Apple-2-Tools/NetDisk
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Add basic support for 2img format.

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This commit is contained in:
Stephen Heumann 2018-08-10 19:51:21 -05:00
parent d718d82ff1
commit 2670da4f59
2 changed files with 43 additions and 5 deletions
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28
driver.c
View File

@ -7,8 +7,11 @@
#include "seturl.h"
#include "http.h"
#include "readtcp.h"
#include "asmglue.h"
#include "version.h"
#define TWO_IMG_MAGIC ('2' | 'I'<<8 | (LongWord)'M'<<16 | (LongWord)'G'<<24)
struct DIB dibs[NDIBS] = {0};
struct DIBList dibList = {NDIBS};
@ -47,6 +50,7 @@ void InitDIBs(void) {
#pragma databank 1
Word DriverDispatch(Word callNum, struct GSOSDP *dp) {
Word stateReg = ForceRomIn();
Word retVal = 0;
switch (callNum) {
@ -182,11 +186,24 @@ Word DriverDispatch(Word callNum, struct GSOSDP *dp) {
break;
}
RestoreStateReg(stateReg);
return retVal;
}
#pragma databank 0
static Word CheckTwoImg(Session *sess) {
struct TwoImgHeader *hdr = &sess->fileHeader.twoImgHeader;
if (hdr->twoImgID != TWO_IMG_MAGIC)
return 0;
// TODO more checks
sess->dataOffset = hdr->dataOffset;
return 0;
}
static Word DoMountURL(struct GSOSDP *dp) {
if (dp->dibPointer->extendedDIBPtr != NULL) {
dp->transferCount = 0;
@ -207,20 +224,23 @@ static Word DoMountURL(struct GSOSDP *dp) {
return drvrIOError;
}
enum RequestResult requestResult = DoHTTPRequest(sess, 0, sizeof(sess->fileHeaderBuf) - 1);
enum RequestResult requestResult = DoHTTPRequest(sess, 0, sizeof(sess->fileHeader) - 1);
if (requestResult != REQUEST_SUCCESSFUL) {
// TODO arrange for more detailed error reporting
dp->transferCount = 0;
return drvrIOError;
}
InitReadTCP(sess, sizeof(sess->fileHeaderBuf), &sess->fileHeaderBuf);
InitReadTCP(sess, sizeof(sess->fileHeader.buf), &sess->fileHeader.buf);
while (TryReadTCP(sess) == rsWaiting)
// TODO timeout
/* keep reading */ ;
//TODO detect errors
//TODO detect 2mg
Word checkResult = CheckTwoImg(sess);
if (checkResult != 0) {
// TODO error
}
//TODO report disk switch
@ -237,7 +257,7 @@ static Word DoRead(struct GSOSDP *dp) {
//TODO check size is multiple of a block
//TODO disk-switched logic
unsigned long readStart = dp->blockNum * dp->blockSize;
unsigned long readStart = dp->blockNum * dp->blockSize + sess->dataOffset;
unsigned long readEnd = readStart + dp->requestCount - 1;
enum RequestResult requestResult = DoHTTPRequest(sess, readStart, readEnd);

20
session.h
View File

@ -3,6 +3,18 @@
#include <types.h>
struct TwoImgHeader {
LongWord twoImgID;
LongWord appTag;
Word headerLength;
Word version;
LongWord imgFormat;
LongWord flag;
LongWord nBlocks;
LongWord dataOffset;
LongWord dataLength;
};
typedef struct Session {
/* Marinetti TCP connection status */
Word ipid;
@ -48,8 +60,14 @@ typedef struct Session {
/* Expected length of disk image */
LongWord expectedLength;
/* Offset of disk image blocks within file */
LongWord dataOffset;
/* Buffer for initial bytes of file (which may be a disk image header) */
unsigned char fileHeaderBuf[32];
union {
unsigned char buf[32];
struct TwoImgHeader twoImgHeader;
} fileHeader;
} Session;
#endif