Doug Zongker
2768efdf9f
minzip had some features that were used when reading APKs, but APK handling now uses libziparchive instead of minzip. Remove these unused functions. Change-Id: Iead89209a716bfe9e3d339bf85b3e97e33a41f35
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
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* Copyright 2006 The Android Open Source Project
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*
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* System utilities.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <limits.h>
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#include <errno.h>
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#include <assert.h>
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#define LOG_TAG "minzip"
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#include "Log.h"
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#include "SysUtil.h"
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static int getFileStartAndLength(int fd, off_t *start_, size_t *length_)
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{
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off_t start, end;
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size_t length;
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assert(start_ != NULL);
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assert(length_ != NULL);
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start = lseek(fd, 0L, SEEK_CUR);
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end = lseek(fd, 0L, SEEK_END);
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(void) lseek(fd, start, SEEK_SET);
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if (start == (off_t) -1 || end == (off_t) -1) {
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LOGE("could not determine length of file\n");
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return -1;
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}
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length = end - start;
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if (length == 0) {
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LOGE("file is empty\n");
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return -1;
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}
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*start_ = start;
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*length_ = length;
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return 0;
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}
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/*
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* Map a file (from fd's current offset) into a shared, read-only memory
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* segment. The file offset must be a multiple of the page size.
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*
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* On success, returns 0 and fills out "pMap". On failure, returns a nonzero
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* value and does not disturb "pMap".
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*/
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int sysMapFileInShmem(int fd, MemMapping* pMap)
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{
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off_t start;
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size_t length;
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void* memPtr;
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assert(pMap != NULL);
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if (getFileStartAndLength(fd, &start, &length) < 0)
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return -1;
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memPtr = mmap(NULL, length, PROT_READ, MAP_FILE | MAP_SHARED, fd, start);
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if (memPtr == MAP_FAILED) {
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LOGW("mmap(%d, R, FILE|SHARED, %d, %d) failed: %s\n", (int) length,
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fd, (int) start, strerror(errno));
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return -1;
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}
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pMap->baseAddr = pMap->addr = memPtr;
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pMap->baseLength = pMap->length = length;
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return 0;
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}
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/*
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* Release a memory mapping.
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*/
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void sysReleaseShmem(MemMapping* pMap)
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{
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if (pMap->baseAddr == NULL && pMap->baseLength == 0)
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return;
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if (munmap(pMap->baseAddr, pMap->baseLength) < 0) {
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LOGW("munmap(%p, %d) failed: %s\n",
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pMap->baseAddr, (int)pMap->baseLength, strerror(errno));
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} else {
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LOGV("munmap(%p, %d) succeeded\n", pMap->baseAddr, pMap->baseLength);
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pMap->baseAddr = NULL;
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pMap->baseLength = 0;
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}
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}
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