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83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
#ifndef _BAR_STREAMFILE_H_
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#define _BAR_STREAMFILE_H_
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#include "../streamfile.h"
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/* a streamfile wrapping another for decryption */
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enum {BAR_KEY_LENGTH = 16};
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// don't know if this is unique, but seems accurate
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static const uint8_t bar_key[BAR_KEY_LENGTH] = {
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0xbd,0x14,0x0e,0x0a,0x91,0xeb,0xaa,0xf6,
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0x11,0x44,0x17,0xc2,0x1c,0xe4,0x66,0x80
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};
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typedef struct _BARSTREAMFILE {
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STREAMFILE sf;
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STREAMFILE *real_file;
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} BARSTREAMFILE;
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/*static*/ STREAMFILE *wrap_bar_STREAMFILE(STREAMFILE *file);
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static size_t read_bar(BARSTREAMFILE *streamFile, uint8_t *dest, off_t offset, size_t length) {
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off_t i;
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size_t read_length = streamFile->real_file->read(streamFile->real_file, dest, offset, length);
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for (i = 0; i < read_length; i++) {
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dest[i] = dest[i] ^ bar_key[(i+offset)%BAR_KEY_LENGTH];
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}
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return read_length;
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}
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static size_t get_size_bar(BARSTREAMFILE *streamFile) {
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return streamFile->real_file->get_size(streamFile->real_file);
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}
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static size_t get_offset_bar(BARSTREAMFILE *streamFile) {
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return streamFile->real_file->get_offset(streamFile->real_file);
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}
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static void get_name_bar(BARSTREAMFILE *streamFile, char *name, size_t length) {
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streamFile->real_file->get_name(streamFile->real_file, name, length);
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}
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static STREAMFILE *open_bar(BARSTREAMFILE *streamFile, const char * const filename, size_t buffersize) {
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STREAMFILE *newfile = streamFile->real_file->open(streamFile->real_file,filename,buffersize);
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if (!newfile)
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return NULL;
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return wrap_bar_STREAMFILE(newfile);
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}
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static void close_bar(BARSTREAMFILE *streamFile) {
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streamFile->real_file->close(streamFile->real_file);
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free(streamFile);
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return;
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}
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/*static*/ STREAMFILE *wrap_bar_STREAMFILE(STREAMFILE *file) {
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BARSTREAMFILE *streamfile = malloc(sizeof(BARSTREAMFILE));
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if (!streamfile)
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return NULL;
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memset(streamfile, 0, sizeof(BARSTREAMFILE));
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streamfile->sf.read = (void*)read_bar;
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streamfile->sf.get_size = (void*)get_size_bar;
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streamfile->sf.get_offset = (void*)get_offset_bar;
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streamfile->sf.get_name = (void*)get_name_bar;
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streamfile->sf.open = (void*)open_bar;
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streamfile->sf.close = (void*)close_bar;
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streamfile->real_file = file;
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return &streamfile->sf;
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}
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#endif /* _BAR_STREAMFILE_H_ */
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