80 lines
1.7 KiB
C
Executable File
80 lines
1.7 KiB
C
Executable File
#include <sys/i2ceeprom.h>
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#include <sys/fastfile.h>
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#include <sys/errno.h>
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struct i2cee_fastfile {
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fastfile_t fastfile;
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int32_t offset,
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size,
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position;
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};
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int i2cee_ff_seek (fastfile_t *ff,int position){
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struct i2cee_fastfile *f = (struct i2cee_fastfile*)ff;
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if ((position >= 0) && (position < f->size)){
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f->position = position;
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return ESUCCESS;
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};
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return -ESHORT;
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};
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int i2cee_ff_tell (fastfile_t *ff){
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struct i2cee_fastfile *f = (struct i2cee_fastfile*)ff;
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return f->position;
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};
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int i2cee_ff_read (fastfile_t *ff,void *buffer,int len){
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struct i2cee_fastfile *f = (struct i2cee_fastfile*)ff;
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if (!buffer){
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return -ENULLPTR;
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};
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if (f->position + len > f->size){
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len = f->size - f->position;
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};
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len = i2cee_load( f->offset + f->position, buffer, len );
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assert(len);
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f->position += len;
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return len;
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};
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int i2cee_ff_write (fastfile_t *ff,void *buffer,int len){
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struct i2cee_fastfile *f = (struct i2cee_fastfile*)ff;
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if (!buffer){
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return -ENULLPTR;
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};
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if (f->position + len > f->size){
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len = f->size - f->position;
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};
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len = i2cee_save( f->offset + f->position, buffer, len );
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assert(len);
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f->position += len;
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return len;
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};
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int i2cee_ff_close (fastfile_t *ff){
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return ESUCCESS;
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};
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fastfile_t* i2cee_define_file(int32_t offset,int32_t size){
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struct i2cee_fastfile *f = (struct i2cee_fastfile*)malloc( sizeof( struct i2cee_fastfile) );
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if (!f){
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return NULL;
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};
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memset(f, 0x00, sizeof( *f ) );
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f->fastfile.ops.seek = i2cee_ff_seek;
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f->fastfile.ops.tell = i2cee_ff_tell;
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f->fastfile.ops.read = i2cee_ff_read;
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f->fastfile.ops.write = i2cee_ff_write;
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f->fastfile.ops.close = i2cee_ff_close;
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return & (f->fastfile);
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};
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