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-rw-r--r--minzip/SysUtil.c104
1 files changed, 32 insertions, 72 deletions
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c
index b160c9e3d..09ec8768f 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));
}
}