SkOSFile_posix.cpp File Reference

#include "include/core/SkString.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkTFitsIn.h"
#include "include/private/base/SkTemplates.h"
#include "src/core/SkOSFile.h"
#include <dirent.h>
#include <new>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

Go to the source code of this file.

Classes
struct	SkFILEID
struct	SkOSFileIterData

Functions
void	sk_fsync (FILE *f)
bool	sk_exists (const char *path, SkFILE_Flags flags)
static bool	sk_ino (FILE *a, SkFILEID *id)
bool	sk_fidentical (FILE *a, FILE *b)
void	sk_fmunmap (const void *addr, size_t length)
void *	sk_fdmmap (int fd, size_t *size)
int	sk_fileno (FILE *f)
void *	sk_fmmap (FILE *f, size_t *size)
size_t	sk_qread (FILE *file, void *buffer, size_t count, size_t offset)
static bool	issuffixfor (const SkString &suffix, const char str[])

Function Documentation

issuffixfor()

static bool issuffixfor ( const SkString &  suffix, const char  str[]  )

static

Definition at line 178 of file SkOSFile_posix.cpp.

                                                                  {
    size_t  suffixLen = suffix.size();
    size_t  strLen = strlen(str);
 
    return  strLen >= suffixLen &&
            memcmp(suffix.c_str(), str + strLen - suffixLen, suffixLen) == 0;
}

sk_exists()

bool sk_exists	(	const char *	path,
		SkFILE_Flags	flags = (SkFILE_Flags) 0
	)

Returns true if something (file, directory, ???) exists at this path, and has the specified access flags.

Definition at line 34 of file SkOSFile_posix.cpp.

                                                     {
    int mode = F_OK;
    if (flags & kRead_SkFILE_Flag) {
        mode |= R_OK;
    }
    if (flags & kWrite_SkFILE_Flag) {
        mode |= W_OK;
    }
#ifdef SK_BUILD_FOR_IOS
    // if the default path fails, check the bundle (but only if read-only)
    if (0 == access(path, mode)) {
        return true;
    } else {
        return (kRead_SkFILE_Flag == flags && ios_get_path_in_bundle(path, nullptr));
    }
#else
    return (0 == access(path, mode));
#endif
}

sk_fdmmap()

void * sk_fdmmap	(	int	fd,
		size_t *	length
	)

Maps a file descriptor into memory. Returns the address and length on success, NULL otherwise. The mapping is read only. When finished with the mapping, free the returned pointer with sk_fmunmap.

Definition at line 84 of file SkOSFile_posix.cpp.

                                      {
    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;
}

sk_fidentical()

bool sk_fidentical	(	FILE *	a,
		FILE *	b
	)

Returns true if the two point at the exact same filesystem object.

Definition at line 73 of file SkOSFile_posix.cpp.

                                     {
    SkFILEID aID, bID;
    return sk_ino(a, &aID) && sk_ino(b, &bID)
           && aID.ino == bID.ino
           && aID.dev == bID.dev;
}

sk_fileno()

int sk_fileno

(

FILE *

f

)

Returns the underlying file descriptor for the given file. The return value will be < 0 on failure.

Definition at line 106 of file SkOSFile_posix.cpp.

                       {
    return fileno(f);
}

sk_fmmap()

void * sk_fmmap	(	FILE *	f,
		size_t *	length
	)

Maps a file into memory. Returns the address and length on success, NULL otherwise. The mapping is read only. When finished with the mapping, free the returned pointer with sk_fmunmap.

Definition at line 110 of file SkOSFile_posix.cpp.

                                      {
    int fd = sk_fileno(f);
    if (fd < 0) {
        return nullptr;
    }
 
    return sk_fdmmap(fd, size);
}

sk_fmunmap()

void sk_fmunmap	(	const void *	addr,
		size_t	length
	)

Unmaps a file previously mapped by sk_fmmap or sk_fdmmap. The length parameter must be the same as returned from sk_fmmap.

Definition at line 80 of file SkOSFile_posix.cpp.

                                                 {
    munmap(const_cast<void*>(addr), length);
}

sk_fsync()

void sk_fsync

(

FILE *

f

)

Definition at line 27 of file SkOSFile_posix.cpp.

                       {
#if !defined(SK_BUILD_FOR_ANDROID) && !defined(__UCLIBC__) && !defined(_NEWLIB_VERSION)
    int fd = fileno(f);
    fsync(fd);
#endif
}

sk_ino()

static bool sk_ino ( FILE *  a, SkFILEID *  id  )

static

Definition at line 59 of file SkOSFile_posix.cpp.

                                          {
    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;
}

sk_qread()

size_t sk_qread	(	FILE *	file,
		void *	buffer,
		size_t	count,
		size_t	offset
	)

Definition at line 119 of file SkOSFile_posix.cpp.

                                                                       {
    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;
}