diff options
Diffstat (limited to 'minzip/SysUtil.cpp')
| -rw-r--r-- | minzip/SysUtil.cpp | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/minzip/SysUtil.cpp b/minzip/SysUtil.cpp deleted file mode 100644 index 4cdd60d9f..000000000 --- a/minzip/SysUtil.cpp +++ /dev/null @@ -1,212 +0,0 @@ -/* - * Copyright 2006 The Android Open Source Project - * - * System utilities. - */ -#include <assert.h> -#include <errno.h> -#include <fcntl.h> -#include <limits.h> -#include <stdbool.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sys/mman.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <unistd.h> - -#include <android-base/logging.h> - -#include "SysUtil.h" - -static bool sysMapFD(int fd, MemMapping* pMap) { - assert(pMap != NULL); - - struct stat sb; - if (fstat(fd, &sb) == -1) { - PLOG(ERROR) << "fstat(" << fd << ") failed"; - return false; - } - - void* memPtr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); - if (memPtr == MAP_FAILED) { - PLOG(ERROR) << "mmap(" << sb.st_size << ", R, PRIVATE, " << fd << ", 0) failed"; - return false; - } - - pMap->addr = reinterpret_cast<unsigned char*>(memPtr); - pMap->length = sb.st_size; - pMap->range_count = 1; - pMap->ranges = reinterpret_cast<MappedRange*>(malloc(sizeof(MappedRange))); - if (pMap->ranges == NULL) { - PLOG(ERROR) << "malloc failed"; - munmap(memPtr, sb.st_size); - return false; - } - pMap->ranges[0].addr = memPtr; - pMap->ranges[0].length = sb.st_size; - - return true; -} - -static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) -{ - char block_dev[PATH_MAX+1]; - size_t size; - unsigned int blksize; - size_t blocks; - unsigned int range_count; - unsigned int i; - - if (fgets(block_dev, sizeof(block_dev), mapf) == NULL) { - PLOG(ERROR) << "failed to read block device from header"; - return -1; - } - for (i = 0; i < sizeof(block_dev); ++i) { - if (block_dev[i] == '\n') { - block_dev[i] = 0; - break; - } - } - - if (fscanf(mapf, "%zu %u\n%u\n", &size, &blksize, &range_count) != 3) { - LOG(ERROR) << "failed to parse block map header"; - return -1; - } - if (blksize != 0) { - blocks = ((size-1) / blksize) + 1; - } - if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0) { - LOG(ERROR) << "invalid data in block map file: size " << size << ", blksize " << blksize - << ", range_count " << range_count; - return -1; - } - - pMap->range_count = range_count; - pMap->ranges = reinterpret_cast<MappedRange*>(calloc(range_count, sizeof(MappedRange))); - if (pMap->ranges == NULL) { - PLOG(ERROR) << "calloc(" << range_count << ", " << sizeof(MappedRange) << ") failed"; - return -1; - } - - // Reserve enough contiguous address space for the whole file. - unsigned char* reserve = reinterpret_cast<unsigned char*>(mmap64(NULL, blocks * blksize, - PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0)); - if (reserve == MAP_FAILED) { - PLOG(ERROR) << "failed to reserve address space"; - free(pMap->ranges); - return -1; - } - - int fd = open(block_dev, O_RDONLY); - if (fd < 0) { - PLOG(ERROR) << "failed to open block device " << block_dev; - munmap(reserve, blocks * blksize); - free(pMap->ranges); - return -1; - } - - unsigned char* next = reserve; - size_t remaining_size = blocks * blksize; - bool success = true; - for (i = 0; i < range_count; ++i) { - size_t start, end; - if (fscanf(mapf, "%zu %zu\n", &start, &end) != 2) { - LOG(ERROR) << "failed to parse range " << i << " in block map"; - success = false; - break; - } - size_t length = (end - start) * blksize; - if (end <= start || ((end - start) > SIZE_MAX / blksize) || length > remaining_size) { - LOG(ERROR) << "unexpected range in block map: " << start << " " << end; - success = false; - break; - } - - void* addr = mmap64(next, length, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize); - if (addr == MAP_FAILED) { - PLOG(ERROR) << "failed to map block " << i; - success = false; - break; - } - pMap->ranges[i].addr = addr; - pMap->ranges[i].length = length; - - next += length; - remaining_size -= length; - } - if (success && remaining_size != 0) { - LOG(ERROR) << "ranges in block map are invalid: remaining_size = " << remaining_size; - success = false; - } - if (!success) { - close(fd); - munmap(reserve, blocks * blksize); - free(pMap->ranges); - return -1; - } - - close(fd); - pMap->addr = reserve; - pMap->length = size; - - LOG(INFO) << "mmapped " << range_count << " ranges"; - - return 0; -} - -int sysMapFile(const char* fn, MemMapping* pMap) -{ - memset(pMap, 0, sizeof(*pMap)); - - if (fn && fn[0] == '@') { - // A map of blocks - FILE* mapf = fopen(fn+1, "r"); - if (mapf == NULL) { - PLOG(ERROR) << "Unable to open '" << (fn+1) << "'"; - return -1; - } - - if (sysMapBlockFile(mapf, pMap) != 0) { - LOG(ERROR) << "Map of '" << fn << "' failed"; - fclose(mapf); - return -1; - } - - fclose(mapf); - } else { - // This is a regular file. - int fd = open(fn, O_RDONLY); - if (fd == -1) { - PLOG(ERROR) << "Unable to open '" << fn << "'"; - return -1; - } - - if (!sysMapFD(fd, pMap)) { - LOG(ERROR) << "Map of '" << fn << "' failed"; - close(fd); - return -1; - } - - close(fd); - } - return 0; -} - -/* - * Release a memory mapping. - */ -void sysReleaseMap(MemMapping* pMap) -{ - int i; - for (i = 0; i < pMap->range_count; ++i) { - if (munmap(pMap->ranges[i].addr, pMap->ranges[i].length) < 0) { - PLOG(ERROR) << "munmap(" << pMap->ranges[i].addr << ", " << pMap->ranges[i].length - << ") failed"; - } - } - free(pMap->ranges); - pMap->ranges = NULL; - pMap->range_count = 0; -} |