110 lines
2.7 KiB
C++
110 lines
2.7 KiB
C++
#include <stddef.h>
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#include <string.h>
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#include <assert.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include "file.h"
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namespace file {
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char const * source_path = NULL;
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int source_path_length = 0;
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#ifdef READ_PACK_FILE
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#include "pack.h"
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extern "C" {
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extern uint8_t const _binary_test_pack_start[];
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extern uint8_t const _binary_test_pack_end[];
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extern int const _binary_test_pack_size;
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};
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void const * read_file(const char * r_filename, int * out_size)
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{
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pack::header const * header = (pack::header const *)&_binary_test_pack_start[0];
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assert(header->magic == pack::magic_value);
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ptrdiff_t data = (ptrdiff_t)&_binary_test_pack_start[header->header_size];
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for (unsigned int i = 0; i < header->entry_count; i++) {
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if (strcmp(header->entry[i].filename, r_filename) == 0) {
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*out_size = header->entry[i].size;
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return (void const *)(data + header->entry[i].offset);
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}
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}
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fprintf(stderr, "filename not found in pack file %s\n", r_filename);
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assert(false);
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}
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void free(void const * buf)
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{
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(void)buf;
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}
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#else
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static char const * join_path(char * buf, const char * filename)
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{
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if (filename[0] == '/')
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return filename;
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int filename_length = strlen(filename);
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assert(filename_length + source_path_length + 2 < 1024);
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memcpy(buf, source_path, source_path_length);
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buf[source_path_length] = '/';
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memcpy(&buf[source_path_length + 1], filename, filename_length);
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buf[source_path_length + 1 + filename_length] = 0;
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return buf;
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}
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void const * read_file(const char * r_filename, int * out_size)
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{
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fprintf(stderr, "r_filename: %s\n", r_filename);
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char tmp[1024];
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char const * filename = join_path(tmp, r_filename);
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FILE * f = fopen(filename, "rb");
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if (f == NULL) {
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fprintf(stderr, "fopen(%s): %s\n", filename, strerror(errno));
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return NULL;
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}
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int fseek_end_ret = fseek(f, 0, SEEK_END);
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if (fseek_end_ret < 0) {
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fprintf(stderr, "fseek(%s, SEEK_END): %s\n", filename, strerror(errno));
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return NULL;
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}
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size_t size = ftell(f);
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if (size < 0) {
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fprintf(stderr, "ftell(%s): %s\n", filename, strerror(errno));
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return NULL;
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}
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int fseek_set_ret = fseek(f, 0, SEEK_SET);
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if (fseek_set_ret < 0) {
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fprintf(stderr, "lseek(%s, SEEK_SET): %s\n", filename, strerror(errno));
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return NULL;
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}
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rewind(f);
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void * buf = malloc(size);
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size_t read_size = fread(buf, 1, size, f);
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if (read_size != size) {
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fprintf(stderr, "fread(%s): %s\n", filename, strerror(errno));
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return NULL;
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}
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*out_size = size;
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return buf;
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}
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void free(void const * buf)
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{
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::free((void *)buf);
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}
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#endif
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}
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