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DS_FileStream.cpp
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274 lines (239 loc) · 4.77 KB
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#include "streams/DS_FileStream.h"
#include "fileUtils/_FindFirst.h"
#ifdef __ANDROID__
#include <android/asset_manager.h>
extern AAssetManager* __assetManager;
#endif
#include "fileUtils/_splitpath.h"
namespace DataStructures
{
//------------------------------------------------------------------- FileStream ------------------------------------------------------------------------
FileStream::FileStream(const char *filePath, const char *mode)
: Stream(), mFile(0), mCanRead(false), mCanWrite(false)
{
strcpy(mFileName, filePath);
mFile = fopen(filePath, mode);
if (mFile)
{
const char *s = mode;
while (s != NULL && *s != '\0')
{
if (*s == 'r')
mCanRead = true;
else
if (*s == 'w')
mCanWrite = true;
++s;
}
}
}
FileStream* FileStream::Create(const char *filePath, const char *mode)
{
FileStream *stream = new FileStream(filePath, mode);
if (!stream->CanSeek())
{
delete stream;
return 0;
}
else
return stream;
}
void FileStream::Close()
{
if (mFile)
fclose(mFile);
mFile = 0;
}
size_t FileStream::Read(void *ptr, size_t size)
{
if (!mFile)
return 0;
size_t res = fread(ptr, 1, size, mFile);
return res;
}
char *FileStream::ReadLine(char *str, int num)
{
if (!mFile)
return 0;
return fgets(str, num, mFile);
}
size_t FileStream::Write(const void *ptr, size_t size)
{
if (!mFile)
return 0;
size_t res = fwrite(ptr, size, 1, mFile);
return res * size;
}
bool FileStream::Eof()
{
if (!mFile || feof(mFile))
return true;
return ((size_t)Position()) >= Length();
}
bool FileStream::SetLength(__s64 size)
{
if (!mFile)
return false;
#ifdef WIN32
int fd = _fileno(mFile);
#else
int fd = fileno(mFile);
#endif
return __chsize(fd, (long int)size) == 0;
}
__s64 FileStream::Seek(__s64 offset, int origin)
{
if (!mFile)
return -1;
if (fseek(mFile, (long int)offset, origin) == 0)
return ftell(mFile);
else
return -1;
}
bool FileStream::Rewind()
{
if (CanSeek())
{
::rewind(mFile);
return true;
}
return false;
}
__u32 FileStream::GetMemoryCost()
{
return Stream::GetMemoryCost() + sizeof(mCanRead) + sizeof(mCanWrite) + sizeof(mFile) + sizeof(*mFile);
}
#ifdef __ANDROID__
FileStreamAndroid::FileStreamAndroid(AAsset* asset)
: mAsset(asset)
{
}
FileStreamAndroid::~FileStreamAndroid()
{
if (mAsset)
close();
}
FileStreamAndroid* FileStreamAndroid::Create(const char *filePath, const char *mode)
{
AAsset* asset = AAssetManager_open(__assetManager, filePath, AASSET_MODE_RANDOM);
if (asset)
{
FileStreamAndroid* stream = new FileStreamAndroid(asset);
return stream;
}
return NULL;
}
bool FileStreamAndroid::CanRead()
{
return true;
}
bool FileStreamAndroid::CanWrite()
{
return false;
}
bool FileStreamAndroid::CanSeek()
{
return true;
}
void FileStreamAndroid::Close()
{
if (mAsset)
AAsset_close(mAsset);
mAsset = NULL;
}
size_t FileStreamAndroid::Read(void* ptr, size_t size, size_t count)
{
int result = AAsset_read(mAsset, ptr, size * count);
return result > 0 ? ((size_t)result) / size : 0;
}
char *FileStreamAndroid::ReadLine(char *str, int num)
{
if (num <= 0)
return NULL;
char c = 0;
size_t maxCharsToRead = num - 1;
for (size_t i = 0; i < maxCharsToRead; ++i)
{
size_t result = read(&c, 1, 1);
if (result != 1)
{
str[i] = '\0';
break;
}
if (c == '\n')
{
str[i] = c;
str[i + 1] = '\0';
break;
}
else if(c == '\r')
{
str[i] = c;
// next may be '\n'
size_t pos = position();
char nextChar = 0;
if (read(&nextChar, 1, 1) != 1)
{
// no more characters
str[i + 1] = '\0';
break;
}
if (nextChar == '\n')
{
if (i == maxCharsToRead - 1)
{
str[i + 1] = '\0';
break;
}
else
{
str[i + 1] = nextChar;
str[i + 2] = '\0';
break;
}
}
else
{
seek(pos, SEEK_SET);
str[i + 1] = '\0';
break;
}
}
str[i] = c;
}
return str; // what if first read failed?
}
size_t FileStreamAndroid::Write(const void* ptr, size_t size, size_t count)
{
return 0;
}
bool FileStreamAndroid::Eof()
{
return Position() >= Length();
}
size_t FileStreamAndroid::Length()
{
return (size_t)AAsset_getLength(mAsset);
}
long int FileStreamAndroid::Position()
{
return AAsset_getLength(mAsset) - AAsset_getRemainingLength(mAsset);
}
bool FileStreamAndroid::Seek(long int offset, int origin)
{
return AAsset_seek(mAsset, offset, origin) != -1;
}
bool FileStreamAndroid::Rewind()
{
if (CanSeek())
{
return AAsset_seek(mAsset, 0, SEEK_SET) != -1;
}
return false;
}
__u32 FileStream::GetMemoryCost()
{
return FileStreamAndroid::GetMemoryCost() + sizeof(mAsset) + sizeof(*mAsset);
}
#endif
}