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authorThe Android Open Source Project <initial-contribution@android.com>2009-03-04 03:28:14 +0100
committerThe Android Open Source Project <initial-contribution@android.com>2009-03-04 03:28:14 +0100
commitffb48f64fec674c6dd923eb8b1eb3f743e05a8ba (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /minzip/SysUtil.c
parentauto import from //depot/cupcake/@132589 (diff)
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Diffstat (limited to 'minzip/SysUtil.c')
-rw-r--r--minzip/SysUtil.c212
1 files changed, 0 insertions, 212 deletions
diff --git a/minzip/SysUtil.c b/minzip/SysUtil.c
deleted file mode 100644
index 49a2522d6..000000000
--- a/minzip/SysUtil.c
+++ /dev/null
@@ -1,212 +0,0 @@
-/*
- * Copyright 2006 The Android Open Source Project
- *
- * System utilities.
- */
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <limits.h>
-#include <errno.h>
-#include <assert.h>
-
-#define LOG_TAG "minzip"
-#include "Log.h"
-#include "SysUtil.h"
-
-/*
- * Having trouble finding a portable way to get this. sysconf(_SC_PAGE_SIZE)
- * seems appropriate, but we don't have that on the device. Some systems
- * have getpagesize(2), though the linux man page has some odd cautions.
- */
-#define DEFAULT_PAGE_SIZE 4096
-
-
-/*
- * Create an anonymous shared memory segment large enough to hold "length"
- * bytes. The actual segment may be larger because mmap() operates on
- * page boundaries (usually 4K).
- */
-static void* sysCreateAnonShmem(size_t length)
-{
- void* ptr;
-
- ptr = mmap(NULL, length, PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_ANON, -1, 0);
- if (ptr == MAP_FAILED) {
- LOGW("mmap(%d, RW, SHARED|ANON) failed: %s\n", (int) length,
- strerror(errno));
- return NULL;
- }
-
- return ptr;
-}
-
-static int getFileStartAndLength(int fd, off_t *start_, size_t *length_)
-{
- off_t start, end;
- size_t length;
-
- assert(start_ != NULL);
- assert(length_ != NULL);
-
- start = lseek(fd, 0L, SEEK_CUR);
- end = lseek(fd, 0L, SEEK_END);
- (void) lseek(fd, start, SEEK_SET);
-
- if (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;
-}
-
-/*
- * Pull the contents of a file into an new shared memory segment. We grab
- * everything from fd's current offset on.
- *
- * We need to know the length ahead of time so we can allocate a segment
- * of sufficient size.
- */
-int sysLoadFileInShmem(int fd, MemMapping* pMap)
-{
- off_t start;
- size_t length, actual;
- void* memPtr;
-
- assert(pMap != NULL);
-
- if (getFileStartAndLength(fd, &start, &length) < 0)
- return -1;
-
- memPtr = sysCreateAnonShmem(length);
- if (memPtr == NULL)
- return -1;
-
- actual = read(fd, memPtr, length);
- if (actual != length) {
- LOGE("only read %d of %d bytes\n", (int) actual, (int) length);
- sysReleaseShmem(pMap);
- return -1;
- }
-
- pMap->baseAddr = pMap->addr = memPtr;
- pMap->baseLength = pMap->length = length;
-
- return 0;
-}
-
-/*
- * Map a file (from fd's current offset) into a shared, 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".
- */
-int sysMapFileInShmem(int fd, MemMapping* pMap)
-{
- off_t start;
- size_t length;
- void* memPtr;
-
- assert(pMap != NULL);
-
- if (getFileStartAndLength(fd, &start, &length) < 0)
- return -1;
-
- memPtr = mmap(NULL, length, PROT_READ, MAP_FILE | MAP_SHARED, fd, start);
- if (memPtr == MAP_FAILED) {
- LOGW("mmap(%d, R, FILE|SHARED, %d, %d) failed: %s\n", (int) length,
- fd, (int) start, strerror(errno));
- return -1;
- }
-
- pMap->baseAddr = pMap->addr = memPtr;
- pMap->baseLength = pMap->length = length;
-
- return 0;
-}
-
-/*
- * Map part of a file (from fd's current offset) into a shared, read-only
- * memory segment.
- *
- * On success, returns 0 and fills out "pMap". On failure, returns a nonzero
- * value and does not disturb "pMap".
- */
-int sysMapFileSegmentInShmem(int fd, off_t start, long length,
- MemMapping* pMap)
-{
- off_t dummy;
- size_t fileLength, actualLength;
- off_t actualStart;
- int adjust;
- void* memPtr;
-
- assert(pMap != NULL);
-
- if (getFileStartAndLength(fd, &dummy, &fileLength) < 0)
- return -1;
-
- if (start + length > (long)fileLength) {
- LOGW("bad segment: st=%d len=%ld flen=%d\n",
- (int) start, length, (int) fileLength);
- return -1;
- }
-
- /* adjust to be page-aligned */
- adjust = start % DEFAULT_PAGE_SIZE;
- actualStart = start - adjust;
- actualLength = length + adjust;
-
- memPtr = mmap(NULL, actualLength, PROT_READ, MAP_FILE | MAP_SHARED,
- fd, actualStart);
- if (memPtr == MAP_FAILED) {
- LOGW("mmap(%d, R, FILE|SHARED, %d, %d) failed: %s\n",
- (int) actualLength, fd, (int) actualStart, strerror(errno));
- return -1;
- }
-
- pMap->baseAddr = memPtr;
- pMap->baseLength = actualLength;
- pMap->addr = (char*)memPtr + adjust;
- pMap->length = length;
-
- LOGVV("mmap seg (st=%d ln=%d): bp=%p bl=%d ad=%p ln=%d\n",
- (int) start, (int) length,
- pMap->baseAddr, (int) pMap->baseLength,
- pMap->addr, (int) pMap->length);
-
- return 0;
-}
-
-/*
- * Release a memory mapping.
- */
-void sysReleaseShmem(MemMapping* pMap)
-{
- if (pMap->baseAddr == NULL && pMap->baseLength == 0)
- return;
-
- if (munmap(pMap->baseAddr, pMap->baseLength) < 0) {
- LOGW("munmap(%p, %d) failed: %s\n",
- pMap->baseAddr, (int)pMap->baseLength, strerror(errno));
- } else {
- LOGV("munmap(%p, %d) succeeded\n", pMap->baseAddr, pMap->baseLength);
- pMap->baseAddr = NULL;
- pMap->baseLength = 0;
- }
-}
-