/***************************************
* CABD_READ_HEADERS
***************************************
* reads the cabinet file header, folder list and file list.
* fills out a pre-existing mscabd_cabinet structure, allocates memory
* for folders and files as necessary
*/
static int cabd_read_headers(struct mspack_system *sys,
struct mspack_file *fh,
struct mscabd_cabinet_p *cab,
off_t offset, int quiet)
{
int num_folders, num_files, folder_resv, i, x;
struct mscabd_folder_p *fol, *linkfol = NULL;
struct mscabd_file *file, *linkfile = NULL;
unsigned char buf[64];
/* initialise pointers */
cab->base.next = NULL;
cab->base.files = NULL;
cab->base.folders = NULL;
cab->base.prevcab = cab->base.nextcab = NULL;
cab->base.prevname = cab->base.nextname = NULL;
cab->base.previnfo = cab->base.nextinfo = NULL;
cab->base.base_offset = offset;
/* seek to CFHEADER */
if (sys->seek(fh, offset, MSPACK_SYS_SEEK_START)) {
return MSPACK_ERR_SEEK;
}
/* read in the CFHEADER */
if (sys->read(fh, &buf[0], cfhead_SIZEOF) != cfhead_SIZEOF) {
return MSPACK_ERR_READ;
}
/* check for "MSCF" signature */
if (EndGetI32(&buf[cfhead_Signature]) != 0x4643534D) {
return MSPACK_ERR_SIGNATURE;
}
/* some basic header fields */
cab->base.length = EndGetI32(&buf[cfhead_CabinetSize]);
cab->base.set_id = EndGetI16(&buf[cfhead_SetID]);
cab->base.set_index = EndGetI16(&buf[cfhead_CabinetIndex]);
/* get the number of folders */
num_folders = EndGetI16(&buf[cfhead_NumFolders]);
if (num_folders == 0) {
if (!quiet) sys->message(fh, "no folders in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
/* get the number of files */
num_files = EndGetI16(&buf[cfhead_NumFiles]);
if (num_files == 0) {
if (!quiet) sys->message(fh, "no files in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
/* check cabinet version */
if ((buf[cfhead_MajorVersion] != 1) && (buf[cfhead_MinorVersion] != 3)) {
if (!quiet) sys->message(fh, "WARNING; cabinet version is not 1.3");
}
/* read the reserved-sizes part of header, if present */
cab->base.flags = EndGetI16(&buf[cfhead_Flags]);
if (cab->base.flags & cfheadRESERVE_PRESENT) {
if (sys->read(fh, &buf[0], cfheadext_SIZEOF) != cfheadext_SIZEOF) {
return MSPACK_ERR_READ;
}
cab->base.header_resv = EndGetI16(&buf[cfheadext_HeaderReserved]);
folder_resv = buf[cfheadext_FolderReserved];
cab->block_resv = buf[cfheadext_DataReserved];
if (cab->base.header_resv > 60000) {
if (!quiet) sys->message(fh, "WARNING; reserved header > 60000.");
}
/* skip the reserved header */
if (cab->base.header_resv) {
if (sys->seek(fh, (off_t) cab->base.header_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
}
else {
cab->base.header_resv = 0;
folder_resv = 0;
cab->block_resv = 0;
}
/* read name and info of preceeding cabinet in set, if present */
if (cab->base.flags & cfheadPREV_CABINET) {
cab->base.prevname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.previnfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
/* read name and info of next cabinet in set, if present */
if (cab->base.flags & cfheadNEXT_CABINET) {
cab->base.nextname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.nextinfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
/* read folders */
for (i = 0; i < num_folders; i++) {
if (sys->read(fh, &buf[0], cffold_SIZEOF) != cffold_SIZEOF) {
return MSPACK_ERR_READ;
}
if (folder_resv) {
if (sys->seek(fh, (off_t) folder_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
if (!(fol = sys->alloc(sys, sizeof(struct mscabd_folder_p)))) {
return MSPACK_ERR_NOMEMORY;
}
fol->base.next = NULL;
fol->base.comp_type = EndGetI16(&buf[cffold_CompType]);
fol->base.num_blocks = EndGetI16(&buf[cffold_NumBlocks]);
fol->data.next = NULL;
fol->data.cab = (struct mscabd_cabinet_p *) cab;
fol->data.offset = offset + (off_t)
( (unsigned int) EndGetI32(&buf[cffold_DataOffset]) );
fol->merge_prev = NULL;
fol->merge_next = NULL;
/* link folder into list of folders */
if (!linkfol) cab->base.folders = (struct mscabd_folder *) fol;
else linkfol->base.next = (struct mscabd_folder *) fol;
linkfol = fol;
}
/* read files */
for (i = 0; i < num_files; i++) {
if (sys->read(fh, &buf[0], cffile_SIZEOF) != cffile_SIZEOF) {
return MSPACK_ERR_READ;
}
if (!(file = sys->alloc(sys, sizeof(struct mscabd_file)))) {
return MSPACK_ERR_NOMEMORY;
}
file->next = NULL;
file->length = EndGetI32(&buf[cffile_UncompressedSize]);
file->attribs = EndGetI16(&buf[cffile_Attribs]);
file->offset = EndGetI32(&buf[cffile_FolderOffset]);
/* set folder pointer */
x = EndGetI16(&buf[cffile_FolderIndex]);
if (x < cffileCONTINUED_FROM_PREV) {
/* normal folder index; count up to the correct folder. the folder
* pointer will be NULL if folder index is invalid */
struct mscabd_folder *ifol = cab->base.folders;
while (x--) if (ifol) ifol = ifol->next;
file->folder = ifol;
if (!ifol) {
sys->free(file);
D(("invalid folder index"))
return MSPACK_ERR_DATAFORMAT;
}
}
else {
/* either CONTINUED_TO_NEXT, CONTINUED_FROM_PREV or
* CONTINUED_PREV_AND_NEXT */
if ((x == cffileCONTINUED_TO_NEXT) ||
static int cabd_read_headers(struct mspack_system *sys,
struct mspack_file *fh,
struct mscabd_cabinet_p *cab,
off_t offset, int quiet)
{
int num_folders, num_files, folder_resv, i, x;
struct mscabd_folder_p *fol, *linkfol = NULL;
struct mscabd_file *file, *linkfile = NULL;
unsigned char buf[64];
cab->base.next = NULL;
cab->base.files = NULL;
cab->base.folders = NULL;
cab->base.prevcab = cab->base.nextcab = NULL;
cab->base.prevname = cab->base.nextname = NULL;
cab->base.previnfo = cab->base.nextinfo = NULL;
cab->base.base_offset = offset;
if (sys->seek(fh, offset, MSPACK_SYS_SEEK_START)) {
return MSPACK_ERR_SEEK;
}
if (sys->read(fh, &buf[0], cfhead_SIZEOF) != cfhead_SIZEOF) {
return MSPACK_ERR_READ;
}
if (EndGetI32(&buf[cfhead_Signature]) != 0x4643534D) {
return MSPACK_ERR_SIGNATURE;
}
cab->base.length = EndGetI32(&buf[cfhead_CabinetSize]);
cab->base.set_id = EndGetI16(&buf[cfhead_SetID]);
cab->base.set_index = EndGetI16(&buf[cfhead_CabinetIndex]);
num_folders = EndGetI16(&buf[cfhead_NumFolders]);
if (num_folders == 0) {
if (!quiet) sys->message(fh, "no folders in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
num_files = EndGetI16(&buf[cfhead_NumFiles]);
if (num_files == 0) {
if (!quiet) sys->message(fh, "no files in cabinet.");
return MSPACK_ERR_DATAFORMAT;
}
if ((buf[cfhead_MajorVersion] != 1) && (buf[cfhead_MinorVersion] != 3)) {
if (!quiet) sys->message(fh, "WARNING; cabinet version is not 1.3");
}
cab->base.flags = EndGetI16(&buf[cfhead_Flags]);
if (cab->base.flags & cfheadRESERVE_PRESENT) {
if (sys->read(fh, &buf[0], cfheadext_SIZEOF) != cfheadext_SIZEOF) {
return MSPACK_ERR_READ;
}
cab->base.header_resv = EndGetI16(&buf[cfheadext_HeaderReserved]);
folder_resv = buf[cfheadext_FolderReserved];
cab->block_resv = buf[cfheadext_DataReserved];
if (cab->base.header_resv > 60000) {
if (!quiet) sys->message(fh, "WARNING; reserved header > 60000.");
}
if (cab->base.header_resv) {
if (sys->seek(fh, (off_t) cab->base.header_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
}
else {
cab->base.header_resv = 0;
folder_resv = 0;
cab->block_resv = 0;
}
if (cab->base.flags & cfheadPREV_CABINET) {
cab->base.prevname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.previnfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
if (cab->base.flags & cfheadNEXT_CABINET) {
cab->base.nextname = cabd_read_string(sys, fh, cab, &x); if (x) return x;
cab->base.nextinfo = cabd_read_string(sys, fh, cab, &x); if (x) return x;
}
for (i = 0; i < num_folders; i++) {
if (sys->read(fh, &buf[0], cffold_SIZEOF) != cffold_SIZEOF) {
return MSPACK_ERR_READ;
}
if (folder_resv) {
if (sys->seek(fh, (off_t) folder_resv, MSPACK_SYS_SEEK_CUR)) {
return MSPACK_ERR_SEEK;
}
}
if (!(fol = (struct mscabd_folder_p *)sys->alloc(sys, sizeof(struct mscabd_folder_p)))) {
return MSPACK_ERR_NOMEMORY;
}
fol->base.next = NULL;
fol->base.comp_type = EndGetI16(&buf[cffold_CompType]);
fol->base.num_blocks = EndGetI16(&buf[cffold_NumBlocks]);
fol->data.next = NULL;
fol->data.cab = (struct mscabd_cabinet_p *) cab;
fol->data.offset = offset + (off_t)
( (unsigned int) EndGetI32(&buf[cffold_DataOffset]) );
fol->merge_prev = NULL;
fol->merge_next = NULL;
if (!linkfol) cab->base.folders = (struct mscabd_folder *) fol;
else linkfol->base.next = (struct mscabd_folder *) fol;
linkfol = fol;
}
for (i = 0; i < num_files; i++) {
if (sys->read(fh, &buf[0], cffile_SIZEOF) != cffile_SIZEOF) {
return MSPACK_ERR_READ;
}
if (!(file = (struct mscabd_file *)sys->alloc(sys, sizeof(struct mscabd_file)))) {
return MSPACK_ERR_NOMEMORY;
}
file->next = NULL;
file->length = EndGetI32(&buf[cffile_UncompressedSize]);
file->attribs = EndGetI16(&buf[cffile_Attribs]);
file->offset = EndGetI32(&buf[cffile_FolderOffset]);
x = EndGetI16(&buf[cffile_FolderIndex]);
if (x < cffileCONTINUED_FROM_PREV) {
struct mscabd_folder *ifol = cab->base.folders;
while (x--) if (ifol) ifol = ifol->next;
file->folder = ifol;
if (!ifol) {
sys->free(file);
return MSPACK_ERR_DATAFORMAT;
}
}
else {
if ((x == cffileCONTINUED_TO_NEXT) ||
(x == cffileCONTINUED_PREV_AND_NEXT))
{
struct mscabd_folder *ifol = cab->base.folders;
while (ifol->next) ifol = ifol->next;
file->folder = ifol;
fol = (struct mscabd_folder_p *) ifol;
if (!fol->merge_next) fol->merge_next = file;
}
if ((x == cffileCONTINUED_FROM_PREV) ||
(x == cffileCONTINUED_PREV_AND_NEXT))
{
file->folder = cab->base.folders;
fol = (struct mscabd_folder_p *) file->folder;
if (!fol->merge_prev) fol->merge_prev = file;
}
}
x = EndGetI16(&buf[cffile_Time]);
file->time_h = x >> 11;
file->time_m = (x >> 5) & 0x3F;
file->time_s = (x << 1) & 0x3E;
x = EndGetI16(&buf[cffile_Date]);
file->date_d = x & 0x1F;
file->date_m = (x >> 5) & 0xF;
file->date_y = (x >> 9) + 1980;
file->filename = cabd_read_string(sys, fh, cab, &x);
if (x) {
sys->free(file);
return x;
}
if (!linkfile) cab->base.files = file;
else linkfile->next = file;
linkfile = file;
}
return MSPACK_ERR_OK;
}