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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkOSFile.h"
#include "SkTFitsIn.h"
#include <stdio.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
bool sk_exists(const char *path, SkFILE_Flags flags) {
int mode = F_OK;
if (flags & kRead_SkFILE_Flag) {
mode |= R_OK;
}
if (flags & kWrite_SkFILE_Flag) {
mode |= W_OK;
}
return (0 == access(path, mode));
}
typedef struct {
dev_t dev;
ino_t ino;
} SkFILEID;
static bool sk_ino(SkFILE* a, SkFILEID* id) {
int fd = fileno((FILE*)a);
if (fd < 0) {
return 0;
}
struct stat status;
if (0 != fstat(fd, &status)) {
return 0;
}
id->dev = status.st_dev;
id->ino = status.st_ino;
return true;
}
bool sk_fidentical(SkFILE* a, SkFILE* b) {
SkFILEID aID, bID;
return sk_ino(a, &aID) && sk_ino(b, &bID)
&& aID.ino == bID.ino
&& aID.dev == bID.dev;
}
void sk_fmunmap(const void* addr, size_t length) {
munmap(const_cast<void*>(addr), length);
}
void* sk_fdmmap(int fd, size_t* size) {
struct stat status;
if (0 != fstat(fd, &status)) {
return NULL;
}
if (!S_ISREG(status.st_mode)) {
return NULL;
}
if (!SkTFitsIn<size_t>(status.st_size)) {
return NULL;
}
size_t fileSize = static_cast<size_t>(status.st_size);
void* addr = mmap(NULL, fileSize, PROT_READ, MAP_PRIVATE, fd, 0);
if (MAP_FAILED == addr) {
return NULL;
}
*size = fileSize;
return addr;
}
int sk_fileno(SkFILE* f) {
return fileno((FILE*)f);
}
void* sk_fmmap(SkFILE* f, size_t* size) {
int fd = sk_fileno(f);
if (fd < 0) {
return NULL;
}
return sk_fdmmap(fd, size);
}
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