1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "SkOSFile.h"
9 #include "SkString.h"
10 #include "SkTFitsIn.h"
11 #include "SkTemplates.h"
12 #include "SkTypes.h"
13
14 #include <dirent.h>
15 #include <stdio.h>
16 #include <string.h>
17 #include <sys/mman.h>
18 #include <sys/stat.h>
19 #include <sys/types.h>
20 #include <unistd.h>
21
22 #ifdef SK_BUILD_FOR_IOS
23 #include "SkOSFile_ios.h"
24 #endif
25
sk_exists(const char * path,SkFILE_Flags flags)26 bool sk_exists(const char *path, SkFILE_Flags flags) {
27 int mode = F_OK;
28 if (flags & kRead_SkFILE_Flag) {
29 mode |= R_OK;
30 }
31 if (flags & kWrite_SkFILE_Flag) {
32 mode |= W_OK;
33 }
34 #ifdef SK_BUILD_FOR_IOS
35 // if the default path fails, check the bundle (but only if read-only)
36 if (0 == access(path, mode)) {
37 return true;
38 } else {
39 return (kRead_SkFILE_Flag == flags && ios_get_path_in_bundle(path, nullptr));
40 }
41 #else
42 return (0 == access(path, mode));
43 #endif
44 }
45
46 typedef struct {
47 dev_t dev;
48 ino_t ino;
49 } SkFILEID;
50
sk_ino(FILE * a,SkFILEID * id)51 static bool sk_ino(FILE* a, SkFILEID* id) {
52 int fd = fileno(a);
53 if (fd < 0) {
54 return 0;
55 }
56 struct stat status;
57 if (0 != fstat(fd, &status)) {
58 return 0;
59 }
60 id->dev = status.st_dev;
61 id->ino = status.st_ino;
62 return true;
63 }
64
sk_fidentical(FILE * a,FILE * b)65 bool sk_fidentical(FILE* a, FILE* b) {
66 SkFILEID aID, bID;
67 return sk_ino(a, &aID) && sk_ino(b, &bID)
68 && aID.ino == bID.ino
69 && aID.dev == bID.dev;
70 }
71
sk_fmunmap(const void * addr,size_t length)72 void sk_fmunmap(const void* addr, size_t length) {
73 munmap(const_cast<void*>(addr), length);
74 }
75
sk_fdmmap(int fd,size_t * size)76 void* sk_fdmmap(int fd, size_t* size) {
77 struct stat status;
78 if (0 != fstat(fd, &status)) {
79 return nullptr;
80 }
81 if (!S_ISREG(status.st_mode)) {
82 return nullptr;
83 }
84 if (!SkTFitsIn<size_t>(status.st_size)) {
85 return nullptr;
86 }
87 size_t fileSize = static_cast<size_t>(status.st_size);
88
89 void* addr = mmap(nullptr, fileSize, PROT_READ, MAP_PRIVATE, fd, 0);
90 if (MAP_FAILED == addr) {
91 return nullptr;
92 }
93
94 *size = fileSize;
95 return addr;
96 }
97
sk_fileno(FILE * f)98 int sk_fileno(FILE* f) {
99 return fileno(f);
100 }
101
sk_fmmap(FILE * f,size_t * size)102 void* sk_fmmap(FILE* f, size_t* size) {
103 int fd = sk_fileno(f);
104 if (fd < 0) {
105 return nullptr;
106 }
107
108 return sk_fdmmap(fd, size);
109 }
110
sk_qread(FILE * file,void * buffer,size_t count,size_t offset)111 size_t sk_qread(FILE* file, void* buffer, size_t count, size_t offset) {
112 int fd = sk_fileno(file);
113 if (fd < 0) {
114 return SIZE_MAX;
115 }
116 ssize_t bytesRead = pread(fd, buffer, count, offset);
117 if (bytesRead < 0) {
118 return SIZE_MAX;
119 }
120 return bytesRead;
121 }
122
123 ////////////////////////////////////////////////////////////////////////////
124
125 struct SkOSFileIterData {
SkOSFileIterDataSkOSFileIterData126 SkOSFileIterData() : fDIR(nullptr) { }
127 DIR* fDIR;
128 SkString fPath, fSuffix;
129 };
130 static_assert(sizeof(SkOSFileIterData) <= SkOSFile::Iter::kStorageSize, "not_enough_space");
131
Iter()132 SkOSFile::Iter::Iter() { new (fSelf.get()) SkOSFileIterData; }
133
Iter(const char path[],const char suffix[])134 SkOSFile::Iter::Iter(const char path[], const char suffix[]) {
135 new (fSelf.get()) SkOSFileIterData;
136 this->reset(path, suffix);
137 }
138
~Iter()139 SkOSFile::Iter::~Iter() {
140 SkOSFileIterData& self = *static_cast<SkOSFileIterData*>(fSelf.get());
141 if (self.fDIR) {
142 ::closedir(self.fDIR);
143 }
144 self.~SkOSFileIterData();
145 }
146
reset(const char path[],const char suffix[])147 void SkOSFile::Iter::reset(const char path[], const char suffix[]) {
148 SkOSFileIterData& self = *static_cast<SkOSFileIterData*>(fSelf.get());
149 if (self.fDIR) {
150 ::closedir(self.fDIR);
151 self.fDIR = nullptr;
152 }
153 self.fPath.set(path);
154
155 if (path) {
156 self.fDIR = ::opendir(path);
157 #ifdef SK_BUILD_FOR_IOS
158 // check bundle for directory
159 if (!self.fDIR && ios_get_path_in_bundle(path, &self.fPath)) {
160 self.fDIR = ::opendir(self.fPath.c_str());
161 }
162 #endif
163 self.fSuffix.set(suffix);
164 } else {
165 self.fSuffix.reset();
166 }
167 }
168
169 // returns true if suffix is empty, or if str ends with suffix
issuffixfor(const SkString & suffix,const char str[])170 static bool issuffixfor(const SkString& suffix, const char str[]) {
171 size_t suffixLen = suffix.size();
172 size_t strLen = strlen(str);
173
174 return strLen >= suffixLen &&
175 memcmp(suffix.c_str(), str + strLen - suffixLen, suffixLen) == 0;
176 }
177
next(SkString * name,bool getDir)178 bool SkOSFile::Iter::next(SkString* name, bool getDir) {
179 SkOSFileIterData& self = *static_cast<SkOSFileIterData*>(fSelf.get());
180 if (self.fDIR) {
181 dirent* entry;
182
183 while ((entry = ::readdir(self.fDIR)) != nullptr) {
184 struct stat s;
185 SkString str(self.fPath);
186
187 if (!str.endsWith("/") && !str.endsWith("\\")) {
188 str.append("/");
189 }
190 str.append(entry->d_name);
191
192 if (0 == stat(str.c_str(), &s)) {
193 if (getDir) {
194 if (s.st_mode & S_IFDIR) {
195 break;
196 }
197 } else {
198 if (!(s.st_mode & S_IFDIR) && issuffixfor(self.fSuffix, entry->d_name)) {
199 break;
200 }
201 }
202 }
203 }
204 if (entry) { // we broke out with a file
205 if (name) {
206 name->set(entry->d_name);
207 }
208 return true;
209 }
210 }
211 return false;
212 }
213