win32impl.cpp

FreeAMP(MP3播放)程序源代码-用来研究MP3解码

#include <kernel/image.h>
#include <support/Debug.h>
#include <dirent.h>
#include <string.h>
#include <iostream.h>
#include <ctype.h>

#include "win32impl.h"

class FindData
{
public:
    DIR *pDir;
    char *dir; // points to directory name of search
    char *rest; // points to remainder of the filename, which we should match against
    ~FindData();
    FindData();
};

FindData::FindData()
{
    dir = NULL;
    rest = NULL;
    pDir = NULL;
}

FindData::~FindData()
{
    if (dir) delete dir;
    if (rest) delete rest;
}

bool Match(char *,char *);
void FillWin32FindData(char *,char *,WIN32_FIND_DATA *);

HANDLE
FindFirstFile(char *lpFileName, WIN32_FIND_DATA *lpFindFileData)
{
    // cout << "FindFirstFile: begin" << endl;
    // cout << "file = " << lpFileName << endl;
    if (!lpFileName || !lpFindFileData) return INVALID_HANDLE_VALUE;

    FindData *pFD = new FindData();
    // 1) find earliest wildcard, chop up to directory marker
    char *ps = strchr(lpFileName,'*');
    char *pQ = strchr(lpFileName,'?');
    char *chopChar = '\0';
    if (!ps && !pQ) {
        // no wildcards... fill in the win32_find_data structure
        FillWin32FindData(NULL,lpFileName,lpFindFileData);
        // no more files...
        pFD->pDir = NULL;
        pFD->dir = NULL;
        pFD->rest = NULL;
        return (HANDLE)pFD;
    } else if (!ps && pQ) {
        chopChar = pQ;
    } else if (ps && !pQ) {
        chopChar = ps;
    } else {
        chopChar = (ps > pQ) ? pQ : ps;
    }

    char holdChar = *chopChar;
    *chopChar = '\0';
    char *lastSlash = strrchr(lpFileName, '/');
    *chopChar = holdChar;
    char *pDir, *pRest;
    if (lastSlash == lpFileName) {
        pRest = lastSlash + 1;
        pFD->dir = new char[2];
        pFD->rest = new char[strlen(pRest)+1];
        strcpy(pFD->dir, "/");
        strcpy(pFD->rest, pRest);
    } else if (lastSlash) {
        pDir = lpFileName;
        pRest = lastSlash + sizeof(char);
        *lastSlash = '\0';
        pFD->dir = new char[strlen(pDir)+1];
        pFD->rest = new char[strlen(pRest)+1];
        strcpy(pFD->dir,pDir);
        strcpy(pFD->rest,pRest);
        *lastSlash = '/';
    } else {
        pDir = NULL;
        pRest = lpFileName;
        pFD->rest = new char[strlen(pRest)+1];
        strcpy(pFD->rest,pRest);
    }

    if (pFD->dir) {
        pFD->pDir = opendir(pFD->dir);
        if (pFD->pDir) {
            struct dirent *pdirent = readdir(pFD->pDir);
            while (pdirent) {
                //cout << "FindFirstFile: matching " << pFD->rest << " to " << pdirent->d_name << endl;
                if (Match(pFD->rest,pdirent->d_name)) {
                    FillWin32FindData(pFD->dir, pdirent->d_name,lpFindFileData);
                    return (HANDLE)pFD;
                }
                pdirent = readdir(pFD->pDir);
            }
            // no matching directory entries...
            return INVALID_HANDLE_VALUE;
        } else {
            // dir open failed, so no matches
            return INVALID_HANDLE_VALUE;
        }
    } else {
        // no directory, just see if file exists...
    }

    return INVALID_HANDLE_VALUE;
}

bool
Match(char *pattern,char *string)
{
    // cout << "Comparing " << pattern << " to " << string << endl;
    if (!pattern || !string) return false;
    char *ps1 = pattern;
    char *ps2 = string;

    while ((*ps1 != '\0') && (ps2 != '\0')) {
        switch (*ps1) {
        case '?':
            ps1++;
            ps2++;
            break;
        case '*': {
            // find existance of next block
            ps1++;
            if (*ps1 == '\0')
                return true;
            char *pS = strchr(ps1,'*');
            char *pQ = strchr(ps1,'?');
            if (pS) {*pS = '\0';}  if (pQ) {*pQ = '\0';}
            char *pStr = strstr(ps2,ps1);
            if (pS) {*pS = '*';} if (pQ) {*pQ = '?';}
            if (pStr) {
                ps2 = pStr;
                return Match(ps1,ps2);
            }
            return false;
            break; }
        default:
            if (tolower(*ps1) != tolower(*ps2)) return false;
            ps1++;
            ps2++;
            break;
        }
    }
    if ((*ps1 == '\0') && (*ps2 == '\0'))
        return true;
    else
        return false;
}


void
FillWin32FindData(char *pDir, char *pF,WIN32_FIND_DATA *wfd)
{
    // cout << "FillWin32FindData: Entering: " << pF << endl;
    strcpy(wfd->cFileName,pF);

    struct stat st;
    char *name = new char[strlen(pDir) + strlen(DIR_MARKER_STR) + strlen(pF) + 1];

    if (pDir)
    {
       strcpy(name, pDir);
       if (name[strlen(name) - 1] != DIR_MARKER)
           strcat(name, DIR_MARKER_STR);
       strcat(name, pF);
    }
    else
       strcpy(name, pF);

    if (lstat(name, &st) == -1) {
        delete name;
        return;
    }
    if (S_ISLNK(st.st_mode)) 
        wfd->dwFileAttributes = FILE_ATTRIBUTE_SYMLINK;
    else if (S_ISDIR(st.st_mode))
        wfd->dwFileAttributes = FILE_ATTRIBUTE_DIRECTORY;
    else
        wfd->dwFileAttributes = FILE_ATTRIBUTE_NORMAL;

    delete name;
}


bool
FindNextFile(HANDLE hFindHandle, WIN32_FIND_DATA *lpFindFileData)
{
    // cout << "FindNext: begin" << endl;
    if (!hFindHandle || !lpFindFileData) return false;
    FindData *pFD = (FindData *)hFindHandle;
    if (!pFD->pDir) {
        // no dir, that means only one match, which we already did
        return false;
    }
    struct dirent *pdirent = readdir(pFD->pDir);
    while (pdirent) {
        if (Match(pFD->rest,pdirent->d_name)) {
            FillWin32FindData(pFD->dir, pdirent->d_name,lpFindFileData);
            return true;
        }
        pdirent = readdir(pFD->pDir);
    }
    // no matches, or dir empty...
    return false;
}


bool
FindClose(HANDLE hFindFile)
{
    if (!hFindFile) return false;
    FindData *pFD = (FindData *)hFindFile;
    closedir(pFD->pDir);
    return true;
}

HINSTANCE
LoadLibrary(char *lpLibFileName)
{
    image_id    addon_image;
    addon_image = load_add_on( lpLibFileName );
    if ( addon_image > 0 )
    {
        PRINT(( "Add-on loaded successfully: %s\n", lpLibFileName ));
        return (HINSTANCE)addon_image;
    }
    else
    {
        PRINT(( "error loading add-on: %s\n", lpLibFileName ));
        return (HINSTANCE)NULL;
    }
}



bool FreeLibrary(HMODULE hLibModule)
{
    // cout << "FreeLibrary" << endl;
    if ( unload_add_on( (image_id)hLibModule ) < B_NO_ERROR )
    {
        PRINT(( "error unloading addon\n" ));
        return false;
    }
    else
    {
        PRINT(( "addon unloaded successfully\n" ));
        return true;
    }
}


FARPROC
GetProcAddress( HMODULE hModule, char * lpProcName )
{
    // cout << "GetProcAddress: " << lpProcName << endl;
    void    (*exportedFunc)();
    status_t err;
    err = get_image_symbol(
                        (image_id)hModule,
                        lpProcName,
                        B_SYMBOL_TYPE_TEXT,
                        (void**)&exportedFunc
                        );
    if ( err < B_NO_ERROR )
    {
        PRINT(( "couldn't get symbol %s\n", lpProcName ));
        return NULL;
    }
    else
    {
        PRINT(( "obtained symbol %s successfully\n", lpProcName ));
        return (FARPROC)exportedFunc;
    }
}