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| author | Juan J. Martinez <jjm@usebox.net> | 2022-09-06 07:37:20 +0100 |
|---|---|---|
| committer | Juan J. Martinez <jjm@usebox.net> | 2022-09-06 07:37:20 +0100 |
| commit | 30bf0f51335e87812ffeb54e9437f0b6a1514d67 (patch) | |
| tree | 9c85a2de53b4da69fcfaa84488cc6c12ebd3e5d0 /tools/rasm/lzsa-master/src/expand_context.c | |
| parent | d8990284057e6401d0374f439df51879595d804d (diff) | |
| download | ubox-msx-lib-30bf0f51335e87812ffeb54e9437f0b6a1514d67.tar.gz ubox-msx-lib-30bf0f51335e87812ffeb54e9437f0b6a1514d67.zip | |
Updated rasm to 1.7
Diffstat (limited to 'tools/rasm/lzsa-master/src/expand_context.c')
| -rw-r--r-- | tools/rasm/lzsa-master/src/expand_context.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/tools/rasm/lzsa-master/src/expand_context.c b/tools/rasm/lzsa-master/src/expand_context.c new file mode 100644 index 0000000..b02620d --- /dev/null +++ b/tools/rasm/lzsa-master/src/expand_context.c @@ -0,0 +1,76 @@ +/*
+ * expand_context.h - decompressor context definitions
+ *
+ * Copyright (C) 2019 Emmanuel Marty
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors 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.
+ */
+
+/*
+ * Uses the libdivsufsort library Copyright (c) 2003-2008 Yuta Mori
+ *
+ * Inspired by LZ4 by Yann Collet. https://github.com/lz4/lz4
+ * With help, ideas, optimizations and speed measurements by spke <zxintrospec@gmail.com>
+ * With ideas from Lizard by Przemyslaw Skibinski and Yann Collet. https://github.com/inikep/lizard
+ * Also with ideas from smallz4 by Stephan Brumme. https://create.stephan-brumme.com/smallz4/
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "expand_context.h"
+#include "expand_block_v1.h"
+#include "expand_block_v2.h"
+#include "lib.h"
+
+/**
+ * Decompress one data block
+ *
+ * @param pInBlock pointer to compressed data
+ * @param nBlockSize size of compressed data, in bytes
+ * @param pOutData pointer to output decompression buffer (previously decompressed bytes + room for decompressing this block)
+ * @param nOutDataOffset starting index of where to store decompressed bytes in output buffer (and size of previously decompressed bytes)
+ * @param nBlockMaxSize total size of output decompression buffer, in bytes
+ * @param nFormatVersion version of format to use (1-2)
+ * @param nFlags compression flags (LZSA_FLAG_xxx)
+ *
+ * @return size of decompressed data in bytes, or -1 for error
+ */
+int lzsa_decompressor_expand_block(unsigned char *pInBlock, int nBlockSize, unsigned char *pOutData, int nOutDataOffset, int nBlockMaxSize, const int nFormatVersion, const int nFlags) {
+ int nDecompressedSize;
+
+ if (nFlags & LZSA_FLAG_RAW_BACKWARD) {
+ lzsa_reverse_buffer(pInBlock, nBlockSize);
+ }
+
+ if (nFormatVersion == 1)
+ nDecompressedSize = lzsa_decompressor_expand_block_v1(pInBlock, nBlockSize, pOutData, nOutDataOffset, nBlockMaxSize);
+ else if (nFormatVersion == 2)
+ nDecompressedSize = lzsa_decompressor_expand_block_v2(pInBlock, nBlockSize, pOutData, nOutDataOffset, nBlockMaxSize);
+ else
+ nDecompressedSize = -1;
+
+ if (nDecompressedSize != -1 && (nFlags & LZSA_FLAG_RAW_BACKWARD)) {
+ lzsa_reverse_buffer(pOutData + nOutDataOffset, nDecompressedSize);
+ }
+
+ if (nFlags & LZSA_FLAG_RAW_BACKWARD) {
+ lzsa_reverse_buffer(pInBlock, nBlockSize);
+ }
+
+ return nDecompressedSize;
+}
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