From f3e040230772f978540a71aea43dfde200992922 Mon Sep 17 00:00:00 2001
From: "John Wilbert M. Villamor" <lameguy64@gmail.com>
Date: Sat, 6 Apr 2019 10:11:07 +0800
Subject: First commit

---
 libpsn00b/lzp/lzp.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 libpsn00b/lzp/lzp.c

(limited to 'libpsn00b/lzp/lzp.c')

diff --git a/libpsn00b/lzp/lzp.c b/libpsn00b/lzp/lzp.c
new file mode 100644
index 0000000..1f4fea4
--- /dev/null
+++ b/libpsn00b/lzp/lzp.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "lzp.h"
+
+
+static char* lcase(char* text) {
+
+    int i;
+
+    for(i=0; text[i]!=0x00; i++)
+        text[i] = tolower(text[i]);
+
+	return(text);
+
+}
+
+
+int lzpSearchFile(const char* fileName, void* lzpack) {
+
+	int			i;
+    char		searchName[16];
+	char		compareName[16];
+	LZP_FILE*	fileEntry;
+
+	strcpy(searchName, fileName);
+	lcase(searchName);
+
+	fileEntry = (LZP_FILE*)(lzpack+4);
+	for(i=0; i<((LZP_HEAD*)lzpack)->numFiles; i++) {
+
+        strcpy(compareName, fileEntry[i].fileName);
+        lcase(compareName);
+
+        if (strcmp(searchName, compareName) == 0)
+			return(i);
+
+	}
+
+    return(LZP_ERR_NOTFOUND);
+
+}
+
+LZP_FILE* lzpFileEntry(void* lzpack, int fileNum) {
+
+	if (strncmp("LZP", ((LZP_HEAD*)lzpack)->id, 3) != 0)
+        return(NULL);
+
+	if ((fileNum < 0) || (fileNum > (((LZP_HEAD*)lzpack)->numFiles-1)))
+		return(NULL);
+
+    return(&((LZP_FILE*)(lzpack+4))[fileNum]);
+
+}
+
+int lzpFileSize(void* lzpack, int fileNum) {
+	
+	if (strncmp("LZP", ((LZP_HEAD*)lzpack)->id, 3) != 0)
+        return 0;
+	
+	if ((fileNum < 0) || (fileNum > (((LZP_HEAD*)lzpack)->numFiles-1)))
+		return 0;
+	
+	return ((LZP_FILE*)(lzpack+4))[fileNum].fileSize;
+}
+
+int lzpUnpackFile(void* buff, void* lzpack, int fileNum) {
+
+	LZP_FILE*	fileEntry = &((LZP_FILE*)(lzpack+4))[fileNum];
+	int			unpackedSize;
+
+	// Check ID header
+    if (strncmp("LZP", ((LZP_HEAD*)lzpack)->id, 3) != 0)
+        return(LZP_ERR_INVALID_PACK);
+
+	// Do a CRC16 check of the compressed data's integrity
+	if (lzCRC32(lzpack+fileEntry->offset, fileEntry->packedSize, LZP_CRC32_REMAINDER) != fileEntry->crc)
+		return(LZP_ERR_CRC_MISMATCH);
+
+	// Decompress data to the specified address
+	unpackedSize = lzDecompress(buff, lzpack+fileEntry->offset, fileEntry->packedSize);
+	if (unpackedSize < 0)
+		return(unpackedSize);
+
+	return(unpackedSize);
+
+}
-- 
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