1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/drivers/cdrom/isomem.c	Thu Dec 23 17:50:10 2010 +1000
     1.3 @@ -0,0 +1,178 @@
     1.4 +/*
     1.5 + * Copyright (c) 2007 Vreixo Formoso
     1.6 + * Copyright (c) 2009 Thomas Schmitt
     1.7 + *
     1.8 + * This file is part of the libisofs project; you can redistribute it and/or
     1.9 + * modify it under the terms of the GNU General Public License version 2 
    1.10 + * or later as published by the Free Software Foundation. 
    1.11 + * See COPYING file for details.
    1.12 + *
    1.13 + * Memory stream extracted for use in lxdream by Nathan Keynes 2010.
    1.14 + */
    1.15 +
    1.16 +#include <libisofs.h>
    1.17 +
    1.18 +#include <stdlib.h>
    1.19 +#include <string.h>
    1.20 +#include <limits.h>
    1.21 +#include <stdio.h>
    1.22 +
    1.23 +#ifndef MIN
    1.24 +#define MIN(a,b) ((a)<=(b) ? (a) : (b))
    1.25 +#endif
    1.26 +
    1.27 +#define ISO_MEM_FS_ID 4
    1.28 +
    1.29 +ino_t mem_serial_id = (ino_t)1;
    1.30 +
    1.31 +typedef struct
    1.32 +{
    1.33 +    uint8_t *buf;
    1.34 +    ssize_t offset; /* -1 if stream closed */
    1.35 +    ino_t ino_id;
    1.36 +    size_t size;
    1.37 +} MemStreamData;
    1.38 +
    1.39 +static
    1.40 +int mem_open(IsoStream *stream)
    1.41 +{
    1.42 +    MemStreamData *data;
    1.43 +    if (stream == NULL) {
    1.44 +        return ISO_NULL_POINTER;
    1.45 +    }
    1.46 +    data = (MemStreamData*)stream->data;
    1.47 +    if (data->offset != -1) {
    1.48 +        return ISO_FILE_ALREADY_OPENED;
    1.49 +    }
    1.50 +    data->offset = 0;
    1.51 +    return ISO_SUCCESS;
    1.52 +}
    1.53 +
    1.54 +static
    1.55 +int mem_close(IsoStream *stream)
    1.56 +{
    1.57 +    MemStreamData *data;
    1.58 +    if (stream == NULL) {
    1.59 +        return ISO_NULL_POINTER;
    1.60 +    }
    1.61 +    data = (MemStreamData*)stream->data;
    1.62 +    if (data->offset == -1) {
    1.63 +        return ISO_FILE_NOT_OPENED;
    1.64 +    }
    1.65 +    data->offset = -1;
    1.66 +    return ISO_SUCCESS;
    1.67 +}
    1.68 +
    1.69 +static
    1.70 +off_t mem_get_size(IsoStream *stream)
    1.71 +{
    1.72 +    MemStreamData *data;
    1.73 +    data = (MemStreamData*)stream->data;
    1.74 +
    1.75 +    return (off_t)data->size;
    1.76 +}
    1.77 +
    1.78 +static
    1.79 +int mem_read(IsoStream *stream, void *buf, size_t count)
    1.80 +{
    1.81 +    size_t len;
    1.82 +    MemStreamData *data;
    1.83 +    if (stream == NULL || buf == NULL) {
    1.84 +        return ISO_NULL_POINTER;
    1.85 +    }
    1.86 +    if (count == 0) {
    1.87 +        return ISO_WRONG_ARG_VALUE;
    1.88 +    }
    1.89 +    data = stream->data;
    1.90 +
    1.91 +    if (data->offset == -1) {
    1.92 +        return ISO_FILE_NOT_OPENED;
    1.93 +    }
    1.94 +
    1.95 +    if (data->offset >= data->size) {
    1.96 +        return 0; /* EOF */
    1.97 +    }
    1.98 +
    1.99 +    len = MIN(count, data->size - data->offset);
   1.100 +    memcpy(buf, data->buf + data->offset, len);
   1.101 +    data->offset += len;
   1.102 +    return len;
   1.103 +}
   1.104 +
   1.105 +static
   1.106 +int mem_is_repeatable(IsoStream *stream)
   1.107 +{
   1.108 +    return 1;
   1.109 +}
   1.110 +
   1.111 +static
   1.112 +void mem_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
   1.113 +                ino_t *ino_id)
   1.114 +{
   1.115 +    MemStreamData *data;
   1.116 +    data = (MemStreamData*)stream->data;
   1.117 +    *fs_id = ISO_MEM_FS_ID;
   1.118 +    *dev_id = 0;
   1.119 +    *ino_id = data->ino_id;
   1.120 +}
   1.121 +
   1.122 +static
   1.123 +void mem_free(IsoStream *stream)
   1.124 +{
   1.125 +    MemStreamData *data;
   1.126 +    data = (MemStreamData*)stream->data;
   1.127 +    free(data->buf);
   1.128 +    free(data);
   1.129 +}
   1.130 +
   1.131 +IsoStreamIface mem_stream_class = {
   1.132 +    0,
   1.133 +    "mem ",
   1.134 +    mem_open,
   1.135 +    mem_close,
   1.136 +    mem_get_size,
   1.137 +    mem_read,
   1.138 +    mem_is_repeatable,
   1.139 +    mem_get_id,
   1.140 +    mem_free
   1.141 +};
   1.142 +
   1.143 +/**
   1.144 + * Create a stream for reading from a arbitrary memory buffer.
   1.145 + * When the Stream refcount reach 0, the buffer is free(3).
   1.146 + *
   1.147 + * @return
   1.148 + *      1 sucess, < 0 error
   1.149 + */
   1.150 +int iso_mem_stream_new(unsigned char *buf, size_t size, IsoStream **stream)
   1.151 +{
   1.152 +    IsoStream *str;
   1.153 +    MemStreamData *data;
   1.154 +
   1.155 +    if (buf == NULL || stream == NULL) {
   1.156 +        return ISO_NULL_POINTER;
   1.157 +    }
   1.158 +
   1.159 +    str = malloc(sizeof(IsoStream));
   1.160 +    if (str == NULL) {
   1.161 +        return ISO_OUT_OF_MEM;
   1.162 +    }
   1.163 +    data = malloc(sizeof(MemStreamData));
   1.164 +    if (data == NULL) {
   1.165 +        free(str);
   1.166 +        return ISO_OUT_OF_MEM;
   1.167 +    }
   1.168 +
   1.169 +    /* fill data */
   1.170 +    data->buf = buf;
   1.171 +    data->size = size;
   1.172 +    data->offset = -1;
   1.173 +    data->ino_id = mem_serial_id++;
   1.174 +
   1.175 +    str->refcount = 1;
   1.176 +    str->data = data;
   1.177 +    str->class = &mem_stream_class;
   1.178 +
   1.179 +    *stream = str;
   1.180 +    return ISO_SUCCESS;
   1.181 +}