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Read and traverse the index.

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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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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;
}