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Little changes.

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This commit is contained in:
Vreixo Formoso 2007-12-02 17:59:36 +01:00
parent 5fa2490a48
commit 79c37ff193
7 changed files with 207 additions and 51 deletions
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43
src/builder.h Normal file
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@ -0,0 +1,43 @@
/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
#ifndef LIBISO_BUILDER_H_
#define LIBISO_BUILDER_H_
/*
* Definitions for IsoNode builders.
*/
/*
* Some functions here will be moved to libisofs.h when we expose
* Builder.
*/
#include "node.h"
typedef struct Iso_Node_Builder IsoNodeBuilder;
struct Iso_Node_Builder
{
/**
*
* @return
* 1 on success, < 0 on error
*/
int (*create_file)(const IsoFileSource *src, IsoFile **file);
int refcount;
void *data;
};
#endif /*LIBISO_BUILDER_H_*/

100
src/filesrc.h Normal file
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@ -0,0 +1,100 @@
/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
#ifndef LIBISO_FILESRC_H_
#define LIBISO_FILESRC_H_
/*
* FIXME definitions here shouldn't be used for now!!!
*
*/
/*
* Definitions of streams.
*/
/*
* Some functions here will be moved to libisofs.h when we expose
* Streams.
*/
//typedef struct Iso_Stream IsoStream;
//
//struct Iso_Stream
//{
// /**
// * Opens the stream.
// *
// * @return
// * 1 on success, < 0 on error, 2 file is smaller than expect,
// * 3 file is larger than expected (2 and 3 are not errors, they're
// * handled by read_block, see there. Moreover, IsooStream
// * implementations doesn't need to check that)
// */
// int (*open)(IsoStream *stream);
//
// /**
// * Close the Stream.
// * @return 1 on success, < 0 on error
// */
// int (*close)(IsoStream *stream);
//
// /**
// * Get the size (in bytes) of the stream. This function must return
// * always the same size, even if the underlying source file has changed.
// */
// off_t (*get_size)(IsoStream *stream);
//
// /**
// * Read a block (2048 bytes) from the stream.
// *
// * This function should always read the full 2048 bytes, blocking if
// * needed. When it reaches EOF, the buf is filled with 0's, if needed.
// * Note that the EOF is not reported in that call, but in the next call.
// * I.e., when the EOF is reported you can be sure that the function
// * has not written anything to the buffer. If the file size is a multiple
// * of block size, i.e N*2048, the read_block reports the EOF just when
// * reading the N+1 block.
// *
// * Note that EOF refers to the original size as reported by get_size.
// * If the underlying source size has changed, this function should take
// * care of this, truncating the file, or filling the buffer with 0s. I.e.
// * this function return 0 (EOF) only when get_size() bytes have been
// * readed.
// *
// * On an I/O error, or a file smaller than the expected size, this
// * function returns a [specific error code], and the buffer is filled
// * with 0s. Subsequent calls will still return an error code and fill
// * buffer with 0's, until EOF (as defined above) is reached, and then
// * the function will return 0.
// *
// * Note that if the current size is larger than expected, you don't get
// * any error on reading.
// *
// * @param buf
// * Buffer where data fill be copied, with at least 2048 bytes.
// * @return
// * 1 sucess, 0 EOF, < 0 error (buf is filled with 0's)
// */
// int (*read_block)(IsoStream *stream, void *buf);
//
// /**
// * Whether this Stram can be read several times, with the same results.
// * For example, a regular file is repeatable, you can read it as many
// * times as you want. However, a pipe isn't.
// *
// * This function doesn't take into account if the file has been modified
// * between the two reads.
// */
// int (*is_repeatable)(IsoStream *stream);
//
// int refcount;
// void *data;
//}
#endif /*LIBISO_FILESRC_H_*/

50
src/fs_local.c
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@ -24,6 +24,11 @@
#include <libgen.h>
#include <string.h>
/*
* We can share a local filesystem object, as it has no private atts.
*/
IsoFilesystem *lfs = NULL;
typedef struct
{
/* IsoFilesystem *fs; It seems not needed */
@ -314,6 +319,12 @@ int lfs_readlink(IsoFileSource *src, char *buf, size_t bufsiz)
return ISO_SUCCESS;
}
static
IsoFilesystem* lfs_get_filesystem(IsoFileSource *src)
{
return src == NULL ? NULL : lfs;
}
static
void lfs_free(IsoFileSource *src)
{
@ -328,6 +339,7 @@ void lfs_free(IsoFileSource *src)
free(data->path);
free(data);
iso_filesystem_unref(lfs);
}
/**
@ -344,6 +356,11 @@ int iso_file_source_new_lfs(const char *path, IsoFileSource **src)
return ISO_NULL_POINTER;
}
if (lfs == NULL) {
/* this should never happen */
return ISO_ERROR;
}
/* allocate memory */
data = malloc(sizeof(_LocalFsFileSource));
if (data == NULL) {
@ -379,7 +396,11 @@ int iso_file_source_new_lfs(const char *path, IsoFileSource **src)
lfs_src->read = lfs_read;
lfs_src->readdir = lfs_readdir;
lfs_src->readlink = lfs_readlink;
lfs_src->get_filesystem = lfs_get_filesystem;
lfs_src->free = lfs_free;
/* take a ref to local filesystem */
iso_filesystem_ref(lfs);
/* return */
*src = lfs_src;
@ -413,24 +434,27 @@ void lfs_fs_free(IsoFilesystem *fs)
int iso_local_filesystem_new(IsoFilesystem **fs)
{
IsoFilesystem *lfs;
if (fs == NULL) {
return ISO_NULL_POINTER;
}
lfs = malloc(sizeof(IsoFilesystem));
if (lfs == NULL) {
return ISO_OUT_OF_MEM;
if (lfs != NULL) {
/* just take a new ref */
iso_filesystem_ref(lfs);
} else {
lfs = malloc(sizeof(IsoFilesystem));
if (lfs == NULL) {
return ISO_OUT_OF_MEM;
}
/* fill struct */
lfs->refcount = 1;
lfs->data = NULL; /* we don't need private data */
lfs->get_root = lfs_get_root;
lfs->get_by_path = lfs_get_by_path;
lfs->free = lfs_fs_free;
}
/* fill struct */
lfs->refcount = 1;
lfs->data = NULL; /* we don't need private data */
lfs->get_root = lfs_get_root;
lfs->get_by_path = lfs_get_by_path;
lfs->free = lfs_fs_free;
*fs = lfs;
return ISO_SUCCESS;
}

13
src/fsource.h
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@ -42,7 +42,9 @@ struct Iso_Filesystem
void (*free)(IsoFilesystem *fs);
int refcount;
/* TODO each file will take a ref to IsoFilesystem, so maybe a 64bits
* integer is a better choose for this */
unsigned int refcount;
void *data;
};
@ -170,6 +172,15 @@ struct Iso_File_Source
*
*/
int (*readlink)(IsoFileSource *src, char *buf, size_t bufsiz);
/**
* Get the filesystem for this source. No extra ref is added, so you
* musn't unref the IsoFilesystem.
*
* @return
* The filesystem, NULL on error
*/
IsoFilesystem* (*get_filesystem)(IsoFileSource *src);
/**
* Free implementation specific data. Should never be called by user.

2
src/libisofs.h
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@ -13,6 +13,8 @@
typedef struct Iso_Node IsoNode;
typedef struct Iso_Dir IsoDir;
typedef struct Iso_Symlink IsoSymlink;
typedef struct Iso_File IsoFile;
typedef struct Iso_Dir_Iter IsoDirIter;
/**

3
src/node.h
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@ -13,6 +13,7 @@
*/
#include "libisofs.h"
#include "stream.h"
#include <sys/types.h>
#include <sys/stat.h>
@ -97,7 +98,7 @@ struct Iso_File
* Higher weighting filesare written at the beginning of image
*/
int sort_weight;
IsoStream *stream;
};
struct Iso_Symlink

47
src/stream.h
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@ -25,10 +25,7 @@ struct Iso_Stream
* Opens the stream.
*
* @return
* 1 on success, < 0 on error, 2 file is smaller than expect,
* 3 file is larger than expected (2 and 3 are not errors, they're
* handled by read_block, see there. Moreover, IsooStream
* implementations doesn't need to check that)
* 1 on success, < 0 on error
*/
int (*open)(IsoStream *stream);
@ -39,44 +36,22 @@ struct Iso_Stream
int (*close)(IsoStream *stream);
/**
* Get the size (in bytes) of the stream. This function must return
* always the same size, even if the underlying source file has changed.
* Get the size (in bytes) of the stream.
*/
off_t (*get_size)(IsoStream *stream);
/**
* Read a block (2048 bytes) from the stream.
* Attempts to read up to count bytes from the given stream into
* the buffer starting at buf.
*
* This function should always read the full 2048 bytes, blocking if
* needed. When it reaches EOF, the buf is filled with 0's, if needed.
* Note that the EOF is not reported in that call, but in the next call.
* I.e., when the EOF is reported you can be sure that the function
* has not written anything to the buffer. If the file size is a multiple
* of block size, i.e N*2048, the read_block reports the EOF just when
* reading the N+1 block.
* The stream must be open() before calling this, and close() when no
* more needed.
*
* Note that EOF refers to the original size as reported by get_size.
* If the underlying source size has changed, this function should take
* care of this, truncating the file, or filling the buffer with 0s. I.e.
* this function return 0 (EOF) only when get_size() bytes have been
* readed.
*
* On an I/O error, or a file smaller than the expected size, this
* function returns a [specific error code], and the buffer is filled
* with 0s. Subsequent calls will still return an error code and fill
* buffer with 0's, until EOF (as defined above) is reached, and then
* the function will return 0.
*
* Note that if the current size is larger than expected, you don't get
* any error on reading.
*
* @param buf
* Buffer where data fill be copied, with at least 2048 bytes.
* @return
* 1 sucess, 0 EOF, < 0 error (buf is filled with 0's)
* @return
* number of bytes read, 0 if EOF, < 0 on error
*/
int (*read_block)(IsoStream *stream, void *buf);
int (*read)(IsoStream *stream, void *buf, size_t count);
/**
* Whether this Stram can be read several times, with the same results.
* For example, a regular file is repeatable, you can read it as many
@ -89,6 +64,6 @@ struct Iso_Stream
int refcount;
void *data;
}
};
#endif /*STREAM_H_*/