gecko-dev/xpcom/io/nsLocalFileCommon.cpp

/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * for the specific language governing rights and limitations under the
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 * The Original Code is mozilla.org code.
 *
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#include "nsIServiceManager.h"
#ifndef XPCOM_STANDALONE
#include "nsIURLParser.h"
#include "nsNetCID.h"
#endif /* XPCOM_STANDALONE */


#include "nsLocalFile.h" // includes platform-specific headers
#include "nsLocalFileUnicode.h"

#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsXPIDLString.h"

#ifndef XPCOM_STANDALONE
static NS_DEFINE_CID(kURLParserCID, NS_NOAUTHURLPARSER_CID);
#endif


void NS_StartupLocalFile()
{
#ifdef XP_WIN
  CoInitialize(NULL);  // FIX: we should probably move somewhere higher up during startup
#endif
}

void NS_ShutdownLocalFile()
{
  NS_ShutdownLocalFileUnicode();
  
#ifdef XP_WIN
  CoUninitialize();
#endif
}

// should work on Macintosh, Unix, and Win32.
#define kMaxFilenameLength 31  

NS_IMETHODIMP
nsLocalFile::CreateUnique(PRUint32 type, PRUint32 attributes)
{
    nsresult rv = Create(type, attributes);
    
    if (NS_SUCCEEDED(rv)) return NS_OK;
    if (rv != NS_ERROR_FILE_ALREADY_EXISTS) return rv;

    char* leafName; 
    rv = GetLeafName(&leafName);

    if (NS_FAILED(rv)) return rv;

    char* lastDot = strrchr(leafName, '.');
    char suffix[kMaxFilenameLength + 1] = "";
    if (lastDot)
    {
        strncpy(suffix, lastDot, kMaxFilenameLength); // include '.'
        suffix[kMaxFilenameLength] = 0; // make sure it's null terminated
        *lastDot = '\0'; // strip suffix and dot.
    }

    // 27 should work on Macintosh, Unix, and Win32. 
    const int maxRootLength = 27 - nsCRT::strlen(suffix) - 1;

    if ((int)nsCRT::strlen(leafName) > (int)maxRootLength)
        leafName[maxRootLength] = '\0';

    for (short indx = 1; indx < 10000; indx++)
    {
        // start with "Picture-1.jpg" after "Picture.jpg" exists
        char newName[kMaxFilenameLength + 1];
        sprintf(newName, "%s-%d%s", leafName, indx, suffix);
        SetLeafName(newName);

        rv = Create(type, attributes);
    
        if (NS_SUCCEEDED(rv) || rv != NS_ERROR_FILE_ALREADY_EXISTS) 
        {
            nsMemory::Free(leafName);
            return rv;
        }
    }
 
    nsMemory::Free(leafName);
    // The disk is full, sort of
    return NS_ERROR_FILE_TOO_BIG;
}

nsresult nsLocalFile::ParseURL(const char* inURL, char **outHost, char **outDirectory,
                               char **outFileBaseName, char **outFileExtension)
{
    nsresult rv = NS_ERROR_NOT_IMPLEMENTED;

#ifndef XPCOM_STANDALONE
    NS_ENSURE_ARG(inURL);
    NS_ENSURE_ARG_POINTER(outHost);
    *outHost = nsnull;
    NS_ENSURE_ARG_POINTER(outDirectory);
    *outDirectory = nsnull;
    NS_ENSURE_ARG_POINTER(outFileBaseName);
    *outFileBaseName = nsnull;
    NS_ENSURE_ARG_POINTER(outFileExtension);
    *outFileExtension = nsnull;

    nsCOMPtr<nsIURLParser> parser(do_GetService(kURLParserCID, &rv));
    if (NS_FAILED(rv)) return rv;

    PRUint32 pathPos, filepathPos, directoryPos, basenamePos, extensionPos;
    PRInt32 pathLen, filepathLen, directoryLen, basenameLen, extensionLen;

    // invoke the parser to extract the URL path
    rv = parser->ParseURL(inURL, -1,
                          nsnull, nsnull, // dont care about scheme
                          nsnull, nsnull, // dont care about authority
                          &pathPos, &pathLen);
    if (NS_FAILED(rv)) return rv;

    // invoke the parser to extract filepath from the path
    rv = parser->ParsePath(inURL + pathPos, pathLen,
                           &filepathPos, &filepathLen,
                           nsnull, nsnull,  // dont care about param
                           nsnull, nsnull,  // dont care about query
                           nsnull, nsnull); // dont care about ref
    if (NS_FAILED(rv)) return rv;

    filepathPos += pathPos;

    // invoke the parser to extract the directory and filename from filepath
    rv = parser->ParseFilePath(inURL + filepathPos, filepathLen,
                           &directoryPos, &directoryLen,
                           &basenamePos, &basenameLen,
                           &extensionPos, &extensionLen);
    if (NS_FAILED(rv)) return rv;

    if (directoryLen > 0)
        *outDirectory = PL_strndup(inURL + filepathPos + directoryPos, directoryLen);
    if (basenameLen > 0)
        *outFileBaseName = PL_strndup(inURL + filepathPos + basenamePos, basenameLen);
    if (extensionLen > 0)
        *outFileExtension = PL_strndup(inURL + filepathPos + extensionPos, extensionLen);
    // since we are using a no-auth url parser, there will never be a host
    
#endif /* XPCOM_STANDALONE */

    return NS_OK;
}