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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "memfile.h"
 
struct MEMFILE {
    long  length;
    long  pos;
    void *data;
};
 
static MEMFILE *
memfile_init (size_t len)
{
    MEMFILE *memfile = NULL;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memfile_init()\n");
#endif
 
    memfile = (MEMFILE *) calloc (sizeof (MEMFILE), 1);
    if (! memfile)
    {
        perror ("memfile_init() : calloc");
        return NULL;
    }
 
    memfile-> length = len;
    memfile-> pos = 0;
    memfile-> data = calloc (len + 1, 1);
 
    return memfile;
}
 
MEMFILE *
memopenbuf (const char *name, const char * dummy)
{
    MEMFILE *memfile = NULL;
    size_t len = 0;
    char *data = NULL;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memopenbuf()\n");
#endif
 
    /* get length */
    len = strlen (name);
 
    /* initialize memfile */
    memfile = memfile_init (len);
    if (! memfile)
    {
        perror ("memopenbuf() : memfile_init");
        return NULL;
    }
 
    /* fill data */
    memcpy ((char *) memfile-> data, name, memfile-> length);
    data = (char *) memfile-> data + memfile-> length;
    *data = '\0';
 
    return memfile;
}
 
MEMFILE *
memopen (const char *name, const char * dummy)
{
    MEMFILE *memfile = NULL;
    size_t len = 0;
    char *data = NULL;
    FILE *fp = NULL;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memopen()\n");
#endif
 
    /* get length */
    fp = fopen (name, "rb");
    if (! fp)
    {
        perror ("memopen() : fopen");
        return NULL;
    }
    fseek (fp, 0, SEEK_END);
    len = ftell (fp);
 
    /* initialize memfile */
    memfile = memfile_init (len);
    if (! memfile)
    {
        perror ("memopen() : memfile_init");
        return NULL;
    }
 
    /* fill data */
    fseek (fp, 0, SEEK_SET);
    fread (memfile-> data, 1, memfile-> length, fp);
    data = (char *) memfile-> data + memfile-> length;
    *data = '\0';
    fclose (fp);
 
    return memfile;
}
 
void
memclose (MEMFILE *handle)
{
    MEMFILE *memfile = handle;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memclose()\n");
#endif
 
    free (memfile-> data);
    memfile-> data = NULL;
 
    free (memfile);
    memfile = NULL;
}
 
size_t
memread (void *buffer, size_t n, MEMFILE *handle)
{
    MEMFILE *memfile = handle;
    size_t nbread = n;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memread()\n");
#endif
 
    /* combien de caractères peut-on encore lire ? */
    if (memfile-> pos + (long) n >= memfile-> length)
        nbread = memfile-> length - memfile-> pos;
 
    memcpy (buffer, (char *) memfile-> data + memfile-> pos, nbread);
    memfile-> pos += nbread;
 
    return nbread;
}
 
char *
memgets (void *buffer, int size, MEMFILE *handle)
{
    MEMFILE *memfile = handle;
    char *data;
    int pos;
    int col;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memgets()\n");
#endif
 
    if (memfile-> pos >= memfile-> length)
    {
        printf ("memgets() : Fin de fichier\n");
        return NULL;
    }
 
    for (pos = memfile-> pos; pos < memfile-> length && pos < memfile-> pos + size; pos++)
    {
        data = (char *) memfile-> data + pos;
        col = pos - memfile-> pos;
#ifdef DEBUG
        printf ("col=%d, pos=%d, data[0]='%c' (%d)\n", col, pos, data[0], data[0]);
#endif
        if ('\n' == data[0])
            break;
    }
 
    memcpy (buffer, (char *) memfile-> data + memfile-> pos, pos + 1);
    data = buffer;
    data [pos + 1 - memfile-> pos] = '\0';
    memfile-> pos = pos + 1;
 
    return (char *) buffer;
}
 
int
memeof (MEMFILE *handle)
{
    MEMFILE *memfile = handle;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memeof()\n");
#endif
 
    if (memfile-> pos == memfile-> length)
        return EOF;
 
    return 0;
}
 
void
memseek (MEMFILE *handle, long offset, int origin)
{
    MEMFILE *memfile = handle;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memseek()\n");
#endif
 
    if (origin == SEEK_SET)
        memfile-> pos = offset;
    else
        if (origin == SEEK_CUR)
            memfile-> pos += offset;
        else
            if (origin == SEEK_END)
                memfile-> pos = memfile-> length + offset;
 
    if (memfile-> pos > memfile-> length)
        memfile-> pos = memfile-> length;
}
 
long
memtell (MEMFILE *handle)
{
    MEMFILE *memfile = handle;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memtell()\n");
#endif
 
    return memfile-> pos;
}
 
int
memgetc (MEMFILE *handle)
{
    MEMFILE *memfile = handle;
    char *data;
 
#ifdef DEBUG
    fprintf (stderr, "DEBUG: memgetc()\n");
#endif
 
    if (memfile-> pos >= memfile-> length)
        return EOF;
 
    data = (char *) memfile-> data + memfile-> pos;
 
    return data[0];
} | 
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