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Code Issues Releases Wiki Activity

file stream buffering (read)

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XProger
2018-12-11 12:08:56 +03:00
parent 7d78e50750
commit b66e68dbf0
1 changed files with 60 additions and 28 deletions
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82
src/utils.h
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@@ -5,6 +5,8 @@
#include <math.h>
#include <float.h>
//#define TEST_SLOW_FIO
#ifdef _DEBUG
#if defined(_OS_LINUX) || defined(_OS_RPI) || defined(_OS_CLOVER)
#define debugBreak() raise(SIGTRAP);
@@ -1281,6 +1283,8 @@ char cacheDir[255];
char saveDir[255];
char contentDir[255];
#define STREAM_BUFFER_SIZE (8 * 1024)
struct Stream {
typedef void (Callback)(Stream *stream, void *userData);
Callback *callback;
@@ -1289,16 +1293,19 @@ struct Stream {
FILE *f;
char *data;
char *name;
int size, pos;
int size, pos, fpos;
Stream(const char *name, const void *data, int size, Callback *callback = NULL, void *userData = NULL) : callback(callback), userData(userData), f(NULL), data((char*)data), name(NULL), size(size), pos(0) {
char *buffer;
int bufferIndex;
Stream(const char *name, const void *data, int size, Callback *callback = NULL, void *userData = NULL) : callback(callback), userData(userData), f(NULL), data((char*)data), name(NULL), size(size), pos(0), buffer(NULL) {
if (name) {
this->name = new char[strlen(name) + 1];
strcpy(this->name, name);
}
}
Stream(const char *name, Callback *callback = NULL, void *userData = NULL) : callback(callback), userData(userData), f(NULL), data(NULL), name(NULL), size(-1), pos(0) {
Stream(const char *name, Callback *callback = NULL, void *userData = NULL) : callback(callback), userData(userData), f(NULL), data(NULL), name(NULL), size(-1), pos(0), buffer(NULL) {
if (!name && callback) {
callback(NULL, userData);
delete this;
@@ -1336,8 +1343,11 @@ struct Stream {
#endif
} else {
fseek(f, 0, SEEK_END);
size = (int32)ftell(f);
fseek(f, 0, SEEK_SET);
fpos = (int32)ftell(f);
size = fpos;
buffer = new char[STREAM_BUFFER_SIZE];
bufferIndex = -1;
if (name) {
this->name = new char[strlen(name) + 1];
@@ -1351,6 +1361,7 @@ struct Stream {
~Stream() {
delete[] name;
delete[] buffer;
if (f) fclose(f);
}
@@ -1364,9 +1375,7 @@ struct Stream {
static bool exists(const char *name) {
FILE *f = fopen(name, "rb");
if (!f)
return false;
else
if (!f) return false;
fclose(f);
return true;
}
@@ -1379,37 +1388,60 @@ struct Stream {
}
void setPos(int pos) {
if (this->pos != pos) {
this->pos = pos;
if (f) fseek(f, pos, SEEK_SET);
}
}
void seek(int offset) {
if (!offset) return;
if (f) fseek(f, offset, SEEK_CUR);
pos += offset;
}
int raw(void *data, int count) {
if (!count) return 0;
if (f)
count = (int)fread(data, 1, count, f);
else
void raw(void *data, int count) {
if (!count) return;
if (f) {
uint8 *ptr = (uint8*)data;
while (count > 0) {
int bIndex = pos / STREAM_BUFFER_SIZE;
int bPos = pos % STREAM_BUFFER_SIZE;
int delta = min(STREAM_BUFFER_SIZE - bPos, count);
if (bufferIndex != bIndex) {
bufferIndex = bIndex;
if (fpos != bufferIndex * STREAM_BUFFER_SIZE) {
fpos = bufferIndex * STREAM_BUFFER_SIZE;
fseek(f, fpos, SEEK_SET);
#ifdef TEST_SLOW_FIO
LOG("seek %d\n", bufferIndex * STREAM_BUFFER_SIZE);
Sleep(5);
#endif
}
int readed = fread(buffer, 1, min(STREAM_BUFFER_SIZE, size - bufferIndex * STREAM_BUFFER_SIZE), f);
ASSERT(readed > 0);
fpos += readed;
#ifdef TEST_SLOW_FIO
LOG("read %d + %d\n", bufferIndex * STREAM_BUFFER_SIZE, readed);
Sleep(5);
#endif
}
memcpy(ptr, buffer + bPos, delta);
count -= delta;
pos += delta;
ptr += delta;
}
} else {
memcpy(data, this->data + pos, count);
pos += count;
return count;
}
}
template <typename T>
inline T& read(T &x) {
raw(&x, sizeof(x));
/*
if (endian == eBig) {
if (sizeof(T) == 2) x = T(swap16(x));
if (sizeof(T) == 4) x = T(swap32(x));
}
*/
return x;
}