pandory500/SDL-mirror
2
0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

* Android's InputStream::skip is apparently buggy, so instead read into a dummy buffer

Browse source
This commit is contained in:
Tim Angus 2011-10-14 17:29:49 +01:00
parent 116a6faf2f
commit aa76adf490
2 changed files with 11 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/SDL_rwops.h
View file

@ -89,7 +89,6 @@ typedef struct SDL_RWops
void *fileNameRef;
void *inputStream;
void *inputStreamRef;
void *skipMethod;
void *readableByteChannel;
void *readableByteChannelRef;
void *readMethod;

20
src/core/android/SDL_android.cpp
View file

@ -23,6 +23,8 @@
#include "SDL_android.h"
#include <algorithm>
extern "C" {
#include "../../events/SDL_events_c.h"
#include "../../video/android/SDL_androidkeyboard.h"
@ -346,11 +348,6 @@ static int Android_JNI_FileOpen(SDL_RWops* ctx)
ctx->hidden.androidio.inputStream = inputStream;
ctx->hidden.androidio.inputStreamRef = mEnv->NewGlobalRef(inputStream);
// Store .skip id for seeking purposes
mid = mEnv->GetMethodID(mEnv->GetObjectClass(inputStream),
"skip", "(J)J");
ctx->hidden.androidio.skipMethod = mid;
// Despite all the visible documentation on [Asset]InputStream claiming
// that the .available() method is not guaranteed to return the entire file
// size, comments in <sdk>/samples/<ver>/ApiDemos/src/com/example/ ...
@ -518,16 +515,21 @@ extern "C" long Android_JNI_FileSeek(SDL_RWops* ctx, long offset, int whence)
long movement = newPosition - ctx->hidden.androidio.position;
jobject inputStream = (jobject)ctx->hidden.androidio.inputStream;
jmethodID skipMethod = (jmethodID)ctx->hidden.androidio.skipMethod;
if (movement > 0) {
unsigned char buffer[1024];
// The easy case where we're seeking forwards
while (movement > 0) {
// inputStream.skip(...);
movement -= mEnv->CallLongMethod(inputStream, skipMethod, movement);
if (Android_JNI_ExceptionOccurred()) {
size_t result = Android_JNI_FileRead(ctx, buffer, 1,
std::min(movement, (long)sizeof(buffer)));
if (result <= 0) {
// Failed to read/skip the required amount, so fail
return -1;
}
movement -= result;
}
} else if (movement < 0) {
// We can't seek backwards so we have to reopen the file and seek