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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 "SkString.h"
#include "SkTFitsIn.h"
#include "SkTemplates.h"
#include "SkTypes.h"
#include <dirent.h>
#include <stdio.h>
#include <string.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(FILE* a, SkFILEID* id) {
int fd = fileno(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(FILE* a, FILE* 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 nullptr;
}
if (!S_ISREG(status.st_mode)) {
return nullptr;
}
if (!SkTFitsIn<size_t>(status.st_size)) {
return nullptr;
}
size_t fileSize = static_cast<size_t>(status.st_size);
void* addr = mmap(nullptr, fileSize, PROT_READ, MAP_PRIVATE, fd, 0);
if (MAP_FAILED == addr) {
return nullptr;
}
*size = fileSize;
return addr;
}
int sk_fileno(FILE* f) {
return fileno(f);
}
void* sk_fmmap(FILE* f, size_t* size) {
int fd = sk_fileno(f);
if (fd < 0) {
return nullptr;
}
return sk_fdmmap(fd, size);
}
size_t sk_qread(FILE* file, void* buffer, size_t count, size_t offset) {
int fd = sk_fileno(file);
if (fd < 0) {
return SIZE_MAX;
}
ssize_t bytesRead = pread(fd, buffer, count, offset);
if (bytesRead < 0) {
return SIZE_MAX;
}
return bytesRead;
}
////////////////////////////////////////////////////////////////////////////
struct SkOSFileIterData {
SkOSFileIterData() : fDIR(0) { }
DIR* fDIR;
SkString fPath, fSuffix;
};
static_assert(sizeof(SkOSFileIterData) <= SkOSFile::Iter::kStorageSize, "not_enough_space");
SkOSFile::Iter::Iter() { new (fSelf.get()) SkOSFileIterData; }
SkOSFile::Iter::Iter(const char path[], const char suffix[]) {
new (fSelf.get()) SkOSFileIterData;
this->reset(path, suffix);
}
SkOSFile::Iter::~Iter() {
SkOSFileIterData& self = *static_cast<SkOSFileIterData*>(fSelf.get());
if (self.fDIR) {
::closedir(self.fDIR);
}
self.~SkOSFileIterData();
}
void SkOSFile::Iter::reset(const char path[], const char suffix[]) {
SkOSFileIterData& self = *static_cast<SkOSFileIterData*>(fSelf.get());
if (self.fDIR) {
::closedir(self.fDIR);
self.fDIR = 0;
}
self.fPath.set(path);
if (path) {
self.fDIR = ::opendir(path);
self.fSuffix.set(suffix);
} else {
self.fSuffix.reset();
}
}
// returns true if suffix is empty, or if str ends with suffix
static bool issuffixfor(const SkString& suffix, const char str[]) {
size_t suffixLen = suffix.size();
size_t strLen = strlen(str);
return strLen >= suffixLen &&
memcmp(suffix.c_str(), str + strLen - suffixLen, suffixLen) == 0;
}
bool SkOSFile::Iter::next(SkString* name, bool getDir) {
SkOSFileIterData& self = *static_cast<SkOSFileIterData*>(fSelf.get());
if (self.fDIR) {
dirent* entry;
while ((entry = ::readdir(self.fDIR)) != nullptr) {
struct stat s;
SkString str(self.fPath);
if (!str.endsWith("/") && !str.endsWith("\\")) {
str.append("/");
}
str.append(entry->d_name);
if (0 == stat(str.c_str(), &s)) {
if (getDir) {
if (s.st_mode & S_IFDIR) {
break;
}
} else {
if (!(s.st_mode & S_IFDIR) && issuffixfor(self.fSuffix, entry->d_name)) {
break;
}
}
}
}
if (entry) { // we broke out with a file
if (name) {
name->set(entry->d_name);
}
return true;
}
}
return false;
}
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