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https://github.com/libretro/RetroArch
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Merge pull request #7458 from gblues/master
Capture CRC content for deferred-loading cores
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commit
0abb93228e
@ -23,6 +23,8 @@
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#include <stdint.h>
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#include <stddef.h>
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#include <encodings/crc32.h>
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#include <streams/file_stream.h>
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#include <stdlib.h>
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static const uint32_t crc32_table[256] = {
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0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
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@ -88,3 +90,50 @@ uint32_t encoding_crc32(uint32_t crc, const uint8_t *buf, size_t len)
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return crc ^ 0xffffffff;
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}
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#define CRC32_BUFFER_SIZE 1048576
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#define CRC32_MAX_MB 64
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/**
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* Calculate a CRC32 from the first part of the given file.
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* "first part" being the first (CRC32_BUFFER_SIZE * CRC32_MAX_MB)
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* bytes.
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*
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* Returns: the crc32, or 0 if there was an error.
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*/
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uint32_t file_crc32(uint32_t crc, const char *path) {
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if(path == NULL)
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return 0;
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RFILE *file = NULL;
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unsigned char *buf = NULL;
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int i, nread;
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file = filestream_open(path, RETRO_VFS_FILE_ACCESS_READ, 0);
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if(file == NULL)
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goto error;
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buf = (char *)malloc(CRC32_BUFFER_SIZE);
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if(buf == NULL)
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goto error;
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for(i = 0; i < CRC32_MAX_MB; i++) {
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nread = filestream_read(file, buf, CRC32_BUFFER_SIZE);
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if(nread < 0)
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goto error;
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crc = encoding_crc32(crc, buf, nread);
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if(filestream_eof(file))
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break;
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}
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free(buf);
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filestream_close(file);
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return crc;
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error:
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if(buf)
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free(buf);
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if(file)
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filestream_close(file);
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return 0;
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}
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@ -31,6 +31,7 @@
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RETRO_BEGIN_DECLS
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uint32_t encoding_crc32(uint32_t crc, const uint8_t *buf, size_t len);
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uint32_t file_crc32(uint32_t crc, const char *path);
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RETRO_END_DECLS
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@ -482,7 +482,8 @@ int filestream_close(RFILE *stream)
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*
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* Read the contents of a file into @buf.
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*
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* Returns: number of items read, -1 on error.
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* Returns: 1 on success, 0 on failure
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* In the error case, the dereferenced buf is set to NULL and the len is set to -1.
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*/
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int64_t filestream_read_file(const char *path, void **buf, int64_t *len)
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{
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@ -603,9 +603,6 @@ static bool content_file_load(
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}
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else
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{
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RARCH_LOG("%s\n",
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msg_hash_to_str(
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MSG_CONTENT_LOADING_SKIPPED_IMPLEMENTATION_WILL_DO_IT));
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#ifdef HAVE_COMPRESSION
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if ( !content_ctx->block_extract
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@ -619,6 +616,9 @@ static bool content_file_load(
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goto error;
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#endif
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}
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RARCH_LOG("%s\n", msg_hash_to_str(MSG_CONTENT_LOADING_SKIPPED_IMPLEMENTATION_WILL_DO_IT));
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content_rom_crc = file_crc32(0, path);
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RARCH_LOG("CRC32: 0x%x .\n", (unsigned)content_rom_crc);
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}
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load_info.content = content;
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