GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Usefuls routines based on the LzmaTest.c file from LZMA SDK 4.65
+ *
+ * Copyright (C) 2007-2009 Industrie Dial Face S.p.A.
+ * Luigi 'Comio' Mantellini (luigi.mantellini@idf-hit.com)
+ *
+ * Copyright (C) 1999-2005 Igor Pavlov
+ */
+
+/*
+ * LZMA_Alone stream format:
+ *
+ * uchar   Properties[5]
+ * uint64  Uncompressed size
+ * uchar   data[*]
+ *
+ */
+
+#include <config.h>
+#include <common.h>
+#include <watchdog.h>
+
+#ifdef CONFIG_LZMA
+
+#define LZMA_PROPERTIES_OFFSET 0
+#define LZMA_SIZE_OFFSET       LZMA_PROPS_SIZE
+#define LZMA_DATA_OFFSET       LZMA_SIZE_OFFSET+sizeof(uint64_t)
+
+#include "LzmaTools.h"
+#include "LzmaDec.h"
+
+#include <linux/string.h>
+#include <malloc.h>
+
+static void *SzAlloc(void *p, size_t size) { return malloc(size); }
+static void SzFree(void *p, void *address) { free(address); }
+
+int lzmaBuffToBuffDecompress (unsigned char *outStream, SizeT *uncompressedSize,
+                  unsigned char *inStream,  SizeT  length)
+{
+    int res = SZ_ERROR_DATA;
+    int i;
+    ISzAlloc g_Alloc;
+
+    SizeT outSizeFull = 0xFFFFFFFF; /* 4GBytes limit */
+    SizeT outProcessed;
+    SizeT outSize;
+    SizeT outSizeHigh;
+    ELzmaStatus state;
+    SizeT compressedSize = (SizeT)(length - LZMA_PROPS_SIZE);
+
+    debug ("LZMA: Image address............... 0x%p\n", inStream);
+    debug ("LZMA: Properties address.......... 0x%p\n", inStream + LZMA_PROPERTIES_OFFSET);
+    debug ("LZMA: Uncompressed size address... 0x%p\n", inStream + LZMA_SIZE_OFFSET);
+    debug ("LZMA: Compressed data address..... 0x%p\n", inStream + LZMA_DATA_OFFSET);
+    debug ("LZMA: Destination address......... 0x%p\n", outStream);
+
+    memset(&state, 0, sizeof(state));
+
+    outSize = 0;
+    outSizeHigh = 0;
+    /* Read the uncompressed size */
+    for (i = 0; i < 8; i++) {
+        unsigned char b = inStream[LZMA_SIZE_OFFSET + i];
+            if (i < 4) {
+                outSize     += (UInt32)(b) << (i * 8);
+        } else {
+                outSizeHigh += (UInt32)(b) << ((i - 4) * 8);
+        }
+    }
+
+    outSizeFull = (SizeT)outSize;
+    if (sizeof(SizeT) >= 8) {
+        /*
+         * SizeT is a 64 bit uint => We can manage files larger than 4GB!
+         *
+         */
+            outSizeFull |= (((SizeT)outSizeHigh << 16) << 16);
+    } else if (outSizeHigh != 0 || (UInt32)(SizeT)outSize != outSize) {
+        /*
+         * SizeT is a 32 bit uint => We cannot manage files larger than
+         * 4GB!  Assume however that all 0xf values is "unknown size" and
+         * not actually a file of 2^64 bits.
+         *
+         */
+        if (outSizeHigh != (SizeT)-1 || outSize != (SizeT)-1) {
+            debug ("LZMA: 64bit support not enabled.\n");
+            return SZ_ERROR_DATA;
+        }
+    }
+
+    debug("LZMA: Uncompresed size............ 0x%zx\n", outSizeFull);
+    debug("LZMA: Compresed size.............. 0x%zx\n", compressedSize);
+
+    g_Alloc.Alloc = SzAlloc;
+    g_Alloc.Free = SzFree;
+
+    /* Short-circuit early if we know the buffer can't hold the results. */
+    if (outSizeFull != (SizeT)-1 && *uncompressedSize < outSizeFull)
+        return SZ_ERROR_OUTPUT_EOF;
+
+    /* Decompress */
+    outProcessed = min(outSizeFull, *uncompressedSize);
+
+    WATCHDOG_RESET();
+
+    res = LzmaDecode(
+        outStream, &outProcessed,
+        inStream + LZMA_DATA_OFFSET, &compressedSize,
+        inStream, LZMA_PROPS_SIZE, LZMA_FINISH_END, &state, &g_Alloc);
+    *uncompressedSize = outProcessed;
+
+    debug("LZMA: Uncompressed ............... 0x%zx\n", outProcessed);
+
+    if (res != SZ_OK)  {
+        return res;
+    }
+
+    return res;
+}
+
+#endif