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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/dictionary.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/dictionary.c')
| -rw-r--r-- | tools/rasm/lzsa-master/src/dictionary.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/tools/rasm/lzsa-master/src/dictionary.c b/tools/rasm/lzsa-master/src/dictionary.c new file mode 100644 index 0000000..fbc4f52 --- /dev/null +++ b/tools/rasm/lzsa-master/src/dictionary.c @@ -0,0 +1,101 @@ +/*
+ * dictionary.c - dictionary implementation
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include "format.h"
+#include "lib.h"
+
+/**
+ * Load dictionary contents
+ *
+ * @param pszDictionaryFilename name of dictionary file, or NULL for none
+ * @param ppDictionaryData pointer to returned dictionary contents, or NULL for none
+ * @param pDictionaryDataSize pointer to returned size of dictionary contents, or 0
+ *
+ * @return LZSA_OK for success, or an error value from lzsa_status_t
+ */
+int lzsa_dictionary_load(const char *pszDictionaryFilename, void **ppDictionaryData, int *pDictionaryDataSize) {
+ unsigned char *pDictionaryData = NULL;
+ int nDictionaryDataSize = 0;
+
+ if (pszDictionaryFilename) {
+ pDictionaryData = (unsigned char *)malloc(BLOCK_SIZE);
+ if (!pDictionaryData) {
+ return LZSA_ERROR_MEMORY;
+ }
+
+ FILE *pDictionaryFile = fopen(pszDictionaryFilename, "rb");
+ if (!pDictionaryFile) {
+ free(pDictionaryData);
+ pDictionaryData = NULL;
+ return LZSA_ERROR_DICTIONARY;
+ }
+
+ fseek(pDictionaryFile, 0, SEEK_END);
+#ifdef _WIN32
+ __int64 nDictionaryFileSize = _ftelli64(pDictionaryFile);
+#else
+ off_t nDictionaryFileSize = ftello(pDictionaryFile);
+#endif
+ if (nDictionaryFileSize > BLOCK_SIZE) {
+ /* Use the last BLOCK_SIZE bytes of the dictionary */
+ fseek(pDictionaryFile, -BLOCK_SIZE, SEEK_END);
+ }
+ else {
+ fseek(pDictionaryFile, 0, SEEK_SET);
+ }
+
+ nDictionaryDataSize = (int)fread(pDictionaryData, 1, BLOCK_SIZE, pDictionaryFile);
+ if (nDictionaryDataSize < 0)
+ nDictionaryDataSize = 0;
+
+ fclose(pDictionaryFile);
+ pDictionaryFile = NULL;
+ }
+
+ *ppDictionaryData = pDictionaryData;
+ *pDictionaryDataSize = nDictionaryDataSize;
+ return LZSA_OK;
+}
+
+/**
+ * Free dictionary contents
+ *
+ * @param ppDictionaryData pointer to pointer to dictionary contents
+ */
+void lzsa_dictionary_free(void **ppDictionaryData) {
+ if (*ppDictionaryData) {
+ free(*ppDictionaryData);
+ *ppDictionaryData = NULL;
+ }
+}
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