diff options
Diffstat (limited to 'minzip/SysUtil.c')
| -rw-r--r-- | minzip/SysUtil.c | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c deleted file mode 100644 index e7dd17b51..000000000 --- a/minzip/SysUtil.c +++ /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> - -#define LOG_TAG "sysutil" -#include "Log.h" -#include "SysUtil.h" - -static bool sysMapFD(int fd, MemMapping* pMap) { - assert(pMap != NULL); - - struct stat sb; - if (fstat(fd, &sb) == -1) { - LOGE("fstat(%d) failed: %s\n", fd, strerror(errno)); - return false; - } - - void* memPtr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); - if (memPtr == MAP_FAILED) { - LOGE("mmap(%d, R, PRIVATE, %d, 0) failed: %s\n", (int) sb.st_size, fd, strerror(errno)); - return false; - } - - pMap->addr = memPtr; - pMap->length = sb.st_size; - pMap->range_count = 1; - pMap->ranges = malloc(sizeof(MappedRange)); - if (pMap->ranges == NULL) { - LOGE("malloc failed: %s\n", strerror(errno)); - 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) { - LOGE("failed to read block device from header\n"); - 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) { - LOGE("failed to parse block map header\n"); - return -1; - } - if (blksize != 0) { - blocks = ((size-1) / blksize) + 1; - } - if (size == 0 || blksize == 0 || blocks > SIZE_MAX / blksize || range_count == 0) { - LOGE("invalid data in block map file: size %zu, blksize %u, range_count %u\n", - size, blksize, range_count); - return -1; - } - - pMap->range_count = range_count; - pMap->ranges = calloc(range_count, sizeof(MappedRange)); - if (pMap->ranges == NULL) { - LOGE("calloc(%u, %zu) failed: %s\n", range_count, sizeof(MappedRange), strerror(errno)); - return -1; - } - - // Reserve enough contiguous address space for the whole file. - unsigned char* reserve; - reserve = mmap64(NULL, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0); - if (reserve == MAP_FAILED) { - LOGE("failed to reserve address space: %s\n", strerror(errno)); - free(pMap->ranges); - return -1; - } - - int fd = open(block_dev, O_RDONLY); - if (fd < 0) { - LOGE("failed to open block device %s: %s\n", block_dev, strerror(errno)); - 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) { - LOGE("failed to parse range %d in block map\n", i); - success = false; - break; - } - size_t length = (end - start) * blksize; - if (end <= start || (end - start) > SIZE_MAX / blksize || length > remaining_size) { - LOGE("unexpected range in block map: %zu %zu\n", 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) { - LOGE("failed to map block %d: %s\n", i, strerror(errno)); - success = false; - break; - } - pMap->ranges[i].addr = addr; - pMap->ranges[i].length = length; - - next += length; - remaining_size -= length; - } - if (success && remaining_size != 0) { - LOGE("ranges in block map are invalid: remaining_size = %zu\n", 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; - - LOGI("mmapped %d ranges\n", range_count); - - 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) { - LOGE("Unable to open '%s': %s\n", fn+1, strerror(errno)); - return -1; - } - - if (sysMapBlockFile(mapf, pMap) != 0) { - LOGE("Map of '%s' failed\n", fn); - fclose(mapf); - return -1; - } - - fclose(mapf); - } else { - // This is a regular file. - int fd = open(fn, O_RDONLY); - if (fd == -1) { - LOGE("Unable to open '%s': %s\n", fn, strerror(errno)); - return -1; - } - - if (!sysMapFD(fd, pMap)) { - LOGE("Map of '%s' failed\n", fn); - 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) { - LOGE("munmap(%p, %d) failed: %s\n", - pMap->ranges[i].addr, (int)pMap->ranges[i].length, strerror(errno)); - } - } - free(pMap->ranges); - pMap->ranges = NULL; - pMap->range_count = 0; -} |