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VFS: Optimize expanding in-memory files

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This commit is contained in:
Vicki Pfau 2017-04-16 22:39:50 -07:00
parent 5665ac0316
commit fbb02475da
2 changed files with 20 additions and 10 deletions
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1
CHANGES
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@ -103,6 +103,7 @@ Misc:
- Feature: Make -l option explicit
- Core: Ability to enumerate and modify video and audio channels
- Debugger: Make attaching a backend idempotent
- VFS: Optimize expanding in-memory files
0.5.2: (2016-12-31)
Bugfixes:

29
src/util/vfs/vfs-mem.c
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@ -4,12 +4,14 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <mgba-util/vfs.h>
#include <mgba-util/math.h>
#include <mgba-util/memory.h>
struct VFileMem {
struct VFile d;
void* mem;
size_t size;
size_t bufferSize;
size_t offset;
};
@ -40,6 +42,7 @@ struct VFile* VFileFromMemory(void* mem, size_t size) {
vfm->mem = mem;
vfm->size = size;
vfm->bufferSize = size;
vfm->offset = 0;
vfm->d.close = _vfmClose;
vfm->d.seek = _vfmSeek;
@ -67,6 +70,7 @@ struct VFile* VFileFromConstMemory(const void* mem, size_t size) {
vfm->mem = (void*) mem;
vfm->size = size;
vfm->bufferSize = size;
vfm->offset = 0;
vfm->d.close = _vfmClose;
vfm->d.seek = _vfmSeek;
@ -89,8 +93,9 @@ struct VFile* VFileMemChunk(const void* mem, size_t size) {
}
vfm->size = size;
vfm->bufferSize = toPow2(size);
if (size) {
vfm->mem = anonymousMemoryMap(size);
vfm->mem = anonymousMemoryMap(vfm->bufferSize);
if (mem) {
memcpy(vfm->mem, mem, size);
}
@ -113,15 +118,19 @@ struct VFile* VFileMemChunk(const void* mem, size_t size) {
}
void _vfmExpand(struct VFileMem* vfm, size_t newSize) {
void* oldBuf = vfm->mem;
vfm->mem = anonymousMemoryMap(newSize);
if (oldBuf) {
if (newSize < vfm->size) {
memcpy(vfm->mem, oldBuf, newSize);
} else {
memcpy(vfm->mem, oldBuf, vfm->size);
size_t alignedSize = toPow2(newSize);
if (alignedSize > vfm->bufferSize) {
void* oldBuf = vfm->mem;
vfm->mem = anonymousMemoryMap(alignedSize);
if (oldBuf) {
if (newSize < vfm->size) {
memcpy(vfm->mem, oldBuf, newSize);
} else {
memcpy(vfm->mem, oldBuf, vfm->size);
}
mappedMemoryFree(oldBuf, vfm->bufferSize);
}
mappedMemoryFree(oldBuf, vfm->size);
vfm->bufferSize = alignedSize;
}
vfm->size = newSize;
}
@ -135,7 +144,7 @@ bool _vfmClose(struct VFile* vf) {
bool _vfmCloseFree(struct VFile* vf) {
struct VFileMem* vfm = (struct VFileMem*) vf;
mappedMemoryFree(vfm->mem, vfm->size);
mappedMemoryFree(vfm->mem, vfm->bufferSize);
vfm->mem = 0;
free(vfm);
return true;