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Add magic numbers to movie files

This commit is contained in:
Jeffrey Pfau 2014-08-03 20:15:34 -07:00
parent a09bb6d51a
commit fabdfc86f3
1 changed files with 34 additions and 6 deletions
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40
src/gba/gba-rr.c
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@ -3,9 +3,12 @@
#include "gba.h"
#include "util/vfs.h"
#define BINEXT ".dat"
#define METADATA_FILENAME "metadata" BINEXT
#define BINARY_EXT ".dat"
#define BINARY_MAGIC "GBAb"
#define METADATA_FILENAME "metadata" BINARY_EXT
static bool _emitMagic(struct GBARRContext* rr, struct VFile* vf);
static bool _verifyMagic(struct GBARRContext* rr, struct VFile* vf);
static enum GBARRTag _readTag(struct GBARRContext* rr, struct VFile* vf);
static bool _seekTag(struct GBARRContext* rr, struct VFile* vf, enum GBARRTag tag);
static bool _emitTag(struct GBARRContext* rr, struct VFile* vf, uint8_t tag);
@ -68,7 +71,7 @@ bool GBARRLoadStream(struct GBARRContext* rr, uint32_t streamId) {
rr->movieStream = 0;
rr->streamId = streamId;
char buffer[14];
snprintf(buffer, sizeof(buffer), "%u" BINEXT, streamId);
snprintf(buffer, sizeof(buffer), "%u" BINARY_EXT, streamId);
if (GBARRIsRecording(rr)) {
int flags = O_CREAT | O_WRONLY;
if (streamId > rr->maxStreamId) {
@ -80,7 +83,7 @@ bool GBARRLoadStream(struct GBARRContext* rr, uint32_t streamId) {
} else if (GBARRIsPlaying(rr)) {
rr->movieStream = rr->streamDir->openFile(rr->streamDir, buffer, O_RDONLY);
rr->peekedTag = TAG_INVALID;
if (!rr->movieStream || !_seekTag(rr, rr->movieStream, TAG_BEGIN)) {
if (!rr->movieStream || !_verifyMagic(rr, rr->movieStream) || !_seekTag(rr, rr->movieStream, TAG_BEGIN)) {
GBARRStopPlaying(rr);
}
}
@ -104,6 +107,7 @@ bool GBARRIncrementStream(struct GBARRContext* rr) {
if (!GBARRLoadStream(rr, newStreamId)) {
return false;
}
_emitMagic(rr, rr->movieStream);
rr->maxStreamId = newStreamId;
_emitTag(rr, rr->movieStream, TAG_PREVIOUSLY);
rr->movieStream->write(rr->movieStream, &oldStreamId, sizeof(oldStreamId));
@ -120,13 +124,16 @@ bool GBARRStartPlaying(struct GBARRContext* rr, bool autorecord) {
}
char buffer[14];
snprintf(buffer, sizeof(buffer), "%u" BINEXT, rr->streamId);
snprintf(buffer, sizeof(buffer), "%u" BINARY_EXT, rr->streamId);
rr->movieStream = rr->streamDir->openFile(rr->streamDir, buffer, O_RDONLY);
if (!rr->movieStream) {
return false;
}
rr->autorecord = autorecord;
if (!_verifyMagic(rr, rr->movieStream)) {
return false;
}
rr->peekedTag = TAG_INVALID;
_readTag(rr, rr->movieStream); // Discard the buffer
enum GBARRTag tag = _readTag(rr, rr->movieStream);
@ -157,8 +164,12 @@ bool GBARRStartRecording(struct GBARRContext* rr) {
}
char buffer[14];
snprintf(buffer, sizeof(buffer), "%u" BINEXT, rr->streamId);
snprintf(buffer, sizeof(buffer), "%u" BINARY_EXT, rr->streamId);
rr->movieStream = rr->streamDir->openFile(rr->streamDir, buffer, O_TRUNC | O_CREAT | O_WRONLY);
if (!rr->movieStream) {
return false;
}
_emitMagic(rr, rr->movieStream);
if (!_emitTag(rr, rr->movieStream, TAG_BEGIN)) {
rr->movieStream->close(rr->movieStream);
rr->movieStream = 0;
@ -261,6 +272,23 @@ bool GBARRSkipSegment(struct GBARRContext* rr) {
return true;
}
bool _emitMagic(struct GBARRContext* rr, struct VFile* vf) {
UNUSED(rr);
return vf->write(vf, BINARY_MAGIC, 4) == 4;
}
bool _verifyMagic(struct GBARRContext* rr, struct VFile* vf) {
UNUSED(rr);
char buffer[4];
if (vf->read(vf, buffer, sizeof(buffer)) != sizeof(buffer)) {
return false;
}
if (memcmp(buffer, BINARY_MAGIC, sizeof(buffer)) != 0) {
return false;
}
return true;
}
enum GBARRTag _readTag(struct GBARRContext* rr, struct VFile* vf) {
if (!rr || !vf) {
return TAG_EOF;