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This commit is contained in:
Natalia Portillo
2019-03-17 21:14:40 +00:00
parent 0c9044f290
commit 2b2834f30c
6 changed files with 105 additions and 20 deletions
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1
CMakeLists.txt
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@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.13)
project(libdicformat C)
set(CMAKE_C_STANDARD 99)
add_compile_definitions(__STDC_FORMAT_MACROS=1)
add_library(libdicformat SHARED include/dicformat/consts.h include/dicformat/enums.h include/dic.h include/dicformat.h
include/dicformat/decls.h include/dicformat/structs.h src/identify.c src/open.c include/dicformat/context.h src/close.c include/dicformat/errors.h)

20
include/dicformat/context.h
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@@ -10,11 +10,21 @@
typedef struct dicformatContext
{
uint64_t magic;
uint8_t libraryMajorVersion;
uint8_t libraryMinorVersion;
FILE *imageStream;
DicHeader header;
uint64_t magic;
uint8_t libraryMajorVersion;
uint8_t libraryMinorVersion;
FILE *imageStream;
DicHeader header;
struct dataLinkedList *mediaTagsHead;
struct dataLinkedList *mediaTagsTail;
} dicformatContext;
typedef struct dataLinkedList
{
struct dataLinkedList *previous;
struct dataLinkedList *next;
unsigned char *data;
int type;
} dataLinkedList;
#endif //LIBDICFORMAT_CONTEXT_H

16
include/dicformat/enums.h
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@@ -183,21 +183,21 @@ typedef enum
typedef enum
{
/** Block containing data */
DataBlock = 0x4B4C4244,
DataBlock = 0x4B4C4244,
/** Block containing a deduplication table */
DeDuplicationTable = 0X2A544444,
DeDuplicationTable = 0X2A544444,
/** Block containing the index */
Index = 0X58444E49,
IndexBlock = 0X58444E49,
/** Block containing logical geometry */
GeometryBlock = 0x4D4F4547,
GeometryBlock = 0x4D4F4547,
/** Block containing metadata */
MetadataBlock = 0x4154454D,
MetadataBlock = 0x4154454D,
/** Block containing optical disc tracks */
TracksBlock = 0x534B5254,
TracksBlock = 0x534B5254,
/** Block containing CICM XML metadata */
CicmBlock = 0x4D434943,
CicmBlock = 0x4D434943,
/** Block containing contents checksums */
ChecksumBlock = 0x4D534B43,
ChecksumBlock = 0x4D534B43,
/** TODO: Block containing data position measurements */
DataPositionMeasurementBlock = 0x2A4D5044,
/** TODO: Block containing a snapshot index */

3
include/dicformat/errors.h
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@@ -7,6 +7,7 @@
#define DICF_ERROR_NOT_DICFORMAT -1
#define DICF_ERROR_FILE_TOO_SMALL -2
#define DICF_ERROR_INCOMPATIBLE_VERSION -2
#define DICF_ERROR_INCOMPATIBLE_VERSION -3
#define DICF_ERROR_CANNOT_READ_INDEX -4
#endif //LIBDICFORMAT_ERRORS_H

2
include/dicformat/structs.h
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@@ -104,7 +104,7 @@ typedef struct IndexHeader
typedef struct IndexEntry
{
/**Type of item pointed by this entry */
uint32_t uint32_t;
uint32_t blockType;
/**Type of data contained by the block pointed by this entry */
uint16_t dataType;
/**Offset in file where item is stored */

83
src/open.c
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@@ -34,12 +34,21 @@
#include <dicformat.h>
#include <malloc.h>
#include <errno.h>
#include <inttypes.h>
#include <string.h>
// TODO: Check CRC64 on structures
// TODO: ImageInfo
void *open(const char *filepath)
{
dicformatContext *ctx = malloc(sizeof(dicformatContext));
int errorNo;
size_t readBytes;
long pos;
IndexHeader idxHeader;
IndexEntry *idxEntries;
memset(ctx, 0, sizeof(dicformatContext));
if(ctx == NULL)
return NULL;
@@ -82,14 +91,78 @@ void *open(const char *filepath)
return NULL;
}
fprintf(stderr,
"libdicformat: Opening image version %d.%d",
ctx->header.imageMajorVersion,
ctx->header.imageMinorVersion);
// Read the index header
pos = fseek(ctx->imageStream, ctx->header.indexOffset, SEEK_CUR);
if(pos < 0)
{
free(ctx);
errno = DICF_ERROR_CANNOT_READ_INDEX;
return NULL;
}
pos = ftell(ctx->imageStream);
if(pos != ctx->header.indexOffset)
{
free(ctx);
errno = DICF_ERROR_CANNOT_READ_INDEX;
return NULL;
}
readBytes = fread(&idxHeader, sizeof(IndexHeader), 1, ctx->imageStream);
if(readBytes != sizeof(IndexHeader) || idxHeader.identifier != IndexBlock)
{
free(ctx);
errno = DICF_ERROR_CANNOT_READ_INDEX;
return NULL;
}
fprintf(stderr, "libdicformat: Index at %"PRIu64" contains %d entries", ctx->header.indexOffset, idxHeader.entries);
idxEntries = malloc(sizeof(IndexEntry) * idxHeader.entries);
if(idxEntries == NULL)
{
errorNo = errno;
free(ctx);
errno = errorNo;
return NULL;
}
memset(idxEntries, 0, sizeof(IndexEntry) * idxHeader.entries);
readBytes = fread(idxEntries, sizeof(IndexEntry), idxHeader.entries, ctx->imageStream);
if(readBytes != sizeof(IndexEntry) * idxHeader.entries)
{
free(idxEntries);
free(ctx);
errno = DICF_ERROR_CANNOT_READ_INDEX;
return NULL;
}
for(int i = 0; i < idxHeader.entries; i++)
{
fprintf(stderr,
"libdicformat: Block type %4s with data type %4s is indexed to be at %"PRIu64"",
(char *)&idxEntries[i].blockType,
(char *)&idxEntries[i].dataType,
idxEntries[i].offset);
}
ctx->magic = DIC_MAGIC;
ctx->libraryMajorVersion = LIBDICFORMAT_MAJOR_VERSION;
ctx->libraryMinorVersion = LIBDICFORMAT_MINOR_VERSION;
fprintf(stderr,
"libdicformat: Opened image version %d.%d",
ctx->header.imageMajorVersion,
ctx->header.imageMinorVersion);
free(idxEntries);
return ctx;
}