diff options
Diffstat (limited to 'vcs-svn')
| -rw-r--r-- | vcs-svn/svndiff.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/vcs-svn/svndiff.c b/vcs-svn/svndiff.c index fb7dc22f9..a02eee041 100644 --- a/vcs-svn/svndiff.c +++ b/vcs-svn/svndiff.c @@ -21,7 +21,12 @@ * | packed_view_selector int * | packed_copyfrom_data * ; + * view_selector ::= copyfrom_source + * | copyfrom_target + * ; + * copyfrom_target ::= # binary 01 000000; * copyfrom_data ::= # binary 10 000000; + * packed_view_selector ::= # view_selector OR-ed with 6 bit value; * packed_copyfrom_data ::= # copyfrom_data OR-ed with 6 bit value; * int ::= highdigit* lowdigit; * highdigit ::= # binary 1000 0000 OR-ed with 7 bit value; @@ -29,6 +34,7 @@ */ #define INSN_MASK 0xc0 +#define INSN_COPYFROM_TARGET 0x40 #define INSN_COPYFROM_DATA 0x80 #define OPERAND_MASK 0x3f @@ -155,6 +161,19 @@ static int read_length(struct line_buffer *in, size_t *result, off_t *len) return 0; } +static int copyfrom_target(struct window *ctx, const char **instructions, + size_t nbytes, const char *instructions_end) +{ + size_t offset; + if (parse_int(instructions, &offset, instructions_end)) + return -1; + if (offset >= ctx->out.len) + return error("invalid delta: copies from the future"); + for (; nbytes > 0; nbytes--) + strbuf_addch(&ctx->out, ctx->out.buf[offset++]); + return 0; +} + static int copyfrom_data(struct window *ctx, size_t *data_pos, size_t nbytes) { const size_t pos = *data_pos; @@ -189,9 +208,14 @@ static int execute_one_instruction(struct window *ctx, instruction = (unsigned char) **instructions; if (parse_first_operand(instructions, &nbytes, insns_end)) return -1; - if ((instruction & INSN_MASK) != INSN_COPYFROM_DATA) + switch (instruction & INSN_MASK) { + case INSN_COPYFROM_TARGET: + return copyfrom_target(ctx, instructions, nbytes, insns_end); + case INSN_COPYFROM_DATA: + return copyfrom_data(ctx, data_pos, nbytes); + default: return error("Unknown instruction %x", instruction); - return copyfrom_data(ctx, data_pos, nbytes); + } } static int apply_window_in_core(struct window *ctx) |