/*
* Extract and verify the header of a resource fork.
*/
/*static*/ bool
ReformatResourceFork::ReadHeader(const uint8_t* srcBuf, long srcLen,
long* pFileVersion, long* pFileToMap, long* pFileMapSize,
bool* pLittleEndian)
{
if (srcLen < 128) {
LOGI("ReformatResource: invalid len %d", srcLen);
return false;
}
*pFileVersion = Get32LE(srcBuf);
if (*pFileVersion == 0)
*pLittleEndian = true;
else
*pLittleEndian = false;
*pFileVersion = Get32(srcBuf, *pLittleEndian);
*pFileToMap = Get32(srcBuf+4, *pLittleEndian);
*pFileMapSize = Get32(srcBuf+8, *pLittleEndian);
if (*pFileVersion != 0)
return false;
if (*pFileMapSize <= 0 || *pFileMapSize >= srcLen ||
*pFileToMap <= 0 || *pFileToMap >= srcLen)
{
return false;
}
return true;
}
/*
* Print the contents of the text blocks.
*
* We're assured that the text block format is correct because we had to
* skip through them earlier. We don't really need to worry about running
* off the end due to a bad file.
*/
const uint8_t* ReformatAWGS_WP::FindTextBlock(const Chunk* pChunk, int blockNum)
{
const uint8_t* blockPtr = pChunk->textBlocks;
uint32_t blockSize;
while (blockNum--) {
blockSize = Get32LE(blockPtr);
blockPtr += 4 + blockSize;
}
return blockPtr;
}
/*
* Skip past a series of text blocks.
*
* Returns "true" on success, "false" on failure.
*/
bool ReformatAWGS_WP::SkipTextBlocks(const uint8_t** pSrcBuf,
long* pSrcLen, int textBlockCount)
{
uint32_t blockSize;
const uint8_t* srcBuf = *pSrcBuf;
long srcLen = *pSrcLen;
LOGI("Scanning %d text blocks", textBlockCount);
if (srcLen < 4)
return false;
while (textBlockCount--) {
blockSize = Get32LE(srcBuf);
srcBuf += 4;
srcLen -= 4;
LOGI("+++ blockSize=%lu srcLen=%ld", blockSize, srcLen);
if ((long) blockSize < kMinTextBlockSize) {
LOGI("Block size too small (%d - %d)",
blockSize, Get16LE(srcBuf));
return false;
}
if ((long) blockSize > srcLen) {
LOGI("Ran off the end in doc text blocks");
return false;
}
if (Get16LE(srcBuf) != blockSize || Get16LE(srcBuf+2) != blockSize) {
LOGI("AWGS WARNING: inconsistent block size values (%ld vs %d/%d)",
blockSize, Get16LE(srcBuf), Get16LE(srcBuf+2));
/* okay to ignore it, so long as everything else works out */
}
srcBuf += blockSize;
srcLen -= blockSize;
}
*pSrcBuf = srcBuf;
*pSrcLen = srcLen;
return true;
}
/*
* Output a single chunk. We do this by walking down the saveArray.
*/
void ReformatAWGS_WP::PrintChunk(const Chunk* pChunk)
{
const int kDefaultStatusBits = kAWGSJustifyLeft | kAWGSSingleSpace;
SaveArrayEntry sae;
const uint8_t* saveArray;
int saCount;
const uint8_t* blockPtr;
long blockLen;
const uint8_t* pRuler;
uint16_t rulerStatusBits;
saveArray = pChunk->saveArray;
saCount = pChunk->saveArrayCount;
for ( ; saCount > 0; saCount--, saveArray += kSaveArrayEntryLen) {
UnpackSaveArrayEntry(saveArray, &sae);
/*
* Page-break paragraphs have no real data and an invalid value
* in the "rulerNum" field. So we just throw out a page break
* here and call it a day.
*/
if (sae.attributes == 0x0001) {
/* this is a page-break paragraph */
RTFSetColor(kColorMediumBlue);
RTFSetFont(kFontCourierNew);
RTFSetFontSize(10);
BufPrintf("<page-break>");
RTFSetColor(kColorNone);
RTFNewPara();
RTFPageBreak(); // only supported by Word
continue;
}
if (sae.rulerNum < pChunk->numRulers) {
pRuler = pChunk->rulers + sae.rulerNum * kRulerEntryLen;
rulerStatusBits = Get16LE(pRuler + 2);
} else {
LOGI("AWGS_WP GLITCH: invalid ruler index %d", sae.rulerNum);
rulerStatusBits = kDefaultStatusBits;
}
if (rulerStatusBits & kAWGSJustifyFull)
RTFParaJustify();
else if (rulerStatusBits & kAWGSJustifyRight)
RTFParaRight();
else if (rulerStatusBits & kAWGSJustifyCenter)
RTFParaCenter();
else if (rulerStatusBits & kAWGSJustifyLeft)
RTFParaLeft();
RTFSetPara();
/*
* Find the text block that holds this paragraph. We could speed
* this up by creating an array of entries rather than walking the
* list every time. However, the block count tends to be fairly
* small (e.g. 7 for a 16K doc).
*/
blockPtr = FindTextBlock(pChunk, sae.textBlock);
if (blockPtr == NULL) {
LOGI("AWGS_WP bad textBlock %d", sae.textBlock);
return;
}
blockLen = (long) Get32LE(blockPtr);
if (blockLen <= 0 || blockLen > 65535) {
LOGI("AWGS_WP invalid block len %d", blockLen);
return;
}
blockPtr += 4;
if (sae.offset >= blockLen) {
LOGI("AWGS_WP bad offset: %d, blockLen=%ld",
sae.offset, blockLen);
return;
}
PrintParagraph(blockPtr + sae.offset, blockLen - sae.offset);
}
}