107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "py/mpconfig.h"
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#include "py/misc.h"
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#include "memzip.h"
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extern uint8_t memzip_data[];
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const MEMZIP_FILE_HDR *memzip_find_file_header(const char *filename) {
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const MEMZIP_FILE_HDR *file_hdr = (const MEMZIP_FILE_HDR *)memzip_data;
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uint8_t *mem_data;
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/* Zip file filenames don't have a leading /, so we strip it off */
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if (*filename == '/') {
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filename++;
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}
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while (file_hdr->signature == MEMZIP_FILE_HEADER_SIGNATURE) {
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const char *file_hdr_filename = (const char *)&file_hdr[1];
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mem_data = (uint8_t *)file_hdr_filename;
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mem_data += file_hdr->filename_len;
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mem_data += file_hdr->extra_len;
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if (!strncmp(file_hdr_filename, filename, file_hdr->filename_len)) {
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/* We found a match */
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return file_hdr;
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}
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mem_data += file_hdr->uncompressed_size;
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file_hdr = (const MEMZIP_FILE_HDR *)mem_data;
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}
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return NULL;
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}
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bool memzip_is_dir(const char *filename) {
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const MEMZIP_FILE_HDR *file_hdr = (const MEMZIP_FILE_HDR *)memzip_data;
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uint8_t *mem_data;
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if (strcmp(filename, "/") == 0) {
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// The root directory is a directory.
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return true;
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}
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// Zip filenames don't have a leading /, so we strip it off
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if (*filename == '/') {
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filename++;
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}
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size_t filename_len = strlen(filename);
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while (file_hdr->signature == MEMZIP_FILE_HEADER_SIGNATURE) {
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const char *file_hdr_filename = (const char *)&file_hdr[1];
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if (filename_len < file_hdr->filename_len &&
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strncmp(file_hdr_filename, filename, filename_len) == 0 &&
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file_hdr_filename[filename_len] == '/') {
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return true;
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}
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mem_data = (uint8_t *)file_hdr_filename;
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mem_data += file_hdr->filename_len;
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mem_data += file_hdr->extra_len;
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mem_data += file_hdr->uncompressed_size;
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file_hdr = (const MEMZIP_FILE_HDR *)mem_data;
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}
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return NULL;
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}
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MEMZIP_RESULT memzip_locate(const char *filename, void **data, size_t *len)
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{
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const MEMZIP_FILE_HDR *file_hdr = memzip_find_file_header(filename);
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if (file_hdr == NULL) {
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return MZ_NO_FILE;
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}
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if (file_hdr->compression_method != 0) {
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return MZ_FILE_COMPRESSED;
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}
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uint8_t *mem_data;
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mem_data = (uint8_t *)&file_hdr[1];
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mem_data += file_hdr->filename_len;
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mem_data += file_hdr->extra_len;
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*data = mem_data;
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*len = file_hdr->uncompressed_size;
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return MZ_OK;
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}
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MEMZIP_RESULT memzip_stat(const char *path, MEMZIP_FILE_INFO *info) {
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const MEMZIP_FILE_HDR *file_hdr = memzip_find_file_header(path);
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if (file_hdr == NULL) {
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if (memzip_is_dir(path)) {
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info->file_size = 0;
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info->last_mod_date = 0;
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info->last_mod_time = 0;
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info->is_dir = 1;
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return MZ_OK;
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}
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return MZ_NO_FILE;
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}
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info->file_size = file_hdr->uncompressed_size;
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info->last_mod_date = file_hdr->last_mod_date;
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info->last_mod_time = file_hdr->last_mod_time;
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info->is_dir = 0;
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return MZ_OK;
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}
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