ciderpress/diskimg/TwoImg.cpp

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/*
* CiderPress
* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
* See the file LICENSE for distribution terms.
*/
/*
* Support for 2MG/2IMG wrapper files.
*
* This needs to be directly accessible from external applications, so try not
* to hook into private DiskImg state.
*/
#include "StdAfx.h"
#include "TwoImg.h"
#include "DiskImgPriv.h"
///*static*/ const char* TwoImgHeader::kMagic = "2IMG"; // file magic #
///*static*/ const char* TwoImgHeader::kCreator = "CdrP"; // our "creator" ID
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/*
* Initialize a header to default values, using the supplied image length
* where appropriate.
*
* Sets up a header for a 2MG file with the disk data and nothing else.
*
* Returns 0 on success, -1 if one of the arguments was bad.
*/
int TwoImgHeader::InitHeader(int imageFormat, uint32_t imageSize,
uint32_t imageBlockCount)
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{
if (imageSize == 0)
return -1;
if (imageFormat < kImageFormatDOS || imageFormat > (int) kImageFormatNibble)
return -1;
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if (imageFormat != kImageFormatNibble &&
imageSize != imageBlockCount * 512)
{
LOGW("2MG InitHeader: bad sizes %d %u %u", imageFormat,
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imageSize, imageBlockCount);
return -1;
}
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assert(fComment == NULL);
//memcpy(fMagic, kMagic, 4);
//memcpy(fCreator, kCreator, 4);
fMagic = kMagic;
fCreator = kCreatorCiderPress;
fHeaderLen = kOurHeaderLen;
fVersion = kOurVersion;
fImageFormat = imageFormat;
fFlags = 0;
fNumBlocks = imageBlockCount;
fDataOffset = kOurHeaderLen;
fDataLen = imageSize;
fCmtOffset = 0;
fCmtLen = 0;
fCreatorOffset = 0;
fCreatorLen = 0;
fSpare[0] = fSpare[1] = fSpare[2] = fSpare[3] = 0;
return 0;
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}
/*
* Get the DOS volume number.
*
* If not set, we currently return the initial value (-1), rather than the
* default volume number. For the way we currently make use of this, this
* makes the most sense.
*/
int16_t TwoImgHeader::GetDOSVolumeNum(void) const
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{
assert(fFlags & kDOSVolumeSet);
return fDOSVolumeNum;
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}
/*
* Set the DOS volume number.
*/
void TwoImgHeader::SetDOSVolumeNum(short dosVolumeNum)
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{
assert(dosVolumeNum >= 0 && dosVolumeNum < 256);
fFlags |= dosVolumeNum;
fFlags |= kDOSVolumeSet;
}
/*
* Set the comment.
*/
void TwoImgHeader::SetComment(const char* comment)
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{
delete[] fComment;
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if (comment == NULL) {
fComment = NULL;
} else {
fComment = new char[strlen(comment)+1];
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if (fComment != NULL)
strcpy(fComment, comment);
// else throw alloc failure
}
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if (fComment == NULL) {
fCmtLen = 0;
fCmtOffset = 0;
if (fCreatorOffset > 0)
fCreatorOffset = fDataOffset + fDataLen;
} else {
fCmtLen = strlen(fComment);
fCmtOffset = fDataOffset + fDataLen;
if (fCreatorOffset > 0)
fCreatorOffset = fCmtOffset + fCmtLen;
}
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}
/*
* Set the creator chunk.
*/
void TwoImgHeader::SetCreatorChunk(const void* chunk, long len)
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{
assert(len >= 0);
delete[] fCreatorChunk;
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if (chunk == NULL || len == 0) {
fCreatorChunk = NULL;
} else {
fCreatorChunk = new char[len];
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if (fCreatorChunk != NULL)
memcpy(fCreatorChunk, chunk, len);
// else throw alloc failure
}
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if (fCreatorChunk == NULL) {
fCreatorLen = 0;
fCreatorOffset = 0;
} else {
fCreatorLen = len;
if (fCmtOffset > 0)
fCreatorOffset = fCmtOffset + fCmtLen;
else
fCreatorOffset = fDataOffset + fDataLen;
}
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}
/*
* Read the header from a 2IMG file. Pass in "totalLength" as a sanity check.
*
* THOUGHT: provide a simple GenericFD conversion for FILE*, and then just
* call the GenericFD version of ReadHeader.
*
* Returns 0 on success, nonzero on error or invalid header.
*/
int TwoImgHeader::ReadHeader(FILE* fp, uint32_t totalLength)
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{
uint8_t buf[kOurHeaderLen];
fread(buf, kOurHeaderLen, 1, fp);
if (ferror(fp))
return errno ? errno : -1;
if (UnpackHeader(buf, totalLength) != 0)
return -1;
/*
* Extract the comment, if any.
*/
if (fCmtOffset > 0 && fCmtLen > 0) {
if (GetChunk(fp, fCmtOffset - kOurHeaderLen, fCmtLen,
(void**) &fComment) != 0)
{
LOGI("Throwing comment away");
fCmtLen = 0;
fCmtOffset = 0;
} else {
LOGI("Got comment: '%s'", fComment);
}
}
/*
* Extract the creator chunk, if any.
*/
if (fCreatorOffset > 0 && fCreatorLen > 0) {
if (GetChunk(fp, fCreatorOffset - kOurHeaderLen, fCreatorLen,
(void**) &fCreatorChunk) != 0)
{
LOGI("Throwing creator chunk away");
fCreatorLen = 0;
fCreatorOffset = 0;
} else {
//LOGI("Got creator chunk: '%s'", fCreatorChunk);
}
}
return 0;
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}
/*
* Read the header from a 2IMG file. Pass in "totalLength" as a sanity check.
*
* Returns 0 on success, nonzero on error or invalid header.
*/
int TwoImgHeader::ReadHeader(GenericFD* pGFD, uint32_t totalLength)
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{
DIError dierr;
uint8_t buf[kOurHeaderLen];
dierr = pGFD->Read(buf, kOurHeaderLen);
if (dierr != kDIErrNone)
return -1;
if (UnpackHeader(buf, totalLength) != 0)
return -1;
/*
* Extract the comment, if any.
*/
if (fCmtOffset > 0 && fCmtLen > 0) {
if (GetChunk(pGFD, fCmtOffset - kOurHeaderLen, fCmtLen,
(void**) &fComment) != 0)
{
LOGI("Throwing comment away");
fCmtLen = 0;
fCmtOffset = 0;
} else {
LOGI("Got comment: '%s'", fComment);
}
}
/*
* Extract the creator chunk, if any.
*/
if (fCreatorOffset > 0 && fCreatorLen > 0) {
if (GetChunk(pGFD, fCreatorOffset - kOurHeaderLen, fCreatorLen,
(void**) &fCreatorChunk) != 0)
{
LOGI("Throwing creator chunk away");
fCreatorLen = 0;
fCreatorOffset = 0;
} else {
//LOGI("Got creator chunk: '%s'", fCreatorChunk);
}
}
return 0;
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}
/*
* Grab a chunk of data from a relative offset.
*/
int TwoImgHeader::GetChunk(GenericFD* pGFD, di_off_t relOffset, long len,
void** pBuf)
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{
DIError dierr;
di_off_t curPos;
/* remember current offset */
curPos = pGFD->Tell();
/* seek out to chunk and grab it */
dierr = pGFD->Seek(relOffset, kSeekCur);
if (dierr != kDIErrNone) {
LOGI("2MG seek to chunk failed");
return -1;
}
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assert(*pBuf == NULL);
*pBuf = new char[len+1]; // one extra, for null termination
dierr = pGFD->Read(*pBuf, len);
if (dierr != kDIErrNone) {
LOGI("2MG chunk read failed");
delete[] (char*) (*pBuf);
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*pBuf = NULL;
(void) pGFD->Seek(curPos, kSeekSet);
return -1;
}
/* null-terminate, in case this was a string */
((char*) *pBuf)[len] = '\0';
/* seek back to where we were */
(void) pGFD->Seek(curPos, kSeekSet);
return 0;
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}
/*
* Grab a chunk of data from a relative offset.
*/
int TwoImgHeader::GetChunk(FILE* fp, di_off_t relOffset, long len,
void** pBuf)
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{
long curPos;
int count;
/* remember current offset */
curPos = ftell(fp);
LOGI("Current offset=%ld", curPos);
/* seek out to chunk and grab it */
if (fseek(fp, (long) relOffset, SEEK_CUR) == -1) {
LOGI("2MG seek to chunk failed");
return errno ? errno : -1;;
}
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assert(*pBuf == NULL);
*pBuf = new char[len+1]; // one extra, for null termination
count = fread(*pBuf, len, 1, fp);
if (!count || ferror(fp) || feof(fp)) {
LOGI("2MG chunk read failed");
delete[] (char*) (*pBuf);
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*pBuf = NULL;
(void) fseek(fp, curPos, SEEK_SET);
clearerr(fp);
return errno ? errno : -1;;
}
/* null-terminate, in case this was a string */
((char*) *pBuf)[len] = '\0';
/* seek back to where we were */
(void) fseek(fp, curPos, SEEK_SET);
return 0;
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}
/*
* Unpack the 64-byte 2MG header.
*
* Performs some sanity checks. Returns 0 on success, -1 on failure.
*/
int TwoImgHeader::UnpackHeader(const uint8_t* buf, uint32_t totalLength)
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{
fMagic = GetLongBE(&buf[0x00]);
fCreator = GetLongBE(&buf[0x04]);
fHeaderLen = GetShortLE(&buf[0x08]);
fVersion = GetShortLE(&buf[0x0a]);
fImageFormat = GetLongLE(&buf[0x0c]);
fFlags = GetLongLE(&buf[0x10]);
fNumBlocks = GetLongLE(&buf[0x14]);
fDataOffset = GetLongLE(&buf[0x18]);
fDataLen = GetLongLE(&buf[0x1c]);
fCmtOffset = GetLongLE(&buf[0x20]);
fCmtLen = GetLongLE(&buf[0x24]);
fCreatorOffset = GetLongLE(&buf[0x28]);
fCreatorLen = GetLongLE(&buf[0x2c]);
fSpare[0] = GetLongLE(&buf[0x30]);
fSpare[1] = GetLongLE(&buf[0x34]);
fSpare[2] = GetLongLE(&buf[0x38]);
fSpare[3] = GetLongLE(&buf[0x3c]);
fMagicStr[0] = (char) (fMagic >> 24);
fMagicStr[1] = (char) (fMagic >> 16);
fMagicStr[2] = (char) (fMagic >> 8);
fMagicStr[3] = (char) fMagic;
fMagicStr[4] = '\0';
fCreatorStr[0] = (char) (fCreator >> 24);
fCreatorStr[1] = (char) (fCreator >> 16);
fCreatorStr[2] = (char) (fCreator >> 8);
fCreatorStr[3] = (char) fCreator;
fCreatorStr[4] = '\0';
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if (fMagic != kMagic) {
LOGI("Magic number does not match 2IMG");
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return -1;
}
if (fVersion > 1) {
LOGW("ERROR: unsupported version=%d", fVersion);
return -1; // bad header until I hear otherwise
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}
if (fFlags & kDOSVolumeSet)
fDOSVolumeNum = fFlags & kDOSVolumeMask;
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DumpHeader();
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/* fix broken 'WOOF' images from Sweet-16 */
if (fCreator == kCreatorSweet16 && fDataLen == 0 &&
fImageFormat != kImageFormatNibble)
{
fDataLen = fNumBlocks * kBlockSize;
LOGI("NOTE: fixing zero dataLen in 'WOOF' image (set to %u)",
fDataLen);
}
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/*
* Perform some sanity checks.
*/
if (fImageFormat != kImageFormatNibble &&
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fNumBlocks * kBlockSize != fDataLen)
{
LOGW("numBlocks/dataLen mismatch (%u vs %u)",
fNumBlocks * kBlockSize, fDataLen);
return -1;
}
if (fDataLen + fDataOffset > totalLength) {
LOGW("Invalid dataLen/offset/fileLength (dl=%u, off=%u, tlen=%u)",
fDataLen, fDataOffset, totalLength);
return -1;
}
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if (fImageFormat < kImageFormatDOS || fImageFormat > kImageFormatNibble) {
LOGW("Invalid image format %u", fImageFormat);
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return -1;
}
if (fCmtOffset > 0 && fCmtOffset < fDataOffset + fDataLen) {
LOGW("2MG comment is inside the data section (off=%u, data end=%u)",
fCmtOffset, fDataOffset+fDataLen);
DebugBreak();
// ignore the comment
fCmtOffset = 0;
fCmtLen = 0;
}
if (fCreatorOffset > 0 && fCreatorLen > 0) {
uint32_t prevEnd = fDataOffset + fDataLen + fCmtLen;
if (fCreatorOffset < prevEnd) {
LOGW("2MG creator chunk is inside prev data (off=%u, data end=%u)",
fCreatorOffset, prevEnd);
DebugBreak();
// ignore the creator chunk
fCreatorOffset = 0;
fCreatorLen = 0;
}
}
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return 0;
}
/*
* Write the header to a 2IMG file.
*
* Returns 0 on success, or an errno value on failure.
*/
int
TwoImgHeader::WriteHeader(FILE* fp) const
{
uint8_t buf[kOurHeaderLen];
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PackHeader(buf);
if (fwrite(buf, kOurHeaderLen, 1, fp) != 1)
return errno ? errno : -1;
return 0;
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}
/*
* Write the header to a 2IMG file.
*
* Returns 0 on success, or an errno value on failure.
*/
int
TwoImgHeader::WriteHeader(GenericFD* pGFD) const
{
uint8_t buf[kOurHeaderLen];
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PackHeader(buf);
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if (pGFD->Write(buf, kOurHeaderLen) != kDIErrNone)
return -1;
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return 0;
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}
/*
* Write the footer. File must be seeked to end of data chunk.
*/
int
TwoImgHeader::WriteFooter(FILE* fp) const
{
LOGI("Writing footer at offset=%ld", (long) ftell(fp));
if (fCmtLen) {
fwrite(fComment, fCmtLen, 1, fp);
}
if (fCreatorLen) {
fwrite(fCreatorChunk, fCreatorLen, 1, fp);
}
if (ferror(fp))
return errno ? errno : -1;
return 0;
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}
/*
* Write the footer. File must be seeked to end of data chunk.
*/
int
TwoImgHeader::WriteFooter(GenericFD* pGFD) const
{
LOGI("Writing footer at offset=%ld", (long) pGFD->Tell());
if (fCmtLen) {
if (pGFD->Write(fComment, fCmtLen) != kDIErrNone)
return -1;
}
if (fCreatorLen) {
if (pGFD->Write(fCreatorChunk, fCreatorLen) != kDIErrNone)
return -1;
}
return 0;
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}
/*
* Pack the header values into a 64-byte buffer.
*/
void
TwoImgHeader::PackHeader(uint8_t* buf) const
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{
if (fCmtLen > 0 && fCmtOffset == 0) {
assert(false);
}
if (fCreatorLen > 0 && fCreatorOffset == 0) {
assert(false);
}
PutLongBE(&buf[0x00], fMagic);
PutLongBE(&buf[0x04], fCreator);
PutShortLE(&buf[0x08], fHeaderLen);
PutShortLE(&buf[0x0a], fVersion);
PutLongLE(&buf[0x0c], fImageFormat);
PutLongLE(&buf[0x10], fFlags);
PutLongLE(&buf[0x14], fNumBlocks);
PutLongLE(&buf[0x18], fDataOffset);
PutLongLE(&buf[0x1c], fDataLen);
PutLongLE(&buf[0x20], fCmtOffset);
PutLongLE(&buf[0x24], fCmtLen);
PutLongLE(&buf[0x28], fCreatorOffset);
PutLongLE(&buf[0x2c], fCreatorLen);
PutLongLE(&buf[0x30], fSpare[0]);
PutLongLE(&buf[0x34], fSpare[1]);
PutLongLE(&buf[0x38], fSpare[2]);
PutLongLE(&buf[0x3c], fSpare[3]);
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}
/*
* Dump the contents of an ImgHeader.
*/
void
TwoImgHeader::DumpHeader(void) const
{
LOGI("--- header contents:");
LOGI("\tmagic = '%s' (0x%08x)", fMagicStr, fMagic);
LOGI("\tcreator = '%s' (0x%08x)", fCreatorStr, fCreator);
LOGI("\theaderLen = %u", fHeaderLen);
LOGI("\tversion = %u", fVersion);
LOGI("\timageFormat = %u", fImageFormat);
LOGI("\tflags = 0x%08x", fFlags);
LOGI("\t locked = %s",
(fFlags & kFlagLocked) ? "true" : "false");
LOGI("\t DOS volume = %s (%d)",
(fFlags & kDOSVolumeSet) ? "true" : "false",
fFlags & kDOSVolumeMask);
LOGI("\tnumBlocks = %u", fNumBlocks);
LOGI("\tdataOffset = %u", fDataOffset);
LOGI("\tdataLen = %u", fDataLen);
LOGI("\tcmtOffset = %u", fCmtOffset);
LOGI("\tcmtLen = %u", fCmtLen);
LOGI("\tcreatorOffset = %u", fCreatorOffset);
LOGI("\tcreatorLen = %u", fCreatorLen);
LOGI("---");
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}