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/*
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/*
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* This file is part of the FDNPKG project
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* This file is part of pkg (SvarDOS)
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* http://fdnpkg.sourceforge.net
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*
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* Copyright (C) 2012-2016 Mateusz Viste. All rights reserved.
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* Copyright (C) 2012-2021 Mateusz Viste.
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*
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*
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* Simple library providing functions to unzip files from zip archives.
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* Simple library providing functions to unzip files from zip archives.
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*/
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*/
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#include <stdio.h> /* printf(), FILE, fclose()... */
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#include <stdio.h> /* printf(), FILE, fclose()... */
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#include <utime.h> /* utime() */
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#include <utime.h> /* utime() */
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#include <unistd.h> /* unlink() */
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#include <unistd.h> /* unlink() */
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#include "crc32.h"
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#include "crc32.h"
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#include "kprintf.h"
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#include "kprintf.h"
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#include "inf.h" /* DEFLATE support */
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#include "inf.h" /* INFLATE support */
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#include "libunzip.h" /* include self for control */
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#include "libunzip.h" /* include self for control */
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/* converts a "DOS format" timestamp into unix timestamp. The DOS timestamp is constructed an array of 4 bytes, that contains following data at the bit level:
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/* converts a "DOS format" timestamp into unix timestamp. The DOS timestamp is constructed an array of 4 bytes, that contains following data at the bit level:
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* month is always within 1-12 range;
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* month is always within 1-12 range;
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* year starts from 1980 and continues for 127 years
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* year starts from 1980 and continues for 127 years
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* seconds are actually not 0-59 but rather 0-29 as there are only 32 possible values – to get actual seconds multiply this field by 2;
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* seconds are actually not 0-59 but rather 0-29 as there are only 32 possible values – to get actual seconds multiply this field by 2;
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* minutes are always within 0-59 range;
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* minutes are always within 0-59 range;
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* hours are always within 0-23 range. */
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* hours are always within 0-23 range. */
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static time_t dostime2unix(unsigned char *buff) {
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static time_t dostime2unix(const unsigned char *buff) {
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struct tm curtime;
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struct tm curtime;
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time_t result;
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time_t result;
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memset(&curtime, 0, sizeof(curtime)); /* make sure to set everything in curtime to 0's */
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memset(&curtime, 0, sizeof(curtime)); /* make sure to set everything in curtime to 0's */
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curtime.tm_sec = (buff[0] & 31) << 1; /* seconds (0..60) */
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curtime.tm_sec = (buff[0] & 31) << 1; /* seconds (0..60) */
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curtime.tm_min = (((buff[1] << 8) | buff[0]) >> 5) & 63 ; /* minutes after the hour (0..59) */
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curtime.tm_min = (((buff[1] << 8) | buff[0]) >> 5) & 63 ; /* minutes after the hour (0..59) */
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}
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}
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/* unzips a file. zipfd points to the open zip file, curzipnode to the entry to extract, and fulldestfilename is the destination file where to unzip it. returns 0 on success, non-zero otherwise. */
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/* unzips a file. zipfd points to the open zip file, curzipnode to the entry to extract, and fulldestfilename is the destination file where to unzip it. returns 0 on success, non-zero otherwise. */
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int zip_unzip(FILE *zipfd, struct ziplist *curzipnode, char *fulldestfilename) {
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int zip_unzip(FILE *zipfd, struct ziplist *curzipnode, const char *fulldestfilename) {
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#define buffsize 32 * 1024l /* MUST be at least 32K */
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#define buffsize 32 * 1024l /* MUST be at least 32K */
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FILE *filefd;
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FILE *filefd;
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unsigned long cksum;
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unsigned long cksum;
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int extract_res;
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int extract_res;
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unsigned char *buff;
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unsigned char *buff;
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