
+}