diff options
Diffstat (limited to 'minzip/SysUtil.c')
| -rw-r--r-- | minzip/SysUtil.c | 104 |
1 files changed, 32 insertions, 72 deletions
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c index b160c9e..09ec876 100644 --- a/minzip/SysUtil.c +++ b/minzip/SysUtil.c @@ -3,86 +3,46 @@ * * System utilities. */ -#include <stdlib.h> +#include <assert.h> +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdbool.h> #include <stdio.h> -#include <unistd.h> +#include <stdlib.h> #include <string.h> #include <sys/mman.h> -#include <sys/types.h> #include <sys/stat.h> -#include <fcntl.h> -#include <limits.h> -#include <errno.h> -#include <assert.h> +#include <sys/types.h> +#include <unistd.h> #define LOG_TAG "sysutil" #include "Log.h" #include "SysUtil.h" -static int getFileStartAndLength(int fd, off_t *start_, size_t *length_) -{ - off_t start, end; - size_t length; - - assert(start_ != NULL); - assert(length_ != NULL); - - // TODO: isn't start always 0 for the single call site? just use fstat instead? - - start = TEMP_FAILURE_RETRY(lseek(fd, 0L, SEEK_CUR)); - end = TEMP_FAILURE_RETRY(lseek(fd, 0L, SEEK_END)); - - if (TEMP_FAILURE_RETRY(lseek(fd, start, SEEK_SET)) == -1 || - start == (off_t) -1 || end == (off_t) -1) { - LOGE("could not determine length of file\n"); - return -1; - } - - length = end - start; - if (length == 0) { - LOGE("file is empty\n"); - return -1; - } - - *start_ = start; - *length_ = length; - - return 0; -} - -/* - * Map a file (from fd's current offset) into a private, read-only memory - * segment. The file offset must be a multiple of the page size. - * - * On success, returns 0 and fills out "pMap". On failure, returns a nonzero - * value and does not disturb "pMap". - */ -static int sysMapFD(int fd, MemMapping* pMap) -{ - off_t start; - size_t length; - void* memPtr; - +static bool sysMapFD(int fd, MemMapping* pMap) { assert(pMap != NULL); - if (getFileStartAndLength(fd, &start, &length) < 0) - return -1; + struct stat sb; + if (fstat(fd, &sb) == -1) { + LOGE("fstat(%d) failed: %s\n", fd, strerror(errno)); + return false; + } - memPtr = mmap(NULL, length, PROT_READ, MAP_PRIVATE, fd, start); + void* memPtr = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0); if (memPtr == MAP_FAILED) { - LOGW("mmap(%d, R, PRIVATE, %d, %d) failed: %s\n", (int) length, - fd, (int) start, strerror(errno)); - return -1; + LOGE("mmap(%d, R, PRIVATE, %d, 0) failed: %s\n", (int) sb.st_size, fd, strerror(errno)); + return false; } pMap->addr = memPtr; - pMap->length = length; + pMap->length = sb.st_size; pMap->range_count = 1; pMap->ranges = malloc(sizeof(MappedRange)); pMap->ranges[0].addr = memPtr; - pMap->ranges[0].length = length; + pMap->ranges[0].length = sb.st_size; - return 0; + return true; } static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) @@ -95,7 +55,7 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) unsigned int i; if (fgets(block_dev, sizeof(block_dev), mapf) == NULL) { - LOGW("failed to read block device from header\n"); + LOGE("failed to read block device from header\n"); return -1; } for (i = 0; i < sizeof(block_dev); ++i) { @@ -106,7 +66,7 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) } if (fscanf(mapf, "%zu %u\n%u\n", &size, &blksize, &range_count) != 3) { - LOGW("failed to parse block map header\n"); + LOGE("failed to parse block map header\n"); return -1; } @@ -120,7 +80,7 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) unsigned char* reserve; reserve = mmap64(NULL, blocks * blksize, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0); if (reserve == MAP_FAILED) { - LOGW("failed to reserve address space: %s\n", strerror(errno)); + LOGE("failed to reserve address space: %s\n", strerror(errno)); return -1; } @@ -129,7 +89,7 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) int fd = open(block_dev, O_RDONLY); if (fd < 0) { - LOGW("failed to open block device %s: %s\n", block_dev, strerror(errno)); + LOGE("failed to open block device %s: %s\n", block_dev, strerror(errno)); return -1; } @@ -137,13 +97,13 @@ static int sysMapBlockFile(FILE* mapf, MemMapping* pMap) for (i = 0; i < range_count; ++i) { int start, end; if (fscanf(mapf, "%d %d\n", &start, &end) != 2) { - LOGW("failed to parse range %d in block map\n", i); + LOGE("failed to parse range %d in block map\n", i); return -1; } void* addr = mmap64(next, (end-start)*blksize, PROT_READ, MAP_PRIVATE | MAP_FIXED, fd, ((off64_t)start)*blksize); if (addr == MAP_FAILED) { - LOGW("failed to map block %d: %s\n", i, strerror(errno)); + LOGE("failed to map block %d: %s\n", i, strerror(errno)); return -1; } pMap->ranges[i].addr = addr; @@ -168,25 +128,25 @@ int sysMapFile(const char* fn, MemMapping* pMap) // A map of blocks FILE* mapf = fopen(fn+1, "r"); if (mapf == NULL) { - LOGV("Unable to open '%s': %s\n", fn+1, strerror(errno)); + LOGE("Unable to open '%s': %s\n", fn+1, strerror(errno)); return -1; } if (sysMapBlockFile(mapf, pMap) != 0) { - LOGW("Map of '%s' failed\n", fn); + LOGE("Map of '%s' failed\n", fn); return -1; } fclose(mapf); } else { // This is a regular file. - int fd = open(fn, O_RDONLY, 0); - if (fd < 0) { + 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) != 0) { + if (!sysMapFD(fd, pMap)) { LOGE("Map of '%s' failed\n", fn); close(fd); return -1; @@ -205,7 +165,7 @@ 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) { - LOGW("munmap(%p, %d) failed: %s\n", + LOGE("munmap(%p, %d) failed: %s\n", pMap->ranges[i].addr, (int)pMap->ranges[i].length, strerror(errno)); } } |