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add MD5 support

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This commit is contained in:
Josh Coalson
2001-01-12 23:55:11 +00:00
parent 4397b27181
commit fa37f1c012
8 changed files with 81 additions and 7 deletions
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41
src/libFLAC/file_decoder.c
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@@ -23,6 +23,7 @@
#include <string.h> /* for strcmp() */
#include "FLAC/file_decoder.h"
#include "protected/stream_decoder.h"
#include "private/md5.h"
typedef struct FLAC__FileDecoderPrivate {
FLAC__StreamDecoderWriteStatus (*write_callback)(const FLAC__FileDecoder *decoder, const FLAC__FrameHeader *header, const int32 *buffer[], void *client_data);
@@ -31,6 +32,9 @@ typedef struct FLAC__FileDecoderPrivate {
void *client_data;
FILE *file;
FLAC__StreamDecoder *stream;
struct MD5Context md5context;
byte stored_md5sum[16]; /* this is what is stored in the metadata */
byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
/* the rest of these are only used for seeking: */
FLAC__StreamMetaData_Encoding metadata; /* we keep this around so we can figure out how to seek quickly */
FLAC__FrameHeader last_frame_header; /* holds the info of the last frame we seeked to */
@@ -105,6 +109,14 @@ FLAC__FileDecoderState FLAC__file_decoder_init(
if(decoder->guts->file == 0)
return decoder->state = FLAC__FILE_DECODER_ERROR_OPENING_FILE;
/* We initialize the MD5Context even though we may never use it. This is
* because check_md5 may be turned on to start and then turned off if a
* seek occurs. So we always init the context here and finalize it in
* FLAC__file_decoder_finish() to make sure things are always cleaned up
*properly.
*/
MD5Init(&decoder->guts->md5context);
decoder->guts->stream = FLAC__stream_decoder_get_new_instance();
if(FLAC__stream_decoder_init(decoder->guts->stream, read_callback_, write_callback_, metadata_callback_, error_callback_, decoder) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA)
return decoder->state = FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR; /* this is based on internal knowledge of FLAC__stream_decoder_init() */
@@ -112,22 +124,33 @@ FLAC__FileDecoderState FLAC__file_decoder_init(
return decoder->state;
}
void FLAC__file_decoder_finish(FLAC__FileDecoder *decoder)
bool FLAC__file_decoder_finish(FLAC__FileDecoder *decoder)
{
bool md5_failed = false;
assert(decoder != 0);
if(decoder->state == FLAC__FILE_DECODER_UNINITIALIZED)
return;
return true;
if(decoder->guts != 0) {
if(decoder->guts->file != 0 && decoder->guts->file != stdin)
fclose(decoder->guts->file);
/* see the comment in FLAC__file_decoder_init() as to why we always
* call MD5Final()
*/
MD5Final(decoder->guts->computed_md5sum, &decoder->guts->md5context);
if(decoder->guts->stream != 0) {
FLAC__stream_decoder_finish(decoder->guts->stream);
FLAC__stream_decoder_free_instance(decoder->guts->stream);
}
if(decoder->check_md5) {
if(memcmp(decoder->guts->stored_md5sum, decoder->guts->computed_md5sum, 16))
md5_failed = true;
}
free(decoder->guts);
decoder->guts = 0;
}
decoder->state = FLAC__FILE_DECODER_UNINITIALIZED;
return !md5_failed;
}
bool FLAC__file_decoder_process_whole_file(FLAC__FileDecoder *decoder)
@@ -207,6 +230,9 @@ bool FLAC__file_decoder_seek_absolute(FLAC__FileDecoder *decoder, uint64 sample)
decoder->state = FLAC__FILE_DECODER_SEEKING;
/* turn off md5 checking if a seek is attempted */
decoder->check_md5 = false;
if(!FLAC__stream_decoder_reset(decoder->guts->stream)) {
decoder->state = FLAC__FILE_DECODER_STREAM_ERROR;
return false;
@@ -301,6 +327,10 @@ FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decode
}
}
else {
if(file_decoder->check_md5) {
if(!FLAC__MD5Accumulate(&file_decoder->guts->md5context, buffer, header->channels, header->blocksize, (header->bits_per_sample+7) / 8))
return FLAC__STREAM_DECODER_WRITE_ABORT;
}
return file_decoder->guts->write_callback(file_decoder, header, buffer, file_decoder->guts->client_data);
}
}
@@ -310,8 +340,13 @@ void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMe
FLAC__FileDecoder *file_decoder = (FLAC__FileDecoder *)client_data;
(void)decoder;
if(metadata->type == FLAC__METADATA_TYPE_ENCODING)
if(metadata->type == FLAC__METADATA_TYPE_ENCODING) {
file_decoder->guts->metadata = metadata->data.encoding;
/* save the MD5 signature for comparison later */
memcpy(file_decoder->guts->stored_md5sum, metadata->data.encoding.md5sum, 16);
if(0 == memcmp(file_decoder->guts->stored_md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
file_decoder->check_md5 = false;
}
if(file_decoder->state != FLAC__FILE_DECODER_SEEKING)
file_decoder->guts->metadata_callback(file_decoder, metadata, file_decoder->guts->client_data);
}