loadzip.c

DC的SEGA_GG模拟器源代码

#include "osd.h"

unsigned char *loadzip(char *archive, char *filename, int *filesize)
{
    char name[0x100];
    unsigned char *buffer;

    int zerror = UNZ_OK;
    unzFile zhandle;
    unz_file_info zinfo;

    zhandle = unzOpen(archive);
    if(!zhandle) return (NULL);

    /* Seek to first file in archive */
    zerror = unzGoToFirstFile(zhandle);
    if(zerror != UNZ_OK)
    {
        unzClose(zhandle);
        return (NULL);
    }

    /* Get information about the file */
    unzGetCurrentFileInfo(zhandle, &zinfo, &name[0], 0xff, NULL, 0, NULL, 0);
    *filesize = zinfo.uncompressed_size;

    /* Error: file size is zero */
    if(*filesize <= 0)
    {
        unzClose(zhandle);
        return (NULL);
    }

    /* Open current file */
    zerror = unzOpenCurrentFile(zhandle);
    if(zerror != UNZ_OK)
    {
        unzClose(zhandle);
        return (NULL);
    }

    /* Allocate buffer and read in file */
    buffer = malloc(*filesize);
    if(!buffer) return (NULL);
    zerror = unzReadCurrentFile(zhandle, buffer, *filesize);

    /* Internal error: free buffer and close file */
    if(zerror < 0 || zerror != *filesize)
    {
        free(buffer);
        buffer = NULL;
        unzCloseCurrentFile(zhandle);
        unzClose(zhandle);
        return (NULL);
    }

    /* Close current file and archive file */
    unzCloseCurrentFile(zhandle);
    unzClose(zhandle);

    memcpy(filename, name, 0x100);
    return (buffer);
}