circuitpython/teensy/memzip.c

38 lines
1.1 KiB
C

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "memzip.h"
extern uint8_t _staticfs[];
MEMZIP_RESULT memzip_locate(const char *filename, void **data, size_t *len)
{
const MEMZIP_FILE_HDR *file_hdr = (const MEMZIP_FILE_HDR *)_staticfs;
uint8_t *mem_data;
/* Zip file filenames don't have a leading /, so we strip it off */
if (*filename == '/') {
filename++;
}
while (file_hdr->signature == MEMZIP_FILE_HEADER_SIGNATURE) {
const char *file_hdr_filename = (const char *)&file_hdr[1];
mem_data = (uint8_t *)file_hdr_filename;
mem_data += file_hdr->filename_len;
mem_data += file_hdr->extra_len;
if (!strncmp(file_hdr_filename, filename, file_hdr->filename_len)) {
/* We found a match */
if (file_hdr->compression_method != 0) {
return MZ_FILE_COMPRESSED;
}
*data = mem_data;
*len = file_hdr->uncompressed_size;
return MZ_OK;
}
mem_data += file_hdr->uncompressed_size;
file_hdr = (const MEMZIP_FILE_HDR *)mem_data;
}
return MZ_NO_FILE;
}