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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* 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 "nscore.h"
#include "nsIFile.h"
#include "nsImportScanFile.h"
#include "ImportCharSet.h"
nsImportScanFile::nsImportScanFile()
{
m_allocated = false;
m_eof = false;
m_pBuf = nullptr;
}
nsImportScanFile::~nsImportScanFile()
{
if (m_allocated)
CleanUpScan();
}
void nsImportScanFile::InitScan(nsIInputStream *pInputStream, uint8_t * pBuf, uint32_t sz)
{
m_pInputStream = pInputStream;
m_pBuf = pBuf;
m_bufSz = sz;
m_bytesInBuf = 0;
m_pos = 0;
}
void nsImportScanFile::CleanUpScan(void)
{
m_pInputStream = nullptr;
if (m_allocated) {
delete [] m_pBuf;
m_pBuf = NULL;
}
}
void nsImportScanFile::ShiftBuffer(void)
{
uint8_t * pTop;
uint8_t * pCurrent;
if (m_pos < m_bytesInBuf) {
pTop = m_pBuf;
pCurrent = pTop + m_pos;
uint32_t cnt = m_bytesInBuf - m_pos;
while (cnt) {
*pTop = *pCurrent;
pTop++; pCurrent++;
cnt--;
}
}
m_bytesInBuf -= m_pos;
m_pos = 0;
}
bool nsImportScanFile::FillBufferFromFile(void)
{
uint64_t available;
nsresult rv = m_pInputStream->Available(&available);
if (NS_FAILED(rv))
return false;
// Fill up a buffer and scan it
ShiftBuffer();
// Read in some more bytes
uint32_t cnt = m_bufSz - m_bytesInBuf;
// To distinguish from disk errors
// Check first for end of file?
// Set a done flag if true...
uint32_t read;
char *pBuf = (char *)m_pBuf;
pBuf += m_bytesInBuf;
rv = m_pInputStream->Read(pBuf, (int32_t) cnt, &read);
if (NS_FAILED(rv))
return false;
rv = m_pInputStream->Available(&available);
if (NS_FAILED(rv))
m_eof = true;
m_bytesInBuf += cnt;
return true;
}
bool nsImportScanFile::Scan(bool *pDone)
{
uint64_t available;
nsresult rv = m_pInputStream->Available(&available);
if (NS_FAILED(rv))
{
if (m_pos < m_bytesInBuf)
ScanBuffer(pDone);
*pDone = true;
return true;
}
// Fill up a buffer and scan it
if (!FillBufferFromFile())
return false;
return ScanBuffer(pDone);
}
bool nsImportScanFile::ScanBuffer(bool *)
{
return true;
}
bool nsImportScanFileLines::ScanBuffer(bool *pDone)
{
// m_pos, m_bytesInBuf, m_eof, m_pBuf are relevant
uint32_t pos = m_pos;
uint32_t max = m_bytesInBuf;
uint8_t * pChar = m_pBuf + pos;
uint32_t startPos;
while (pos < max) {
if (m_needEol) {
// Find the next eol...
while ((pos < max) && (*pChar != ImportCharSet::cCRChar) && (*pChar != ImportCharSet::cLinefeedChar)) {
pos++;
pChar++;
}
m_pos = pos;
if (pos < max)
m_needEol = false;
if (pos == max) // need more buffer for an end of line
break;
}
// Skip past any eol characters
while ((pos < max) && ((*pChar == ImportCharSet::cCRChar) || (*pChar == ImportCharSet::cLinefeedChar))) {
pos++;
pChar++;
}
m_pos = pos;
if (pos == max)
break;
// Make sure we can find either the eof or the
// next end of line
startPos = pos;
while ((pos < max) && (*pChar != ImportCharSet::cCRChar) && (*pChar != ImportCharSet::cLinefeedChar)) {
pos++;
pChar++;
}
// Is line too big for our buffer?
if ((pos == max) && !m_eof) {
if (!m_pos) { // line too big for our buffer
m_pos = pos;
m_needEol = true;
}
break;
}
if (!ProcessLine(m_pBuf + startPos, pos - startPos, pDone)) {
return false;
}
m_pos = pos;
}
return true;
}
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