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 "include/core/SkString.h"
9 #include "include/core/SkTypes.h"
10 #include "include/private/SkTFitsIn.h"
11 #include "include/private/SkTemplates.h"
12 #include "src/core/SkOSFile.h"
13
14 #include <dirent.h>
15 #include <new>
16 #include <stdio.h>
17 #include <string.h>
18 #include <sys/mman.h>
19 #include <sys/stat.h>
20 #include <sys/types.h>
21 #include <unistd.h>
22
23 #ifdef SK_BUILD_FOR_IOS
24 #include "src/ports/SkOSFile_ios.h"
25 #endif
26
sk_exists(const char * path,SkFILE_Flags flags)27 bool sk_exists(const char *path, SkFILE_Flags flags) {
28 int mode = F_OK;
29 if (flags & kRead_SkFILE_Flag) {
30 mode |= R_OK;
31 }
32 if (flags & kWrite_SkFILE_Flag) {
33 mode |= W_OK;
34 }
35 #ifdef SK_BUILD_FOR_IOS
36 // if the default path fails, check the bundle (but only if read-only)
37 if (0 == access(path, mode)) {
38 return true;
39 } else {
40 return (kRead_SkFILE_Flag == flags && ios_get_path_in_bundle(path, nullptr));
41 }
42 #else
43 return (0 == access(path, mode));
44 #endif
45 }
46
47 typedef struct {
48 dev_t dev;
49 ino_t ino;
50 } SkFILEID;
51
sk_ino(FILE * a,SkFILEID * id)52 static bool sk_ino(FILE* a, SkFILEID* id) {
53 int fd = fileno(a);
54 if (fd < 0) {
55 return 0;
56 }
57 struct stat status;
58 if (0 != fstat(fd, &status)) {
59 return 0;
60 }
61 id->dev = status.st_dev;
62 id->ino = status.st_ino;
63 return true;
64 }
65
sk_fidentical(FILE * a,FILE * b)66 bool sk_fidentical(FILE* a, FILE* b) {
67 SkFILEID aID, bID;
68 return sk_ino(a, &aID) && sk_ino(b, &bID)
69 && aID.ino == bID.ino
70 && aID.dev == bID.dev;
71 }
72
sk_fmunmap(const void * addr,size_t length)73 void sk_fmunmap(const void* addr, size_t length) {
74 munmap(const_cast<void*>(addr), length);
75 }
76
sk_fdmmap(int fd,size_t * size)77 void* sk_fdmmap(int fd, size_t* size) {
78 struct stat status;
79 if (0 != fstat(fd, &status)) {
80 return nullptr;
81 }
82 if (!S_ISREG(status.st_mode)) {
83 return nullptr;
84 }
85 if (!SkTFitsIn<size_t>(status.st_size)) {
86 return nullptr;
87 }
88 size_t fileSize = static_cast<size_t>(status.st_size);
89
90 void* addr = mmap(nullptr, fileSize, PROT_READ, MAP_PRIVATE, fd, 0);
91 if (MAP_FAILED == addr) {
92 return nullptr;
93 }
94
95 *size = fileSize;
96 return addr;
97 }
98
sk_fileno(FILE * f)99 int sk_fileno(FILE* f) {
100 return fileno(f);
101 }
102
sk_fmmap(FILE * f,size_t * size)103 void* sk_fmmap(FILE* f, size_t* size) {
104 int fd = sk_fileno(f);
105 if (fd < 0) {
106 return nullptr;
107 }
108
109 return sk_fdmmap(fd, size);
110 }
111
sk_qread(FILE * file,void * buffer,size_t count,size_t offset)112 size_t sk_qread(FILE* file, void* buffer, size_t count, size_t offset) {
113 int fd = sk_fileno(file);
114 if (fd < 0) {
115 return SIZE_MAX;
116 }
117 ssize_t bytesRead = pread(fd, buffer, count, offset);
118 if (bytesRead < 0) {
119 return SIZE_MAX;
120 }
121 return bytesRead;
122 }
123
124 ////////////////////////////////////////////////////////////////////////////
125
126 struct SkOSFileIterData {
SkOSFileIterDataSkOSFileIterData127 SkOSFileIterData() : fDIR(nullptr) { }
128 DIR* fDIR;
129 SkString fPath, fSuffix;
130 };
131 static_assert(sizeof(SkOSFileIterData) <= SkOSFile::Iter::kStorageSize, "not_enough_space");
132
Iter()133 SkOSFile::Iter::Iter() { new (fSelf) SkOSFileIterData; }
134
Iter(const char path[],const char suffix[])135 SkOSFile::Iter::Iter(const char path[], const char suffix[]) {
136 new (fSelf) SkOSFileIterData;
137 this->reset(path, suffix);
138 }
139
~Iter()140 SkOSFile::Iter::~Iter() {
141 SkOSFileIterData& self = *reinterpret_cast<SkOSFileIterData*>(fSelf);
142 if (self.fDIR) {
143 ::closedir(self.fDIR);
144 }
145 self.~SkOSFileIterData();
146 }
147
reset(const char path[],const char suffix[])148 void SkOSFile::Iter::reset(const char path[], const char suffix[]) {
149 SkOSFileIterData& self = *reinterpret_cast<SkOSFileIterData*>(fSelf);
150 if (self.fDIR) {
151 ::closedir(self.fDIR);
152 self.fDIR = nullptr;
153 }
154 self.fPath.set(path);
155
156 if (path) {
157 self.fDIR = ::opendir(path);
158 #ifdef SK_BUILD_FOR_IOS
159 // check bundle for directory
160 if (!self.fDIR && ios_get_path_in_bundle(path, &self.fPath)) {
161 self.fDIR = ::opendir(self.fPath.c_str());
162 }
163 #endif
164 self.fSuffix.set(suffix);
165 } else {
166 self.fSuffix.reset();
167 }
168 }
169
170 // returns true if suffix is empty, or if str ends with suffix
issuffixfor(const SkString & suffix,const char str[])171 static bool issuffixfor(const SkString& suffix, const char str[]) {
172 size_t suffixLen = suffix.size();
173 size_t strLen = strlen(str);
174
175 return strLen >= suffixLen &&
176 memcmp(suffix.c_str(), str + strLen - suffixLen, suffixLen) == 0;
177 }
178
next(SkString * name,bool getDir)179 bool SkOSFile::Iter::next(SkString* name, bool getDir) {
180 SkOSFileIterData& self = *reinterpret_cast<SkOSFileIterData*>(fSelf);
181 if (self.fDIR) {
182 dirent* entry;
183
184 while ((entry = ::readdir(self.fDIR)) != nullptr) {
185 struct stat s;
186 SkString str(self.fPath);
187
188 if (!str.endsWith("/") && !str.endsWith("\\")) {
189 str.append("/");
190 }
191 str.append(entry->d_name);
192
193 if (0 == stat(str.c_str(), &s)) {
194 if (getDir) {
195 if (s.st_mode & S_IFDIR) {
196 break;
197 }
198 } else {
199 if (!(s.st_mode & S_IFDIR) && issuffixfor(self.fSuffix, entry->d_name)) {
200 break;
201 }
202 }
203 }
204 }
205 if (entry) { // we broke out with a file
206 if (name) {
207 name->set(entry->d_name);
208 }
209 return true;
210 }
211 }
212 return false;
213 }
214